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Posted to notifications@james.apache.org by bt...@apache.org on 2021/02/04 05:02:39 UTC

[james-project] 13/18: JAMES-3498 Restore static imports

This is an automated email from the ASF dual-hosted git repository.

btellier pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/james-project.git

commit cfce689fcd2e55e59e689f78dbd10218ef82a2b3
Author: Benoit Tellier <bt...@linagora.com>
AuthorDate: Mon Jan 25 18:58:43 2021 +0700

    JAMES-3498 Restore static imports
---
 .../events/EventBusConcurrentTestContract.java     | 131 +++++++------
 .../org/apache/james/events/EventBusContract.java  |  16 +-
 .../james/events/EventDeadLettersContract.java     |  51 ++---
 .../EventDeadLettersHealthCheckContract.java       |   7 +-
 .../org/apache/james/events/GroupContract.java     | 184 +++++++++---------
 .../java/org/apache/james/events/KeyContract.java  | 206 +++++++++++----------
 .../james/events/CassandraEventDeadLettersDAO.java |  57 +++---
 .../events/CassandraEventDeadLettersGroupDAO.java  |  15 +-
 .../events/CassandraEventDeadLettersDAOTest.java   |  57 +++---
 .../CassandraEventDeadLettersGroupDAOTest.java     |   8 +-
 .../apache/james/events/GroupConsumerRetry.java    |   3 +-
 .../org/apache/james/events/GroupRegistration.java |   3 +-
 .../james/events/KeyReconnectionHandler.java       |   4 +-
 .../events/delivery/InVmEventDeliveryTest.java     |  90 ++++-----
 14 files changed, 441 insertions(+), 391 deletions(-)

diff --git a/event-bus/api/src/test/java/org/apache/james/events/EventBusConcurrentTestContract.java b/event-bus/api/src/test/java/org/apache/james/events/EventBusConcurrentTestContract.java
index 6648458..8905df3 100644
--- a/event-bus/api/src/test/java/org/apache/james/events/EventBusConcurrentTestContract.java
+++ b/event-bus/api/src/test/java/org/apache/james/events/EventBusConcurrentTestContract.java
@@ -19,6 +19,11 @@
 
 package org.apache.james.events;
 
+import static org.apache.james.events.EventBusTestFixture.EVENT;
+import static org.apache.james.events.EventBusTestFixture.KEY_1;
+import static org.apache.james.events.EventBusTestFixture.KEY_2;
+import static org.apache.james.events.EventBusTestFixture.KEY_3;
+import static org.apache.james.events.EventBusTestFixture.NO_KEYS;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.awaitility.Awaitility.await;
 
@@ -26,6 +31,10 @@ import java.time.Duration;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
+import org.apache.james.events.EventBusTestFixture.EventListenerCountingSuccessfulExecution;
+import org.apache.james.events.EventBusTestFixture.GroupA;
+import org.apache.james.events.EventBusTestFixture.GroupB;
+import org.apache.james.events.EventBusTestFixture.GroupC;
 import org.apache.james.util.concurrency.ConcurrentTestRunner;
 import org.awaitility.core.ConditionFactory;
 import org.junit.jupiter.api.Test;
@@ -44,15 +53,15 @@ public interface EventBusConcurrentTestContract {
     int OPERATION_COUNT = 30;
     int TOTAL_DISPATCH_OPERATIONS = THREAD_COUNT * OPERATION_COUNT;
 
-    Set<RegistrationKey> ALL_KEYS = ImmutableSet.of(EventBusTestFixture.KEY_1, EventBusTestFixture.KEY_2, EventBusTestFixture.KEY_3);
+    Set<RegistrationKey> ALL_KEYS = ImmutableSet.of(KEY_1, KEY_2, KEY_3);
 
-    static EventBusTestFixture.EventListenerCountingSuccessfulExecution newCountingListener() {
-        return new EventBusTestFixture.EventListenerCountingSuccessfulExecution();
+    static EventListenerCountingSuccessfulExecution newCountingListener() {
+        return new EventListenerCountingSuccessfulExecution();
     }
 
-    static int totalEventsReceived(ImmutableList<EventBusTestFixture.EventListenerCountingSuccessfulExecution> allListeners) {
+    static int totalEventsReceived(ImmutableList<EventListenerCountingSuccessfulExecution> allListeners) {
         return allListeners.stream()
-            .mapToInt(EventBusTestFixture.EventListenerCountingSuccessfulExecution::numberOfEventCalls)
+            .mapToInt(EventListenerCountingSuccessfulExecution::numberOfEventCalls)
             .sum();
     }
 
@@ -60,17 +69,17 @@ public interface EventBusConcurrentTestContract {
 
         @Test
         default void concurrentDispatchGroupShouldDeliverAllEventsToListenersWithSingleEventBus() throws Exception {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
 
-            eventBus().register(countingListener1, new EventBusTestFixture.GroupA());
-            eventBus().register(countingListener2, new EventBusTestFixture.GroupB());
-            eventBus().register(countingListener3, new EventBusTestFixture.GroupC());
+            eventBus().register(countingListener1, new GroupA());
+            eventBus().register(countingListener2, new GroupB());
+            eventBus().register(countingListener3, new GroupC());
             int totalGlobalRegistrations = 3; // GroupA + GroupB + GroupC
 
             ConcurrentTestRunner.builder()
-                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block())
+                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EVENT, NO_KEYS).block())
                 .threadCount(THREAD_COUNT)
                 .operationCount(OPERATION_COUNT)
                 .runSuccessfullyWithin(FIVE_SECONDS);
@@ -82,18 +91,18 @@ public interface EventBusConcurrentTestContract {
 
         @Test
         default void concurrentDispatchKeyShouldDeliverAllEventsToListenersWithSingleEventBus() throws Exception {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
-            Mono.from(eventBus().register(countingListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(countingListener2, EventBusTestFixture.KEY_2)).block();
-            Mono.from(eventBus().register(countingListener3, EventBusTestFixture.KEY_3)).block();
+            EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
+            Mono.from(eventBus().register(countingListener1, KEY_1)).block();
+            Mono.from(eventBus().register(countingListener2, KEY_2)).block();
+            Mono.from(eventBus().register(countingListener3, KEY_3)).block();
 
             int totalKeyListenerRegistrations = 3; // KEY1 + KEY2 + KEY3
             int totalEventBus = 1;
 
             ConcurrentTestRunner.builder()
-                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EventBusTestFixture.EVENT, ALL_KEYS).block())
+                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EVENT, ALL_KEYS).block())
                 .threadCount(THREAD_COUNT)
                 .operationCount(OPERATION_COUNT)
                 .runSuccessfullyWithin(FIVE_SECONDS);
@@ -105,25 +114,25 @@ public interface EventBusConcurrentTestContract {
 
         @Test
         default void concurrentDispatchShouldDeliverAllEventsToListenersWithSingleEventBus() throws Exception {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
 
-            eventBus().register(countingListener1, new EventBusTestFixture.GroupA());
-            eventBus().register(countingListener2, new EventBusTestFixture.GroupB());
-            eventBus().register(countingListener3, new EventBusTestFixture.GroupC());
+            eventBus().register(countingListener1, new GroupA());
+            eventBus().register(countingListener2, new GroupB());
+            eventBus().register(countingListener3, new GroupC());
 
             int totalGlobalRegistrations = 3; // GroupA + GroupB + GroupC
             int totalEventDeliveredGlobally = totalGlobalRegistrations * TOTAL_DISPATCH_OPERATIONS;
 
-            Mono.from(eventBus().register(countingListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(countingListener2, EventBusTestFixture.KEY_2)).block();
-            Mono.from(eventBus().register(countingListener3, EventBusTestFixture.KEY_3)).block();
+            Mono.from(eventBus().register(countingListener1, KEY_1)).block();
+            Mono.from(eventBus().register(countingListener2, KEY_2)).block();
+            Mono.from(eventBus().register(countingListener3, KEY_3)).block();
             int totalKeyListenerRegistrations = 3; // KEY1 + KEY2 + KEY3
             int totalEventDeliveredByKeys = totalKeyListenerRegistrations * TOTAL_DISPATCH_OPERATIONS;
 
             ConcurrentTestRunner.builder()
-                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EventBusTestFixture.EVENT, ALL_KEYS).block())
+                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EVENT, ALL_KEYS).block())
                 .threadCount(THREAD_COUNT)
                 .operationCount(OPERATION_COUNT)
                 .runSuccessfullyWithin(FIVE_SECONDS);
@@ -140,22 +149,22 @@ public interface EventBusConcurrentTestContract {
 
         @Test
         default void concurrentDispatchGroupShouldDeliverAllEventsToListenersWithMultipleEventBus() throws Exception {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
 
-            eventBus().register(countingListener1, new EventBusTestFixture.GroupA());
-            eventBus().register(countingListener2, new EventBusTestFixture.GroupB());
-            eventBus().register(countingListener3, new EventBusTestFixture.GroupC());
+            eventBus().register(countingListener1, new GroupA());
+            eventBus().register(countingListener2, new GroupB());
+            eventBus().register(countingListener3, new GroupC());
 
-            eventBus2().register(countingListener1, new EventBusTestFixture.GroupA());
-            eventBus2().register(countingListener2, new EventBusTestFixture.GroupB());
-            eventBus2().register(countingListener3, new EventBusTestFixture.GroupC());
+            eventBus2().register(countingListener1, new GroupA());
+            eventBus2().register(countingListener2, new GroupB());
+            eventBus2().register(countingListener3, new GroupC());
 
             int totalGlobalRegistrations = 3; // GroupA + GroupB + GroupC
 
             ConcurrentTestRunner.builder()
-                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block())
+                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EVENT, NO_KEYS).block())
                 .threadCount(THREAD_COUNT)
                 .operationCount(OPERATION_COUNT)
                 .runSuccessfullyWithin(FIVE_SECONDS);
@@ -167,23 +176,23 @@ public interface EventBusConcurrentTestContract {
 
         @Test
         default void concurrentDispatchKeyShouldDeliverAllEventsToListenersWithMultipleEventBus() throws Exception {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
 
-            Mono.from(eventBus().register(countingListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(countingListener2, EventBusTestFixture.KEY_2)).block();
-            Mono.from(eventBus().register(countingListener3, EventBusTestFixture.KEY_3)).block();
+            Mono.from(eventBus().register(countingListener1, KEY_1)).block();
+            Mono.from(eventBus().register(countingListener2, KEY_2)).block();
+            Mono.from(eventBus().register(countingListener3, KEY_3)).block();
 
-            Mono.from(eventBus2().register(countingListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus2().register(countingListener2, EventBusTestFixture.KEY_2)).block();
-            Mono.from(eventBus2().register(countingListener3, EventBusTestFixture.KEY_3)).block();
+            Mono.from(eventBus2().register(countingListener1, KEY_1)).block();
+            Mono.from(eventBus2().register(countingListener2, KEY_2)).block();
+            Mono.from(eventBus2().register(countingListener3, KEY_3)).block();
 
             int totalKeyListenerRegistrations = 3; // KEY1 + KEY2 + KEY3
             int totalEventBus = 2; // eventBus1 + eventBus2
 
             ConcurrentTestRunner.builder()
-                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EventBusTestFixture.EVENT, ALL_KEYS).block())
+                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EVENT, ALL_KEYS).block())
                 .threadCount(THREAD_COUNT)
                 .operationCount(OPERATION_COUNT)
                 .runSuccessfullyWithin(FIVE_SECONDS);
@@ -195,31 +204,31 @@ public interface EventBusConcurrentTestContract {
 
         @Test
         default void concurrentDispatchShouldDeliverAllEventsToListenersWithMultipleEventBus() throws Exception {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener1 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener2 = newCountingListener();
+            EventListenerCountingSuccessfulExecution countingListener3 = newCountingListener();
 
             eventBus2().register(countingListener1, EventDeadLettersContract.GROUP_A);
-            eventBus2().register(countingListener2, new EventBusTestFixture.GroupB());
-            eventBus2().register(countingListener3, new EventBusTestFixture.GroupC());
+            eventBus2().register(countingListener2, new GroupB());
+            eventBus2().register(countingListener3, new GroupC());
             int totalGlobalRegistrations = 3; // GroupA + GroupB + GroupC
             int totalEventDeliveredGlobally = totalGlobalRegistrations * TOTAL_DISPATCH_OPERATIONS;
 
-            Mono.from(eventBus().register(countingListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(countingListener2, EventBusTestFixture.KEY_2)).block();
+            Mono.from(eventBus().register(countingListener1, KEY_1)).block();
+            Mono.from(eventBus().register(countingListener2, KEY_2)).block();
 
-            Mono.from(eventBus2().register(countingListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus2().register(countingListener2, EventBusTestFixture.KEY_2)).block();
+            Mono.from(eventBus2().register(countingListener1, KEY_1)).block();
+            Mono.from(eventBus2().register(countingListener2, KEY_2)).block();
 
-            Mono.from(eventBus3().register(countingListener3, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus3().register(countingListener3, EventBusTestFixture.KEY_2)).block();
+            Mono.from(eventBus3().register(countingListener3, KEY_1)).block();
+            Mono.from(eventBus3().register(countingListener3, KEY_2)).block();
 
             int totalKeyListenerRegistrations = 2; // KEY1 + KEY2
             int totalEventBus = 3; // eventBus1 + eventBus2 + eventBus3
             int totalEventDeliveredByKeys = totalKeyListenerRegistrations * totalEventBus * TOTAL_DISPATCH_OPERATIONS;
 
             ConcurrentTestRunner.builder()
-                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EventBusTestFixture.EVENT, ALL_KEYS).block())
+                .operation((threadNumber, operationNumber) -> eventBus().dispatch(EVENT, ALL_KEYS).block())
                 .threadCount(THREAD_COUNT)
                 .operationCount(OPERATION_COUNT)
                 .runSuccessfullyWithin(FIVE_SECONDS);
diff --git a/event-bus/api/src/test/java/org/apache/james/events/EventBusContract.java b/event-bus/api/src/test/java/org/apache/james/events/EventBusContract.java
index c1b52f9..d439d9c 100644
--- a/event-bus/api/src/test/java/org/apache/james/events/EventBusContract.java
+++ b/event-bus/api/src/test/java/org/apache/james/events/EventBusContract.java
@@ -19,10 +19,12 @@
 
 package org.apache.james.events;
 
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.awaitility.Awaitility.await;
+import static org.awaitility.Duration.ONE_HUNDRED_MILLISECONDS;
+import static org.awaitility.Duration.ZERO;
 
 import java.time.Duration;
-import java.util.concurrent.TimeUnit;
 
 import org.awaitility.core.ConditionFactory;
 
@@ -49,15 +51,15 @@ public interface EventBusContract {
         }
 
         public ConditionFactory shortWaitCondition() {
-            return await().pollDelay(org.awaitility.Duration.ZERO)
-                .pollInterval(org.awaitility.Duration.ONE_HUNDRED_MILLISECONDS)
-                .timeout(new org.awaitility.Duration(this.getShortWaitTime().toMillis(), TimeUnit.MILLISECONDS));
+            return await().pollDelay(ZERO)
+                .pollInterval(ONE_HUNDRED_MILLISECONDS)
+                .timeout(new org.awaitility.Duration(this.getShortWaitTime().toMillis(), MILLISECONDS));
         }
 
         public ConditionFactory longWaitCondition() {
-            return await().pollDelay(org.awaitility.Duration.ZERO)
-                .pollInterval(org.awaitility.Duration.ONE_HUNDRED_MILLISECONDS)
-                .timeout(new org.awaitility.Duration(this.getLongWaitTime().toMillis(), TimeUnit.MILLISECONDS));
+            return await().pollDelay(ZERO)
+                .pollInterval(ONE_HUNDRED_MILLISECONDS)
+                .timeout(new org.awaitility.Duration(this.getLongWaitTime().toMillis(), MILLISECONDS));
         }
     }
 
diff --git a/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersContract.java b/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersContract.java
index e351e26..20f0d56 100644
--- a/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersContract.java
+++ b/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersContract.java
@@ -32,6 +32,7 @@ import java.util.stream.Stream;
 
 import org.apache.james.core.Username;
 import org.apache.james.events.EventBusTestFixture.TestEvent;
+import org.apache.james.events.EventDeadLetters.InsertionId;
 import org.apache.james.util.concurrency.ConcurrentTestRunner;
 import org.junit.jupiter.api.Test;
 
@@ -107,19 +108,19 @@ interface EventDeadLettersContract {
     Event EVENT_1 = new TestEvent(EVENT_ID_1, USERNAME);
     Event EVENT_2 = new TestEvent(EVENT_ID_2, USERNAME);
     Event EVENT_3 = new TestEvent(EVENT_ID_3, USERNAME);
-    EventDeadLetters.InsertionId INSERTION_ID_1 = EventDeadLetters.InsertionId.of("6e0dd59d-660e-4d9b-b22f-0354479f47b7");
-    EventDeadLetters.InsertionId INSERTION_ID_2 = EventDeadLetters.InsertionId.of("6e0dd59d-660e-4d9b-b22f-0354479f47b8");
-    EventDeadLetters.InsertionId INSERTION_ID_3 = EventDeadLetters.InsertionId.of("6e0dd59d-660e-4d9b-b22f-0354479f47b9");
+    InsertionId INSERTION_ID_1 = InsertionId.of("6e0dd59d-660e-4d9b-b22f-0354479f47b7");
+    InsertionId INSERTION_ID_2 = InsertionId.of("6e0dd59d-660e-4d9b-b22f-0354479f47b8");
+    InsertionId INSERTION_ID_3 = InsertionId.of("6e0dd59d-660e-4d9b-b22f-0354479f47b9");
 
     Group GROUP_A = new EventBusTestFixture.GroupA();
     Group GROUP_B = new EventBusTestFixture.GroupB();
     Group NULL_GROUP = null;
     Event NULL_EVENT = null;
-    EventDeadLetters.InsertionId NULL_INSERTION_ID = null;
+    InsertionId NULL_INSERTION_ID = null;
 
     EventDeadLetters eventDeadLetters();
 
-    default Stream<EventDeadLetters.InsertionId> allInsertionIds() {
+    default Stream<InsertionId> allInsertionIds() {
         EventDeadLetters eventDeadLetters = eventDeadLetters();
 
         return eventDeadLetters.groupsWithFailedEvents()
@@ -157,7 +158,7 @@ interface EventDeadLettersContract {
         default void storeShouldStoreGroupWithCorrespondingEvent() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
-            EventDeadLetters.InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
             assertThat(eventDeadLetters.failedEvent(GROUP_A, insertionId).block())
                 .isEqualTo(EVENT_1);
         }
@@ -167,12 +168,12 @@ interface EventDeadLettersContract {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
             ImmutableMap<Integer, Group> groups = concurrentGroups();
-            Multimap<Integer, EventDeadLetters.InsertionId> storedInsertionIds = Multimaps.synchronizedSetMultimap(HashMultimap.create());
+            Multimap<Integer, InsertionId> storedInsertionIds = Multimaps.synchronizedSetMultimap(HashMultimap.create());
 
             ConcurrentTestRunner.builder()
                 .operation((threadNumber, step) -> {
                     Event.EventId eventId = Event.EventId.random();
-                    EventDeadLetters.InsertionId insertionId = eventDeadLetters.store(groups.get(threadNumber), event(eventId)).block();
+                    InsertionId insertionId = eventDeadLetters.store(groups.get(threadNumber), event(eventId)).block();
                     storedInsertionIds.put(threadNumber, insertionId);
                 })
                 .threadCount(THREAD_COUNT)
@@ -230,9 +231,9 @@ interface EventDeadLettersContract {
         default void removeShouldKeepNonMatched() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
-            EventDeadLetters.InsertionId insertionId1 = eventDeadLetters.store(GROUP_A, EVENT_1).block();
-            EventDeadLetters.InsertionId insertionId2 = eventDeadLetters.store(GROUP_A, EVENT_2).block();
-            EventDeadLetters.InsertionId insertionId3 = eventDeadLetters.store(GROUP_A, EVENT_3).block();
+            InsertionId insertionId1 = eventDeadLetters.store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId2 = eventDeadLetters.store(GROUP_A, EVENT_2).block();
+            InsertionId insertionId3 = eventDeadLetters.store(GROUP_A, EVENT_3).block();
 
             eventDeadLetters.remove(GROUP_A, insertionId1).block();
 
@@ -265,13 +266,13 @@ interface EventDeadLettersContract {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
             ImmutableMap<Integer, Group> groups = concurrentGroups();
-            ConcurrentHashMap<Integer, EventDeadLetters.InsertionId> storedInsertionIds = new ConcurrentHashMap<>();
+            ConcurrentHashMap<Integer, InsertionId> storedInsertionIds = new ConcurrentHashMap<>();
 
             ConcurrentTestRunner.builder()
                 .operation((threadNumber, step) -> {
                     int operationIndex = threadNumber * OPERATION_COUNT + step;
                     Event.EventId eventId = Event.EventId.random();
-                    EventDeadLetters.InsertionId insertionId = eventDeadLetters.store(groups.get(threadNumber), event(eventId)).block();
+                    InsertionId insertionId = eventDeadLetters.store(groups.get(threadNumber), event(eventId)).block();
                     storedInsertionIds.put(operationIndex, insertionId);
                 })
                 .threadCount(THREAD_COUNT)
@@ -334,7 +335,7 @@ interface EventDeadLettersContract {
         default void failedEventShouldReturnEventWhenContains() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
-            EventDeadLetters.InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
             eventDeadLetters.store(GROUP_A, EVENT_2).block();
 
             assertThat(eventDeadLetters.failedEvent(GROUP_A, insertionId).block())
@@ -345,9 +346,9 @@ interface EventDeadLettersContract {
         default void failedEventShouldNotRemoveEvent() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
-            EventDeadLetters.InsertionId insertionId1 = eventDeadLetters.store(GROUP_A, EVENT_1).block();
-            EventDeadLetters.InsertionId insertionId2 = eventDeadLetters.store(GROUP_A, EVENT_2).block();
-            EventDeadLetters.InsertionId insertionId3 = eventDeadLetters.store(GROUP_A, EVENT_3).block();
+            InsertionId insertionId1 = eventDeadLetters.store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId2 = eventDeadLetters.store(GROUP_A, EVENT_2).block();
+            InsertionId insertionId3 = eventDeadLetters.store(GROUP_A, EVENT_3).block();
 
             eventDeadLetters.failedEvent(GROUP_A, insertionId1).block();
 
@@ -359,7 +360,7 @@ interface EventDeadLettersContract {
         default void failedEventShouldNotThrowWhenNoGroupMatched() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
-            EventDeadLetters.InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
 
             assertThatCode(() -> eventDeadLetters.failedEvent(GROUP_B, insertionId).block())
                 .doesNotThrowAnyException();
@@ -392,7 +393,7 @@ interface EventDeadLettersContract {
         default void failedEventsByGroupShouldReturnAllEventsCorrespondingToGivenGroup() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
-            EventDeadLetters.InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId = eventDeadLetters.store(GROUP_A, EVENT_1).block();
             eventDeadLetters.store(GROUP_B, EVENT_2).block();
             eventDeadLetters.store(GROUP_B, EVENT_3).block();
 
@@ -404,9 +405,9 @@ interface EventDeadLettersContract {
         default void failedEventsByGroupShouldNotRemoveEvents() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
 
-            EventDeadLetters.InsertionId insertionId1 = eventDeadLetters.store(GROUP_A, EVENT_1).block();
-            EventDeadLetters.InsertionId insertionId2 = eventDeadLetters.store(GROUP_A, EVENT_2).block();
-            EventDeadLetters.InsertionId insertionId3 = eventDeadLetters.store(GROUP_B, EVENT_3).block();
+            InsertionId insertionId1 = eventDeadLetters.store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId2 = eventDeadLetters.store(GROUP_A, EVENT_2).block();
+            InsertionId insertionId3 = eventDeadLetters.store(GROUP_B, EVENT_3).block();
 
             eventDeadLetters.failedIds(GROUP_A).toStream();
 
@@ -453,8 +454,8 @@ interface EventDeadLettersContract {
         @Test
         default void containEventsShouldReturnFalseWhenRemoveAllStoredEvents() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
-            EventDeadLetters.InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
-            EventDeadLetters.InsertionId insertionId2 = eventDeadLetters().store(GROUP_A, EVENT_2).block();
+            InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId2 = eventDeadLetters().store(GROUP_A, EVENT_2).block();
 
             assertThat(eventDeadLetters.containEvents().block()).isTrue();
 
@@ -467,7 +468,7 @@ interface EventDeadLettersContract {
         @Test
         default void containEventsShouldReturnTrueWhenRemoveSomeStoredEvents() {
             EventDeadLetters eventDeadLetters = eventDeadLetters();
-            EventDeadLetters.InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
+            InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
             eventDeadLetters().store(GROUP_B, EVENT_2).block();
 
             assertThat(eventDeadLetters.containEvents().block()).isTrue();
diff --git a/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersHealthCheckContract.java b/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersHealthCheckContract.java
index 335f1c7..fd1bb22 100644
--- a/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersHealthCheckContract.java
+++ b/event-bus/api/src/test/java/org/apache/james/events/EventDeadLettersHealthCheckContract.java
@@ -25,6 +25,7 @@ import org.apache.james.core.Username;
 import org.apache.james.core.healthcheck.ComponentName;
 import org.apache.james.core.healthcheck.Result;
 import org.apache.james.events.EventBusTestFixture.TestEvent;
+import org.apache.james.events.EventDeadLetters.InsertionId;
 import org.junit.jupiter.api.Test;
 
 interface EventDeadLettersHealthCheckContract {
@@ -78,8 +79,8 @@ interface EventDeadLettersHealthCheckContract {
 
     @Test
     default void checkShouldReturnHealthyWhenRemovedAllEventDeadLetters() {
-        EventDeadLetters.InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
-        EventDeadLetters.InsertionId insertionId2 = eventDeadLetters().store(GROUP_B, EVENT_2).block();
+        InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
+        InsertionId insertionId2 = eventDeadLetters().store(GROUP_B, EVENT_2).block();
 
         assertThat(testee().check().block().isDegraded()).isTrue();
         assertThat(testee().check().block())
@@ -95,7 +96,7 @@ interface EventDeadLettersHealthCheckContract {
 
     @Test
     default void checkShouldReturnDegradedWhenRemovedSomeEventDeadLetters() {
-        EventDeadLetters.InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
+        InsertionId insertionId1 = eventDeadLetters().store(GROUP_A, EVENT_1).block();
         eventDeadLetters().store(GROUP_B, EVENT_2).block();
 
         assertThat(testee().check().block().isDegraded()).isTrue();
diff --git a/event-bus/api/src/test/java/org/apache/james/events/GroupContract.java b/event-bus/api/src/test/java/org/apache/james/events/GroupContract.java
index 246f6b7..db42ff7 100644
--- a/event-bus/api/src/test/java/org/apache/james/events/GroupContract.java
+++ b/event-bus/api/src/test/java/org/apache/james/events/GroupContract.java
@@ -19,7 +19,15 @@
 
 package org.apache.james.events;
 
+import static org.apache.james.events.EventBusTestFixture.EVENT;
+import static org.apache.james.events.EventBusTestFixture.EVENT_2;
 import static org.apache.james.events.EventBusTestFixture.EVENT_ID;
+import static org.apache.james.events.EventBusTestFixture.EVENT_UNSUPPORTED_BY_LISTENER;
+import static org.apache.james.events.EventBusTestFixture.FIVE_HUNDRED_MS;
+import static org.apache.james.events.EventBusTestFixture.GROUP_A;
+import static org.apache.james.events.EventBusTestFixture.GROUP_B;
+import static org.apache.james.events.EventBusTestFixture.NO_KEYS;
+import static org.apache.james.events.EventBusTestFixture.ONE_SECOND;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
@@ -79,10 +87,10 @@ public interface GroupContract {
                     finishedExecutions.incrementAndGet();
 
                 }
-            }, EventBusTestFixture.GROUP_A);
+            }, GROUP_A);
 
             IntStream.range(0, eventCount)
-                .forEach(i -> eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block());
+                .forEach(i -> eventBus().dispatch(EVENT, NO_KEYS).block());
 
             getSpeedProfile().shortWaitCondition().atMost(org.awaitility.Duration.TEN_MINUTES)
                 .untilAsserted(() -> assertThat(finishedExecutions.get()).isEqualTo(eventCount));
@@ -105,7 +113,7 @@ public interface GroupContract {
                         threads.add(Thread.currentThread().getName());
                         countDownLatch.await();
                     }
-                }, EventBusTestFixture.GROUP_A);
+                }, GROUP_A);
                 eventBus().register(new EventListener.GroupEventListener() {
                     @Override
                     public Group getDefaultGroup() {
@@ -117,7 +125,7 @@ public interface GroupContract {
                         threads.add(Thread.currentThread().getName());
                         countDownLatch.await();
                     }
-                }, EventBusTestFixture.GROUP_B);
+                }, GROUP_B);
                 eventBus().register(new EventListener.GroupEventListener() {
                     @Override
                     public Group getDefaultGroup() {
@@ -131,7 +139,7 @@ public interface GroupContract {
                     }
                 }, EventBusTestFixture.GROUP_C);
 
-                eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).subscribeOn(Schedulers.elastic()).subscribe();
+                eventBus().dispatch(EVENT, NO_KEYS).subscribeOn(Schedulers.elastic()).subscribe();
 
 
                 getSpeedProfile().shortWaitCondition().atMost(org.awaitility.Duration.TEN_SECONDS)
@@ -147,15 +155,15 @@ public interface GroupContract {
             AtomicBoolean successfulRetry = new AtomicBoolean(false);
             EventListener listener = event -> {
                 if (event.getEventId().equals(EVENT_ID)) {
-                    eventBus().dispatch(EventBusTestFixture.EVENT_2, EventBusTestFixture.NO_KEYS)
+                    eventBus().dispatch(EVENT_2, NO_KEYS)
                         .subscribeOn(Schedulers.elastic())
                         .block();
                     successfulRetry.set(true);
                 }
             };
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().register(listener, GROUP_A);
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
             getSpeedProfile().shortWaitCondition().until(successfulRetry::get);
         }
@@ -164,11 +172,11 @@ public interface GroupContract {
         default void registerShouldNotDispatchPastEventsForGroups() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -176,23 +184,23 @@ public interface GroupContract {
         default void listenerGroupShouldReceiveEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void groupListenersShouldNotReceiveNoopEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
             Event noopEvent = new TestEvent(EVENT_ID, Username.of("noop"));
-            eventBus().dispatch(noopEvent, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(noopEvent, NO_KEYS).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -200,11 +208,11 @@ public interface GroupContract {
         default void groupListenersShouldReceiveOnlyHandledEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            eventBus().dispatch(EventBusTestFixture.EVENT_UNSUPPORTED_BY_LISTENER, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT_UNSUPPORTED_BY_LISTENER, NO_KEYS).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -213,9 +221,9 @@ public interface GroupContract {
             EventListener listener = EventBusTestFixture.newListener();
             doThrow(new RuntimeException()).when(listener).event(any());
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            assertThatCode(() -> eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block())
+            assertThatCode(() -> eventBus().dispatch(EVENT, NO_KEYS).block())
                 .doesNotThrowAnyException();
         }
 
@@ -223,24 +231,24 @@ public interface GroupContract {
         default void eachListenerGroupShouldReceiveEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
             EventListener listener2 = EventBusTestFixture.newListener();
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
-            eventBus().register(listener2, EventBusTestFixture.GROUP_B);
+            eventBus().register(listener, GROUP_A);
+            eventBus().register(listener2, GROUP_B);
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
-            verify(listener2, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener2, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void unregisteredGroupListenerShouldNotReceiveEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Registration registration = eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            Registration registration = eventBus().register(listener, GROUP_A);
 
             registration.unregister();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            eventBus().dispatch(EVENT, NO_KEYS).block();
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -249,9 +257,9 @@ public interface GroupContract {
             EventListener listener = EventBusTestFixture.newListener();
             EventListener listener2 = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            assertThatThrownBy(() -> eventBus().register(listener2, EventBusTestFixture.GROUP_A))
+            assertThatThrownBy(() -> eventBus().register(listener2, GROUP_A))
                 .isInstanceOf(GroupAlreadyRegistered.class);
         }
 
@@ -260,9 +268,9 @@ public interface GroupContract {
             EventListener listener = EventBusTestFixture.newListener();
             EventListener listener2 = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A).unregister();
+            eventBus().register(listener, GROUP_A).unregister();
 
-            assertThatCode(() -> eventBus().register(listener2, EventBusTestFixture.GROUP_A))
+            assertThatCode(() -> eventBus().register(listener2, GROUP_A))
                 .doesNotThrowAnyException();
         }
 
@@ -270,7 +278,7 @@ public interface GroupContract {
         default void unregisterShouldBeIdempotentForGroups() {
             EventListener listener = EventBusTestFixture.newListener();
 
-            Registration registration = eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            Registration registration = eventBus().register(listener, GROUP_A);
             registration.unregister();
 
             assertThatCode(registration::unregister)
@@ -281,32 +289,32 @@ public interface GroupContract {
         default void registerShouldAcceptAlreadyUnregisteredGroups() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A).unregister();
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A).unregister();
+            eventBus().register(listener, GROUP_A);
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void dispatchShouldCallSynchronousListener() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void failingGroupListenersShouldNotAbortGroupDelivery() {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution listener = new EventBusTestFixture.EventMatcherThrowingListener(ImmutableSet.of(EventBusTestFixture.EVENT));
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            EventBusTestFixture.EventListenerCountingSuccessfulExecution listener = new EventBusTestFixture.EventMatcherThrowingListener(ImmutableSet.of(EVENT));
+            eventBus().register(listener, GROUP_A);
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
-            eventBus().dispatch(EventBusTestFixture.EVENT_2, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
+            eventBus().dispatch(EVENT_2, NO_KEYS).block();
 
             getSpeedProfile().shortWaitCondition()
                 .untilAsserted(() -> assertThat(listener.numberOfEventCalls()).isEqualTo(1));
@@ -320,12 +328,12 @@ public interface GroupContract {
             when(failingListener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.SYNCHRONOUS);
             doThrow(new RuntimeException()).when(failingListener).event(any());
 
-            eventBus().register(failingListener, EventBusTestFixture.GROUP_A);
-            eventBus().register(listener, EventBusTestFixture.GROUP_B);
+            eventBus().register(failingListener, GROUP_A);
+            eventBus().register(listener, GROUP_B);
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
@@ -336,21 +344,21 @@ public interface GroupContract {
             eventBus().register(listener1, new GenericGroup("a"));
             eventBus().register(listener2, new GenericGroup("b"));
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            verify(listener1, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
-            verify(listener2, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener1, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener2, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void groupListenerShouldReceiveEventWhenRedeliver() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            eventBus().reDeliver(EventBusTestFixture.GROUP_A, EventBusTestFixture.EVENT).block();
+            eventBus().reDeliver(GROUP_A, EVENT).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
@@ -358,15 +366,15 @@ public interface GroupContract {
             EventListener listener = EventBusTestFixture.newListener();
             doThrow(new RuntimeException()).when(listener).event(any());
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
-            assertThatCode(() -> eventBus().reDeliver(EventBusTestFixture.GROUP_A, EventBusTestFixture.EVENT).block())
+            assertThatCode(() -> eventBus().reDeliver(GROUP_A, EVENT).block())
                 .doesNotThrowAnyException();
         }
 
         @Test
         default void redeliverShouldThrowWhenGroupNotRegistered() {
-            assertThatThrownBy(() -> eventBus().reDeliver(EventBusTestFixture.GROUP_A, EventBusTestFixture.EVENT).block())
+            assertThatThrownBy(() -> eventBus().reDeliver(GROUP_A, EVENT).block())
                 .isInstanceOf(GroupRegistrationNotFound.class);
         }
 
@@ -374,9 +382,9 @@ public interface GroupContract {
         default void redeliverShouldThrowAfterGroupIsUnregistered() {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A).unregister();
+            eventBus().register(listener, GROUP_A).unregister();
 
-            assertThatThrownBy(() -> eventBus().reDeliver(EventBusTestFixture.GROUP_A, EventBusTestFixture.EVENT).block())
+            assertThatThrownBy(() -> eventBus().reDeliver(GROUP_A, EVENT).block())
                 .isInstanceOf(GroupRegistrationNotFound.class);
         }
 
@@ -384,25 +392,25 @@ public interface GroupContract {
         default void redeliverShouldOnlySendEventToDefinedGroup() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
             EventListener listener2 = EventBusTestFixture.newListener();
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
-            eventBus().register(listener2, EventBusTestFixture.GROUP_B);
+            eventBus().register(listener, GROUP_A);
+            eventBus().register(listener2, GROUP_B);
 
-            eventBus().reDeliver(EventBusTestFixture.GROUP_A, EventBusTestFixture.EVENT).block();
+            eventBus().reDeliver(GROUP_A, EVENT).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
-            verify(listener2, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never()).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener2, after(FIVE_HUNDRED_MS.toMillis()).never()).event(any());
         }
 
         @Test
         default void groupListenersShouldNotReceiveNoopRedeliveredEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus().register(listener, GROUP_A);
 
             Event noopEvent = new TestEvent(EVENT_ID, Username.of("noop"));
-            eventBus().reDeliver(EventBusTestFixture.GROUP_A, noopEvent).block();
+            eventBus().reDeliver(GROUP_A, noopEvent).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never()).event(any());
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never()).event(any());
         }
     }
 
@@ -412,20 +420,20 @@ public interface GroupContract {
         default void groupsDefinedOnlyOnSomeNodesShouldBeNotifiedWhenDispatch() throws Exception {
             EventListener mailboxListener = EventBusTestFixture.newListener();
 
-            eventBus().register(mailboxListener, EventBusTestFixture.GROUP_A);
+            eventBus().register(mailboxListener, GROUP_A);
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus2().dispatch(EVENT, NO_KEYS).block();
 
-            verify(mailboxListener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(mailboxListener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void groupsDefinedOnlyOnSomeNodesShouldNotBeNotifiedWhenRedeliver() {
             EventListener mailboxListener = EventBusTestFixture.newListener();
 
-            eventBus().register(mailboxListener, EventBusTestFixture.GROUP_A);
+            eventBus().register(mailboxListener, GROUP_A);
 
-            assertThatThrownBy(() -> eventBus2().reDeliver(EventBusTestFixture.GROUP_A, EventBusTestFixture.EVENT).block())
+            assertThatThrownBy(() -> eventBus2().reDeliver(GROUP_A, EVENT).block())
                 .isInstanceOf(GroupRegistrationNotFound.class);
         }
 
@@ -433,36 +441,36 @@ public interface GroupContract {
         default void groupListenersShouldBeExecutedOnceWhenRedeliverInADistributedEnvironment() throws Exception {
             EventListener mailboxListener = EventBusTestFixture.newListener();
 
-            eventBus().register(mailboxListener, EventBusTestFixture.GROUP_A);
-            eventBus2().register(mailboxListener, EventBusTestFixture.GROUP_A);
+            eventBus().register(mailboxListener, GROUP_A);
+            eventBus2().register(mailboxListener, GROUP_A);
 
-            eventBus2().reDeliver(EventBusTestFixture.GROUP_A, EventBusTestFixture.EVENT).block();
+            eventBus2().reDeliver(GROUP_A, EVENT).block();
 
-            verify(mailboxListener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(mailboxListener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void groupListenersShouldBeExecutedOnceInAControlledEnvironment() throws Exception {
             EventListener mailboxListener = EventBusTestFixture.newListener();
 
-            eventBus().register(mailboxListener, EventBusTestFixture.GROUP_A);
-            eventBus2().register(mailboxListener, EventBusTestFixture.GROUP_A);
+            eventBus().register(mailboxListener, GROUP_A);
+            eventBus2().register(mailboxListener, GROUP_A);
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus2().dispatch(EVENT, NO_KEYS).block();
 
-            verify(mailboxListener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(mailboxListener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void unregisterShouldStopNotificationForDistantGroups() throws Exception {
             EventListener mailboxListener = EventBusTestFixture.newListener();
 
-            eventBus().register(mailboxListener, EventBusTestFixture.GROUP_A).unregister();
+            eventBus().register(mailboxListener, GROUP_A).unregister();
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus2().dispatch(EVENT, NO_KEYS).block();
 
 
-            verify(mailboxListener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(mailboxListener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -470,11 +478,11 @@ public interface GroupContract {
         default void registerShouldNotDispatchPastEventsForGroupsInADistributedContext() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            eventBus2().register(listener, EventBusTestFixture.GROUP_A);
+            eventBus2().register(listener, GROUP_A);
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
     }
diff --git a/event-bus/api/src/test/java/org/apache/james/events/KeyContract.java b/event-bus/api/src/test/java/org/apache/james/events/KeyContract.java
index 190b517..52e5a53 100644
--- a/event-bus/api/src/test/java/org/apache/james/events/KeyContract.java
+++ b/event-bus/api/src/test/java/org/apache/james/events/KeyContract.java
@@ -19,7 +19,14 @@
 
 package org.apache.james.events;
 
+import static org.apache.james.events.EventBusTestFixture.EVENT;
 import static org.apache.james.events.EventBusTestFixture.EVENT_ID;
+import static org.apache.james.events.EventBusTestFixture.EVENT_UNSUPPORTED_BY_LISTENER;
+import static org.apache.james.events.EventBusTestFixture.FIVE_HUNDRED_MS;
+import static org.apache.james.events.EventBusTestFixture.KEY_1;
+import static org.apache.james.events.EventBusTestFixture.KEY_2;
+import static org.apache.james.events.EventBusTestFixture.NO_KEYS;
+import static org.apache.james.events.EventBusTestFixture.ONE_SECOND;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.junit.jupiter.api.Assertions.assertTimeout;
@@ -41,6 +48,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.IntStream;
 
 import org.apache.james.core.Username;
+import org.apache.james.events.EventListener.ExecutionMode;
 import org.junit.jupiter.api.Test;
 
 import com.google.common.collect.ImmutableSet;
@@ -66,10 +74,10 @@ public interface KeyContract extends EventBusContract {
                 Thread.sleep(Duration.ofMillis(20).toMillis());
                 finishedExecutions.incrementAndGet();
 
-            }, EventBusTestFixture.KEY_1)).block();
+            }, KEY_1)).block();
 
             IntStream.range(0, eventCount)
-                .forEach(i -> eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.KEY_1).block());
+                .forEach(i -> eventBus().dispatch(EVENT, KEY_1).block());
 
             getSpeedProfile().shortWaitCondition().atMost(org.awaitility.Duration.TEN_MINUTES)
                 .untilAsserted(() -> assertThat(finishedExecutions.get()).isEqualTo(eventCount));
@@ -84,17 +92,17 @@ public interface KeyContract extends EventBusContract {
                 Mono.from(eventBus().register(event -> {
                     threads.add(Thread.currentThread().getName());
                     countDownLatch.await();
-                }, EventBusTestFixture.KEY_1)).block();
+                }, KEY_1)).block();
                 Mono.from(eventBus().register(event -> {
                     threads.add(Thread.currentThread().getName());
                     countDownLatch.await();
-                }, EventBusTestFixture.KEY_1)).block();
+                }, KEY_1)).block();
                 Mono.from(eventBus().register(event -> {
                     threads.add(Thread.currentThread().getName());
                     countDownLatch.await();
-                }, EventBusTestFixture.KEY_1)).block();
+                }, KEY_1)).block();
 
-                eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.KEY_1).subscribeOn(Schedulers.elastic()).subscribe();
+                eventBus().dispatch(EVENT, KEY_1).subscribeOn(Schedulers.elastic()).subscribe();
 
 
                 getSpeedProfile().shortWaitCondition().atMost(org.awaitility.Duration.TEN_SECONDS)
@@ -110,12 +118,12 @@ public interface KeyContract extends EventBusContract {
         default void registeredListenersShouldNotReceiveNoopEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
             Event noopEvent = new EventBusTestFixture.TestEvent(EVENT_ID, Username.of("noop"));
-            eventBus().dispatch(noopEvent, EventBusTestFixture.KEY_1).block();
+            eventBus().dispatch(noopEvent, KEY_1).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -123,11 +131,11 @@ public interface KeyContract extends EventBusContract {
         default void registeredListenersShouldReceiveOnlyHandledEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT_UNSUPPORTED_BY_LISTENER, EventBusTestFixture.KEY_1).block();
+            eventBus().dispatch(EVENT_UNSUPPORTED_BY_LISTENER, KEY_1).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -136,50 +144,50 @@ public interface KeyContract extends EventBusContract {
             EventListener listener = EventBusTestFixture.newListener();
             doThrow(new RuntimeException()).when(listener).event(any());
 
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            assertThatCode(() -> eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block())
+            assertThatCode(() -> eventBus().dispatch(EVENT, NO_KEYS).block())
                 .doesNotThrowAnyException();
         }
 
         @Test
         default void dispatchShouldNotNotifyRegisteredListenerWhenEmptyKeySet() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+            eventBus().dispatch(EVENT, NO_KEYS).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
         @Test
         default void dispatchShouldNotNotifyListenerRegisteredOnOtherKeys() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_2)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_2)).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
         @Test
         default void dispatchShouldNotifyRegisteredListeners() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void dispatchShouldNotifyLocalRegisteredListenerWithoutDelay() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
             verify(listener, times(1)).event(any());
         }
@@ -188,13 +196,13 @@ public interface KeyContract extends EventBusContract {
         default void dispatchShouldNotifyOnlyRegisteredListener() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
             EventListener listener2 = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener2, EventBusTestFixture.KEY_2)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
+            Mono.from(eventBus().register(listener2, KEY_2)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
-            verify(listener2, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener2, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -202,35 +210,35 @@ public interface KeyContract extends EventBusContract {
         default void dispatchShouldNotifyAllListenersRegisteredOnAKey() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
             EventListener listener2 = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener2, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
+            Mono.from(eventBus().register(listener2, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
-            verify(listener2, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener2, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void registerShouldAllowDuplicatedRegistration() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void unregisterShouldRemoveDoubleRegisteredListener() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block().unregister();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block().unregister();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -238,43 +246,43 @@ public interface KeyContract extends EventBusContract {
         default void registerShouldNotDispatchPastEvents() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
         @Test
         default void callingAllUnregisterMethodShouldUnregisterTheListener() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Registration registration = Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block().unregister();
+            Registration registration = Mono.from(eventBus().register(listener, KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block().unregister();
             registration.unregister();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
         @Test
         default void unregisterShouldHaveNotNotifyWhenCalledOnDifferentKeys() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_2)).block().unregister();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_2)).block().unregister();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void unregisterShouldBeIdempotentForKeyRegistrations() {
             EventListener listener = EventBusTestFixture.newListener();
 
-            Registration registration = Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Registration registration = Mono.from(eventBus().register(listener, KEY_1)).block();
             registration.unregister();
 
             assertThatCode(registration::unregister)
@@ -284,32 +292,32 @@ public interface KeyContract extends EventBusContract {
         @Test
         default void dispatchShouldAcceptSeveralKeys() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1, EventBusTestFixture.KEY_2)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1, KEY_2)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void dispatchShouldCallListenerOnceWhenSeveralKeysMatching() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_2)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_2)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1, EventBusTestFixture.KEY_2)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1, KEY_2)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void dispatchShouldNotNotifyUnregisteredListener() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block().unregister();
+            Mono.from(eventBus().register(listener, KEY_1)).block().unregister();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -317,38 +325,38 @@ public interface KeyContract extends EventBusContract {
         @Test
         default void dispatchShouldNotifyAsynchronousListener() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.ASYNCHRONOUS);
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.ASYNCHRONOUS);
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.KEY_1).block();
+            eventBus().dispatch(EVENT, KEY_1).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis())).event(EventBusTestFixture.EVENT);
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis())).event(EVENT);
         }
 
         @Test
         default void dispatchShouldNotBlockAsynchronousListener() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.ASYNCHRONOUS);
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.ASYNCHRONOUS);
             CountDownLatch latch = new CountDownLatch(1);
             doAnswer(invocation -> {
                 latch.await();
                 return null;
-            }).when(listener).event(EventBusTestFixture.EVENT);
+            }).when(listener).event(EVENT);
 
             assertTimeout(Duration.ofSeconds(2),
                 () -> {
-                    eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.NO_KEYS).block();
+                    eventBus().dispatch(EVENT, NO_KEYS).block();
                     latch.countDown();
                 });
         }
 
         @Test
         default void failingRegisteredListenersShouldNotAbortRegisteredDelivery() {
-            EventBusTestFixture.EventListenerCountingSuccessfulExecution listener = new EventBusTestFixture.EventMatcherThrowingListener(ImmutableSet.of(EventBusTestFixture.EVENT));
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            EventBusTestFixture.EventListenerCountingSuccessfulExecution listener = new EventBusTestFixture.EventMatcherThrowingListener(ImmutableSet.of(EVENT));
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.KEY_1).block();
-            eventBus().dispatch(EventBusTestFixture.EVENT_2, EventBusTestFixture.KEY_1).block();
+            eventBus().dispatch(EVENT, KEY_1).block();
+            eventBus().dispatch(EventBusTestFixture.EVENT_2, KEY_1).block();
 
             getSpeedProfile().shortWaitCondition()
                 .untilAsserted(() -> assertThat(listener.numberOfEventCalls()).isEqualTo(1));
@@ -359,15 +367,15 @@ public interface KeyContract extends EventBusContract {
             EventListener listener = EventBusTestFixture.newListener();
 
             EventListener failingListener = mock(EventListener.class);
-            when(failingListener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.SYNCHRONOUS);
+            when(failingListener.getExecutionMode()).thenReturn(ExecutionMode.SYNCHRONOUS);
             doThrow(new RuntimeException()).when(failingListener).event(any());
 
-            Mono.from(eventBus().register(failingListener, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(failingListener, KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            eventBus().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(listener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(listener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
     }
 
@@ -377,22 +385,22 @@ public interface KeyContract extends EventBusContract {
         default void crossEventBusRegistrationShouldBeAllowed() throws Exception {
             EventListener mailboxListener = EventBusTestFixture.newListener();
 
-            Mono.from(eventBus().register(mailboxListener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(mailboxListener, KEY_1)).block();
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.KEY_1).block();
+            eventBus2().dispatch(EVENT, KEY_1).block();
 
-            verify(mailboxListener, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(mailboxListener, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void unregisteredDistantListenersShouldNotBeNotified() throws Exception {
             EventListener eventListener = EventBusTestFixture.newListener();
 
-            Mono.from(eventBus().register(eventListener, EventBusTestFixture.KEY_1)).block().unregister();
+            Mono.from(eventBus().register(eventListener, KEY_1)).block().unregister();
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus2().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            verify(eventListener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(eventListener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -401,24 +409,24 @@ public interface KeyContract extends EventBusContract {
             EventListener mailboxListener1 = EventBusTestFixture.newListener();
             EventListener mailboxListener2 = EventBusTestFixture.newListener();
 
-            Mono.from(eventBus().register(mailboxListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus2().register(mailboxListener2, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(mailboxListener1, KEY_1)).block();
+            Mono.from(eventBus2().register(mailboxListener2, KEY_1)).block();
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.KEY_1).block();
+            eventBus2().dispatch(EVENT, KEY_1).block();
 
-            verify(mailboxListener1, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
-            verify(mailboxListener2, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(mailboxListener1, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(mailboxListener2, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
         @Test
         default void registerShouldNotDispatchPastEventsInDistributedContext() throws Exception {
             EventListener listener = EventBusTestFixture.newListener();
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, ImmutableSet.of(EventBusTestFixture.KEY_1)).block();
+            eventBus2().dispatch(EVENT, ImmutableSet.of(KEY_1)).block();
 
-            Mono.from(eventBus().register(listener, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(listener, KEY_1)).block();
 
-            verify(listener, after(EventBusTestFixture.FIVE_HUNDRED_MS.toMillis()).never())
+            verify(listener, after(FIVE_HUNDRED_MS.toMillis()).never())
                 .event(any());
         }
 
@@ -427,13 +435,13 @@ public interface KeyContract extends EventBusContract {
             EventListener mailboxListener1 = EventBusTestFixture.newListener();
             EventListener mailboxListener2 = EventBusTestFixture.newListener();
 
-            Mono.from(eventBus().register(mailboxListener1, EventBusTestFixture.KEY_1)).block();
-            Mono.from(eventBus2().register(mailboxListener2, EventBusTestFixture.KEY_1)).block();
+            Mono.from(eventBus().register(mailboxListener1, KEY_1)).block();
+            Mono.from(eventBus2().register(mailboxListener2, KEY_1)).block();
 
-            eventBus2().dispatch(EventBusTestFixture.EVENT, EventBusTestFixture.KEY_1).block();
+            eventBus2().dispatch(EVENT, KEY_1).block();
 
             verify(mailboxListener2, times(1)).event(any());
-            verify(mailboxListener1, timeout(EventBusTestFixture.ONE_SECOND.toMillis()).times(1)).event(any());
+            verify(mailboxListener1, timeout(ONE_SECOND.toMillis()).times(1)).event(any());
         }
 
     }
diff --git a/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersDAO.java b/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersDAO.java
index df1f339..096cce6 100644
--- a/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersDAO.java
+++ b/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersDAO.java
@@ -24,11 +24,14 @@ import static com.datastax.driver.core.querybuilder.QueryBuilder.delete;
 import static com.datastax.driver.core.querybuilder.QueryBuilder.eq;
 import static com.datastax.driver.core.querybuilder.QueryBuilder.insertInto;
 import static com.datastax.driver.core.querybuilder.QueryBuilder.select;
+import static org.apache.james.events.tables.CassandraEventDeadLettersTable.EVENT;
+import static org.apache.james.events.tables.CassandraEventDeadLettersTable.GROUP;
+import static org.apache.james.events.tables.CassandraEventDeadLettersTable.INSERTION_ID;
+import static org.apache.james.events.tables.CassandraEventDeadLettersTable.TABLE_NAME;
 
 import javax.inject.Inject;
 
 import org.apache.james.backends.cassandra.utils.CassandraAsyncExecutor;
-import org.apache.james.events.tables.CassandraEventDeadLettersTable;
 
 import com.datastax.driver.core.PreparedStatement;
 import com.datastax.driver.core.Session;
@@ -57,62 +60,62 @@ public class CassandraEventDeadLettersDAO {
     }
 
     private PreparedStatement prepareInsertStatement(Session session) {
-        return session.prepare(insertInto(CassandraEventDeadLettersTable.TABLE_NAME)
-            .value(CassandraEventDeadLettersTable.GROUP, bindMarker(CassandraEventDeadLettersTable.GROUP))
-            .value(CassandraEventDeadLettersTable.INSERTION_ID, bindMarker(CassandraEventDeadLettersTable.INSERTION_ID))
-            .value(CassandraEventDeadLettersTable.EVENT, bindMarker(CassandraEventDeadLettersTable.EVENT)));
+        return session.prepare(insertInto(TABLE_NAME)
+            .value(GROUP, bindMarker(GROUP))
+            .value(INSERTION_ID, bindMarker(INSERTION_ID))
+            .value(EVENT, bindMarker(EVENT)));
     }
 
     private PreparedStatement prepareDeleteStatement(Session session) {
         return session.prepare(delete()
-            .from(CassandraEventDeadLettersTable.TABLE_NAME)
-            .where(eq(CassandraEventDeadLettersTable.GROUP, bindMarker(CassandraEventDeadLettersTable.GROUP)))
-            .and(eq(CassandraEventDeadLettersTable.INSERTION_ID, bindMarker(CassandraEventDeadLettersTable.INSERTION_ID))));
+            .from(TABLE_NAME)
+            .where(eq(GROUP, bindMarker(GROUP)))
+            .and(eq(INSERTION_ID, bindMarker(INSERTION_ID))));
     }
 
     private PreparedStatement prepareSelectEventStatement(Session session) {
-        return session.prepare(select(CassandraEventDeadLettersTable.EVENT)
-            .from(CassandraEventDeadLettersTable.TABLE_NAME)
-            .where(eq(CassandraEventDeadLettersTable.GROUP, bindMarker(CassandraEventDeadLettersTable.GROUP)))
-            .and(eq(CassandraEventDeadLettersTable.INSERTION_ID, bindMarker(CassandraEventDeadLettersTable.INSERTION_ID))));
+        return session.prepare(select(EVENT)
+            .from(TABLE_NAME)
+            .where(eq(GROUP, bindMarker(GROUP)))
+            .and(eq(INSERTION_ID, bindMarker(INSERTION_ID))));
     }
 
     private PreparedStatement prepareSelectInsertionIdsWithGroupStatement(Session session) {
-        return session.prepare(select(CassandraEventDeadLettersTable.INSERTION_ID)
-            .from(CassandraEventDeadLettersTable.TABLE_NAME)
-            .where(eq(CassandraEventDeadLettersTable.GROUP, bindMarker(CassandraEventDeadLettersTable.GROUP))));
+        return session.prepare(select(INSERTION_ID)
+            .from(TABLE_NAME)
+            .where(eq(GROUP, bindMarker(GROUP))));
     }
 
     private PreparedStatement prepareContainEventStatement(Session session) {
-        return session.prepare(select(CassandraEventDeadLettersTable.EVENT)
-            .from(CassandraEventDeadLettersTable.TABLE_NAME)
+        return session.prepare(select(EVENT)
+            .from(TABLE_NAME)
             .limit(1));
     }
 
     Mono<Void> store(Group group, Event failedEvent, EventDeadLetters.InsertionId insertionId) {
         return executor.executeVoid(insertStatement.bind()
-                .setString(CassandraEventDeadLettersTable.GROUP, group.asString())
-                .setUUID(CassandraEventDeadLettersTable.INSERTION_ID, insertionId.getId())
-                .setString(CassandraEventDeadLettersTable.EVENT, eventSerializer.toJson(failedEvent)));
+                .setString(GROUP, group.asString())
+                .setUUID(INSERTION_ID, insertionId.getId())
+                .setString(EVENT, eventSerializer.toJson(failedEvent)));
     }
 
     Mono<Void> removeEvent(Group group, EventDeadLetters.InsertionId failedInsertionId) {
         return executor.executeVoid(deleteStatement.bind()
-                .setString(CassandraEventDeadLettersTable.GROUP, group.asString())
-                .setUUID(CassandraEventDeadLettersTable.INSERTION_ID, failedInsertionId.getId()));
+                .setString(GROUP, group.asString())
+                .setUUID(INSERTION_ID, failedInsertionId.getId()));
     }
 
     Mono<Event> retrieveFailedEvent(Group group, EventDeadLetters.InsertionId insertionId) {
         return executor.executeSingleRow(selectEventStatement.bind()
-                .setString(CassandraEventDeadLettersTable.GROUP, group.asString())
-                .setUUID(CassandraEventDeadLettersTable.INSERTION_ID, insertionId.getId()))
-            .map(row -> deserializeEvent(row.getString(CassandraEventDeadLettersTable.EVENT)));
+                .setString(GROUP, group.asString())
+                .setUUID(INSERTION_ID, insertionId.getId()))
+            .map(row -> deserializeEvent(row.getString(EVENT)));
     }
 
     Flux<EventDeadLetters.InsertionId> retrieveInsertionIdsWithGroup(Group group) {
         return executor.executeRows(selectEventIdsWithGroupStatement.bind()
-                .setString(CassandraEventDeadLettersTable.GROUP, group.asString()))
-            .map(row -> EventDeadLetters.InsertionId.of(row.getUUID(CassandraEventDeadLettersTable.INSERTION_ID)));
+                .setString(GROUP, group.asString()))
+            .map(row -> EventDeadLetters.InsertionId.of(row.getUUID(INSERTION_ID)));
     }
 
     Mono<Boolean> containEvents() {
diff --git a/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersGroupDAO.java b/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersGroupDAO.java
index 2fefd3c..bd0c27e 100644
--- a/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersGroupDAO.java
+++ b/event-bus/cassandra/src/main/java/org/apache/james/events/CassandraEventDeadLettersGroupDAO.java
@@ -20,11 +20,12 @@
 package org.apache.james.events;
 
 import static com.datastax.driver.core.querybuilder.QueryBuilder.bindMarker;
+import static org.apache.james.events.tables.CassandraEventDeadLettersGroupTable.GROUP;
+import static org.apache.james.events.tables.CassandraEventDeadLettersGroupTable.TABLE_NAME;
 
 import javax.inject.Inject;
 
 import org.apache.james.backends.cassandra.utils.CassandraAsyncExecutor;
-import org.apache.james.events.tables.CassandraEventDeadLettersGroupTable;
 
 import com.datastax.driver.core.PreparedStatement;
 import com.datastax.driver.core.Session;
@@ -47,22 +48,22 @@ public class CassandraEventDeadLettersGroupDAO {
     }
 
     private PreparedStatement prepareInsertStatement(Session session) {
-        return session.prepare(QueryBuilder.insertInto(CassandraEventDeadLettersGroupTable.TABLE_NAME)
-            .value(CassandraEventDeadLettersGroupTable.GROUP, bindMarker(CassandraEventDeadLettersGroupTable.GROUP)));
+        return session.prepare(QueryBuilder.insertInto(TABLE_NAME)
+            .value(GROUP, bindMarker(GROUP)));
     }
 
     private PreparedStatement prepareSelectStatement(Session session) {
-        return session.prepare(QueryBuilder.select(CassandraEventDeadLettersGroupTable.GROUP)
-            .from(CassandraEventDeadLettersGroupTable.TABLE_NAME));
+        return session.prepare(QueryBuilder.select(GROUP)
+            .from(TABLE_NAME));
     }
 
     Mono<Void> storeGroup(Group group) {
         return executor.executeVoid(insertStatement.bind()
-                .setString(CassandraEventDeadLettersGroupTable.GROUP, group.asString()));
+                .setString(GROUP, group.asString()));
     }
 
     Flux<Group> retrieveAllGroups() {
         return executor.executeRows(selectAllStatement.bind())
-            .map(Throwing.function(row -> Group.deserialize(row.getString(CassandraEventDeadLettersGroupTable.GROUP))));
+            .map(Throwing.function(row -> Group.deserialize(row.getString(GROUP))));
     }
 }
diff --git a/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersDAOTest.java b/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersDAOTest.java
index 114022d..ffa7cd3 100644
--- a/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersDAOTest.java
+++ b/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersDAOTest.java
@@ -19,6 +19,13 @@
 
 package org.apache.james.events;
 
+import static org.apache.james.events.EventDeadLettersContract.EVENT_1;
+import static org.apache.james.events.EventDeadLettersContract.EVENT_2;
+import static org.apache.james.events.EventDeadLettersContract.GROUP_A;
+import static org.apache.james.events.EventDeadLettersContract.GROUP_B;
+import static org.apache.james.events.EventDeadLettersContract.INSERTION_ID_1;
+import static org.apache.james.events.EventDeadLettersContract.INSERTION_ID_2;
+import static org.apache.james.events.EventDeadLettersContract.INSERTION_ID_3;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import org.apache.james.backends.cassandra.CassandraCluster;
@@ -42,12 +49,12 @@ class CassandraEventDeadLettersDAOTest {
 
     @Test
     void removeEventShouldSucceededWhenRemoveStoredEvent() {
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_A, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.store(GROUP_A, EVENT_1, INSERTION_ID_1).block();
 
-        cassandraEventDeadLettersDAO.removeEvent(EventDeadLettersContract.GROUP_A, EventDeadLettersContract.INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.removeEvent(GROUP_A, INSERTION_ID_1).block();
 
         assertThat(cassandraEventDeadLettersDAO
-                .retrieveInsertionIdsWithGroup(EventDeadLettersContract.GROUP_A)
+                .retrieveInsertionIdsWithGroup(GROUP_A)
                 .collectList().block())
             .isEmpty();
     }
@@ -55,45 +62,45 @@ class CassandraEventDeadLettersDAOTest {
     @Test
     void retrieveFailedEventShouldReturnEmptyWhenDefault() {
         assertThat(cassandraEventDeadLettersDAO
-                .retrieveFailedEvent(EventDeadLettersContract.GROUP_A, EventDeadLettersContract.INSERTION_ID_1)
+                .retrieveFailedEvent(GROUP_A, INSERTION_ID_1)
                 .blockOptional().isPresent())
             .isFalse();
     }
 
     @Test
     void retrieveFailedEventShouldReturnStoredEvent() {
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_A, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_1).block();
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_2, EventDeadLettersContract.INSERTION_ID_2).block();
+        cassandraEventDeadLettersDAO.store(GROUP_A, EVENT_1, INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_2, INSERTION_ID_2).block();
 
         assertThat(cassandraEventDeadLettersDAO
-                .retrieveFailedEvent(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.INSERTION_ID_2)
+                .retrieveFailedEvent(GROUP_B, INSERTION_ID_2)
                 .blockOptional().get())
-            .isEqualTo(EventDeadLettersContract.EVENT_2);
+            .isEqualTo(EVENT_2);
     }
 
     @Test
     void retrieveInsertionIdsWithGroupShouldReturnEmptyWhenDefault() {
         assertThat(cassandraEventDeadLettersDAO
-                .retrieveInsertionIdsWithGroup(EventDeadLettersContract.GROUP_A)
+                .retrieveInsertionIdsWithGroup(GROUP_A)
                 .collectList().block())
             .isEmpty();
     }
 
     @Test
     void retrieveInsertionIdsWithGroupShouldReturnStoredInsertionId() {
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_1).block();
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_2, EventDeadLettersContract.INSERTION_ID_2).block();
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_3, EventDeadLettersContract.INSERTION_ID_3).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_2, INSERTION_ID_2).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EventDeadLettersContract.EVENT_3, INSERTION_ID_3).block();
 
         assertThat(cassandraEventDeadLettersDAO
-                .retrieveInsertionIdsWithGroup(EventDeadLettersContract.GROUP_B)
+                .retrieveInsertionIdsWithGroup(GROUP_B)
                 .collectList().block())
-            .containsOnly(EventDeadLettersContract.INSERTION_ID_1, EventDeadLettersContract.INSERTION_ID_2, EventDeadLettersContract.INSERTION_ID_3);
+            .containsOnly(INSERTION_ID_1, INSERTION_ID_2, INSERTION_ID_3);
     }
 
     @Test
     void shouldReturnTrueWhenEventStored() {
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
         assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();
     }
 
@@ -104,28 +111,28 @@ class CassandraEventDeadLettersDAOTest {
 
     @Test
     void shouldReturnTrueWhenEventsStoredAndRemovedSome() {
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_1).block();
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_2).block();
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_3).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_2).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_3).block();
 
         assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();
 
-        cassandraEventDeadLettersDAO.removeEvent(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.INSERTION_ID_3).block();
+        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_3).block();
 
         assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();
     }
 
     @Test
     void shouldReturnFalseWhenRemovedAllEventsStored() {
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_1).block();
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_2).block();
-        cassandraEventDeadLettersDAO.store(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.EVENT_1, EventDeadLettersContract.INSERTION_ID_3).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_2).block();
+        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_3).block();
 
         assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();
 
-        cassandraEventDeadLettersDAO.removeEvent(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.INSERTION_ID_3).block();
-        cassandraEventDeadLettersDAO.removeEvent(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.INSERTION_ID_2).block();
-        cassandraEventDeadLettersDAO.removeEvent(EventDeadLettersContract.GROUP_B, EventDeadLettersContract.INSERTION_ID_1).block();
+        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_3).block();
+        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_2).block();
+        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_1).block();
 
         assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isFalse();
     }
diff --git a/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersGroupDAOTest.java b/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersGroupDAOTest.java
index f5eef74..891070e 100644
--- a/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersGroupDAOTest.java
+++ b/event-bus/cassandra/src/test/java/org/apache/james/events/CassandraEventDeadLettersGroupDAOTest.java
@@ -19,6 +19,8 @@
 
 package org.apache.james.events;
 
+import static org.apache.james.events.EventDeadLettersContract.GROUP_A;
+import static org.apache.james.events.EventDeadLettersContract.GROUP_B;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import org.apache.james.backends.cassandra.CassandraCluster;
@@ -48,11 +50,11 @@ public class CassandraEventDeadLettersGroupDAOTest {
 
     @Test
     void retrieveAllGroupsShouldReturnStoredGroups() {
-        GROUP_DAO.storeGroup(EventDeadLettersContract.GROUP_A).block();
-        GROUP_DAO.storeGroup(EventDeadLettersContract.GROUP_B).block();
+        GROUP_DAO.storeGroup(GROUP_A).block();
+        GROUP_DAO.storeGroup(GROUP_B).block();
 
         assertThat(GROUP_DAO.retrieveAllGroups()
                 .collectList().block())
-            .containsOnly(EventDeadLettersContract.GROUP_A, EventDeadLettersContract.GROUP_B);
+            .containsOnly(GROUP_A, GROUP_B);
     }
 }
diff --git a/event-bus/distributed/src/main/java/org/apache/james/events/GroupConsumerRetry.java b/event-bus/distributed/src/main/java/org/apache/james/events/GroupConsumerRetry.java
index 10d922a..5c6fd2e 100644
--- a/event-bus/distributed/src/main/java/org/apache/james/events/GroupConsumerRetry.java
+++ b/event-bus/distributed/src/main/java/org/apache/james/events/GroupConsumerRetry.java
@@ -24,6 +24,7 @@ import static org.apache.james.backends.rabbitmq.Constants.DIRECT_EXCHANGE;
 import static org.apache.james.backends.rabbitmq.Constants.DURABLE;
 import static org.apache.james.backends.rabbitmq.Constants.EMPTY_ROUTING_KEY;
 import static org.apache.james.events.GroupRegistration.RETRY_COUNT;
+import static org.apache.james.events.RabbitMQEventBus.MAILBOX_EVENT;
 
 import java.nio.charset.StandardCharsets;
 
@@ -51,7 +52,7 @@ class GroupConsumerRetry {
             return new RetryExchangeName(group.asString());
         }
 
-        static final String MAILBOX_EVENT_RETRY_EXCHANGE_PREFIX = RabbitMQEventBus.MAILBOX_EVENT + "-retryExchange-";
+        static final String MAILBOX_EVENT_RETRY_EXCHANGE_PREFIX = MAILBOX_EVENT + "-retryExchange-";
 
         private final String name;
 
diff --git a/event-bus/distributed/src/main/java/org/apache/james/events/GroupRegistration.java b/event-bus/distributed/src/main/java/org/apache/james/events/GroupRegistration.java
index ad2b7ad..07739ac 100644
--- a/event-bus/distributed/src/main/java/org/apache/james/events/GroupRegistration.java
+++ b/event-bus/distributed/src/main/java/org/apache/james/events/GroupRegistration.java
@@ -25,6 +25,7 @@ import static org.apache.james.backends.rabbitmq.Constants.EMPTY_ROUTING_KEY;
 import static org.apache.james.backends.rabbitmq.Constants.EXCLUSIVE;
 import static org.apache.james.backends.rabbitmq.Constants.REQUEUE;
 import static org.apache.james.backends.rabbitmq.Constants.deadLetterQueue;
+import static org.apache.james.events.RabbitMQEventBus.MAILBOX_EVENT;
 
 import java.nio.charset.StandardCharsets;
 import java.util.Objects;
@@ -56,7 +57,7 @@ class GroupRegistration implements Registration {
             return new WorkQueueName(group);
         }
 
-        static final String MAILBOX_EVENT_WORK_QUEUE_PREFIX = RabbitMQEventBus.MAILBOX_EVENT + "-workQueue-";
+        static final String MAILBOX_EVENT_WORK_QUEUE_PREFIX = MAILBOX_EVENT + "-workQueue-";
 
         private final Group group;
 
diff --git a/event-bus/distributed/src/main/java/org/apache/james/events/KeyReconnectionHandler.java b/event-bus/distributed/src/main/java/org/apache/james/events/KeyReconnectionHandler.java
index 24b5dd1..8b15173 100644
--- a/event-bus/distributed/src/main/java/org/apache/james/events/KeyReconnectionHandler.java
+++ b/event-bus/distributed/src/main/java/org/apache/james/events/KeyReconnectionHandler.java
@@ -22,6 +22,8 @@ package org.apache.james.events;
 import static org.apache.james.backends.rabbitmq.Constants.AUTO_DELETE;
 import static org.apache.james.backends.rabbitmq.Constants.DURABLE;
 import static org.apache.james.backends.rabbitmq.Constants.EXCLUSIVE;
+import static org.apache.james.events.KeyRegistrationHandler.EVENTBUS_QUEUE_NAME_PREFIX;
+import static org.apache.james.events.KeyRegistrationHandler.QUEUE_ARGUMENTS;
 
 import javax.inject.Inject;
 
@@ -49,7 +51,7 @@ public class KeyReconnectionHandler implements SimpleConnectionPool.Reconnection
     public Publisher<Void> handleReconnection(Connection connection) {
         return Mono.fromRunnable(() -> {
             try (Channel channel = connection.createChannel()) {
-                channel.queueDeclare(KeyRegistrationHandler.EVENTBUS_QUEUE_NAME_PREFIX + eventBusId.asString(), DURABLE, !EXCLUSIVE, AUTO_DELETE, KeyRegistrationHandler.QUEUE_ARGUMENTS);
+                channel.queueDeclare(EVENTBUS_QUEUE_NAME_PREFIX + eventBusId.asString(), DURABLE, !EXCLUSIVE, AUTO_DELETE, QUEUE_ARGUMENTS);
             } catch (Exception e) {
                 LOGGER.error("Error recovering connection", e);
             }
diff --git a/event-bus/in-vm/src/test/java/org/apache/james/events/delivery/InVmEventDeliveryTest.java b/event-bus/in-vm/src/test/java/org/apache/james/events/delivery/InVmEventDeliveryTest.java
index a0536a0..ab2a92b 100644
--- a/event-bus/in-vm/src/test/java/org/apache/james/events/delivery/InVmEventDeliveryTest.java
+++ b/event-bus/in-vm/src/test/java/org/apache/james/events/delivery/InVmEventDeliveryTest.java
@@ -19,19 +19,23 @@
 
 package org.apache.james.events.delivery;
 
+import static org.apache.james.events.EventBusTestFixture.EVENT;
+import static org.apache.james.events.EventBusTestFixture.GROUP_A;
+import static org.apache.james.events.delivery.EventDelivery.PermanentFailureHandler.NO_HANDLER;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.mockito.Mockito.doThrow;
-import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
 
 import java.time.Duration;
 
 import org.apache.james.events.EventBusTestFixture;
-import org.apache.james.events.EventListener;
+import org.apache.james.events.EventListener.ExecutionMode;
 import org.apache.james.events.MemoryEventDeadLetters;
 import org.apache.james.events.RetryBackoffConfiguration;
+import org.apache.james.events.delivery.EventDelivery.DeliveryOption;
+import org.apache.james.events.delivery.EventDelivery.Retryer.BackoffRetryer;
 import org.apache.james.metrics.tests.RecordingMetricFactory;
 import org.assertj.core.api.SoftAssertions;
 import org.junit.jupiter.api.BeforeEach;
@@ -58,8 +62,8 @@ class InVmEventDeliveryTest {
 
         @Test
         void deliverShouldDeliverEvent() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.SYNCHRONOUS);
-            inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.SYNCHRONOUS);
+            inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                 .block();
 
             assertThat(listener.numberOfEventCalls())
@@ -68,19 +72,19 @@ class InVmEventDeliveryTest {
 
         @Test
         void deliverShouldReturnSuccessSynchronousMono() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.SYNCHRONOUS);
-            assertThatCode(() -> inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.SYNCHRONOUS);
+            assertThatCode(() -> inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                     .block())
                 .doesNotThrowAnyException();
         }
 
         @Test
         void deliverShouldNotDeliverWhenListenerGetException() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.SYNCHRONOUS);
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.SYNCHRONOUS);
             doThrow(new RuntimeException())
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
-            assertThatThrownBy(() -> inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            assertThatThrownBy(() -> inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                 .block())
             .isInstanceOf(RuntimeException.class);
 
@@ -90,11 +94,11 @@ class InVmEventDeliveryTest {
 
         @Test
         void deliverShouldReturnAnErrorMonoWhenListenerGetException() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.SYNCHRONOUS);
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.SYNCHRONOUS);
             doThrow(new RuntimeException())
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
-            assertThatThrownBy(() -> inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            assertThatThrownBy(() -> inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                 .block())
             .isInstanceOf(RuntimeException.class);
         }
@@ -105,8 +109,8 @@ class InVmEventDeliveryTest {
 
         @Test
         void deliverShouldDeliverEvent() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.ASYNCHRONOUS);
-            inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.ASYNCHRONOUS);
+            inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                 .block();
 
             assertThat(listener.numberOfEventCalls())
@@ -115,30 +119,30 @@ class InVmEventDeliveryTest {
 
         @Test
         void deliverShouldReturnSuccessSynchronousMono() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.ASYNCHRONOUS);
-            assertThatCode(() -> inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.ASYNCHRONOUS);
+            assertThatCode(() -> inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                     .block())
                 .doesNotThrowAnyException();
         }
 
         @Test
         void deliverShouldNotFailWhenListenerGetException() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.ASYNCHRONOUS);
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.ASYNCHRONOUS);
             doThrow(new RuntimeException())
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
-            assertThatCode(() -> inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            assertThatCode(() -> inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                 .block())
             .doesNotThrowAnyException();
         }
 
         @Test
         void deliverShouldReturnAnSuccessSyncMonoWhenListenerGetException() {
-            when(listener.getExecutionMode()).thenReturn(EventListener.ExecutionMode.ASYNCHRONOUS);
+            when(listener.getExecutionMode()).thenReturn(ExecutionMode.ASYNCHRONOUS);
             doThrow(new RuntimeException())
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
-            assertThatCode(() -> inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT, EventDelivery.DeliveryOption.none())
+            assertThatCode(() -> inVmEventDelivery.deliver(listener, EVENT, DeliveryOption.none())
                 .block())
             .doesNotThrowAnyException();
         }
@@ -154,12 +158,12 @@ class InVmEventDeliveryTest {
                 .doThrow(new RuntimeException())
                 .doThrow(new RuntimeException())
                 .doCallRealMethod()
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
-            inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT,
-                EventDelivery.DeliveryOption.of(
-                    EventDelivery.Retryer.BackoffRetryer.of(RetryBackoffConfiguration.DEFAULT, listener),
-                    EventDelivery.PermanentFailureHandler.NO_HANDLER))
+            inVmEventDelivery.deliver(listener, EVENT,
+                DeliveryOption.of(
+                    BackoffRetryer.of(RetryBackoffConfiguration.DEFAULT, listener),
+                    NO_HANDLER))
                 .block();
 
             assertThat(listener.numberOfEventCalls())
@@ -170,18 +174,18 @@ class InVmEventDeliveryTest {
         void failureHandlerShouldWorkWhenDeliverWithFailureHandler() {
             EventBusTestFixture.EventListenerCountingSuccessfulExecution listener = newListener();
             doThrow(new RuntimeException())
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
             MemoryEventDeadLetters deadLetter = new MemoryEventDeadLetters();
 
-            inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT,
-                EventDelivery.DeliveryOption.of(
+            inVmEventDelivery.deliver(listener, EVENT,
+                DeliveryOption.of(
                     EventDelivery.Retryer.NO_RETRYER,
-                    EventDelivery.PermanentFailureHandler.StoreToDeadLetters.of(EventBusTestFixture.GROUP_A, deadLetter)))
+                    EventDelivery.PermanentFailureHandler.StoreToDeadLetters.of(GROUP_A, deadLetter)))
                 .block();
 
             assertThat(deadLetter.groupsWithFailedEvents().toStream())
-                .containsOnly(EventBusTestFixture.GROUP_A);
+                .containsOnly(GROUP_A);
         }
 
         @Test
@@ -190,14 +194,14 @@ class InVmEventDeliveryTest {
             doThrow(new RuntimeException())
                 .doThrow(new RuntimeException())
                 .doCallRealMethod()
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
             MemoryEventDeadLetters deadLetter = new MemoryEventDeadLetters();
 
-            inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT,
-                EventDelivery.DeliveryOption.of(
-                    EventDelivery.Retryer.BackoffRetryer.of(RetryBackoffConfiguration.DEFAULT, listener),
-                    EventDelivery.PermanentFailureHandler.StoreToDeadLetters.of(EventBusTestFixture.GROUP_A, deadLetter)))
+            inVmEventDelivery.deliver(listener, EVENT,
+                DeliveryOption.of(
+                    BackoffRetryer.of(RetryBackoffConfiguration.DEFAULT, listener),
+                    EventDelivery.PermanentFailureHandler.StoreToDeadLetters.of(GROUP_A, deadLetter)))
                 .block();
 
             SoftAssertions.assertSoftly(softy -> {
@@ -223,25 +227,25 @@ class InVmEventDeliveryTest {
                 .doThrow(new RuntimeException())
                 .doThrow(new RuntimeException())
                 .doCallRealMethod()
-                .when(listener).event(EventBusTestFixture.EVENT);
+                .when(listener).event(EVENT);
 
             MemoryEventDeadLetters deadLetter = new MemoryEventDeadLetters();
 
-            inVmEventDelivery.deliver(listener, EventBusTestFixture.EVENT,
-                EventDelivery.DeliveryOption.of(
-                    EventDelivery.Retryer.BackoffRetryer.of(RetryBackoffConfiguration.builder()
+            inVmEventDelivery.deliver(listener, EVENT,
+                DeliveryOption.of(
+                    BackoffRetryer.of(RetryBackoffConfiguration.builder()
                             .maxRetries(8)
                             .firstBackoff(Duration.ofMillis(1))
                             .jitterFactor(0.2)
                             .build(), listener),
-                    EventDelivery.PermanentFailureHandler.StoreToDeadLetters.of(EventBusTestFixture.GROUP_A, deadLetter)))
+                    EventDelivery.PermanentFailureHandler.StoreToDeadLetters.of(GROUP_A, deadLetter)))
                 .block();
 
             SoftAssertions.assertSoftly(softy -> {
                 softy.assertThat(listener.numberOfEventCalls())
                     .isEqualTo(0);
                 assertThat(deadLetter.groupsWithFailedEvents().toStream())
-                    .containsOnly(EventBusTestFixture.GROUP_A);
+                    .containsOnly(GROUP_A);
             });
         }
     }


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