[james-project] 02/09: JAMES-3885 Service to change of username

[bt...@apache.org]

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

commit 7ece066f1dbb16bbe521146216618eb3c7c112c5
Author: Benoit Tellier <bt...@linagora.com>
AuthorDate: Thu Feb 16 15:32:07 2023 +0700

    JAMES-3885 Service to change of username
    
    Plugs steps together, running them one after the
    other and provides ordering of steps, execution tacking.
    
    Stops at first failed steps and aborts the following
    steps.
---
 .../webadmin/service/UsernameChangeService.java    | 117 +++++++++++++++++++++
 1 file changed, 117 insertions(+)

diff --git a/server/protocols/webadmin/webadmin-data/src/main/java/org/apache/james/webadmin/service/UsernameChangeService.java b/server/protocols/webadmin/webadmin-data/src/main/java/org/apache/james/webadmin/service/UsernameChangeService.java
new file mode 100644
index 0000000000..6e87f8aab1
--- /dev/null
+++ b/server/protocols/webadmin/webadmin-data/src/main/java/org/apache/james/webadmin/service/UsernameChangeService.java
@@ -0,0 +1,117 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *   http://www.apache.org/licenses/LICENSE-2.0                 *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.webadmin.service;
+
+import java.util.Comparator;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import javax.inject.Inject;
+
+import org.apache.james.core.Username;
+import org.apache.james.user.api.UsernameChangeTaskStep;
+
+import com.google.common.collect.ImmutableMap;
+
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+public class UsernameChangeService {
+    public enum StepState {
+        WAITING,
+        IN_PROGRESS,
+        DONE,
+        FAILED,
+        ABORTED
+    }
+
+    public static class UsernameChangeStatus {
+        private final Map<UsernameChangeTaskStep.StepName, StepState> states;
+
+        public UsernameChangeStatus(Set<UsernameChangeTaskStep> steps) {
+            states = new ConcurrentHashMap<>(steps.stream()
+                .collect(ImmutableMap.toImmutableMap(step -> step.name(), any -> StepState.WAITING)));
+        }
+
+        public void beginStep(UsernameChangeTaskStep.StepName step) {
+            states.put(step, StepState.IN_PROGRESS);
+        }
+
+        public void endStep(UsernameChangeTaskStep.StepName step) {
+            states.put(step, StepState.DONE);
+        }
+
+        public void failedStep(UsernameChangeTaskStep.StepName step) {
+            states.put(step, StepState.FAILED);
+        }
+
+        public void abortStep(UsernameChangeTaskStep.StepName step) {
+            states.put(step, StepState.ABORTED);
+        }
+
+        public void abort() {
+            states.entrySet()
+                .stream()
+                .filter(entry -> entry.getValue() == StepState.WAITING || entry.getValue() == StepState.IN_PROGRESS)
+                .forEach(entry -> abortStep(entry.getKey()));
+        }
+
+        public Map<UsernameChangeTaskStep.StepName, StepState> getStates() {
+            return ImmutableMap.copyOf(states);
+        }
+    }
+
+    public static class Performer {
+        private final Set<UsernameChangeTaskStep> steps;
+        private final UsernameChangeStatus status;
+
+        public Performer(Set<UsernameChangeTaskStep> steps, UsernameChangeStatus status) {
+            this.steps = steps;
+            this.status = status;
+        }
+
+        public Mono<Void> changeUsername(Username oldUsername, Username newUsername) {
+            return Flux.fromIterable(steps)
+                .sort(Comparator.comparingInt(UsernameChangeTaskStep::priority))
+                .concatMap(step -> Mono.fromRunnable(() -> status.beginStep(step.name()))
+                    .then(Mono.from(step.changeUsername(oldUsername, newUsername)))
+                    .then(Mono.fromRunnable(() -> status.endStep(step.name())))
+                    .doOnError(e -> status.failedStep(step.name())))
+                .doOnError(e -> status.abort())
+                .then();
+        }
+
+        public UsernameChangeStatus getStatus() {
+            return status;
+        }
+    }
+
+    private final Set<UsernameChangeTaskStep> steps;
+
+    @Inject
+    public UsernameChangeService(Set<UsernameChangeTaskStep> steps) {
+        this.steps = steps;
+    }
+
+    public Performer performer() {
+        return new Performer(steps, new UsernameChangeStatus(steps));
+    }
+}


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