[GitHub] [sling-org-apache-sling-distribution-journal] balasoiuroxana commented on a change in pull request #99: SLING-10077: Mode to raise events only locally

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balasoiuroxana commented on a change in pull request #99:
URL: https://github.com/apache/sling-org-apache-sling-distribution-journal/pull/99#discussion_r812018723



##########
File path: src/main/java/org/apache/sling/distribution/journal/impl/publisher/DistributedEventNotifierManager.java
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@@ -0,0 +1,136 @@
+/*
+ * 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.sling.distribution.journal.impl.publisher;
+
+import org.apache.sling.api.resource.ResourceResolverFactory;
+import org.apache.sling.discovery.TopologyEvent;
+import org.apache.sling.discovery.TopologyEventListener;
+import org.apache.sling.distribution.journal.MessagingProvider;
+import org.apache.sling.distribution.journal.impl.discovery.TopologyChangeHandler;
+import org.apache.sling.distribution.journal.queue.PubQueueProvider;
+import org.apache.sling.distribution.journal.shared.Topics;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceRegistration;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.event.EventAdmin;
+import org.osgi.service.metatype.annotations.AttributeDefinition;
+import org.osgi.service.metatype.annotations.Designate;
+import org.osgi.service.metatype.annotations.ObjectClassDefinition;
+
+import java.util.Hashtable;
+
+import static org.apache.sling.discovery.TopologyEvent.Type;
+import static org.apache.sling.discovery.TopologyEvent.Type.*;
+
+@Component(immediate = true, service = TopologyEventListener.class)
+@Designate(ocd = DistributedEventNotifierManager.Configuration.class)
+public class DistributedEventNotifierManager implements TopologyEventListener {
+
+    /*
+     * Register the package distributed event notifier service
+     * on all or only the leader instance in a cluster according
+     * to the configuration.
+     */
+
+    @Reference
+    private EventAdmin eventAdmin;
+
+    @Reference
+    private PubQueueProvider pubQueueCacheService;
+
+    @Reference
+    private MessagingProvider messagingProvider;
+
+    @Reference
+    private Topics topics;
+
+    @Reference
+    private ResourceResolverFactory resolverFactory;
+
+    private ServiceRegistration<TopologyChangeHandler> reg;
+
+    private BundleContext context;
+
+    private Configuration config;
+
+    private boolean isLeader;

Review comment:
       I used `isLeader` only for testing and its purpose is a little different from (reg != null), because if we have the default config, reg is not null although the instance can be or not the leader . 




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