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33 changes: 33 additions & 0 deletions
33
bundle/src/main/java/com/adobe/acs/commons/util/ClusterLeader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /* | ||
| * #%L | ||
| * ACS AEM Commons Bundle | ||
| * %% | ||
| * Copyright (C) 2021 Adobe | ||
| * %% | ||
| * Licensed 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. | ||
| * #L% | ||
| */ | ||
| package com.adobe.acs.commons.util; | ||
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|
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| import org.apache.sling.discovery.DiscoveryService; | ||
| import org.apache.sling.discovery.InstanceDescription; | ||
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| /** | ||
| * Marker interface. | ||
| * Available as OSGi service only on instances being the cluster leader. | ||
| * @see InstanceDescription#isLeader | ||
| * @see DiscoveryService#getTopology | ||
| */ | ||
| public interface ClusterLeader { | ||
|
|
||
| } |
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89 changes: 89 additions & 0 deletions
89
bundle/src/main/java/com/adobe/acs/commons/util/impl/DiscoveryServiceHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /* | ||
| * #%L | ||
| * ACS AEM Commons Bundle | ||
| * %% | ||
| * Copyright (C) 2021 Adobe | ||
| * %% | ||
| * Licensed 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. | ||
| * #L% | ||
| */ | ||
| package com.adobe.acs.commons.util.impl; | ||
|
|
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| import org.apache.sling.discovery.DiscoveryService; | ||
| import org.apache.sling.discovery.TopologyEvent; | ||
| import org.apache.sling.discovery.TopologyEventListener; | ||
| import org.apache.sling.discovery.TopologyView; | ||
| 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; | ||
|
|
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| import com.adobe.acs.commons.util.ClusterLeader; | ||
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| /** | ||
| * This component registers a {@link ClusterLeader} service in case the current topology instance is the leader and | ||
| * unregisters that service if that is no longer the case. | ||
| * | ||
| * Components which are only supposed to be executed on the cluster leader can depend on the | ||
| * service with marker interface {@link ClusterLeader}. | ||
| */ | ||
| @Component | ||
| public class DiscoveryServiceHelper implements TopologyEventListener { | ||
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| @Reference | ||
| DiscoveryService discoveryService; | ||
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| private BundleContext bundleContext; | ||
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| private ServiceRegistration<ClusterLeader> clusterLeaderServiceRegistration; | ||
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| @Override | ||
| public void handleTopologyEvent(TopologyEvent event) { | ||
| TopologyView newView = event.getNewView(); | ||
| if (newView != null) { | ||
| if (newView.getLocalInstance().isLeader()) { | ||
| registerClusterLeader(); | ||
| } else { | ||
| unregisterClusterLeader(); | ||
| } | ||
| } | ||
| } | ||
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| @Activate | ||
| public void activate(BundleContext bundleContext) { | ||
| this.bundleContext = bundleContext; | ||
| if (discoveryService.getTopology().getLocalInstance().isLeader()) { | ||
| registerClusterLeader(); | ||
| } | ||
| } | ||
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| @Deactivate | ||
| public void deactivate() { | ||
| unregisterClusterLeader(); | ||
| } | ||
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| private synchronized void registerClusterLeader() { | ||
| if (clusterLeaderServiceRegistration == null) { | ||
| clusterLeaderServiceRegistration = bundleContext.registerService(ClusterLeader.class, new ClusterLeader() {}, null); | ||
| } | ||
| } | ||
|
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| private synchronized void unregisterClusterLeader() { | ||
| if (clusterLeaderServiceRegistration != null) { | ||
| clusterLeaderServiceRegistration.unregister(); | ||
| clusterLeaderServiceRegistration = null; | ||
| } | ||
| } | ||
| } |
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