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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2016-2021 Payara Foundation and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://github.com/payara/Payara/blob/master/LICENSE.txt
* See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* The Payara Foundation designates this particular file as subject to the "Classpath"
* exception as provided by the Payara Foundation in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
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* If you wish your version of this file to be governed by only the CDDL or
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* elects to include this software in this distribution under the [CDDL or GPL
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* recipient has the option to distribute your version of this file under
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* and therefore, elected the GPL Version 2 license, then the option applies
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*/
package fish.payara.persistence.eclipselink.cache.coordination;
import fish.payara.nucleus.eventbus.ClusterMessage;
import fish.payara.nucleus.eventbus.EventBus;
import fish.payara.nucleus.eventbus.MessageReceiver;
import fish.payara.nucleus.events.HazelcastEvents;
import fish.payara.nucleus.executorservice.PayaraExecutorService;
import org.glassfish.api.StartupRunLevel;
import org.glassfish.api.event.EventListener;
import org.glassfish.api.event.EventTypes;
import org.glassfish.api.event.Events;
import org.glassfish.hk2.runlevel.RunLevel;
import org.jvnet.hk2.annotations.Service;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import jakarta.inject.Inject;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Future;
/**
* Represents a possibility to delay {@link MessageReceiver} registration.
*
* @author Sven Diedrichsen
*/
@Service(name = "hazelcast-topic-storage")
@RunLevel(StartupRunLevel.VAL)
public class HazelcastTopicStorage implements EventListener {
/**
* The singleton instance of the storage.
*/
private static HazelcastTopicStorage storage;
/**
* The message listener cache.
*/
private final Map messageReceiver = new ConcurrentHashMap<>();
/**
* Event bus to propagate cache coordination messages over.
*/
@Inject
private EventBus eventBus;
/**
* Executor to process incoming messages.
*/
@Inject
private PayaraExecutorService executorService;
/**
* System-Events interface.
*/
@Inject
private Events events;
@PostConstruct
public void postConstruct() {
storage = this;
this.events.register(this);
}
@PreDestroy
public void preDestroy() {
storage = null;
this.events.unregister(this);
}
/**
* Returns the singleton instance of this storage.
* @return Singleton storage instance.
*/
public static HazelcastTopicStorage getInstance() {
return storage;
}
@Override
public void event(Event event) {
if (event.is(EventTypes.SERVER_SHUTDOWN)) {
clearMessageReceivers();
} else if(event.is(HazelcastEvents.HAZELCAST_SHUTDOWN_STARTED)) {
unregisterRegisteredReceivers();
} else if(event.is(HazelcastEvents.HAZELCAST_BOOTSTRAP_COMPLETE)) {
registerUnregisteredReceivers();
}
}
/**
* Registers all yet unregistered {@link MessageReceiver}.
*/
private void registerUnregisteredReceivers() {
messageReceiver.values().stream()
.filter(mapping -> !mapping.isRegistered())
.forEach(mapping -> mapping.setRegistered(
eventBus.addMessageReceiver(mapping.getTopic(), mapping.getMessageReceiver())
));
}
/**
* Unregisters all registered {@link MessageReceiver}.
*/
private void unregisterRegisteredReceivers() {
messageReceiver.values().stream()
.filter(ReceiverMapping::isRegistered)
.forEach(mapping -> {
eventBus.removeMessageReceiver(mapping.getTopic(), mapping.getMessageReceiver());
mapping.setRegistered(false);
});
}
/**
* Removing all listeners.
*/
private void clearMessageReceivers() {
messageReceiver.clear();
}
/**
* Processes the submitted work asynchronously.
*
* @param work The work to process.
* @return The {@link Future} representing a handle for the processing.
*/
Future process(final Runnable work) {
return executorService.submit(work);
}
/**
* Tries to register the message listener with the provided topic by its name.
* @param topic The name of the topic to register the listener with.
* @param receiver The receiver to register
* @return The internal id for the registered listener usable for removing the listener.
*/
String registerMessageReceiver(String topic, MessageReceiver receiver) {
ReceiverMapping receiverMapping = new ReceiverMapping(topic, receiver);
receiverMapping.setRegistered(eventBus.addMessageReceiver(topic, receiver));
messageReceiver.put(receiverMapping.getInternalId(), receiverMapping);
return receiverMapping.getInternalId();
}
/**
* Unregisters the listener identified by its internal id for the provided topic.
* @param internalId The internal id identifying the listener.
*/
void removeMessageReceiver(String internalId) {
ReceiverMapping removedReceiver = messageReceiver.remove(internalId);
if (removedReceiver != null) {
eventBus.removeMessageReceiver(removedReceiver.getTopic(), removedReceiver.getMessageReceiver());
}
}
/**
* Publishes the {@link HazelcastPayload} at the topic.
* @param topic The name of the topic to publish the payload.
* @param payload The payload to publish.
*/
void publish(String topic, HazelcastPayload payload) {
eventBus.publish(topic, new ClusterMessage<>(payload));
}
}