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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2016-2023 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]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
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*/
package fish.payara.nucleus.eventbus;
import fish.payara.monitoring.collect.MonitoringDataCollector;
import fish.payara.monitoring.collect.MonitoringDataSource;
import fish.payara.nucleus.events.HazelcastEvents;
import fish.payara.nucleus.hazelcast.HazelcastCore;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
import jakarta.annotation.PostConstruct;
import jakarta.inject.Inject;
import org.glassfish.api.StartupRunLevel;
import org.glassfish.api.event.EventListener;
import org.glassfish.api.event.Events;
import org.glassfish.hk2.runlevel.RunLevel;
import org.jvnet.hk2.annotations.Service;
import com.hazelcast.core.DistributedObject;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.topic.LocalTopicStats;
import com.hazelcast.topic.impl.TopicService;
import java.util.UUID;
/**
* A Hazelcast based Event Bus for Payara
* @author steve
* @since 4.1.153
*/
@Service(name = "payara-event-bus")
@RunLevel(StartupRunLevel.VAL)
public class EventBus implements EventListener, MonitoringDataSource {
private static final Logger logger = Logger.getLogger(EventBus.class.getCanonicalName());
@Inject
private HazelcastCore hzCore;
@Inject
private Events events;
private Map messageReceivers;
@PostConstruct
public void postConstruct() {
events.register(this);
messageReceivers = new ConcurrentHashMap<>(2);
}
@Override
public void collect(MonitoringDataCollector rootCollector) {
MonitoringDataCollector eventCollector = rootCollector.in("topic");
if (hzCore.isEnabled()) {
HazelcastInstance hz = hzCore.getInstance();
for (DistributedObject obj : hz.getDistributedObjects()) {
if (TopicService.SERVICE_NAME.equals(obj.getServiceName())) {
LocalTopicStats stats = hz.getTopic(obj.getName()).getLocalTopicStats();
eventCollector.group(obj.getName())
.collect("PublishedCount", stats.getPublishOperationCount())
.collect("ReceiveedCount", stats.getReceiveOperationCount());
}
}
}
}
/**
* Sends out a message to all listeners in the Hazelcast sluster that are
* listening to the topic
* @param topic
* @param message
* @return
*/
public boolean publish(String topic, ClusterMessage message) {
boolean result = false;
if (hzCore.isEnabled()) {
hzCore.getInstance().getTopic(topic).publish(message);
result = true;
}
return result;
}
/**
* Adds a message receiver to listen to message send on the Hazelcast EventBus
* @param topic The name of the topic to recive messages on
* @param mr A {@link MessageReciever} to listen for messages
* @return true if successfully registered, false otherwise (i.e. if Hazelcast
* is not enabled)
*/
@SuppressWarnings("unchecked")
public boolean addMessageReceiver(String topic, MessageReceiver mr) {
boolean result = false;
if (hzCore.isEnabled()) {
TopicListener tl = messageReceivers.get(topic);
if (tl == null) {
// create a topic listener on the specified topic
TopicListener newTL = new TopicListener(topic);
UUID regId = hzCore.getInstance().getTopic(topic).addMessageListener(newTL);
messageReceivers.put(topic, newTL);
tl = newTL;
tl.setRegistrationID(regId);
}
tl.addMessageReceiver(mr);
result = true;
}
return result;
}
/**
* Stops a message receiver from listening to messages on the specified topic
* @param topic The name of the topic that messages have been received on
* @param mr The {@link MessageReciever} to stop listening for messages
*/
public void removeMessageReceiver(String topic, MessageReceiver mr) {
TopicListener tl = messageReceivers.get(topic);
if (tl != null) {
int remaining = tl.removeMessageReceiver(mr);
// for efficiency if we have no message receivers remove our registration
if (remaining == 0) {
messageReceivers.remove(topic);
if (hzCore.isEnabled()) {
hzCore.getInstance().getTopic(topic).removeMessageListener(tl.getRegistrationID());
}
}
}
}
@Override
@SuppressWarnings({"rawtypes", "unchecked"})
public void event(Event event) {
if (event.is(HazelcastEvents.HAZELCAST_BOOTSTRAP_COMPLETE) && hzCore.isEnabled()) {
logger.config("Payara Clustered Event Bus Enabled");
}
}
}