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Micro Distribution of the Payara Project
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2016-2022 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 ex.getCause()this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
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* recipient has the option to distribute your version of this file under
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*/
package fish.payara.micro.cdi.extension;
import fish.payara.micro.cdi.Outbound;
import fish.payara.micro.cdi.Inbound;
import fish.payara.micro.cdi.ClusteredCDIEventBus;
import fish.payara.appserver.micro.services.PayaraClusteredCDIEventImpl;
import fish.payara.micro.event.CDIEventListener;
import fish.payara.micro.event.PayaraClusteredCDIEvent;
import fish.payara.micro.PayaraInstance;
import java.io.IOException;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import jakarta.enterprise.concurrent.ManagedExecutorService;
import jakarta.enterprise.context.ApplicationScoped;
import jakarta.enterprise.context.Initialized;
import jakarta.enterprise.event.Observes;
import jakarta.enterprise.inject.spi.BeanManager;
import jakarta.enterprise.inject.spi.EventMetadata;
import jakarta.inject.Inject;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.glassfish.internal.api.Globals;
import org.glassfish.internal.api.JavaEEContextUtil;
import org.glassfish.internal.api.JavaEEContextUtil.Context;
/**
*
* @author Steve Millidge (Payara Services Limited)
*/
@ApplicationScoped
public class ClusteredCDIEventBusImpl implements CDIEventListener, ClusteredCDIEventBus {
@Inject
private PayaraInstance runtime;
@Inject
private BeanManager bm;
private ManagedExecutorService managedExecutorService;
private JavaEEContextUtil.Instance ctxUtil;
private final static String INSTANCE_PROPERTY = "InstanceName";
private final static String EVENT_PROPERTY = "EventName";
@PostConstruct
void postConstruct() {
ctxUtil = Globals.getDefaultHabitat().getService(JavaEEContextUtil.class).currentInvocation();
try {
InitialContext ctx = new InitialContext();
managedExecutorService = (ManagedExecutorService) ctx.lookup("java:comp/DefaultManagedExecutorService");
} catch (NamingException ex) {
throw new RuntimeException(ex);
}
runtime.addCDIListener(this);
if (runtime.isClustered()) {
Logger.getLogger(ClusteredCDIEventBusImpl.class.getName()).log(Level.INFO, "Clustered CDI Event bus initialized");
}
}
@PreDestroy
void preDestroy() {
runtime.removeCDIListener(this);
}
public void onStart(@Observes @Initialized(ApplicationScoped.class) Object init) {
}
@Override
public void initialize() {
// deprecated now
}
@Override
public void eventReceived(final PayaraClusteredCDIEvent event) {
// first check if the event is targetted at a specific instance
String instanceName = event.getProperty(INSTANCE_PROPERTY);
if (!(instanceName == null) && !(instanceName.length() == 0) ) {
// there is an instance name filter
String names[] = deserializeToArray(instanceName);
boolean forUs = false;
String thisInstance = runtime.getInstanceName();
for (String name : names) {
if (name.equals(thisInstance)) {
forUs = true;
break;
}
}
if (!forUs)
return;
}
try(Context ctx = ctxUtil.pushContext()) {
managedExecutorService.submit(() -> {
try (final Context ctx1 = ctxUtil.setApplicationClassLoader()) {
// create the set of qualifiers for the event
// first add Inbound qualifier with the correct properties
Set qualifiers = new HashSet<>();
Serializable eventPayload = event.getPayload();
Inbound inbound = new Inbound() {
@Override
public String eventName() {
return event.getProperty(EVENT_PROPERTY);
}
@Override
public Class annotationType() {
return Inbound.class;
}
};
qualifiers.add(inbound);
// Now create Qualifiers for the sent event qualifiers
Set receivedQualifiers = event.getQualifiers();
for (Annotation receivedQualifier : receivedQualifiers) {
// strip out OutBound as we don't want it even though it was sent over
if (!(receivedQualifier instanceof Outbound)) {
qualifiers.add(receivedQualifier);
}
}
Annotation annotations[] = qualifiers.toArray(new Annotation[0]);
bm.getEvent().select(annotations).fire(eventPayload);
// todo review what to do with this, Do I need to replace with something new?
} catch (IOException | ClassNotFoundException ex) {
Logger.getLogger(ClusteredCDIEventBusImpl.class.getName())
.log(ex.getCause() instanceof IllegalStateException ? Level.FINE : Level.INFO,
"Received Event but could not process it", ex);
}
});
}
}
void onOutboundEvent(@Observes @Outbound Serializable event, EventMetadata meta) throws IOException {
PayaraClusteredCDIEvent clusteredEvent;
// read the metadata on the Outbound Annotation to set data into the event
boolean loopBack = false;
String eventName = "";
String[] instanceName = new String[0];
for (Annotation annotation : meta.getQualifiers()) {
if (annotation instanceof Outbound) {
Outbound outboundattn = (Outbound) annotation;
eventName = outboundattn.eventName();
loopBack = outboundattn.loopBack();
instanceName = outboundattn.instanceName();
}
}
clusteredEvent = new PayaraClusteredCDIEventImpl(runtime.getLocalDescriptor(), event);
clusteredEvent.setLoopBack(loopBack);
clusteredEvent.setProperty(EVENT_PROPERTY, eventName);
clusteredEvent.setProperty(INSTANCE_PROPERTY, serializeArray(instanceName));
Set qualifiers = meta.getQualifiers();
if (qualifiers != null && !qualifiers.isEmpty()) {
clusteredEvent.addQualifiers(qualifiers);
}
runtime.publishCDIEvent(clusteredEvent);
}
private static final String ITEM_SEPARATOR = ",,,"; // 3 commas in case an instance name contains a comma
// the same could be done in one line just with String.join() in JDK8
private static String serializeArray(String[] items) {
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String name : items) {
if (first) {
first = false;
} else {
sb.append(ITEM_SEPARATOR);
}
sb.append(name);
}
return sb.toString();
}
private String[] deserializeToArray(String serializedItems) {
return serializedItems.split(ITEM_SEPARATOR);
}
}