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A JCA Resource Adapter used to integrate ActiveMQ with transactional enterprise containers
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/**
* 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.activemq.ra;
import java.lang.reflect.Method;
import java.util.concurrent.atomic.AtomicBoolean;
import jakarta.jms.Connection;
import jakarta.jms.ConnectionConsumer;
import jakarta.jms.ExceptionListener;
import jakarta.jms.JMSException;
import jakarta.jms.Message;
import jakarta.jms.MessageListener;
import jakarta.jms.Session;
import jakarta.jms.Topic;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import jakarta.resource.ResourceException;
import jakarta.resource.spi.endpoint.MessageEndpointFactory;
import jakarta.resource.spi.work.Work;
import jakarta.resource.spi.work.WorkException;
import jakarta.resource.spi.work.WorkManager;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionConsumer;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* $Date$
*/
public class ActiveMQEndpointWorker {
public static final Method ON_MESSAGE_METHOD;
private static final Logger LOG = LoggerFactory.getLogger(ActiveMQEndpointWorker.class);
private static final long INITIAL_RECONNECT_DELAY = 1000; // 1 second.
private static final long MAX_RECONNECT_DELAY = 1000 * 30; // 30 seconds.
private static final ThreadLocal THREAD_LOCAL = new ThreadLocal();
static {
try {
ON_MESSAGE_METHOD = MessageListener.class.getMethod("onMessage", new Class[] {
Message.class
});
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
protected final ActiveMQEndpointActivationKey endpointActivationKey;
protected final MessageEndpointFactory endpointFactory;
protected final WorkManager workManager;
protected final boolean transacted;
private final ActiveMQDestination dest;
private final Work connectWork;
private final AtomicBoolean connecting = new AtomicBoolean(false);
private final Object shutdownMutex = new String("shutdownMutex");
private ActiveMQConnection connection;
private ActiveMQConnectionConsumer consumer;
private ServerSessionPoolImpl serverSessionPool;
private boolean running;
protected ActiveMQEndpointWorker(final MessageResourceAdapter adapter, ActiveMQEndpointActivationKey key) throws ResourceException {
this.endpointActivationKey = key;
this.endpointFactory = endpointActivationKey.getMessageEndpointFactory();
this.workManager = adapter.getBootstrapContext().getWorkManager();
try {
this.transacted = endpointFactory.isDeliveryTransacted(ON_MESSAGE_METHOD);
} catch (NoSuchMethodException e) {
throw new ResourceException("Endpoint does not implement the onMessage method.");
}
connectWork = new Work() {
long currentReconnectDelay = INITIAL_RECONNECT_DELAY;
public void release() {
//
}
public void run() {
currentReconnectDelay = INITIAL_RECONNECT_DELAY;
MessageActivationSpec activationSpec = endpointActivationKey.getActivationSpec();
if (LOG.isInfoEnabled()) {
LOG.info("Establishing connection to broker [" + adapter.getInfo().getServerUrl() + "]");
}
while (connecting.get() && running) {
try {
connection = adapter.makeConnection(activationSpec);
connection.setExceptionListener(new ExceptionListener() {
public void onException(JMSException error) {
if (!serverSessionPool.isClosing()) {
// initiate reconnection only once, i.e. on initial exception
// and only if not already trying to connect
LOG.error("Connection to broker failed: " + error.getMessage(), error);
if (connecting.compareAndSet(false, true)) {
synchronized (connectWork) {
disconnect();
serverSessionPool.closeSessions();
connect();
}
} else {
// connection attempt has already been initiated
LOG.info("Connection attempt already in progress, ignoring connection exception");
}
}
}
});
connection.start();
if (activationSpec.isDurableSubscription()) {
consumer = (ActiveMQConnectionConsumer) connection.createDurableConnectionConsumer(
(Topic) dest,
activationSpec.getSubscriptionName(),
emptyToNull(activationSpec.getMessageSelector()),
serverSessionPool,
connection.getPrefetchPolicy().getDurableTopicPrefetch(),
activationSpec.getNoLocalBooleanValue());
} else {
consumer = (ActiveMQConnectionConsumer) connection.createConnectionConsumer(
dest,
emptyToNull(activationSpec.getMessageSelector()),
serverSessionPool,
getPrefetch(activationSpec, connection, dest),
activationSpec.getNoLocalBooleanValue());
}
if (connecting.compareAndSet(true, false)) {
if (LOG.isInfoEnabled()) {
LOG.info("Successfully established connection to broker [" + adapter.getInfo().getServerUrl() + "]");
}
} else {
LOG.error("Could not release connection lock");
}
if (consumer.getConsumerInfo().getCurrentPrefetchSize() == 0) {
LOG.error("Endpoint " + endpointActivationKey.getActivationSpec() + " will not receive any messages due to broker 'zero prefetch' configuration for: " + dest);
}
} catch (JMSException error) {
if (LOG.isDebugEnabled()) {
LOG.debug("Failed to connect: " + error.getMessage(), error);
}
disconnect();
pause(error);
}
}
}
private int getPrefetch(MessageActivationSpec activationSpec, ActiveMQConnection connection, ActiveMQDestination destination) {
if (destination.isTopic()) {
return connection.getPrefetchPolicy().getTopicPrefetch();
} else if (destination.isQueue()) {
return connection.getPrefetchPolicy().getQueuePrefetch();
} else {
return activationSpec.getMaxMessagesPerSessionsIntValue() * activationSpec.getMaxSessionsIntValue();
}
}
private void pause(JMSException error) {
if (currentReconnectDelay == MAX_RECONNECT_DELAY) {
LOG.error("Failed to connect to broker [" + adapter.getInfo().getServerUrl() + "]: "
+ error.getMessage(), error);
LOG.error("Endpoint will try to reconnect to the JMS broker in " + (MAX_RECONNECT_DELAY / 1000) + " seconds");
}
try {
synchronized ( shutdownMutex ) {
// shutdownMutex will be notified by stop() method in
// order to accelerate shutdown of endpoint
shutdownMutex.wait(currentReconnectDelay);
}
} catch ( InterruptedException e ) {
Thread.interrupted();
}
currentReconnectDelay *= 2;
if (currentReconnectDelay > MAX_RECONNECT_DELAY) {
currentReconnectDelay = MAX_RECONNECT_DELAY;
}
}
};
MessageActivationSpec activationSpec = endpointActivationKey.getActivationSpec();
if (activationSpec.isUseJndi()) {
try {
InitialContext initialContext = new InitialContext();
dest = (ActiveMQDestination) initialContext.lookup(activationSpec.getDestination());
}
catch (NamingException exc) {
throw new ResourceException("JNDI lookup failed for "
+ activationSpec.getDestination());
}
}
else {
if ("jakarta.jms.Queue".equals(activationSpec.getDestinationType())) {
dest = new ActiveMQQueue(activationSpec.getDestination());
}
else if ("jakarta.jms.Topic".equals(activationSpec.getDestinationType())) {
dest = new ActiveMQTopic(activationSpec.getDestination());
}
else {
throw new ResourceException("Unknown destination type: "
+ activationSpec.getDestinationType());
}
}
}
/**
* @param c
*/
public static void safeClose(Connection c) {
try {
if (c != null) {
LOG.debug("Closing connection to broker");
c.close();
}
} catch (JMSException e) {
LOG.trace("failed to close c {}", c, e);
}
}
/**
* @param cc
*/
public static void safeClose(ConnectionConsumer cc) {
try {
if (cc != null) {
LOG.debug("Closing ConnectionConsumer");
cc.close();
}
} catch (JMSException e) {
LOG.trace("failed to close cc {}", cc, e);
}
}
/**
*
*/
public void start() throws ResourceException {
synchronized (connectWork) {
if (running)
return;
running = true;
if ( connecting.compareAndSet(false, true) ) {
LOG.info("Starting");
serverSessionPool = new ServerSessionPoolImpl(this, endpointActivationKey.getActivationSpec().getMaxSessionsIntValue());
connect();
} else {
LOG.warn("Ignoring start command, EndpointWorker is already trying to connect");
}
}
}
/**
*
*/
public void stop() throws InterruptedException {
synchronized (shutdownMutex) {
if (!running)
return;
running = false;
LOG.info("Stopping");
// wake up pausing reconnect attempt
shutdownMutex.notifyAll();
try {
serverSessionPool.close();
} catch (Throwable ignored) {
LOG.debug("Unexpected error on server session pool close", ignored);
}
}
disconnect();
}
private boolean isRunning() {
return running;
}
private void connect() {
synchronized ( connectWork ) {
if (!running) {
return;
}
try {
workManager.scheduleWork(connectWork, WorkManager.INDEFINITE, null, null);
} catch (WorkException e) {
running = false;
LOG.error("Work Manager did not accept work: ", e);
}
}
}
/**
*
*/
private void disconnect() {
synchronized ( connectWork ) {
safeClose(consumer);
consumer = null;
safeClose(connection);
connection = null;
}
}
protected void registerThreadSession(Session session) {
THREAD_LOCAL.set(session);
}
protected void unregisterThreadSession(Session session) {
THREAD_LOCAL.set(null);
}
// for testing
public void setConnection(ActiveMQConnection activeMQConnection) {
this.connection = activeMQConnection;
}
protected ActiveMQConnection getConnection() {
// make sure we only return a working connection
// in particular make sure that we do not return null
// after the resource adapter got disconnected from
// the broker via the disconnect() method
synchronized ( connectWork ) {
return connection;
}
}
private String emptyToNull(String value) {
if (value == null || value.length() == 0) {
return null;
}
return value;
}
}
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