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package org.atmosphere.plugin.jms;
import org.atmosphere.cpr.AtmosphereConfig;
import org.atmosphere.util.AbstractBroadcasterProxy;
import com.vaadin.external.org.slf4j.Logger;
import com.vaadin.external.org.slf4j.LoggerFactory;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.naming.Context;
import javax.naming.InitialContext;
/**
* Simple {@link org.atmosphere.cpr.Broadcaster} implementation based on JMS
*
* The {@link ConnectionFactory} name's is jms/atmosphereFactory The
* {@link Topic} by constructing "BroadcasterId =
* {@link org.atmosphere.cpr.Broadcaster#getID}
*
* @author Jeanfrancois Arcand
*/
public class JMSBroadcaster extends AbstractBroadcasterProxy {
private static final String JMS_TOPIC = JMSBroadcaster.class.getName() + ".topic";
private static final String JNDI_NAMESPACE = JMSBroadcaster.class.getName() + ".JNDINamespace";
private static final String JNDI_FACTORY_NAME = JMSBroadcaster.class.getName() + ".JNDIConnectionFactoryName";
private static final String JNDI_TOPIC = JMSBroadcaster.class.getName() + ".JNDITopic";
private static final Logger logger = LoggerFactory.getLogger(JMSBroadcaster.class);
private Connection connection;
private Session consumerSession;
private Session publisherSession;
private Topic topic;
private MessageConsumer consumer;
private MessageProducer publisher;
private String topicId = "atmosphere";
private String factoryName = "atmosphereFactory";
private String namespace = "jms/";
public JMSBroadcaster(String id, AtmosphereConfig config) {
super(id, null, config);
setUp();
}
private void setUp() {
try {
// For backward compatibility.
if (config.getInitParameter(JMS_TOPIC) != null) {
topicId = config.getInitParameter(JMS_TOPIC);
}
if (config.getInitParameter(JNDI_NAMESPACE) != null) {
namespace = config.getInitParameter(JNDI_NAMESPACE);
}
if (config.getInitParameter(JNDI_FACTORY_NAME) != null) {
factoryName = config.getInitParameter(JNDI_FACTORY_NAME);
}
if (config.getInitParameter(JNDI_TOPIC) != null) {
topicId = config.getInitParameter(JNDI_TOPIC);
}
logger.info("Looking up Connection Factory {}", namespace + factoryName);
Context ctx = new InitialContext();
ConnectionFactory connectionFactory = (ConnectionFactory) ctx.lookup(namespace + factoryName);
logger.info("Looking up topic: {}", topicId);
topic = (Topic) ctx.lookup(namespace + topicId);
connection = connectionFactory.createConnection();
consumerSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
publisherSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
publisher = publisherSession.createProducer(topic);
connection.start();
logger.info("JMS created for topic {}", topicId);
// Unfortunately we need the getID() to complete the configuration
// But setID() is called after configure(), therefore we do the
// rest of the configuration in incomingBroadcast() (which is called
// once during configuration). We cannot do all the configuration in
// incomingBroadcast() though, as using bc.getAtmosphereConfig() would
// introduce a race condition (the configuration is loaded in a different
// thread).
} catch (Exception e) {
String msg = "Unable to configure JMSBroadcaster";
logger.error(msg, e);
throw new RuntimeException(msg, e);
}
}
/**
* {@inheritDoc}
*/
@Override
public void incomingBroadcast() {
// we setup the consumer in the setID method. No need to do it here too
}
@Override
public void setID(String id) {
super.setID(id);
restartConsumer();
}
void restartConsumer() {
try {
String id = getID();
if (id.startsWith("/*")) {
id = "atmosphere";
}
if (consumer != null) {
consumer.close();
consumer = null;
}
logger.info("Create JMS consumer: {}", id);
String selector = String.format("BroadcasterId = '%s'", id);
consumer = consumerSession.createConsumer(topic, selector);
consumer.setMessageListener(new MessageListener() {
@Override
public void onMessage(Message msg) {
try {
TextMessage textMessage = (TextMessage) msg;
String message = textMessage.getText();
if (message != null && bc != null) {
broadcastReceivedMessage(message);
}
} catch (JMSException ex) {
logger.warn("Failed to broadcast message", ex);
}
}
});
logger.info("Consumer created for topic {}, with filter {}",
topicId, selector);
} catch (Throwable ex) {
String msg = "Unable to initialize JMSBroadcaster";
logger.error(msg, ex);
throw new IllegalStateException(msg, ex);
}
}
/**
* {@inheritDoc}
*/
@Override
public void outgoingBroadcast(Object message) {
try {
String id = getID();
if (id.startsWith("/*")) {
id = "atmosphere";
}
if (publisherSession == null) {
throw new IllegalStateException("JMS Session is null");
}
TextMessage textMessage = publisherSession.createTextMessage(message
.toString());
textMessage.setStringProperty("BroadcasterId", id);
publisher.send(textMessage);
} catch (JMSException ex) {
logger.warn("Failed to send message over JMS", ex);
}
}
/**
* Close all related JMS factory, connection, etc.
*/
@Override
public synchronized void releaseExternalResources() {
try {
connection.close();
consumerSession.close();
publisherSession.close();
consumer.close();
publisher.close();
} catch (Throwable ex) {
logger.warn("releaseExternalResources", ex);
}
}
}
