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package org.atmosphere.plugin.jgroups;
import org.atmosphere.util.AbstractBroadcasterProxy;
import org.jgroups.JChannel;
import org.jgroups.Message;
import org.jgroups.ReceiverAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.CountDownLatch;
/**
* Simple {@link org.atmosphere.cpr.Broadcaster} implementation based on JGroups
*
* @author Jeanfrancois Arcand
*/
public class JGroupsBroadcaster extends AbstractBroadcasterProxy {
private static final Logger logger = LoggerFactory.getLogger(JGroupsBroadcaster.class);
private JChannel jchannel;
private String clusterName = "atmosphere-jgroups";
private final CountDownLatch ready = new CountDownLatch(1);
public JGroupsBroadcaster() {
this(JGroupsBroadcaster.class.getSimpleName());
}
public JGroupsBroadcaster(String id) {
this(id, "atmosphere-jgroups");
}
public JGroupsBroadcaster(String id, String clusterName) {
super(id);
this.clusterName = clusterName + "-id";
}
@Override
public void incomingBroadcast() {
try {
logger.info("Starting Atmosphere JGroups Clustering support");
jchannel = new JChannel();
jchannel.setReceiver(new ReceiverAdapter() {
/** {@inheritDoc} */
@Override
public void receive(final Message message) {
final String msg = (String) message.getObject();
if (msg != null) {
broadcastReceivedMessage(msg);
}
}
});
jchannel.connect(clusterName);
}
catch (Throwable t) {
logger.warn("failed to connect to JGroups channel", t);
}
finally {
ready.countDown();
}
}
/**
* {@inheritDoc}
*/
@Override
public void outgoingBroadcast(Object message) {
try {
ready.await();
jchannel.send(new Message(null, null, message.toString()));
}
catch (Throwable e) {
logger.error("failed to send messge over Jgroups channel", e.getMessage());
}
}
/**
* {@inheritDoc}
*/
@Override
public void destroy() {
super.destroy();
jchannel.shutdown();
}
}