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package com.sun.enterprise.jbi.serviceengine.comm;
import com.sun.enterprise.jbi.serviceengine.core.JavaEEServiceEngineContext;
import java.util.HashMap;
import java.util.logging.Level;
import javax.jbi.messaging.ExchangeStatus;
import javax.jbi.messaging.MessageExchange;
import javax.jbi.messaging.MessagingException;
import com.sun.enterprise.jbi.serviceengine.work.OneWork;
/**
* Acceptor object that continuously receives messages from
* NMR. There is one MessageAcceptor object per WorkManager.
*
* MessageAcceptor also keeps a house keeping datastructure
* that holds information about all threads that are waiting
* for reply from on NMR for their two-way message exchange.
*
* @authod Binod PG
*/
public class MessageAcceptor extends OneWork {
private HashMap<String,MessageReceiver> receivers = new HashMap();
private boolean released = false;
/**
* Start the acceptor thread. Note that execute() inturn call
* doWork method, where bulk of logic is present.
*/
public void startAccepting() {
execute();
}
/**
* Add a MessageReceiver object that waits for a reply from
* from NMR on their 2-way message exchange.
*
* @param receiver MessageReceiver instance.
*/
public void register(MessageReceiver receiver) {
String id = receiver.getMessageExchange().getExchangeId();
logger.log(Level.FINER, "Adding recever for " + id);
synchronized (receivers) {
receivers.put(id, receiver);
}
}
/**
* Release the thread from accepting. This method doesnt interrupt
* the thread. It is just a soft release applicable only from the
* next iteration of acceptor thread.
*/
public void release() {
released = true;
}
/**
* Actual work happens in this method. DeliveryChannel available
* from the super class. If there is any MessageReceiver waiting
* for this message, then the MessageExchange is made avalable to that
* MessageReceiver. If no MessageReceiver is interested in this MEP,
* then a new MessageProcessor will process this message.
* In the latter case, the message is for a 109 webservice deployed
* in appserver.
*/
public void doWork() {
while (true) {
try {
MessageExchange me = getDeliveryChannel().accept();
if (released) {
break;
}
if(me != null) {
if(ignoreMessageExchange(me)) {
continue;
}
String id = me.getExchangeId();
// The full block is not synchronized since,
// 1. Id will always be unique
// 2. Service engine will register the receiver
// before sending and hence we wont miss any.
if (receivers.containsKey(id)) {
synchronized(receivers) {
MessageReceiver receiver = receivers.remove(id);
receiver.setMessageExchange(me);
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE,
"Releasing MessageReceiver:" + id + ",MEP :" + me);
}
receiver.release();
}
} else {
MessageProcessor processor =
JavaEEServiceEngineContext.getInstance().
getBridge().getMessageProcessor(me);
processor.setUseCurrentThread(false);
processor.setMessageExchange(me);
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE,
"Spawning MessageProcessorfor MEP :" + me);
}
processor.process();
}
}
} catch (MessagingException ie) {
//Someone has interrupted the acceptor. Gracefully comeout.
logger.log(Level.FINE, "Stopping the acceptor thread");
break;
}
}
}
private boolean ignoreMessageExchange(MessageExchange me) {
if(me.getRole().equals(MessageExchange.Role.PROVIDER)) {
if(me.getStatus().equals(ExchangeStatus.ACTIVE)) {
return false;
}
if(me.getStatus().equals(ExchangeStatus.DONE)) {
if(logger.isLoggable(Level.FINE)) {
logger.fine("Message Exchange Completed " + me);
}
return true;
}
if(me.getStatus().equals(ExchangeStatus.ERROR)) {
logger.warning("JavaEE Service Engine received unsupported Message Exchange " + me);
return true;
}
}
return false;
}
}
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