/**
* Receives a message from the given blocking queue, waiting up to the given timeout value.
*
* @param queue the queue from which to consume
* @param timeout greater than 0 to wait the given number of milliseconds, 0 for unlimited
* blocking wait, less than zero for no wait
* @return the message received or null if no message was received
* @throws JMSException
*/
protected Message receive(BlockingQueue<byte[]> queue, long timeout) throws JMSException {
// Figure out the receive strategy.
ReceiveStrategy receiver = null;
if (timeout < 0) {
receiver = new IndefiniteBlockingReceive();
} else {
receiver = new TimedBlockingReceive(timeout);
}
Message msg = null;
do {
synchronized (STOP_GUARD) {
try {
byte[] msgData = receiver.receive(queue);
// Check that we got message data
if (msgData != null) {
// Convert the message data back into a JMS message
msg = messageMarshaller.toMessage(msgData);
// Switch Bytes messages to read mode
if (msg instanceof BytesMessage) {
((BytesMessage) msg).reset();
}
// Check for message expiration
long expirationTime = msg.getJMSExpiration();
if (expirationTime != 0 && expirationTime <= System.currentTimeMillis()) {
log.info(
format("Dropping message [%s] because it has expired.", msg.getJMSMessageID()));
msg = null;
}
}
} catch (InterruptedException ex) {
throw new JMSException("Error receiving message: " + ex.getMessage());
} catch (IOException ex) {
throw new JMSException("Error receiving message: " + ex.getMessage());
}
}
} while (msg == null && receiver.isRetryable());
return msg;
}
public void onMessage(Message message) {
if (message instanceof TextMessage) {
TextMessage msg = (TextMessage) message;
try {
String unitOfOrder = message.getStringProperty("JMS_BEA_UnitOfOrder");
// Sleep for 2 seconds to demonstrate the messages are indeed
// processes sequentially (in unit-of-order)
Thread.sleep(2000);
System.out.println(
"UOOListener:: MDB=["
+ mdbId
+ "] UOO=["
+ unitOfOrder
+ "] Message=["
+ msg.getText()
+ "]");
} catch (JMSException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
