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SimpleQueueReceiver.java
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SimpleQueueReceiver.java
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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.
*/
/**
* The SimpleQueueReceiver class consists only of a main method,
* which fetches one or more messages from a queue using
* synchronous message delivery. Run this program in conjunction
* with SimpleQueueSender. Specify a queue name on the command
* line when you run the program.
*/
package org.apache.activemq.demo;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class SimpleQueueReceiver {
private static final Logger LOG = LoggerFactory.getLogger(SimpleQueueReceiver.class);
private SimpleQueueReceiver() {
}
/**
* Main method.
*
* @param args the queue used by the example
*/
public static void main(String[] args) {
String queueName = null;
Context jndiContext = null;
QueueConnectionFactory queueConnectionFactory = null;
QueueConnection queueConnection = null;
QueueSession queueSession = null;
Queue queue = null;
QueueReceiver queueReceiver = null;
TextMessage message = null;
/*
* Read queue name from command line and display it.
*/
if (args.length != 1) {
LOG.info("Usage: java " + "SimpleQueueReceiver <queue-name>");
System.exit(1);
}
queueName = args[0];
LOG.info("Queue name is " + queueName);
/*
* Create a JNDI API InitialContext object if none exists yet.
*/
try {
jndiContext = new InitialContext();
} catch (NamingException e) {
LOG.info("Could not create JNDI API " + "context: " + e.toString());
System.exit(1);
}
/*
* Look up connection factory and queue. If either does not exist, exit.
*/
try {
queueConnectionFactory = (QueueConnectionFactory) jndiContext.lookup("QueueConnectionFactory");
queue = (Queue) jndiContext.lookup(queueName);
} catch (NamingException e) {
LOG.info("JNDI API lookup failed: " + e.toString());
System.exit(1);
}
/*
* Create connection. Create session from connection; false means
* session is not transacted. Create receiver, then start message
* delivery. Receive all text messages from queue until a non-text
* message is received indicating end of message stream. Close
* connection.
*/
try {
queueConnection = queueConnectionFactory.createQueueConnection();
queueSession = queueConnection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
queueReceiver = queueSession.createReceiver(queue);
queueConnection.start();
while (true) {
Message m = queueReceiver.receive(1);
if (m != null) {
if (m instanceof TextMessage) {
message = (TextMessage) m;
LOG.info("Reading message: " + message.getText());
} else {
break;
}
}
}
} catch (JMSException e) {
LOG.info("Exception occurred: " + e.toString());
} finally {
if (queueConnection != null) {
try {
queueConnection.close();
} catch (JMSException e) {
}
}
}
}
}