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POSingle queue: concurrent message processing with multiple consumers
 

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    <p>I am new to jms. The goal is to process messages concurrently from a queue in an asynchronous listener's onMessage method by attaching a listener instance to multiple consumer's with each consumer using its own session and running in a separate thread, that way the messages are passed on to the different consumers for concurrent processing. </p> <p>1) Is it possible to process messages concurrently from a single queue by creating multiple consumers ? 2) I came up with the below code, but would like to get your thoughts on whether the below code looks correct for what I want to accomplish. </p> <pre><code>public class QueueConsumer implements Runnable, MessageListener { public static void main(String[] args) { QueueConsumer consumer1 = new QueueConsumer(); QueueConsumer consumer2 = new QueueConsumer(); try { consumer1.init("oms", "US.Q.CHECKOUT-ORDER.1.0.JSON"); consumer2.init("oms","US.Q.CHECKOUT-ORDER.1.0.JSON"); } catch (JMSException ex) { ex.printStackTrace(); System.exit(-1); } Thread newThread1 = new Thread(consumer1); Thread newThread2 = new Thread(consumer1); newThread1.start(); newThread2.start(); } private static String connectionFactoryName = null; private static String queueName = null; private static ConnectionFactory qcf = null; private static Connection queueConnection = null; private Session ses = null; private Destination queue = null; private MessageConsumer msgConsumer = null; public static final Logger logger = LoggerFactory .getLogger(QueueConsumer.class); public QueueConsumer() { super(); } public void onMessage(Message msg) { if (msg instanceof TextMessage) { try { //process message } catch (JMSException ex) { ex.printStackTrace(); } } } public void run() { try { queueConnection.start(); } catch (JMSException e) { e.printStackTrace(); System.exit(-1); } while (!Thread.currentThread().isInterrupted()) { synchronized (this) { try { wait(); } catch (InterruptedException ex) { break; } } } } public void init(String factoryName, String queue2) throws JMSException { try { qcf = new JMSConnectionFactory(factoryName); queueConnection = qcf.createConnection(); ses = queueConnection.createSession(false, Session.CLIENT_ACKNOWLEDGE); queue = ses.createQueue(queue2); logger.info("Subscribing to destination: " + queue2); msgConsumer = ses.createConsumer(queue); msgConsumer.setMessageListener(this); System.out.println("Listening on queue " + queue2); } catch (Exception e) { e.printStackTrace(); System.exit(-1); } } private static void setConnectionFactoryName(String name) { connectionFactoryName = name; } private static String getQueueName() { return queueName; } private static void setQueueName(String name) { queueName = name; } </code></pre> <p>}</p>
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