深入掌握JMS(十):JMSCorrelationID与Selector

本文介绍了一个关于 JMS CorrelationID 的实战案例,演示了如何利用 JMS CorrelationID 在消息中间件中实现消息的发送与回复功能。通过三个生产者与三个消费者之间的交互过程,展示了如何设置和使用 JMS CorrelationID 来确保消息能够准确地被发送方接收。

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        前面讲过JMSCorrelationID主要是用来关联多个Message,例如需要回复一个消息的时候,通常把回复的消息的JMSCorrelationID设置为原来消息的ID。

        在下面这个例子中,创建了三个消息生产者A,B,C和三个消息消费者A,B,C。生产者A给消费者A发送一个消息,同时需要消费者A给它回复一个消息。B、C与A类似。 

        简图如下: 

生产者A-----发送----〉消费者A-----回复------〉生产者A 
生产者B-----发送----〉消费者B-----回复------〉生产者B 
生产者C-----发送----〉消费者C-----回复------〉生产者C

        需要注意的是,所有的发送和回复都使用同一个Queue,通过Selector区分。

package com.bijian.study;

import javax.jms.*;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;

public class JMSCorrelationIDTest {
	
	private Queue queue;
	private Session session;

	public JMSCorrelationIDTest() throws JMSException {
		
		ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
		Connection connection = factory.createConnection();
		connection.start();
		
		queue = new ActiveMQQueue("testQueue");
		session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
		setupConsumer("ConsumerA");
		setupConsumer("ConsumerB");
		setupConsumer("ConsumerC");
		setupProducer("ProducerA", "ConsumerA");
		setupProducer("ProducerB", "ConsumerB");
		setupProducer("ProducerC", "ConsumerC");
	}

	private void setupConsumer(final String name) throws JMSException {
		
		// 创建一个消费者,它只接受属于它自己的消息
		MessageConsumer consumer = session.createConsumer(queue, "receiver='" + name + "'");
		
		consumer.setMessageListener(new MessageListener() {
			public void onMessage(Message m) {
				try {
					MessageProducer producer = session.createProducer(queue);
					System.out.println(name + " get:" + ((TextMessage) m).getText());
					// 回复一个消息
					Message replyMessage = session.createTextMessage("Reply from " + name);
					// 设置JMSCorrelationID为刚才收到的消息的ID
					replyMessage.setJMSCorrelationID(m.getJMSMessageID());
					producer.send(replyMessage);
				} catch (JMSException e) {
				}
			}
		});
	}

	private void setupProducer(final String name, String consumerName) throws JMSException {
		
		MessageProducer producer = session.createProducer(queue);
		producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
		// 创建一个消息,并设置一个属性receiver,为消费者的名字
		Message message = session.createTextMessage("Message from " + name);
		message.setStringProperty("receiver", consumerName);
		producer.send(message);
		
		// 等待回复的消息
		MessageConsumer replyConsumer = session.createConsumer(queue, "JMSCorrelationID='" + message.getJMSMessageID() + "'");
		replyConsumer.setMessageListener(new MessageListener() {
			public void onMessage(Message m) {
				try {
					System.out.println(name + " get reply:" + ((TextMessage) m).getText());
				} catch (JMSException e) {
				}
			}
		});
	}

	public static void main(String[] args) throws Exception {
		new JMSCorrelationIDTest();
	}
}

        运行结果为: 

ConsumerA get:Message from ProducerA
ProducerA get reply:Reply from ConsumerA
ConsumerB get:Message from ProducerB
ProducerB get reply:Reply from ConsumerB
ConsumerC get:Message from ProducerC
ProducerC get reply:Reply from ConsumerC

 

文章来源:http://www.cnblogs.com/guthing/archive/2010/06/12/1757179.html

基于Java通讯开发jms源代码 (jms通讯开发源码) java,net,socket,通讯开发,jms /* * @(#)Message.java 1.60 02/04/09 * * Copyright 1997-2002 Sun Microsystems, Inc. All Rights Reserved. * * SUN PROPRIETARY/CONFIDENTIAL. * This software is the proprietary information of Sun Microsystems, Inc. * Use is subject to license terms. * */ import java.util.Enumeration; public interface Message { String getJMSMessageID() throws JMSException; void setJMSMessageID(String id) throws JMSException; long getJMSTimestamp() throws JMSException; void setJMSTimestamp(long timestamp) throws JMSException; byte [] getJMSCorrelationIDAsBytes() throws JMSException; void setJMSCorrelationIDAsBytes(byte[] correlationID) throws JMSException; String getJMSCorrelationID() throws JMSException; Destination getJMSReplyTo() throws JMSException; void setJMSReplyTo(Destination replyTo) throws JMSException; Destination getJMSDestination() throws JMSException; void setJMSDestination(Destination destination) throws JMSException; int getJMSDeliveryMode() throws JMSException; void setJMSDeliveryMode(int deliveryMode) throws JMSException; boolean getJMSRedelivered() throws JMSException; void setJMSRedelivered(boolean redelivered) throws JMSException; String getJMSType() throws JMSException; void setJMSType(String type) throws JMSException; long getJMSExpiration() throws JMSException; void setJMSExpiration(long expiration) throws JMSException; int getJMSPriority() throws JMSException; void setJMSPriority(int priority) throws JMSException; void clearProperties() throws JMSException; boolean propertyExists(String name) throws JMSException; boolean getBooleanProperty(String name) throws JMSException; byte getByteProperty(String name) throws JMSException; short getShortProperty(String name) throws JMSException; int getIntProperty(String name) throws JMSException; long getLongProperty(String name) throws JMSException; float getFloatProperty(String name) throws JMSException; double getDoubleProperty(String name) throws JMSException; String getStringProperty(String name) throws JMSException; Object getObjectProperty(String name) throws JMSException; Enumeration getPropertyNames() throws JMSException; void setBooleanProperty(String name, boolean value) throws JMSException; void setByteProperty(String name, byte value) throws JMSException; void setShortProperty(String name, short value) throws JMSException; void setIntProperty(String name, int value) throws JMSException; void setLongProperty(String name, long value) throws JMSException; void setFloatProperty(String name, float value) throws JMSException; void setDoubleProperty(String name, double value) throws JMSException; void setStringProperty(String name, String value) throws JMSException; void setObjectProperty(String name, Object value) throws JMSException; void acknowledge() throws JMSException; void clearBody() throws JMSException; } 通讯开发必备源码资料!
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