jms topic与jms queue区别
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在JMS中,Topic实现publish和subscribe语义。一条消息被publish时,它将发到所有感兴趣的订阅者,所以零到多个 subscriber将接收到消息的一个拷贝。但是在消息代理接收到消息时,只有激活订阅的subscriber能够获得消息的一个拷贝。
JMS Queue执行load balancer语义。一条消息仅能被一个consumer收到。如果在message发送的时候没有可用的consumer,那么它将被保存一直到能处 理该message的consumer可用。如果一个consumer收到一条message后却不响应它,那么这条消息将被转到另一个consumer 那儿。一个Queue可以有很多consumer,并且在多个可用的consumer中负载均衡
Jms规范里的两种message传输方式Topic和Queue,两者的对比如下表():
Queue数据默认会在mq服务器上以文件形式保存,比如Active MQ一般保存在$AMQ_HOME\data\kr-store\data下面。也可以配置成DB存储。
完整性保障并不保证publisher发布的每条数据,Subscriber都能接受到。Queue保证每条数据都能被receiver接收。消息是否会丢失一般来说publisher发布消息到某一个topic时,只有正在监听该topic地址的sub能够接收到消息;如果没有sub在监听,该topic就丢失了。Sender发送消息到目标Queue,receiver可以异步接收这个Queue上的消息。Queue上的消息如果暂时没有receiver来取,也不会丢失。消息发布接收策略一对多的消息发布接收策略,监听同一个topic地址的多个sub都能收到publisher发送的消息。Sub接收完通知mq服务器一对一的消息发布接收策略,一个sender发送的消息,只能有一个receiver接收。receiver接收完后,通知mq服务器已接收,mq服务器对queue里的消息采取删除或其他操作。
以下是符合Jms1.1规范的使用Queue传输消息的代码,使用Active mq作为Jms的实现,想要更clean的代码,可以考虑将Amq的实现DI:
- public void testMySend() throws JMSException {
- Connection connection = new ActiveMQConnectionFactory( "admin" , "admin" , "tcp://localhost:61616" ).createConnection();
- Session session = null ;
- Queue queue = null ;
- MessageProducer producer = null ;
- session = connection.createSession(false , Session.AUTO_ACKNOWLEDGE);
- queue=session.createQueue("myTest" );
- producer= session.createProducer(queue);
- Message msg=session.createTextMessage("hello" );
- producer.send(msg);
- producer.close();
- session.close();
- connection.close();
- }
- public void testMyReceive() throws JMSException{
- Connection connection = new ActiveMQConnectionFactory( "admin" , "admin" , "tcp://localhost:61616" ).createConnection();
- Session session = connection.createSession(false , Session.AUTO_ACKNOWLEDGE);
- Queue queue = session.createQueue("myTest" );
- MessageConsumer consumer= session.createConsumer(queue);
- consumer.setMessageListener(new MyListener());
- connection.start();
- consumer.close();
- session.close();
- connection.close();
- }
- public void testMySend() throws JMSException {
- Connection connection = new ActiveMQConnectionFactory("admin","admin","tcp://localhost:61616").createConnection();
- Session session = null;
- Queue queue = null;
- MessageProducer producer = null;
- session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
- queue=session.createQueue("myTest");
- producer= session.createProducer(queue);
- Message msg=session.createTextMessage("hello");
- producer.send(msg);
- producer.close();
- session.close();
- connection.close();
- }
- public void testMyReceive() throws JMSException{
- Connection connection = new ActiveMQConnectionFactory("admin","admin","tcp://localhost:61616").createConnection();
- Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
- Queue queue = session.createQueue("myTest");
- MessageConsumer consumer= session.createConsumer(queue);
- consumer.setMessageListener(new MyListener());
- connection.start();
- consumer.close();
- session.close();
- connection.close();
- }
消费端需要设定一个MessageListener:
- private class MyListener implements MessageListener{
- public void onMessage(Message message) {
- System.out.println("msg start!----------------" );
- try {
- System.out.println("" +((TextMessage)message).getText());
- } catch (JMSException e) {
- e.printStackTrace();
- }
- System.out.println("msg end!----------------" );
- }
- }
以下是符合Jms1.1规范的使用Topic 发送消息的代码:
- public void testMyTopicPublisher() throws JMSException {
- Connection connection = new ActiveMQConnectionFactory( "admin" , "admin" , "tcp://localhost:61616" ).createConnection();
- Session session = null ;
- Topic topic = null ;
- MessageProducer producer = null ;
- session = connection.createSession(false , Session.AUTO_ACKNOWLEDGE);
- topic=session.createTopic("myTopicTest" );
- producer= session.createProducer(topic);
- producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
- Message msg=session.createTextMessage("hello and whatever u say" );
- producer.send(msg);
- producer.close();
- session.close();
- connection.close();
- }
- public void testMyTopicPublisher() throws JMSException {
- Connection connection = new ActiveMQConnectionFactory("admin","admin","tcp://localhost:61616").createConnection();
- Session session = null;
- Topic topic = null;
- MessageProducer producer = null;
- session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
- topic=session.createTopic("myTopicTest");
- producer= session.createProducer(topic);
- producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
- Message msg=session.createTextMessage("hello and whatever u say");
- producer.send(msg);
- producer.close();
- session.close();
- connection.close();
- }
以下是符合Jms1.1规范的使用Topic 接收消息的代码:
- public static void testMyTopicConsumer() throws JMSException, InterruptedException{
- Connection connection = new ActiveMQConnectionFactory( "admin" , "admin" , "tcp://localhost:61616" ).createConnection();
- Session session = connection.createSession(false , Session.CLIENT_ACKNOWLEDGE);
- Topic topic = session.createTopic("myTopicTest" );
- MessageConsumer consumer= session.createConsumer(topic);
- consumer.setMessageListener(new MyListener());
- connection.start();
- }
- public static void testMyTopicConsumer() throws JMSException, InterruptedException{
- Connection connection = new ActiveMQConnectionFactory("admin","admin","tcp://localhost:61616").createConnection();
- Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
- Topic topic = session.createTopic("myTopicTest");
- MessageConsumer consumer= session.createConsumer(topic);
- consumer.setMessageListener(new MyListener());
- connection.start();
- }
jms在创建Session时可以有两个参数,第一个参数是是否使用事务,第二个参数是消费者向发送者确认消息已经接收的方式:
- Session session = connection.createSession( false , Session.CLIENT_ACKNOWLEDGE);
- Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
确认消息的方式有如下三种:
AUTO_ACKNOWLEDGE(自动通知)
CLIENT_ACKNOWLEDGE(客户端自行决定通知时机)
DUPS_OK_ACKNOWLEDGE(延时//批量通知)
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