传输方式Topic和Queue的对比
2013-06-09 11:06
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Jms规范里的两种message传输方式Topic和Queue,两者的对比如下表():
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:
Java代码
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:
Java代码
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!----------------");
}
}
Java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(); }
Java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(); }
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:
Java代码
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)
如果使用的是 客户端自行决定通知时机 方式,那么需要在MessageListener里显式调用message.acknowledge()来通知服务器。服务器接收到通知后采取相应的操作。
转自:
/article/4172106.html
Topic | Queue | |
概要 | Publish Subscribe messaging 发布订阅消息 | Point-to-Point 点对点 |
有无状态 | topic数据默认不落地,是无状态的。 | 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。 |
Java代码
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:
Java代码
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!----------------");
}
}
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:
Java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:
Java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:
Java代码
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)
如果使用的是 客户端自行决定通知时机 方式,那么需要在MessageListener里显式调用message.acknowledge()来通知服务器。服务器接收到通知后采取相应的操作。
转自:
/article/4172106.html
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