ActiveMQ消息的延时和定时投递

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ActiveMQ对消息延时和定时投递做了很好的支持，其内部启动Scheduled来对该功能支持，也提供了一个封装的消息类型：org.apache.activemq.ScheduledMessage，只需要把几个描述消息定时调度方式的参数作为属性添加到消息，broker端的调度器就会按照我们想要的行为去处理消息。

Property nametypedescriptionAMQ_SCHEDULED_DELAYlong延迟投递的时间AMQ_SCHEDULED_PERIODlong重复投递的时间间隔AMQ_SCHEDULED_REPEATint重复投递次数AMQ_SCHEDULED_CRONStringCron表达式下面我们演示一下间隔性重复投递；

生产者：

package cn.slimsmart.study.activemq;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.DeliveryMode;import javax.jms.Destination;import javax.jms.MessageProducer;import javax.jms.Session;import javax.jms.TextMessage;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;import org.apache.activemq.ScheduledMessage;public class Producer {public static final String broker_url = "failover:(tcp://10.1.199.169:61616)";private static String queue_name = "test.queue";public static void main(String[] args) throws Exception {ConnectionFactory factory = new ActiveMQConnectionFactory(ActiveMQConnection.DEFAULT_USER, ActiveMQConnection.DEFAULT_PASSWORD, broker_url);// 通过工厂创建一个连接Connection connection = factory.createConnection();// 启动连接connection.start();// 创建一个session会话 事务 自动ackSession session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);// 创建一个消息队列Destination destination = session.createQueue(queue_name);// 创建生产者MessageProducer producer = session.createProducer(destination);// 消息持久化producer.setDeliveryMode(DeliveryMode.PERSISTENT);TextMessage message = session.createTextMessage("test delay message:" + System.currentTimeMillis());long time = 60 * 1000;// 延时1minlong period = 10 * 1000;// 每个10sint repeat = 6;// 6次message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD, period);message.setIntProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT, repeat);// 发送消息producer.send(message);session.commit();producer.close();session.close();connection.close();}}

消费者代码：

package cn.slimsmart.study.activemq;import java.util.concurrent.CountDownLatch;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.Message;import javax.jms.MessageConsumer;import javax.jms.MessageListener;import javax.jms.Session;import javax.jms.TextMessage;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;public class Consumer {public static final String broker_url = "failover:(tcp://10.1.199.169:61616)";private static String queue_name = "test.queue";public static void main(String[] args) throws Exception {ConnectionFactory factory = new ActiveMQConnectionFactory(ActiveMQConnection.DEFAULT_USER, ActiveMQConnection.DEFAULT_PASSWORD, broker_url);// 通过工厂创建一个连接Connection connection = factory.createConnection();// 启动连接connection.start();// 创建一个session会话 事务 自动ackSession session = connection.createSession(Boolean.TRUE, Session.CLIENT_ACKNOWLEDGE);// 创建一个消息队列Destination destination = session.createQueue(queue_name);// 创建消费者MessageConsumer consumer = session.createConsumer(destination);consumer.setMessageListener(new MessageListener() {@Overridepublic void onMessage(Message message) {try {System.out.println("receive message ：" + ((TextMessage) message).getText());message.acknowledge();} catch (JMSException e) {e.printStackTrace();}}});new CountDownLatch(1).await();}}

参考：

1.延时和定时消息投递

2.消息属性定义

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