ActiveMQ消息的延时和定时投递

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 name	type	description
AMQ_SCHEDULED_DELAY	long	延迟投递的时间
AMQ_SCHEDULED_PERIOD	long	重复投递的时间间隔
AMQ_SCHEDULED_REPEAT	int	重复投递次数
AMQ_SCHEDULED_CRON	String	Cron表达式

下面我们演示一下间隔性重复投递；

生产者：

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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ack         Session 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1min         long period = 10 * 1000;// 每个10s         int 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：

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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ack         Session 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() {             @Override             public void onMessage(Message message) {                 try {                     System.out.println("receive message ：" + ((TextMessage) message).getText());                     message.acknowledge();                 } catch (JMSException e) {                     e.printStackTrace();                 }             }         });         new CountDownLatch(1).await();     } }