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 |
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:
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();
}
}
参考:
2.消息属性定义