标签：tor cer active 配置 lin create 情况 ack 重复
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"丢失"的消息
如果有broker1和broker2通过networkConnector连接，有一个consumer1连接到broker1,一个consumer2连接到broker2，程序往broker1上面发送30条消息，这时consumer2连接到broker2消费消息，当consumer2消费了15条消息时，broker2挂掉了。 但是还剩下15条消息在broker2上面，这些消息就好像消息了，除非broker2重启了，然后有消费者连接到broker2上来消费消息，遇到这样的情况该怎么办呢？
从5.6版本起，在destinationPolicy上新增的选择replayWhenNoConsumers，这个选项使得broker2上有需要转发的消息但是没有消费者时，把消息回流到它原来的broker1上，同时需要把enableAudit设置为false,为了防止消息回流后被当做重复消息而不被分发，activemq.xml配置如下：
配置允许双向连接
先运行发送消息程序，然后运行61716端口的程序接收消息，再接收了5条后将程序断掉，再去运行61616端口的程序，也是可以接收消息的，这样就实现了消息的回流。
消息发送程序：
1 import javax.jms.Connection; 2 import javax.jms.ConnectionFactory; 3 import javax.jms.Destination; 4 import javax.jms.MessageProducer; 5 import javax.jms.Session; 6 import javax.jms.TextMessage; 7 8 import org.apache.activemq.ActiveMQConnectionFactory; 9 10 public class JmsSend { 11 public static void main(String[] args) throws Exception { 12 ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.1.81:61616"); 13 Connection connection = connectionFactory.createConnection(); 14 connection.start(); 15 16 Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE); 17 Destination destination = session.createQueue("my-queue"); 18 19 MessageProducer producer = session.createProducer(destination); 20 for(int i = 0;i < 10;i++){ 21 TextMessage message = session.createTextMessage("message,1212 --->" + i); 22 Thread.sleep(1000); 23 //通过生产者发出消息 24 producer.send(message); 25 } 26 session.commit(); 27 session.close(); 28 connection.close(); 29 } 30 }
61616端口接收消息程序：
1 import javax.jms.Connection; 2 import javax.jms.ConnectionFactory; 3 import javax.jms.Destination; 4 import javax.jms.MessageConsumer; 5 import javax.jms.Session; 6 import javax.jms.TextMessage; 7 8 import org.apache.activemq.ActiveMQConnectionFactory; 9 10 public class JmsReceiver { 11 public static void main(String[] args) throws Exception { 12 ConnectionFactory cf = new ActiveMQConnectionFactory("tcp://192.168.1.81:61616"); 13 Connection connection = cf.createConnection(); 14 connection.start(); 15 16 Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE); 17 Destination destination = session.createQueue("my-queue"); 18 MessageConsumer consumer = session.createConsumer(destination); 19 int i = 0; 20 while(i < 10){ 21 Thread.sleep(3000); 22 i++; 23 TextMessage message = (TextMessage)consumer.receive(); 24 session.commit(); 25 System.out.println("111接收到的消息是:"+message.getText()); 26 } 27 session.close(); 28 connection.close(); 29 } 30 }
61716端口接收消息程序：
1 import javax.jms.Connection; 2 import javax.jms.ConnectionFactory; 3 import javax.jms.Destination; 4 import javax.jms.MessageConsumer; 5 import javax.jms.Session; 6 import javax.jms.TextMessage; 7 8 import org.apache.activemq.ActiveMQConnectionFactory; 9 10 public class JmsReceiver2 { 11 public static void main(String[] args) throws Exception { 12 ConnectionFactory cf = new ActiveMQConnectionFactory("tcp://192.168.1.81:61716"); 13 Connection connection = cf.createConnection(); 14 connection.start(); 15 16 Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE); 17 Destination destination = session.createQueue("my-queue"); 18 MessageConsumer consumer = session.createConsumer(destination); 19 int i = 0; 20 while(i < 10){ 21 Thread.sleep(3000); 22 i++; 23 TextMessage message = (TextMessage)consumer.receive(); 24 session.commit(); 25 System.out.println("222接收到的消息是:"+message.getText()); 26 } 27 session.close(); 28 connection.close(); 29 } 30 }
标签：tor cer active 配置 lin create 情况 ack 重复
原文地址：http://www.cnblogs.com/xinhuaxuan/p/6139561.html
