java - ActiveMQ,为什么RedeliveryCounter在Ack之前关闭消费者时不会增加

java - ActiveMQ,为什么RedeliveryCounter在Ack之前关闭消费者时不会增加,第1张

我的消费者在应用服务器中运行。这是我的ActiveMq配置:

optimizeAcknowledge=true  
optimizeAcknowledgeTimeOut=5000  
destination=queue.test.msg?consumer.prefetchSize=10  

发送10条消息后," Web控制台(http://localhost:8161/admin)"可以看到3条消息不要Ack(使用optimizeAcknowledge),此时当我重新启动消费者服务器时,我再次收到3消息,RedeliveryCounter = 0。所以我不确定这是重传消息还是只是由制作人发送。

这个问题也可以在交易中找到。我运行测试类:org \ apache \ activemq \ RedeliveryPolicyTest.java,methoed:testRepeatedRedeliveryReceiveNoCommit。调试" connection.close();"并阻止它。消息的RedeliveryCounter也是" 0"。

问题:因此,当我确实确定邮件是否已重新发送时,我必须在消费者处理完邮件之后使用商店保存所有邮件的ID,并在消费者收到邮件时检查是否存在?

代码如下:

public void testRepeatedRedeliveryReceiveNoCommit() throws Exception {
    connection.start();
    Session dlqSession = connection.createSession(true, Session.SESSION_TRANSACTED);
    ActiveMQQueue destination = new ActiveMQQueue("TEST");
    MessageProducer producer = dlqSession.createProducer(destination);

    // Send the messages
    producer.send(dlqSession.createTextMessage("1st"));

    dlqSession.commit();
    MessageConsumer dlqConsumer = dlqSession.createConsumer(new ActiveMQQueue("ActiveMQ.DLQ"));

    final int maxRedeliveries = 4;
    for (int i=0;i<=maxRedeliveries  1;i  ) {

        connection = (ActiveMQConnection)factory.createConnection(userName, password);
        connections.add(connection);
        // Receive a message with the JMS API
        RedeliveryPolicy policy = connection.getRedeliveryPolicy();
        policy.setInitialRedeliveryDelay(0);
        policy.setUseExponentialBackOff(false);
        policy.setMaximumRedeliveries(maxRedeliveries);

        connection.start();
        Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer consumer = session.createConsumer(destination);

        ActiveMQTextMessage m = ((ActiveMQTextMessage)consumer.receive(4000));
        if (i<=maxRedeliveries) {
            m.setRedeliveryCounter(1);
            System.out.println("Text:"  m.getText());
            System.out.println("RedeliveryCounter:"   m.getRedeliveryCounter());
        } else {
            System.out.println("null on exceeding redelivery count:"   m);
        }
        connection.close();
        connections.remove(connection);
    }

    // We should be able to get the message off the DLQ now.
    TextMessage m = (TextMessage)dlqConsumer.receive(1000);
    System.out.println("Got message from DLQ:"   m);
    System.out.println("Text:"  m.getText());
    String cause = m.getStringProperty(ActiveMQMessage.DLQ_DELIVERY_FAILURE_CAUSE_PROPERTY);
    System.out.println("cause exception has policy ref:"    cause.contains("RedeliveryPolicy"));
    dlqSession.commit();
}

最佳答案:

0 个答案:

没有答案
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