如何在ActiveMQ中杀死消费者 [英] How to kill consumers in activemq

问题描述

我正在尝试摆脱特定队列中的所有消费者数量。每当我清除/删除队列时，如果我再次使用相同的名称创建该队列，仍然会保留使用者数量。即使有0条待处理的消息，仍然有6个使用者。

I am trying to get rid of all of the "Number of Consumers" in a certain queue. Whenever I purge/delete the queue, the number of consumers still remain if I ever create that queue with the same name again. Even with 0 pending messages, there are still 6 consumers.

我的问题可能出在我的Java代码中，而没有关闭会话或连接。

My problem may have stemmed in my java code while not closing the session or connection.

我尝试过重新启动和重新安装服务器。

I have tried both restarting and reinstalling the server.

这是我的生产者代码：

 private static String url = ActiveMQConnection.DEFAULT_BROKER_URL;

    public static String addElementToQueue(String queueName,String param1, String param2) throws JMSException, NamingException {
  // Getting JMS connection from the server and starting it
        ConnectionFactory connectionFactory =
                new ActiveMQConnectionFactory(url);
        Connection connection = connectionFactory.createConnection();

// JMS messages are sent and received using a Session. We will
        // create here a non-transactional session object. If you want
        // to use transactions you should set the first parameter to 'true'
        Session session = connection.createSession(false,
                Session.AUTO_ACKNOWLEDGE);

        // Destination represents here our queue on the
        // JMS server. You don't have to do anything special on the
        // server to create it, it will be created automatically.
        Destination destination = session.createQueue(queueName);

        // MessageProducer is used for sending messages (as opposed
        // to MessageConsumer which is used for receiving them)
        MessageProducer producer = session.createProducer(destination);   

        String queueMessage = param1+ "-" + param2;

        TextMessage message = session.createTextMessage(queueMessage);

        // Here we are sending the message!
        producer.send(message);

        connection.close();
        session.close();      // added after problem came up
        producer.close();     // added after problem came up

        return commandID;
}

这是我的消费者代码：

 // URL of the JMS server
    private static String url = ActiveMQConnection.DEFAULT_BROKER_URL;

    public static Pair consumeNextElement(String queueName) throws JMSException {
        // Getting JMS connection from the server
        ConnectionFactory connectionFactory
                = new ActiveMQConnectionFactory(url);
        Connection connection = connectionFactory.createConnection();
        connection.start();   

        // Creating session for seding messages
        Session session = connection.createSession(false,
                Session.AUTO_ACKNOWLEDGE);

        // Getting the queue
        Destination destination = session.createQueue(queueName);

        // MessageConsumer is used for receiving (consuming) messages
        MessageConsumer consumer = session.createConsumer(destination);


        // Here we receive the message.
        // By default this call is blocking, which means it will wait
        // for a message to arrive on the queue.
        Message message = consumer.receive();

        // There are many types of Message and TextMessage
        // is just one of them. Producer sent us a TextMessage
        // so we must cast to it to get access to its .getText()
        // method.

        String[] parts = ((TextMessage)message).getText().split("-");
        Pair retVal = new Pair(parts[0], parts[1]);

        connection.close();
        session.close();        // added after problem came up
        consumer.close();      // added after problem came up  

        return retVal;
    }

有什么想法吗？

谢谢。

推荐答案

使用者数量是队列中侦听器的数量。清除队列仅应删除排队的消息-那些监听的消费者将不受影响。

The number of consumers is the number of listeners on the queue. Purging the queue should only remove the enqueued messages - those consumers listening will be unaffected.

消费者维持/重新建立连接的能力可能取决于用于连接的传输方式，并且传输设置可能允许对连接属性进行一些调整。

The ability of the consumer to maintain/re-establish a connection may depend on the transport used to connect, and settings for the transport may allow for some tweaking of connection properties.

坦率地说，这些方面经验不足，但您可以调查咨询消息作为帮助的一种手段调试您的连接。除了报告消费者人数之外，JMX界面或网络控制台似乎没有帮助。

I frankly don't have much experience with these, but you might investigate Advisory Messages as a means to help debug your connections. The JMX interface or web console don't appear to be helpful beyond reporting consumer counts.

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