从 JMS 消息列表程序发出回滚信号

2022-09-04 20:42:07

我一直在使用JMS和ActiveMQ。一切都是奇迹。我没有使用春天,也不能。

该接口只有一个方法 。在实现中,有可能引发异常。如果实际上抛出异常,那么我说消息没有得到正确处理,需要重试。因此,我需要ActiveMQ等待一段时间,然后重试。即,我需要抛出的异常来回滚JMS事务。javax.jms.MessageListeneronMessage

我怎样才能完成这样的行为?

也许ActiveMQ中有一些我无法找到的配置。

或。。。也许可以取消向消费者注册s并自己使用消息,在这样的循环中:MessageListener

while (true) {
    // ... some administrative stuff like ...
    session = connection.createSesstion(true, SESSION_TRANSACTED)
    try {
        Message m = receiver.receive(queue, 1000L);
        theMessageListener.onMessage(m);
        session.commit();
    } catch (Exception e) {
        session.rollback();
        Thread.sleep(someTimeDefinedSomewhereElse);
    }
    // ... some more administrative stuff
}

在几个线程中,而不是注册侦听器。

或。。。我可以以某种方式装饰/ AOP / byte操作s自己执行此操作。MessageListener

你会走什么路线,为什么?

注意:我无法完全控制 s 代码。MessageListener

编辑概念验证测试:

@Test
@Ignore("Interactive test, just a proof of concept")
public void transaccionConListener() throws Exception {
    final AtomicInteger atomicInteger = new AtomicInteger(0);

    BrokerService brokerService = new BrokerService();

    String bindAddress = "vm://localhost";
    brokerService.addConnector(bindAddress);
    brokerService.setPersistenceAdapter(new MemoryPersistenceAdapter());
    brokerService.setUseJmx(false);
    brokerService.start();

    ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(bindAddress);
    RedeliveryPolicy redeliveryPolicy = new RedeliveryPolicy();
    redeliveryPolicy.setInitialRedeliveryDelay(500);
    redeliveryPolicy.setBackOffMultiplier(2);
    redeliveryPolicy.setUseExponentialBackOff(true);
    redeliveryPolicy.setMaximumRedeliveries(2);

    activeMQConnectionFactory.setRedeliveryPolicy(redeliveryPolicy);
    activeMQConnectionFactory.setUseRetroactiveConsumer(true);
    activeMQConnectionFactory.setClientIDPrefix("ID");
    PooledConnectionFactory pooledConnectionFactory = new PooledConnectionFactory(activeMQConnectionFactory);

    pooledConnectionFactory.start();

    Connection connection = pooledConnectionFactory.createConnection();
    Session session = connection.createSession(false, Session.DUPS_OK_ACKNOWLEDGE);
    Queue helloQueue = session.createQueue("Hello");
    MessageConsumer consumer = session.createConsumer(helloQueue);
    consumer.setMessageListener(new MessageListener() {

        @Override
        public void onMessage(Message message) {
            TextMessage textMessage = (TextMessage) message;
            try {
                switch (atomicInteger.getAndIncrement()) {
                    case 0:
                        System.out.println("OK, first message received " + textMessage.getText());
                        message.acknowledge();
                        break;
                    case 1:
                        System.out.println("NOPE, second must be retried " + textMessage.getText());
                        throw new RuntimeException("I failed, aaaaah");
                    case 2:
                        System.out.println("OK, second message received " + textMessage.getText());
                        message.acknowledge();
                }
            } catch (JMSException e) {
                e.printStackTrace(System.out);
            }
        }
    });
    connection.start();

    {
        // A client sends two messages...
        Connection connection1 = pooledConnectionFactory.createConnection();
        Session session1 = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        connection1.start();

        MessageProducer producer = session1.createProducer(helloQueue);
        producer.send(session1.createTextMessage("Hello World 1"));
        producer.send(session1.createTextMessage("Hello World 2"));

        producer.close();
        session1.close();
        connection1.stop();
        connection1.close();
    }
    JOptionPane.showInputDialog("I will wait, you watch the log...");

    consumer.close();
    session.close();
    connection.stop();
    connection.close();
    pooledConnectionFactory.stop();

    brokerService.stop();

    assertEquals(3, atomicInteger.get());
}

答案 1

如果要使用SESSION_TRANSACTED作为确认模式,则需要在连接/连接网站上设置Redelivery策略ActiveMQ网站上的此页面还包含一些您可能需要做的事情的好信息。

由于您没有使用Spring,因此您可以使用类似于以下代码的内容(取自上述链接之一)设置RedeliveryPolicy:

RedeliveryPolicy policy = connection.getRedeliveryPolicy();
policy.setInitialRedeliveryDelay(500);
policy.setBackOffMultiplier(2);
policy.setUseExponentialBackOff(true);
policy.setMaximumRedeliveries(2);

编辑将代码段添加到答案中,下面显示了如何处理事务。尝试将此代码注释掉 Session.rollback() 方法,您将看到使用 SESION_TRANSACTED 和 Session.commit/rollback 按预期工作:

@Test
public void test() throws Exception {
    final AtomicInteger atomicInteger = new AtomicInteger(0);

    BrokerService brokerService = new BrokerService();

    String bindAddress = "vm://localhost";
    brokerService.addConnector(bindAddress);
    brokerService.setPersistenceAdapter(new MemoryPersistenceAdapter());
    brokerService.setUseJmx(false);
    brokerService.start();

    ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(bindAddress);
    RedeliveryPolicy redeliveryPolicy = new RedeliveryPolicy();
    redeliveryPolicy.setInitialRedeliveryDelay(500);
    redeliveryPolicy.setBackOffMultiplier(2);
    redeliveryPolicy.setUseExponentialBackOff(true);
    redeliveryPolicy.setMaximumRedeliveries(2);

    activeMQConnectionFactory.setRedeliveryPolicy(redeliveryPolicy);
    activeMQConnectionFactory.setUseRetroactiveConsumer(true);
    activeMQConnectionFactory.setClientIDPrefix("ID");

    PooledConnectionFactory pooledConnectionFactory = new PooledConnectionFactory(activeMQConnectionFactory);

    pooledConnectionFactory.start();

    Connection connection = pooledConnectionFactory.createConnection();
    final Session session = connection.createSession(true, Session.SESSION_TRANSACTED);
    Queue helloQueue = session.createQueue("Hello");
    MessageConsumer consumer = session.createConsumer(helloQueue);
    consumer.setMessageListener(new MessageListener() {

        public void onMessage(Message message) {
            TextMessage textMessage = (TextMessage) message;
            try {
                switch (atomicInteger.getAndIncrement()) {
                    case 0:
                        System.out.println("OK, first message received " + textMessage.getText());
                        session.commit();
                        break;
                    case 1:
                        System.out.println("NOPE, second must be retried " + textMessage.getText());
                        session.rollback();
                        throw new RuntimeException("I failed, aaaaah");
                    case 2:
                        System.out.println("OK, second message received " + textMessage.getText());
                        session.commit();
                }
            } catch (JMSException e) {
                e.printStackTrace(System.out);
            }
        }
    });
    connection.start();

    {
        // A client sends two messages...
        Connection connection1 = pooledConnectionFactory.createConnection();
        Session session1 = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        connection1.start();

        MessageProducer producer = session1.createProducer(helloQueue);
        producer.send(session1.createTextMessage("Hello World 1"));
        producer.send(session1.createTextMessage("Hello World 2"));

        producer.close();
        session1.close();
        connection1.stop();
        connection1.close();
    }
    JOptionPane.showInputDialog("I will wait, you watch the log...");

    consumer.close();
    session.close();
    connection.stop();
    connection.close();
    pooledConnectionFactory.stop();

    assertEquals(3, atomicInteger.get());
}

}


答案 2

您需要将确认模式设置为Session.CLIENT_ACKNOWLEDGE,客户端通过调用消息的确认方法来确认已使用的消息。

QueueSession session = connection.createQueueSession(false, Session.CLIENT_ACKNOWLEDGE);

然后,在处理消息后,需要调用 Message.acknowledge() 方法才能删除该消息。

Message message = ...;
// Processing message

message.acknowledge();

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