Question

我正在将Glassfish和OpenMQ用于远程Consumer实例，以同步查找生产者队列和处理请求的消息。

根据麦金托什对Synchronous Consumer with JMS Queue的回答，同步消息接收可以通过调度来处理。我打算这样做，但我只看到通过异步消息驱动Bean（MDB）连接到消息队列的示例，如下所示：

import javax.jms.MessageListener;
import javax.annotation.Resource;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.ejb.MessageDrivenContext;

@MessageDriven(activationConfig = {
@ActivationConfigProperty(propertyName = "addressList", propertyValue = "mq://localhost:54020/"), //found in Producer server's domain.xml as JMS_PROVIDER_PORT
@ActivationConfigProperty(propertyName = "destinationLookup", propertyValue = "jms/ProducerRequestMessageQueue"),
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue")})

public class ConsumerNode extends Node implements MessageListener  {

    @Resource
    private MessageDrivenContext _mdc;

    public ConsumerNode() {
        super();
    }

    @Override
    public void onMessage(Message message) {
        //process message...
    }
}

如何在不实现MessageListener并设置为消息驱动Bean的情况下连接到远程Producer队列？

Answer 1

终于明白了。我需要位于以下位置的imq.jar mq库：

％GLASSFISH_HOME％/ MQ / LIB /

以下代码回答了我的问题，核心部分是init()和onMessage()方法：

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.ejb.Singleton;
import javax.ejb.Schedule;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.Session;
import javax.jms.ObjectMessage;
import javax.jms.StreamMessage;
import javax.jms.TextMessage;
import javax.jms.Connection;
import javax.jms.Queue;

//from imq.jar
import com.sun.messaging.ConnectionConfiguration;
import com.sun.messaging.ConnectionFactory;

@Singleton
public class SyncNode {
    private ConnectionFactory _producerRequestFactory;
    private Connection _connection;
    private Session _session;
    private Queue _producerRequestMessageQueue;
    private MessageConsumer _consumer;

    @PostConstruct
    void init() {
        try {
            _producerRequestFactory = new ConnectionFactory();
            _producerRequestFactory.setProperty(ConnectionConfiguration.imqBrokerHostName, "localhost");
            _producerRequestFactory.setProperty(ConnectionConfiguration.imqBrokerHostPort, "56527"); //56527 is JMS_PROVIDER_PORT found in producer's domain.xml in domain config directory
            _connection = _producerRequestFactory.createConnection();
            _session = _connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            _producerRequestMessageQueue = _session.createQueue("ProducerRequestMessageQueue"); //name of the queue that the producer sends messages to.
            _consumer = _session.createConsumer(_producerRequestMessageQueue);
            _connection.start();
        } catch (JMSException ex) {
            //handle exception
        }
    }

    @PreDestroy
    void cleanup() {
        try {
            _consumer.close();
            _session.close();
            _connection.close();
        } catch (JMSException ex) {
            //handle exception
        }
    }

    @Schedule(hour = "*", minute = "*", second = "*/10", persistent = false)
    public void onMessage() {
        try {
            _connection.start(); 
            Message message = _consumer.receive();
            //handle message
        } catch (JMSException ex) {
           //handle exception
        }
    }
}

两个代码示例帮助了我：

This answer教我使用main方法逃避正确的注释。
This tutorial帮助点击了如何连接到我的案例中的另一台服务器或端口。

JMS Consumer使用Glassfish和OpenMQ同步接收来自Remote Producer的消息

1 个答案: