ActiveMQ和嵌入式代理

Question

编辑：改写问题：

我想将ActiveMQ用作服务器和客户端应用程序之间的信使服务。

我正在尝试在服务器内设置嵌入式代理（即不是单独的进程），以处理产生的消息供我的客户使用。该队列被保留。

经纪人初始化如下：

BrokerService broker = new BrokerService();
KahaPersistenceAdapter adaptor = new KahaPersistenceAdapter();
adaptor.setDirectory(new File("activemq"));
broker.setPersistenceAdapter(adaptor);
broker.setUseJmx(true);
broker.addConnector("tcp://localhost:61616");
broker.start();

修补之后，我最终得到了服务器部分：

public static class HelloWorldProducer implements Runnable {
    public void run() {
        try {
            ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost"); // apparently the vm part is all i need
            Connection connection = connectionFactory.createConnection(); 
            connection.start();
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createQueue("TEST.FOO");
            MessageProducer producer = session.createProducer(destination);
            producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
            String text = "Hello world! From: " + Thread.currentThread().getName() + " : " + this.hashCode();
            TextMessage message = session.createTextMessage(text);
            System.out.println("Sent message: "+ message.hashCode() + " : " + Thread.currentThread().getName());
            producer.send(message);
            session.close();
            connection.close();
        }
        catch (Exception e) {
            System.out.println("Caught: " + e);
            e.printStackTrace();
        }
    }
}

客户端非常相似，看起来像这样：

public static class HelloWorldConsumer implements Runnable, ExceptionListener {
    public void run() {
        try {
          ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost");
            Connection connection = connectionFactory.createConnection(); // exception happens here...
            connection.start();
            connection.setExceptionListener(this);
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createQueue("TEST.FOO");
            MessageConsumer consumer = session.createConsumer(destination);
            Message message = consumer.receive(1000);
            if (message instanceof TextMessage) {
                TextMessage textMessage = (TextMessage) message;
                String text = textMessage.getText();
                System.out.println("*****Received: " + text);
            } else {
                System.out.println("*****Received obj: " + message);
            }
            consumer.close();
            session.close();
            connection.close();
        } catch (Exception e) {
            System.out.println("Caught: " + e);
            e.printStackTrace();
        }
    }

main方法只是在线程中启动其中的每一个，以开始生成/接收消息。

…但是我在每个线程的开头都遇到以下问题：

2013-01-24 07:54:31,271 INFO  [org.apache.activemq.broker.BrokerService] Using Persistence Adapter: AMQPersistenceAdapter(activemq-data/localhost)
2013-01-24 07:54:31,281 INFO  [org.apache.activemq.store.amq.AMQPersistenceAdapter] AMQStore starting using directory: activemq-data/localhost
2013-01-24 07:54:31,302 INFO  [org.apache.activemq.kaha.impl.KahaStore] Kaha Store using data directory activemq-data/localhost/kr-store/state
2013-01-24 07:54:31,339 INFO  [org.apache.activemq.store.amq.AMQPersistenceAdapter] Active data files: []
2013-01-24 07:54:31,445 DEBUG [org.apache.activemq.broker.jmx.ManagementContext] Probably not using JRE 1.4: mx4j.tools.naming.NamingService
2013-01-24 07:54:31,450 DEBUG [org.apache.activemq.broker.jmx.ManagementContext] Failed to create local registry
    java.rmi.server.ExportException: internal error: ObjID already in use
    at sun.rmi.transport.ObjectTable.putTarget(ObjectTable.java:186)
    at sun.rmi.transport.Transport.exportObject(Transport.java:92)
    at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:247)
    at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:411)
    at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:147)
        <snip....>

看来消息已成功产生和使用（我先前发布的其他问题已解决），但是上述异常让我感到担忧。

编辑：在代理关闭期间，我现在也受到以下欢迎：

2013-01-25 08:40:17,486 DEBUG [org.apache.activemq.transport.failover.FailoverTransport] Transport failed with the following exception:
    java.io.EOFException
    at java.io.DataInputStream.readInt(DataInputStream.java:392)
    at org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:269)
    at org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:210)
    at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:202)
    at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
    at java.lang.Thread.run(Thread.java:722)

Answer 1

您可以通过多种方式将代理嵌入代码中，其中很多方法在此处记录。您可能要尝试升级您的版本，因为您使用的版本似乎已经很老了，因为它默认使用现已弃用的AMQ
Store，而不是较新的KahaDB存储。由于客户端线程之间存在竞争，您可能会遇到问题，因为它们使用可以争先在VM代理中创建的不同连接工厂。如果在生产者上设置create
= false选项，并确保使用者线程在此之后启动，则可以解决该问题，或者可以提前创建VM代理，然后在两个线程上添加create =
false，这样就可以解决问题。

BrokerService broker = new BrokerService();
// configure the broker
broker.setBrokerName("localhost");
broker.setUseJmx(false);
broker.start();

然后在客户端代码中，只需通过此连接工厂配置进行附加。

ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost?create=false");