ActiveMQ传输：tcp：线程可运行状态-挂着太多线程

Question

下面的代码中提供了ActiveMQ实现。有时，系统停止工作并变得非常缓慢。当我使用JavaMelody检查线程转储时-我看到太多线程长时间处于Runnable状态，并且没有终止。

ActiveMQ版本 -activemq-all-5.3.0.jar

请参考以下代码：

经纪人：

public class ActiveMQ extends HttpServlet {

private static final long serialVersionUID = -1234568008764323456;
private static final Logger logger = Logger.getLogger(ActiveMQ.class.getName());
public Listener listener;

private String msgBrokerUrl = "tcp://localhost:61602";
public BrokerService broker = null;
public TransportConnector connector = null;

@Override
public void init() throws ServletException {

    try {
        broker = new BrokerService();
        broker.setPersistent(false);
        broker.setUseJmx(false);
        connector = broker.addConnector(msgBrokerUrl);
        broker.setUseShutdownHook(true);
        System.out.println("BROKER LOADED");
        broker.start();
        broker.deleteAllMessages();

        listener = new Listener();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

听众：

public class Listener implements MessageListener {

private String msgQueueName = "jms/queue/MessageQueue";
public Session session;
public Destination adminQueue;

public static String id;

public ActiveMQConnection connection;
public MessageConsumer consumer = null;

public Listener() {
    try {

        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(
                new URI("failover://(" + "tcp://localhost:61602" + "?wireFormat.cacheEnabled=false"
                        + "&wireFormat.maxInactivityDuration=0&wireFormat.tightEncodingEnabled=true)?maxReconnectDelay=1000"));

        connection = (ActiveMQConnection) connectionFactory.createConnection();
        connection.start();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        adminQueue = session.createQueue(msgQueueName);
        id = new Timestamp(new Date().getTime()).toString();
        consumer = this.session.createConsumer(this.adminQueue, "ID='" + id + "'");
        consumer.setMessageListener(this);
    } catch (JMSException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

@SuppressWarnings("unchecked")
@Override
public void onMessage(Message message) {
    TextMessage msg = (TextMessage) message;
    try {
        String xmlMsg = msg.getText();
        // business logic
    } catch (JMSException ex) {
        ex.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

制片人：

public class Producer {
private static String url = "tcp://localhost:61602";
private static String msgQueueName = "jms/queue/MessageQueue";

public ConnectionFactory connectionFactory = null;
public Connection connection = null;
public Session session = null;
public Destination destination = null;

public Producer() {
    connectionFactory = new ActiveMQConnectionFactory(url);
}

public void sendResponse(String xml, DataBean objDataBean) {
    sendToQueue(xml, msgQueueName, objDataBean);
}

private void sendToQueue(String xml, String msgQueueName, DataBean obj) {

    try {
        Connection connection = connectionFactory.createConnection();
        connection.start();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination destination = session.createQueue(msgQueueName);
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage(xml);
        message.setJMSExpiration(1000);
        message.setStringProperty(obj.getMsgKey(), obj.getMsgValue());
        producer.send(message);

        xml = null;
        session.close();
        connection.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static void main(String[] args) {

    for (int msg = 0; msg < 20; msg++) {
        DataBean obj = getData();
        new Producer().sendResponse(xml, obj);
        ;
    }
}

}

挂线程异常详细信息：

类型1：

ActiveMQ Transport: tcp:///127.0.0.1:41818
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:152)
java.net.SocketInputStream.read(SocketInputStream.java:122)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.fill(TcpBufferedInputStream.java:50)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.read(TcpBufferedInputStream.java:58)
java.io.DataInputStream.readInt(DataInputStream.java:387)
org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:272)
org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:210)
org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:202)
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
java.lang.Thread.run(Thread.java:745)

类型2：

ActiveMQ Transport: tcp://localhost/127.0.0.1:61602
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:152)
java.net.SocketInputStream.read(SocketInputStream.java:122)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.fill(TcpBufferedInputStream.java:50)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.read(TcpBufferedInputStream.java:58)
java.io.DataInputStream.readInt(DataInputStream.java:387)
org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:272)
org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:210)
org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:202)
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
java.lang.Thread.run(Thread.java:745)

请您对此问题提供一些提示，以便进一步调查。

编辑： 我在互联网上读了几篇文章，并得出结论，我必须更新activemq jar文件并实现超时，但是当我开始阅读有关超时设置的信息时，我感到困惑，是应该在生产者和使用者，故障转移还是消息或代理服务中设置超时。每个组件的超时都有不同的用途，因此我应该考虑上述代码和异常来实现超时。

Answer 1

创建连接的成本非常高，当您关闭它时，端口将保留最多 3 分钟以确保其完全关闭。

仅当确实必须避免性能问题时才需要创建连接。我建议您创建一次连接，并保持该连接打开，除非出现错误。这可以将性能提高 2 到 3 个数量级。

这是一个很好的性能调优模式，适用于很多情况；

• 仅在确实需要时才创建和销毁昂贵的资源。
• 您多次执行的操作应保持在最低限度。即尽可能少地重复做。