ActiveMQ（二十六）--ActiveMQ的集群2

 

实操：

conf和conf2的activemq.xml都要配这两段。

conf和conf2的回流功能注释掉。

现在brokerA和brokerB之间没有关系。它们抢着同一个db。

用以下代码测试：

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

public class QueueSender1 {
    public static void main(String[] args) throws JMSException, InterruptedException {
//        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.25.128:61616");
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(
                "failover:(tcp://192.168.25.128:61616,tcp://192.168.25.128:61716)?randomize=false");

        Connection connection = connectionFactory.createConnection();
        connection.start();

        Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
        Destination destination = session.createQueue("my-queue");

        MessageProducer producer = session.createProducer(destination);

        for (int i = 0; i < 30; i++) {
            TextMessage message = session.createTextMessage("message999--" + i);
            producer.send(message);

        }

        session.commit();
        session.close();
        connection.close();
    }
}

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

public class QueueReceiver1 {
    public static void main(String[] args) throws JMSException, InterruptedException {
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.25.128:61616");
        for (int i = 0; i < 10; i++) {
            Thread t = new MyThread(connectionFactory);
            t.start();
            Thread.sleep(1000);
        }
    }
}

class MyThread extends Thread {

    private ConnectionFactory connectionFactory = null;

    public MyThread(ConnectionFactory connectionFactory) {
        this.connectionFactory = connectionFactory;
    }

    @Override
    public void run() {
        try {
            final Connection connection = connectionFactory.createConnection();
            connection.start();
            final Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createQueue("my-queue");
            MessageConsumer consumer = session.createConsumer(destination);
            consumer.setMessageListener(new MessageListener() {
                @Override
                public void onMessage(Message message) {
                    TextMessage txtMsg = (TextMessage) message;
                    try {
                        System.out.println("Receiver111===" + txtMsg.getText());
                        session.commit();
                        session.close();
                        connection.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }
}

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

public class QueueReceiver2 {
    public static void main(String[] args) throws JMSException, InterruptedException {
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.25.128:61716");
        for (int i = 0; i < 10; i++) {
            Thread t = new MyThread2(connectionFactory);
            t.start();
            Thread.sleep(1000);
        }
    }
}

class MyThread2 extends Thread {

    private ConnectionFactory connectionFactory = null;

    public MyThread2(ConnectionFactory connectionFactory) {
        this.connectionFactory = connectionFactory;
    }

    @Override
    public void run() {
        try {
            final Connection connection = connectionFactory.createConnection();
            connection.start();
            final Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createQueue("my-queue");
            MessageConsumer consumer = session.createConsumer(destination);
            consumer.setMessageListener(new MessageListener() {
                @Override
                public void onMessage(Message message) {
                    TextMessage txtMsg = (TextMessage) message;
                    try {
                        System.out.println("Receiver222===" + txtMsg.getText());
                        session.commit();
                        session.close();
                        connection.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }
}

启动两个broker，brokerA先启动，那么，它就是master，brokerB是slave。

然后，运行QueueSender1，产生30条消息，到由brokerA和brokerB组成的集群中。

运行QueueReceiver2，消费几条消息。再运行QueueReceiver1，消费几条消息。均能消费。

然后，停止brokerA。QueueReceiver1不能连接到brokerA了。但是，QueueReceiver2还是能连到brokerB。这说明，对于整个集群来说，brokerA宕机之后，brokerB会升级为master来提供访问。