我有以下两种用于 activeMQ 监听器的代码。我原以为情况 2 会更快,但事实并非如此......
情况1:这里我在主函数中创建activemq的多个监听器
public class FileReceiver {
public static void main(String[] args) {
List<MessageReceiver> messageReceiverList = new ArrayList<MessageReceiver>();
MessageReceiver msgReceiver1 = new MessageReceiver();
messageReceiverList.add(msgReceiver1);
msgReceiver1.run();
MessageReceiver msgReceiver2 = new MessageReceiver();
messageReceiverList.add(msgReceiver2);
msgReceiver2.run();
MessageReceiver msgReceiver3 = new MessageReceiver();
messageReceiverList.add(msgReceiver3);
msgReceiver3.run();
}
}
情况2:这里我在多个线程中创建activemq的多个监听器
public class FileReceiver {
public static void main(String[] args) {
List<MessageReceiver> messageReceiverList = new ArrayList<MessageReceiver>();
for(int i = 0 ; i < 3 ; i++) {
MessageReceiver msgReceiver = new MessageReceiver();
Thread thread = new Thread(msgReceiver);
thread.start();
messageReceiverList.add(msgReceiver);
System.out.println("Listener " + i + " started.");
}
}
}
这是我正在使用的 MessageReceiver 类...
class MessageReceiver implements Runnable,MessageListener {
private int numMsgsReceived = 0;
private void start() {
try {
ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(
"tcp://localhost:61616");
Connection connection = connectionFactory.createConnection();
connection.start();
ActiveMQSession session = (ActiveMQSession) connection
.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination ftQueue = session.createQueue("TEMP.DEST");
MessageConsumer consumer = session.createConsumer(ftQueue);
consumer.setMessageListener(this);
} catch (Exception e) {
e.printStackTrace();
}
}
public void onMessage(Message msg) {
incNumMsgsReceived();
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void run() {
start();
}
}
在这两种情况下,我每秒只能接收 30 条消息。 情况 2 不是应该更快吗,因为它在三个独立的线程上运行?
最佳答案
实际上,您正在使用 3 个不同的连接/ session 来创建 3 个 MessageListener,因此您在情况 1 和情况 2 中同时使用消息。这就是您看到相同吞吐量的原因。
您不需要创建线程来同时从队列中使用。对于您的每一次 session ,您都有一个主题。他们在下面的 URL 中解释了这一点:
http://activemq.apache.org/multiple-consumers-on-a-queue.html
因此,如果在情况 1 中从同一 session 创建消息监听器,在情况 2 中从不同 session 创建消息监听器,您应该会看到差异。
关于java - 在单独线程或同一线程中创建 ActiveMQ 监听器的区别,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22627685/