ActiveMQ

Question

根据http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#acknowledge()

A client may individually acknowledge each message as it is consumed, or it may choose to acknowledge messages as an application-defined group (which is done by calling acknowledge on the last received message of the group, thereby acknowledging all messages consumed by the session.)

如何在 ActiveMQ 中实现？我无法让它工作。

Answer 1

在与 Matt Pavlovich 发表以下评论后，我正在更正我的答案。

CLIENT_ACKNOWLEDGE: With this option, a client acknowledges a message by calling the message’s acknowledge method. Acknowledging a consumed message automatically acknowledges the receipt of all messages that have been delivered by its session.

因此，CLIENT_ACKNOWLEDGE 选项不能用于向 JMS 提供程序发送单个消息的确认。

您可以在此处查看规格：

http://download.oracle.com/otndocs/jcp/jms-2_0-fr-eval-spec/index.html

Answer 2

这里是 ActiveMQ 客户端的例子，

import javax.jms.Connection;
import javax.jms.JMSException;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQMessageConsumer;
import org.apache.activemq.ActiveMQSession;
import org.apache.activemq.command.ActiveMQTextMessage;

public class SimpleConsumer {

    public static void main(String[] args) throws JMSException {
        Connection conn = null;
        try {
            ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("tcp://localhost:61616");
            conn = cf.createConnection("consumer", "consumer");
            ActiveMQSession session = (ActiveMQSession) conn.createSession(false,
                    ActiveMQSession.INDIVIDUAL_ACKNOWLEDGE);
            ActiveMQMessageConsumer consumer = (ActiveMQMessageConsumer) session
                    .createConsumer(session.createQueue("QUEUE"));
            conn.start();
            ActiveMQTextMessage msg = null;
            while ((msg = (ActiveMQTextMessage) consumer.receive()) != null) {
                System.out.println("Received message is: " + msg.getText());
                msg.acknowledge();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (Exception e) {
                }
            }
        }
    }
}

ActiveMQ - 是否可以在 CLIENT_ACKNOWLEDGE 模式下确认单个消息

ActiveMQ - is it possible to acknowledge single message in CLIENT_ACKNOWLEDGE mode

jms