ActiveMQ中如何实现异步发送消息？

ActiveMQ 中可以通过以下方式实现异步发送消息:

1. 使用 JMSProducer 的 send() 方法并传入异步监听器:

JMSProducer producer = session.createProducer(queue);
producer.setDeliveryMode(DeliveryMode.PERSISTENT);

producer.send(message, new CompletionListener() {
    @Override
    public void onCompletion(Message msg) {
        System.out.println("Message sent asynchronously");
    }

    @Override
    public void onException(Message msg, Exception ex) {
        System.out.println("Message sending failed: " + ex.getMessage()); 
    }
});

2. 在消息发送后注册异步监听器:

JMSProducer producer = session.createProducer(queue);
producer.setDeliveryMode(DeliveryMode.PERSISTENT);  

producer.send(message);

producer.setAsync(new CompletionListener() {
    @Override
    public void onCompletion(Message msg) {
        System.out.println("Message sent asynchronously");
    }

    // ...
});

3. 使用 JMSAsyncProducer 来发送异步消息:

JMSAsyncProducer asyncProducer = session.createAsyncProducer(queue);
asyncProducer.setDeliveryMode(DeliveryMode.PERSISTENT);

asyncProducer.send(message, new CompletionListener() {
    // ...
});
JMSAsyncProducer 专用于异步发送消息,简化了异步发送的配置。

4. 在发送消息的线程中注册异步监听器:

JMSProducer producer = session.createProducer(queue);

new Thread() {
    public void run() {
        producer.send(message);
        producer.setAsync(new CompletionListener() {
            // ...
        });
    }
}.start();

启动新的线程发送消息,在发送线程中注册异步监听器,实现异步效果。