問題描述

我正在嘗試將消息發布到隊列，然后只有當它包含某個標頭時才讓某些消費者使用它，如果它包含另一個標頭，另一個消費者會使用它.

I'm trying to publish a message to a queue and then have certain consumers consume it only if it contains a certain header and another consumer consume it if it contains another header.

到目前為止，我所做的是設置一個標頭交換，僅當消息包含該標頭時才將消息路由到某個隊列.

What I've done so far is to setup a headers-exchange that routes messages to a certain queue only if it contains that header.

這是我用來設置交換、隊列和監聽器的配置:

This is the config I'm using to setup the exchange and the queue and the listener:

<!-- Register Queue Listener Beans -->
<bean id="ActionMessageListener" class="com.mycee.Action" />    

<!-- Register RabbitMQ Connections -->
<rabbit:connection-factory 
    id="connectionFactory"
    port="${rabbit.port}"
    virtual-host="${rabbit.virtual}" 
    host="${rabbit.host}" 
    username="${rabbit.username}"
    password="${rabbit.password}" 
    connection-factory="nativeConnectionFactory" />

<!-- Register RabbitMQ Listeners -->
<rabbit:listener-container          
    connection-factory="connectionFactory"
    channel-transacted="true"
    requeue-rejected="true"
    concurrency="${rabbit.consumers}">
    <rabbit:listener queues="${queue.myqueue}" ref="ActionMessageListener" method="handle"/>        
</rabbit:listener-container>    

<!-- Setup RabbitMQ headers exchange -->
<rabbit:headers-exchange id="${exchange.myexchange}" name="${exchange.myexchange}">
    <rabbit:bindings>
        <rabbit:binding queue="${queue.myqueue}" key="action" value="action3" />            
    </rabbit:bindings>
</rabbit:headers-exchange>

<rabbit:admin connection-factory="connectionFactory"/>  
<rabbit:queue name="${queue.myqueue}" />

所以我使用 action 的鍵和 action3 的值將 myqueue 綁定到 myexchange.

So I'm binding myqueue to myexchange using key of action and value of action3.

現在當我在交易所發布時:

Now when I publish on the exchange:

即使操作設置為 action1 而不是 action3，ChannelAwareMessageListener 仍在使用它

the ChannelAwareMessageListener is consuming it even though the action was set to action1 instead of action3

public class Action implements ChannelAwareMessageListener {

    @Override
    public void onMessage(Message message, Channel channel) throws Exception {

        System.out.println(message.toString());

    }

}

要么我沒有正確使用 headers-exchange，要么我沒有正確配置它 - 有什么建議嗎?

Either I'm not using a headers-exchange correctly or I'm not configuring it correctly - any advice ?

推薦答案

這樣不行；每個消費者都需要一個單獨的隊列.請參閱教程.

It doesn't work that way; you need a separate queue for each consumer. See the tutorial.

當多個消費者從同一個隊列消費時，他們會競爭所有消息；您不能在消費者端選擇消息；選擇"是由交換機通過將消息路由到特定隊列來完成的.

When multiple consumers consume from the same queue they compete for all messages; you can't select messages on the consumer side; the "selection" is done by the exchange by routing messages to specific queue(s).

這篇關于僅使用 RabbitMQ 和 SpringAMQP 使用具有某些標頭的消息的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！