RabbitMQ消息队列-交换机Fanout模式

在Fanout类型的路由控制下，交换机将每一个消息，会发给每一个绑定监听的消息队列中，下面我们以ThinkPHP的代码来详细说明这一过程。

创建一个控制器类MQExchangeFanout，其对应的类文件MQExchangeFanout.php中的代码如下

<?php
/**
 * Created by PhpStorm.
 * User: zhaoqinsong
 * Date: 2018/12/11
 * Time: 9:44 AM
 */
namespace app\msq\controller;
use think\App;
use think\Controller;
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;
class MQExchangeFanout extends Controller
{
    var $msq_connect;
    var $msq_channel;
    public function __construct(App $app)
    {
        parent::__construct($app);
        $this->msq_connect = new AMQPStreamConnection("localhost", 5672, "phpmsq", "123456");
        $this->msq_channel = $this->msq_connect->channel();
        $this->msq_channel->exchange_declare("exchange", "fanout");
    }
    public function index()
    {
        echo "rabbitmq of test";
    }
    public function mq_send()
    {
        $msg = new AMQPMessage("Hello World");
        $this->msq_channel->basic_publish($msg, "exchange", "");    // 路由键即使设置也会无效
    }
    public function mq_recv1()
    {
        $this->msq_channel->queue_declare("simple1", false, true, false, false);    //  生成一个持久化消息队列
        $this->msq_channel->queue_bind("simple1", "exchange", "");      // 路由键即使设置也会无效
        $this->msq_channel->basic_qos(null,1, null);
        //  处理消息队列simple中的消息
        $callback = function($msg) {
            $body = $msg->body;
            echo "recv:$body\n";
        };
        $this->msq_channel->basic_consume("simple1", "", false, true, false, false, $callback);
        while ($this->msq_channel->callbacks) {
            $this->msq_channel->wait();
        }
    }
    public function mq_recv2()
    {
        $this->msq_channel->queue_declare("simple2", false, true, false, false);    //  生成一个持久化消息队列
        $this->msq_channel->queue_bind("simple2", "exchange", "");      // 路由键即使设置也会无效
        $this->msq_channel->basic_qos(null,1, null);
        //  处理消息队列simple中的消息
        $callback = function($msg) {
            $body = $msg->body;
            echo "recv:$body\n";
        };
        $this->msq_channel->basic_consume("simple2", "", false, true, false, false, $callback);
        while ($this->msq_channel->callbacks) {
            $this->msq_channel->wait();
        }
    }
    public function __destruct()
    {
        $this->msq_channel->close();
        $this->msq_connect->close();
    }
}

指定路由，设定/fanout/send指向此类的mq_send方法，/fanout/recv1指向mq_recv1方法，/fanout/recv2指向mq_recv2方法。

在命令行下，先创建两个服务器连接，用于执行接收消息的程序

# php public/index.php /fanout/recv1

# php public/index.php /fanout/recv2

然后再创建一个服务器连接，用于执行发送消息的程序

# php public/index.php /fanout/send

这时，可以在两个消息接收端，都看到该消息被接收了

# php public/index.php /fanout/recv1
recv:Hello World

# php public/index.php /fanout/recv2
recv:Hello World

在fanout模式中，路由键的参数即使设置，也会被忽略。