（七）RabbitMQ消息队列-通过fanout模式将消息推送到多个Queue中

来源：互联网发布：淘宝店铺行业排名编辑：程序博客网时间：2024/06/07 03:37

前面第六章我们使用的是direct直连模式来进行消息投递和分发。本章将介绍如何使用fanout模式将消息推送到多个队列。
有时我们会遇到这样的情况，多个功能模块都希望得到完整的消息数据。例如一个log的消息，一个我们希望输出在屏幕上实时监控，另外一个用户持久化日志。这时就可以使用fanout模式。fanout模式模式不像direct模式通过routingkey来进行匹配，而是会把消息发送到所以的已经绑定的队列中。

RabbitMQ fanout模式

新建fanout.php用来发布消息。ca.php和cb.php用来订阅不同队列消费消息。

fanout.php

<?php/* * RabbitMQ fanout * create by superrd */$exchangeName = 'log';$message = 'log--';$connection = new AMQPConnection(array('host' => '10.99.121.137', 'port' => '5672', 'vhost' => '/', 'login' => 'superrd', 'password' => 'superrd'));$connection->connect() or die("Cannot connect to the broker!\n");try {        $channel = new AMQPChannel($connection);        $exchange = new AMQPExchange($channel);        $exchange->setName($exchangeName);        $exchange->setType(AMQP_EX_TYPE_FANOUT);        $exchange->setFlags(AMQP_DURABLE);        $exchange->declareExchange();        for($i=0 ; $i<100;$i++){        $exchange->publish($message.$i,"");        var_dump("[x] Sent $message $i");        }} catch (AMQPConnectionException $e) {        var_dump($e);        exit();} $connection->disconnect();

ca.php

<?php/* * RabbitMQ fanout 模式 * create by superrd */$exchangeName = 'log';$queueName = 'queuea';$routeKey = '';$connection = new AMQPConnection(array('host' => '10.99.121.137','port' => '5672', 'vhost' => '/', 'login' => 'superrd', 'password' => 'superrd'));$connection->connect() or die("Cannot connect to the broker!\n");$channel = new AMQPChannel($connection);$exchange = new AMQPExchange($channel);$exchange->setName($exchangeName);$exchange->setType(AMQP_EX_TYPE_FANOUT);$exchange->setFlags(AMQP_DURABLE);$exchange->declareExchange();$queue = new AMQPQueue($channel);$queue->setName($queueName);$queue->setFlags(AMQP_DURABLE);$queue->declareQueue();$queue->bind($exchangeName, $routeKey);//阻塞模式接收消息echo "Message:\n";while(True){    $queue->consume('processMessage');    //$queue->consume('processMessage', AMQP_AUTOACK); //自动ACK应答}$conn->disconnect();/*** 消费回调函数* 处理消息*/function processMessage($envelope, $q) {    $msg = $envelope->getBody();    sleep(1);    echo $msg."\n"; //处理消息    $q->ack($envelope->getDeliveryTag()); //手动发送ACK应答}

cb.php

/* * RabbitMQ fanout 模式 * create by superrd */$exchangeName = 'log';$queueName = 'queueb';$routeKey = '';$connection = new AMQPConnection(array('host' => '10.99.121.137','port' => '5672', 'vhost' => '/', 'login' => 'superrd', 'password' => 'superrd'));$connection->connect() or die("Cannot connect to the broker!\n");$channel = new AMQPChannel($connection);$exchange = new AMQPExchange($channel);$exchange->setName($exchangeName);$exchange->setType(AMQP_EX_TYPE_FANOUT);$exchange->setFlags(AMQP_DURABLE);$exchange->declareExchange();$queue = new AMQPQueue($channel);$queue->setName($queueName);$queue->setFlags(AMQP_DURABLE);$queue->declareQueue();$queue->bind($exchangeName, $routeKey);//阻塞模式接收消息echo "Message:\n";while(True){    $queue->consume('processMessage');    //$queue->consume('processMessage', AMQP_AUTOACK); //自动ACK应答}$conn->disconnect();/*** 消费回调函数* 处理消息*/function processMessage($envelope, $q) {    $msg = $envelope->getBody();    sleep(1);    echo $msg."\n"; //处理消息    $q->ack($envelope->getDeliveryTag()); //手动发送ACK应答}

RabbitMQfanout模式

可以看到ca和cb收到的消息完全一致。注意以上代码fanout.php中并没有新建队列，所以先运行ca.php和cb.php的脚本，如果先运行fanout.php因为找不到绑定的队列数据就会丢失。
还有一种情况我们有可能随时增加一项处理机制，如果在声明queue时不指定名字，那么RabbitMQ会随机为我们生成一个名字，如果不指定queue为持久化队列那在消息为空并且订阅者为0时自动删除该队列。这样Queue挥之即来呼之即去。

<?php/* * RabbitMQ fanout 模式 * create by superrd */$exchangeName = 'log';$connection = new AMQPConnection(array('host' => '10.99.121.137','port' => '5672', 'vhost' => '/', 'login' => 'superrd', 'password' => 'superrd'));$connection->connect() or die("Cannot connect to the broker!\n");$channel = new AMQPChannel($connection);$exchange = new AMQPExchange($channel);$exchange->setName($exchangeName);$exchange->setType(AMQP_EX_TYPE_FANOUT);$exchange->setFlags(AMQP_DURABLE);$exchange->declareExchange();$queue = new AMQPQueue($channel);$queue->declareQueue();$queue->bind($exchangeName, $routeKey);//阻塞模式接收消息echo "Message:\n";while(True){    $queue->consume('processMessage');    //$queue->consume('processMessage', AMQP_AUTOACK); //自动ACK应答}$conn->disconnect();/*** 消费回调函数* 处理消息*/function processMessage($envelope, $q) {    $msg = $envelope->getBody();    sleep(1);    echo $msg."\n"; //处理消息    $q->ack($envelope->getDeliveryTag()); //手动发送ACK应答}

RabbitMQ技术交流QQ群：327034977（添加时请备注RabbitMQ）

0 0