关于消息队列——ZeroMQ的安装
ZeroMQ —— The Intelligent Transport Layer (智能的传输层封装)
1,与其说它可嵌入的网络库，不如说是一个并发的socket框架
2,集群上使用比TCP快速
3,消息通过inpro，IPC，TCP以及广播方式传输
4,通过fanout(扇出)，pubsub，pipeline，request-reply实现多对多通信
5,异步IO
6,活跃社区支持
7,拥有30多种语言的扩展库
8,支持window，linux，os x等系统
9,LGPL许可
安装过程如下：
下载源码zeromq-3.2.2.tar.gz编译安装，然后安装php扩展
git clone git://github.com/mkoppanen/php-zmq.git phpize ./configure --with-php-config=/root/bin/php-config make && make install
编辑php.ini 添加 extension=zmq.so
编程参考手册 http://php.zero.mq
这里有大量程序示例可供参考https://github.com/imatix/zguide
A，request/reply
写一个服务端 server.php
<?php
/*
* Hello World server
* Binds REP socket to tcp://*:5555
* Expects "Hello" from client, replies with "World"
* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
*/
$context = new ZMQContext(1);
$responder = new ZMQSocket($context, ZMQ::SOCKET_REP);
$responder->bind("tcp://*:5555");
while (true) {
// Wait for next request from client
$request = $responder->recv();
printf ("Received request: [%s]\n", $request);
// Do some 'work'
sleep (1);
// Send reply back to client
$responder->send("World");
}
写一个客户端client.php
<?php
//allocate a new context
$context = new ZMQContext();
//create a new socket
$queue = $context->getSocket(ZMQ::SOCKET_REQ,"mysock");
//connect the server
$queue->connect("tcp://127.0.0.1:5555");
//send and receive message
var_dump($queue->send("Hello, using mysock")->recv());
?>
一个简单的服务应答就搭建好了，支持并发。可以开启多个client.php去连接服务器端测试。这是简单的request-reply，下面看看如何实现pub/sub（发布/订阅）
B，publish/subscribe
发布端 publisher.php
<?php
// Prepare our context and publisher
$context = new ZMQContext();
$publisher = $context->getSocket(ZMQ::SOCKET_PUB);
$publisher->bind("tcp://127.0.0.1:5556");
while (true) {
$filter = mt_rand(1, 9);
// Send message to all subscribers
$update = sprintf ("%d Hello%d", $filter, $filter);
$publisher->send($update);
usleep(100000);
}
?>
订阅端 subscriber.php
<?php
$context = new ZMQContext();
// Socket to talk to server
echo "Subscribe message from server...", PHP_EOL;
$subscriber = new ZMQSocket($context, ZMQ::SOCKET_SUB);
$subscriber->connect("tcp://127.0.0.1:5556");
// Subscribe to 1 or other channel
$filter = $_SERVER['argc'] > 1 ? $_SERVER['argv'][1] : "1";
$subscriber->setSockOpt(ZMQ::SOCKOPT_SUBSCRIBE, $filter);
// Process 100 updates
$total_temp = 0;
while(true) {
$string = $subscriber->recv();
sscanf ($string, "%d %s", $filter, $msg);
echo "$filter recv $msg\n";
}
?>
运行一个publisher.php端，然后启动多个subscriber.php
a, php subscriber.php 1 (能收到$filter=1的所有消息)
b, php subscriber.php 1 (能收到$filter=1的所有消息)
c, php subscriber.php 3 (能收到$filter=3的所有消息)