zeromq_传说中最快的消息队列

ØMQ (ZeroMQ, 0MQ, zmq) looks like an embeddable networking library but acts like a concurrency framework. It gives you sockets that carry whole messages across various transports like in-process, inter-process, TCP, and multicast. You can connect sockets N-to-N with patterns like fanout, pub-sub, task distribution, and request-reply. It's fast enough to be the fabric for clustered products. Its asynchronous I/O model gives you scalable multicore applications, built as asynchronous message-processing tasks. It has a score of language APIs and runs on most operating systems. ØMQ is from iMatix and is LGPL open source.

Zeromq中传递的数据格式是由用户自己负责，就是说如果server发送的string是有带"\0"的，那么client就必须要知道有这个

Pub_Sub模式。

the subscriber will always miss the first messages that the publisher sends. This is because as the subscriber connects to the publisher (something that takes a small but non-zero time), the publisher may already be sending messages out.

在这种模式下很可能发布者刚启动时发布的数据出现丢失，原因是用zmq发送速度太快，在订阅者尚未与发布者建立联系时，已经开始了数据发布(内部局域网没这么夸张的)。官网给了两个解决方案;1,发布者sleep一会再发送数据(这个被标注成愚蠢的);2,使用proxy。

Zeromq示例：

1 获取例子

git clone --depth=1 git://github.com/imatix/zguide.git

2 服务器端：

（当服务器收到消息的时候，服务器回复“World”）

<?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);
	
	//  Socket to talk to clients
	$responder = new ZMQSocket($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");    

}

3 客户端：

（客户端发送消息）

<?php
	/*
	*  Hello World client
	*  Connects REQ socket to tcp://localhost:5555
	*  Sends "Hello" to server, expects "World" back
	* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
	*/
	
	$context = new ZMQContext();
	
	//  Socket to talk to server
	echo "Connecting to hello world server…\n";
	$requester = new ZMQSocket($context, ZMQ::SOCKET_REQ);
	$requester->connect("tcp://localhost:5555");
	
	for($request_nbr = 0; $request_nbr != 10; $request_nbr++) {
	    printf ("Sending request %d…\n", $request_nbr);
	    $requester->send("Hello");
	    
	    $reply = $requester->recv();
	    printf ("Received reply %d: [%s]\n", $request_nbr, $reply);

}

天气气候订阅系统：(pub-sub)

1 server端：

<?php
	/*
	*  Weather update server
	*  Binds PUB socket to tcp://*:5556
	*  Publishes random weather updates
	* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
	*/
	
	//  Prepare our context and publisher
	$context = new ZMQContext();
	$publisher = $context->getSocket(ZMQ::SOCKET_PUB);
	$publisher->bind("tcp://*:5556");
	$publisher->bind("ipc://weather.ipc");
	
	while (true) {
	    //  Get values that will fool the boss
	    $zipcode     = mt_rand(0, 100000);
	    $temperature = mt_rand(-80, 135);
	    $relhumidity = mt_rand(10, 60);
	
	    //  Send message to all subscribers
	    $update = sprintf ("%05d %d %d", $zipcode, $temperature, $relhumidity);
	    $publisher->send($update);
	}

2 client端：

<?php
	/*
	*  Weather update client
	*  Connects SUB socket to tcp://localhost:5556
	*  Collects weather updates and finds avg temp in zipcode
	* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
	*/
	
	$context = new ZMQContext();
	
	//  Socket to talk to server
	echo "Collecting updates from weather server…", PHP_EOL;
	$subscriber = new ZMQSocket($context, ZMQ::SOCKET_SUB);
	$subscriber->connect("tcp://localhost:5556");
	
	//  Subscribe to zipcode, default is NYC, 10001
	$filter = $_SERVER['argc'] > 1 ? $_SERVER['argv'][1] : "10001";
	$subscriber->setSockOpt(ZMQ::SOCKOPT_SUBSCRIBE, $filter);
	
	//  Process 100 updates
	$total_temp = 0;
	for ($update_nbr = 0; $update_nbr < 100; $update_nbr++) {
	    $string = $subscriber->recv();
	    sscanf ($string, "%d %d %d", $zipcode, $temperature, $relhumidity);
	    $total_temp += $temperature;
	}
	printf ("Average temperature for zipcode '%s' was %dF\n",
	    $filter, (int) ($total_temp / $update_nbr));

------------------------

pub-sub的proxy模式：

图示是：

Proxy节点的代码：

<?php
	/*
	*  Weather proxy device
	* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
	*/
	
	$context = new ZMQContext();
	
	//  This is where the weather server sits
	$frontend = new ZMQSocket($context, ZMQ::SOCKET_SUB);
	$frontend->connect("tcp://192.168.55.210:5556");
	
	//  This is our public endpoint for subscribers
	$backend = new ZMQSocket($context, ZMQ::SOCKET_PUB);
	$backend->bind("tcp://10.1.1.0:8100");
	
	//  Subscribe on everything
	$frontend->setSockOpt(ZMQ::SOCKOPT_SUBSCRIBE, "");
	
	//  Shunt messages out to our own subscribers
	while(true) {
	    while(true) {
	        //  Process all parts of the message
	        $message = $frontend->recv();
	        $more = $frontend->getSockOpt(ZMQ::SOCKOPT_RCVMORE);
	        $backend->send($message, $more ? ZMQ::SOCKOPT_SNDMORE : 0);
	        if(!$more) {
	            break; // Last message part
	        }
	    }

}

其实就是proxy同时是作为pub又作为sub的

----------------------

作者：yjf512（轩脉刃）

出处：http://www.cnblogs.com/yjf512/

本文版权归yjf512和cnBlog共有，欢迎转载，但未经作者同意必须保留此段声明

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zeromq_传说中最快的消息队列

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