Zeromq的资源：

Zeromq模式：

zeromq主页：

Zeromq Guild：

Zeromq 中文简介：

Zero wiki:

zeromq系列：

Zeromq资源阅读：

ØMQ（Zeromq）是一个更为高效的传输层

优势是：

1 程序接口库是一个并发框架

2 在集群和超级计算机上表现得比TCP更快

3 通过inproc, IPC, TCP, 和 multicast进行传播消息

4 通过发散，订阅，流水线，请求的方式连接

5 对于不定规模的多核消息传输应用使用异步IO

6 有非常大并且活跃的开源社区

7 支持30+的语言

8 支持多种系统

Zeromq定义为“史上最快的消息队列”

从网络通信的角度看，它处于会话层之上，应用层之下。

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”）


    	*/		$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）


    	*/		$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：


    	*/		//  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：


    	*/		$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：


    	*/		$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

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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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