Zeromq

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Zeromq的资源：

Zeromq模式：

http://blog.codingnow.com/2011/02/zeromq_message_patterns.html

zeromq主页：

http://www.zeromq.org/

Zeromq Guild：

http://zguide.zeromq.org/page:all#Fixing-the-World

Zeromq 中文简介：

http://blog.csdn.net/program_think/article/details/6687076

Zero wiki:

http://en.wikipedia.org/wiki/%C3%98MQ

zeromq系列：

http://iyuan.iteye.com/blog/972949

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”）

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<?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）

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<?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);
 
}

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天气气候订阅系统：(pub-sub)

1 server端：

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<?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：

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<?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));

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

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pub-sub的proxy模式：

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图示是：

clip_image001_thumb[2]

Proxy节点的代码：

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<?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

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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

http://www.cnblogs.com/yjf512/archive/2012/03/03/2378024.html