ZMQ之异步管家模式

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//
//  Round-trip 模拟
//
//  本示例程序使用多线程的方式启动client、worker、以及代理，
//  当client处理完毕时会发送信号给主程序。
//
#include "czmq.h"
 
static void
client_task (void *args, zctx_t *ctx, void *pipe)
{
    void *client = zsocket_new (ctx, ZMQ_DEALER);
    zmq_setsockopt (client, ZMQ_IDENTITY, "C", 1);
    zsocket_connect (client, "tcp://localhost:5555");
 
    printf ("开始测试...n");
    zclock_sleep (100);
 
    int requests;
    int64_t start;
 
    printf ("同步 round-trip 测试...n");
    start = zclock_time ();
    for (requests = 0; requests < 10000; requests++) {
        zstr_send (client, "hello");
        char *reply = zstr_recv (client);
        free (reply);
    }
    printf (" %d 次/秒n",
        (1000 * 10000) / (int) (zclock_time () - start));
 
    printf ("异步 round-trip 测试...n");
    start = zclock_time ();
    for (requests = 0; requests < 100000; requests++)
        zstr_send (client, "hello");
    for (requests = 0; requests < 100000; requests++) {
        char *reply = zstr_recv (client);
        free (reply);
    }
    printf (" %d 次/秒n",
        (1000 * 100000) / (int) (zclock_time () - start));
 
    zstr_send (pipe, "完成");
}
 
static void *
worker_task (void *args)
{
    zctx_t *ctx = zctx_new ();
    void *worker = zsocket_new (ctx, ZMQ_DEALER);
    zmq_setsockopt (worker, ZMQ_IDENTITY, "W", 1);
    zsocket_connect (worker, "tcp://localhost:5556");
 
    while (1) {
        zmsg_t *msg = zmsg_recv (worker);
        zmsg_send (&msg, worker);
    }
    zctx_destroy (&ctx);
    return NULL;
}
 
static void *
broker_task (void *args)
{
    //  准备上下文和套接字
    zctx_t *ctx = zctx_new ();
    void *frontend = zsocket_new (ctx, ZMQ_ROUTER);
    void *backend = zsocket_new (ctx, ZMQ_ROUTER);
    zsocket_bind (frontend, "tcp://*:5555");
    zsocket_bind (backend,  "tcp://*:5556");
 
    //  初始化轮询对象
    zmq_pollitem_t items [] = {
        { frontend, 0, ZMQ_POLLIN, 0 },
        { backend,  0, ZMQ_POLLIN, 0 }
    };
    while (1) {
        int rc = zmq_poll (items, 2, -1);
        if (rc == -1)
            break;              //  中断
        if (items [0].revents & ZMQ_POLLIN) {
            zmsg_t *msg = zmsg_recv (frontend);
            zframe_t *address = zmsg_pop (msg);
            zframe_destroy (&address);
            zmsg_pushstr (msg, "W");
            zmsg_send (&msg, backend);
        }
        if (items [1].revents & ZMQ_POLLIN) {
            zmsg_t *msg = zmsg_recv (backend);
            zframe_t *address = zmsg_pop (msg);
            zframe_destroy (&address);
            zmsg_pushstr (msg, "C");
            zmsg_send (&msg, frontend);
        }
    }
    zctx_destroy (&ctx);
    return NULL;
}
 
int main (void)
{
    //  创建线程
    zctx_t *ctx = zctx_new ();
    void *client = zthread_fork (ctx, client_task, NULL);
    zthread_new (ctx, worker_task, NULL);
    zthread_new (ctx, broker_task, NULL);
 
    //  等待client端管道的信号
    char *signal = zstr_recv (client);
    free (signal);
 
    zctx_destroy (&ctx);
    return 0;
}

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Setting up test...
Synchronous round-trip test...
 9057 calls/second
Asynchronous round-trip test...
 173010 calls/second

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mdcli_t *mdcli_new     (char *broker);
void     mdcli_destroy (mdcli_t **self_p);
int      mdcli_send    (mdcli_t *self, char *service, zmsg_t **request_p);
zmsg_t  *mdcli_recv    (mdcli_t *self);

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/*  =====================================================================
    mdcliapi2.c
 
    Majordomo Protocol Client API (async version)
    Implements the MDP/Worker spec at http://rfc.zeromq.org/spec:7.
 
    ---------------------------------------------------------------------
    Copyright (c) 1991-2011 iMatix Corporation <www.imatix.com>
    Copyright other contributors as noted in the AUTHORS file.
 
    This file is part of the ZeroMQ Guide: http://zguide.zeromq.org
 
    This is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or (at
    your option) any later version.
 
    This software is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
    License along with this program. If not, see
    <http://www.gnu.org/licenses/>.
    =====================================================================
*/
 
#include "mdcliapi2.h"
 
//  类结构
//  使用成员函数访问属性
 
struct _mdcli_t {
    zctx_t *ctx;                //  上下文
    char *broker;
    void *client;               //  连接至代理的套接字
    int verbose;                //  在标准输出打印运行状态
    int timeout;                //  请求超时时间
};
 
 
//  ---------------------------------------------------------------------
//  连接或重连代理
 
void s_mdcli_connect_to_broker (mdcli_t *self)
{
    if (self->client)
        zsocket_destroy (self->ctx, self->client);
    self->client = zsocket_new (self->ctx, ZMQ_DEALER);
    zmq_connect (self->client, self->broker);
    if (self->verbose)
        zclock_log ("I: 正在连接代理 %s...", self->broker);
}
 
 
//  ---------------------------------------------------------------------
//  构造函数
 
mdcli_t *
mdcli_new (char *broker, int verbose)
{
    assert (broker);
 
    mdcli_t *self = (mdcli_t *) zmalloc (sizeof (mdcli_t));
    self->ctx = zctx_new ();
    self->broker = strdup (broker);
    self->verbose = verbose;
    self->timeout = 2500;           //  毫秒
 
    s_mdcli_connect_to_broker (self);
    return self;
}
 
 
//  ---------------------------------------------------------------------
//  析构函数
 
void
mdcli_destroy (mdcli_t **self_p)
{
    assert (self_p);
    if (*self_p) {
        mdcli_t *self = *self_p;
        zctx_destroy (&self->ctx);
        free (self->broker);
        free (self);
        *self_p = NULL;
    }
}
 
 
//  ---------------------------------------------------------------------
//  设置请求超时时间
 
void
mdcli_set_timeout (mdcli_t *self, int timeout)
{
    assert (self);
    self->timeout = timeout;
}
 
 
//  ---------------------------------------------------------------------
//  发送请求给代理
//  取得请求消息的所有权，发送后销毁
 
int
mdcli_send (mdcli_t *self, char *service, zmsg_t **request_p)
{
    assert (self);
    assert (request_p);
    zmsg_t *request = *request_p;
 
    //  在消息顶部加入协议规定的帧
    //  Frame 0: empty (模拟REQ套接字的行为)
    //  Frame 1: "MDPCxy" (6个字节, MDP/Client x.y)
    //  Frame 2: Service name (看打印字符串)
    zmsg_pushstr (request, service);
    zmsg_pushstr (request, MDPC_CLIENT);
    zmsg_pushstr (request, "");
    if (self->verbose) {
        zclock_log ("I: 发送请求给 '%s' 服务:", service);
        zmsg_dump (request);
    }
    zmsg_send (&request, self->client);
    return 0;
}
 
 
//  ---------------------------------------------------------------------
//  获取应答消息，若无则返回NULL；
//  该函数不会尝试从代理的崩溃中恢复，
//  因为我们没有记录那些未收到应答的请求，所以也无法重发。
 
zmsg_t *
mdcli_recv (mdcli_t *self)
{
    assert (self);
 
    //  轮询套接字以获取应答
    zmq_pollitem_t items [] = { { self->client, 0, ZMQ_POLLIN, 0 } };
    int rc = zmq_poll (items, 1, self->timeout * ZMQ_POLL_MSEC);
    if (rc == -1)
        return NULL;            //  中断
 
    //  收到应答后进行处理
    if (items [0].revents & ZMQ_POLLIN) {
        zmsg_t *msg = zmsg_recv (self->client);
        if (self->verbose) {
            zclock_log ("I: received reply:");
            zmsg_dump (msg);
        }
        //  不要处理错误，直接报出
        assert (zmsg_size (msg) >= 4);
 
        zframe_t *empty = zmsg_pop (msg);
        assert (zframe_streq (empty, ""));
        zframe_destroy (&empty);
 
        zframe_t *header = zmsg_pop (msg);
        assert (zframe_streq (header, MDPC_CLIENT));
        zframe_destroy (&header);
 
        zframe_t *service = zmsg_pop (msg);
        zframe_destroy (&service);
 
        return msg;     //  Success
    }
    if (zctx_interrupted)
        printf ("W: 收到中断消息，正在中止client...n");
    else
    if (self->verbose)
        zclock_log ("W: 严重错误，放弃请求");
 
    return NULL;
}

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//
//  异步管家模式 - client示例程序
//  使用mdcli API隐藏MDP协议的具体实现
//
//  直接编译源码，而不创建类库
#include "mdcliapi2.c"
 
int main (int argc, char *argv [])
{
    int verbose = (argc > 1 && streq (argv [1], "-v"));
    mdcli_t *session = mdcli_new ("tcp://localhost:5555", verbose);
 
    int count;
    for (count = 0; count < 100000; count++) {
        zmsg_t *request = zmsg_new ();
        zmsg_pushstr (request, "Hello world");
        mdcli_send (session, "echo", &request);
    }
    for (count = 0; count < 100000; count++) {
        zmsg_t *reply = mdcli_recv (session);
        if (reply)
            zmsg_destroy (&reply);
        else
            break;              //  使用Ctrl-C中断
    }
    printf ("收到 %d 个应答n", count);
    mdcli_destroy (&session);
    return 0;
}

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$ time mdclient
100000 requests/replies processed

real    0m14.088s
user    0m1.310s
sys     0m2.670s

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$ time mdclient2
100000 replies received

real    0m8.730s
user    0m0.920s
sys     0m1.550s

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$ time mdclient2
100000 replies received

real    0m3.863s
user    0m0.730s
sys     0m0.470s