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【数据库开发】C++测试redis中的publish/subscribe

运用

http://blog.csdn.net/xumaojun/article/details/51558237 中的redis_publisher.hredis_publisher.cpp
 redis_subscriber.h redis_subscriber.cpp四个文件,做一个操作类进行测试.

头文件 Policy.h

#pragma once  
#include "redis_publisher.h"  
#include "redis_subscriber.h"  
#include <iostream>  
  
using namespace std;  
  
class Policy  
{  
public:  
    Policy();  
    ~Policy();  
    void publish();  
    static void recieve_message(const char *channel_name,const char *message, int len);  
  
    CRedisPublisher publisher;  
    CRedisSubscriber subscriber;  
};

代码文件 Policy.cpp

#include "Policy.h"  
  
Policy::Policy()  
{  
    bool ret = publisher.init();  
    if (!ret) {  
        printf("Init failed.
");  
  
    }  
  
    ret = publisher.connect();  
    if (!ret) {  
        printf("connect failed.");  
  
    }  
  
    //***********************************  
    CRedisSubscriber::NotifyMessageFn fn =  
        bind(recieve_message, std::tr1::placeholders::_1,  
             std::tr1::placeholders::_2, std::tr1::placeholders::_3);  
  
    bool ret1 = subscriber.init(fn);  
    if (!ret1) {  
        printf("Init failed.
");  
    }  
  
    ret1 = subscriber.connect();  
    if (!ret1) {  
        printf("Connect failed.
");  
    }  
    subscriber.subscribe("test-channel");  
}  
  
Policy::~Policy()  
{  
    publisher.disconnect();  
    publisher.uninit();  
  
    subscriber.disconnect();  
    subscriber.uninit();  
}  
  
  
void Policy::publish()  
{  
    cout<<"Policy::publish()...
"<<endl;  
    publisher.publish("test-channel", "Test message");  
}  
  
  
void Policy::recieve_message(const char *channel_name,  
    const char *message, int len)  
{  
    printf("Recieve message:    channel name: %s    message: %s
",  
        channel_name, message);  
}

测试文件 testPolicy.cpp

#include "Policy.h"  
int main(int argc, char *argv[])  
{  
    Policy m_policy;  
    int i=0;  
    while(i<8){  
        m_policy.publish();  
        sleep(2);  
        cout<<"main sleep...
";  
        i++;  
    }  
    return 0;  
}

Makefile

EXE=server_main client_main    
CC=g++    
FLAG=-lhiredis -levent -pthread    
OBJ=redis_publisher.o redis_subscriber.o Policy.o testPolicy.o    
  
  
all:$(EXE)  
  
$(EXE):$(OBJ)  
    $(CC) -o testPolicy  redis_publisher.o redis_subscriber.o Policy.o testPolicy.o  $(FLAG)  
    
redis_publisher.o:redis_publisher.h  
redis_subscriber.o:redis_subscriber.h  
  
Policy.o:Policy.h

这样编译之后,可以自发自收.

本例的用途在于可以简单地在项目中实现异构的数据收发.

附上原作代码:

redis_publisher.h

/*************************************************************************  
    > File Name: redis_publisher.h  
    > Author: chenzengba  
    > Mail: chenzengba@gmail.com   
    > Created Time: Sat 23 Apr 2016 10:15:09 PM CST  
    > Description: 封装hiredis，实现消息发布给redis功能  
 ************************************************************************/    
    
#ifndef REDIS_PUBLISHER_H    
#define REDIS_PUBLISHER_H    
    
#include <stdlib.h>    
#include <hiredis/async.h>    
#include <hiredis/adapters/libevent.h>    
#include <string>    
#include <vector>    
#include <unistd.h>    
#include <pthread.h>    
#include <semaphore.h>    
#include <boost/tr1/functional.hpp>    
    
class CRedisPublisher    
{    
public:        
    CRedisPublisher();    
    ~CRedisPublisher();    
    
    bool init();    
    bool uninit();    
    bool connect();    
    bool disconnect();    
        
    bool publish(const std::string &channel_name,     
        const std::string &message);    
    
private:    
     // 下面三个回调函数供redis服务调用    
    // 连接回调    
    static void connect_callback(const redisAsyncContext *redis_context,    
        int status);    
        
    // 断开连接的回调    
    static void disconnect_callback(const redisAsyncContext *redis_context,    
        int status);    
    
    // 执行命令回调    
    static void command_callback(redisAsyncContext *redis_context,    
        void *reply, void *privdata);    
    
    // 事件分发线程函数    
    static void *event_thread(void *data);    
    void *event_proc();    
    
private:    
     // libevent事件对象    
    event_base *_event_base;    
    // 事件线程ID    
    pthread_t _event_thread;    
    // 事件线程的信号量    
    sem_t _event_sem;    
    // hiredis异步对象    
    redisAsyncContext *_redis_context;    
};

redis_publisher.cpp

/*************************************************************************  
    > File Name: redis_publisher.cpp  
    > Author: chenzengba  
    > Mail: chenzengba@gmail.com   
    > Created Time: Sat 23 Apr 2016 10:15:09 PM CST  
    > Description:   
 ************************************************************************/    
     
#include <stddef.h>    
#include <assert.h>    
#include <string.h>    
#include "redis_publisher.h"    
    
CRedisPublisher::CRedisPublisher():_event_base(0), _event_thread(0),    
_redis_context(0)    
{    
}    
    
CRedisPublisher::~CRedisPublisher()    
{    
}    
    
bool CRedisPublisher::init()    
{    
    // initialize the event    
    _event_base = event_base_new();    // 创建libevent对象    
    if (NULL == _event_base)    
    {    
        printf(": Create redis event failed.
");    
        return false;    
    }    
    
    memset(&_event_sem, 0, sizeof(_event_sem));    
    int ret = sem_init(&_event_sem, 0, 0);    
    if (ret != 0)    
    {    
        printf(": Init sem failed.
");    
        return false;    
    }    
    
    return true;    
}    
    
bool CRedisPublisher::uninit()    
{    
    _event_base = NULL;    
        
    sem_destroy(&_event_sem);       
    return true;    
}    
    
bool CRedisPublisher::connect()    
{    
    // connect redis    
    _redis_context = redisAsyncConnect("127.0.0.1", 6379);    // 异步连接到redis服务器上，使用默认端口    
    if (NULL == _redis_context)    
    {    
        printf(": Connect redis failed.
");    
        return false;    
    }    
    
    if (_redis_context->err)    
    {    
        printf(": Connect redis error: %d, %s
",     
            _redis_context->err, _redis_context->errstr);    // 输出错误信息    
        return false;    
    }    
    
    // attach the event    
    redisLibeventAttach(_redis_context, _event_base);    // 将事件绑定到redis context上，使设置给redis的回调跟事件关联    
        
    // 创建事件处理线程    
    int ret = pthread_create(&_event_thread, 0, &CRedisPublisher::event_thread, this);    
    if (ret != 0)    
    {    
        printf(": create event thread failed.
");    
        disconnect();    
        return false;    
    }    
    
    // 设置连接回调，当异步调用连接后，服务器处理连接请求结束后调用，通知调用者连接的状态    
    redisAsyncSetConnectCallback(_redis_context,     
        &CRedisPublisher::connect_callback);    
    
    // 设置断开连接回调，当服务器断开连接后，通知调用者连接断开，调用者可以利用这个函数实现重连    
    redisAsyncSetDisconnectCallback(_redis_context,    
        &CRedisPublisher::disconnect_callback);    
    
    // 启动事件线程    
    sem_post(&_event_sem);    
    return true;    
}    
    
bool CRedisPublisher::disconnect()    
{    
    if (_redis_context)    
    {    
        redisAsyncDisconnect(_redis_context);    
        redisAsyncFree(_redis_context);    
        _redis_context = NULL;    
    }    
    
    return true;    
}    
    
bool CRedisPublisher::publish(const std::string &channel_name,    
    const std::string &message)    
{    
    int ret = redisAsyncCommand(_redis_context,     
        &CRedisPublisher::command_callback, this, "PUBLISH %s %s",     
        channel_name.c_str(), message.c_str());    
    if (REDIS_ERR == ret)    
    {    
        printf("Publish command failed: %d
", ret);    
        return false;    
    }    
    
    return true;    
}    
    
void CRedisPublisher::connect_callback(const redisAsyncContext *redis_context,    
    int status)    
{    
    if (status != REDIS_OK)    
    {    
        printf(": Error: %s
", redis_context->errstr);    
    }    
    else    
    {    
        printf(": Redis connected!
");    
    }    
}    
    
void CRedisPublisher::disconnect_callback(    
    const redisAsyncContext *redis_context, int status)    
{    
    if (status != REDIS_OK)    
    {    
        // 这里异常退出，可以尝试重连    
        printf(": Error: %s
", redis_context->errstr);    
    }    
}    
    
// 消息接收回调函数    
void CRedisPublisher::command_callback(redisAsyncContext *redis_context,    
    void *reply, void *privdata)    
{    
    printf("command callback.
");    
    // 这里不执行任何操作    
}    
    
void *CRedisPublisher::event_thread(void *data)    
{    
    if (NULL == data)    
    {    
        printf(": Error!
");    
        assert(false);    
        return NULL;    
    }    
    
    CRedisPublisher *self_this = reinterpret_cast<CRedisPublisher *>(data);    
    return self_this->event_proc();    
}    
    
void *CRedisPublisher::event_proc()    
{    
    sem_wait(&_event_sem);    
        
    // 开启事件分发，event_base_dispatch会阻塞    
    event_base_dispatch(_event_base);    
    
    return NULL;    
}

redis_subscriber.h

/*************************************************************************  
    > File Name: redis_subscriber.h  
    > Author: chenzengba  
    > Mail: chenzengba@gmail.com   
    > Created Time: Sat 23 Apr 2016 10:15:09 PM CST  
    > Description: 封装hiredis，实现消息订阅redis功能  
 ************************************************************************/    
    
#ifndef REDIS_SUBSCRIBER_H    
#define REDIS_SUBSCRIBER_H    
    
#include <stdlib.h>    
#include <hiredis/async.h>    
#include <hiredis/adapters/libevent.h>    
#include <string>    
#include <vector>    
#include <unistd.h>    
#include <pthread.h>    
#include <semaphore.h>    
#include <boost/tr1/functional.hpp>    
    
class CRedisSubscriber    
{    
public:    
    typedef std::tr1::function<void (const char *, const char *, int)>         NotifyMessageFn;   // 回调函数对象类型，当接收到消息后调用回调把消息发送出去    
            
    CRedisSubscriber();    
    ~CRedisSubscriber();    
        
    bool init(const NotifyMessageFn &fn);   // 传入回调对象    
    bool uninit();    
    bool connect();    
    bool disconnect();    
        
    // 可以多次调用，订阅多个频道    
    bool subscribe(const std::string &channel_name);    
        
private:    
    // 下面三个回调函数供redis服务调用    
    // 连接回调    
    static void connect_callback(const redisAsyncContext *redis_context,    
        int status);    
        
    // 断开连接的回调    
    static void disconnect_callback(const redisAsyncContext *redis_context,    
        int status);    
    
    // 执行命令回调    
    static void command_callback(redisAsyncContext *redis_context,    
        void *reply, void *privdata);    
    
    // 事件分发线程函数    
    static void *event_thread(void *data);    
    void *event_proc();    
        
private:    
    // libevent事件对象    
    event_base *_event_base;    
    // 事件线程ID    
    pthread_t _event_thread;    
    // 事件线程的信号量    
    sem_t _event_sem;    
    // hiredis异步对象    
    redisAsyncContext *_redis_context;    
        
    // 通知外层的回调函数对象    
    NotifyMessageFn _notify_message_fn;    
};

redis_subscriber.cpp

/*************************************************************************  
    > File Name: redis_subscriber.cpp  
    > Author: chenzengba  
    > Mail: chenzengba@gmail.com   
    > Created Time: Sat 23 Apr 2016 10:15:09 PM CST  
    > Description:   
 ************************************************************************/    
     
#include <stddef.h>    
#include <assert.h>    
#include <string.h>    
#include "redis_subscriber.h"    
    
CRedisSubscriber::CRedisSubscriber():_event_base(0), _event_thread(0),    
_redis_context(0)    
{    
}    
    
CRedisSubscriber::~CRedisSubscriber()    
{    
}    
    
bool CRedisSubscriber::init(const NotifyMessageFn &fn)    
{    
    // initialize the event    
    _notify_message_fn = fn;    
    _event_base = event_base_new();    // 创建libevent对象    
    if (NULL == _event_base)    
    {    
        printf(": Create redis event failed.
");    
        return false;    
    }    
    
    memset(&_event_sem, 0, sizeof(_event_sem));    
    int ret = sem_init(&_event_sem, 0, 0);    
    if (ret != 0)    
    {    
        printf(": Init sem failed.
");    
        return false;    
    }    
    
    return true;    
}    
    
bool CRedisSubscriber::uninit()    
{    
    _event_base = NULL;    
        
    sem_destroy(&_event_sem);       
    return true;    
}    
    
bool CRedisSubscriber::connect()    
{    
    // connect redis    
    _redis_context = redisAsyncConnect("127.0.0.1", 6379);    // 异步连接到redis服务器上，使用默认端口    
    if (NULL == _redis_context)    
    {    
        printf(": Connect redis failed.
");    
        return false;    
    }    
    
    if (_redis_context->err)    
    {    
        printf(": Connect redis error: %d, %s
",     
            _redis_context->err, _redis_context->errstr);    // 输出错误信息    
        return false;    
    }    
    
    // attach the event    
    redisLibeventAttach(_redis_context, _event_base);    // 将事件绑定到redis context上，使设置给redis的回调跟事件关联    
        
    // 创建事件处理线程    
    int ret = pthread_create(&_event_thread, 0, &CRedisSubscriber::event_thread, this);    
    if (ret != 0)    
    {    
        printf(": create event thread failed.
");    
        disconnect();    
        return false;    
    }    
    
    // 设置连接回调，当异步调用连接后，服务器处理连接请求结束后调用，通知调用者连接的状态    
    redisAsyncSetConnectCallback(_redis_context,     
        &CRedisSubscriber::connect_callback);    
    
    // 设置断开连接回调，当服务器断开连接后，通知调用者连接断开，调用者可以利用这个函数实现重连    
    redisAsyncSetDisconnectCallback(_redis_context,    
        &CRedisSubscriber::disconnect_callback);    
    
    // 启动事件线程    
    sem_post(&_event_sem);    
    return true;    
}    
    
bool CRedisSubscriber::disconnect()    
{    
    if (_redis_context)    
    {    
        redisAsyncDisconnect(_redis_context);    
        redisAsyncFree(_redis_context);    
        _redis_context = NULL;    
    }    
    
    return true;    
}    
    
bool CRedisSubscriber::subscribe(const std::string &channel_name)    
{    
    int ret = redisAsyncCommand(_redis_context,     
        &CRedisSubscriber::command_callback, this, "SUBSCRIBE %s",     
        channel_name.c_str());    
    if (REDIS_ERR == ret)    
    {    
        printf("Subscribe command failed: %d
", ret);    
        return false;    
    }    
        
    printf(": Subscribe success: %s
", channel_name.c_str());    
    return true;    
}    
    
void CRedisSubscriber::connect_callback(const redisAsyncContext *redis_context,    
    int status)    
{    
    if (status != REDIS_OK)    
    {    
        printf(": Error: %s
", redis_context->errstr);    
    }    
    else    
    {    
        printf(": Redis connected!");    
    }    
}    
    
void CRedisSubscriber::disconnect_callback(    
    const redisAsyncContext *redis_context, int status)    
{    
    if (status != REDIS_OK)    
    {    
        // 这里异常退出，可以尝试重连    
        printf(": Error: %s
", redis_context->errstr);    
    }    
}    
    
// 消息接收回调函数    
void CRedisSubscriber::command_callback(redisAsyncContext *redis_context,    
    void *reply, void *privdata)    
{    
    if (NULL == reply || NULL == privdata) {    
        return ;    
    }    
    
    // 静态函数中，要使用类的成员变量，把当前的this指针传进来，用this指针间接访问    
    CRedisSubscriber *self_this = reinterpret_cast<CRedisSubscriber *>(privdata);    
    redisReply *redis_reply = reinterpret_cast<redisReply *>(reply);    
        
    // 订阅接收到的消息是一个带三元素的数组    
    if (redis_reply->type == REDIS_REPLY_ARRAY &&    
    redis_reply->elements == 3)    
    {    
        printf(": Recieve message:%s:%d:%s:%d:%s:%d
",    
        redis_reply->element[0]->str, redis_reply->element[0]->len,    
        redis_reply->element[1]->str, redis_reply->element[1]->len,    
        redis_reply->element[2]->str, redis_reply->element[2]->len);    
            
        // 调用函数对象把消息通知给外层    
        self_this->_notify_message_fn(redis_reply->element[1]->str,    
            redis_reply->element[2]->str, redis_reply->element[2]->len);    
    }    
}    
    
void *CRedisSubscriber::event_thread(void *data)    
{    
    if (NULL == data)    
    {    
        printf(": Error!
");    
        assert(false);    
        return NULL;    
    }    
    
    CRedisSubscriber *self_this = reinterpret_cast<CRedisSubscriber *>(data);    
    return self_this->event_proc();    
}    
    
void *CRedisSubscriber::event_proc()    
{    
    sem_wait(&_event_sem);    
        
    // 开启事件分发，event_base_dispatch会阻塞    
    event_base_dispatch(_event_base);    
    
    return NULL;    
}

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原文地址：https://www.cnblogs.com/huty/p/8517415.html

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