C++设计模式中的观察者模式一起来看看
设计模式：观察者模式
观察者模式也称发布订阅模式，发布者发布消息，订阅者接收消息。
发布者接口
#ifndef __observerPatterns_publish_hpp__
#define __observerPatterns_publish_hpp__
#include "observerPatterns_subscribe.hpp"
class observerPatterns_publish
{
public:
virtual void registerObjectSubscribe(observerPatterns_subscribe *ops) = 0;
virtual void removeObjectSubscribe(observerPatterns_subscribe *ops) = 0;
virtual void notifyObjectSubscribe() = 0;
};
#endif
订阅者接口
#ifndef __observerPatterns_subscribe_hpp__
#define __observerPatterns_subscribe_hpp__
#include "observerPatterns_common.hpp"
class observerPatterns_subscribe
{
public:
virtual void update(const observerPatterns_msgPackage &opmp) = 0;
};
#endif
发布者类
#ifndef __observerPatterns_object_publish_hpp__
#define __observerPatterns_object_publish_hpp__
#include <unordered_set>
#include "observerPatterns_publish.hpp"
class observerPatterns_object_publish : public observerPatterns_publish
{
private:
observerPatterns_msgPackage _opmp;
std::unordered_set<observerPatterns_subscribe *> _subscribeObjectBucket;
public:
observerPatterns_object_publish();
~observerPatterns_object_publish();
void registerObjectSubscribe(observerPatterns_subscribe *ops);
void removeObjectSubscribe(observerPatterns_subscribe *ops);
void notifyObjectSubscribe();
void setMsgPackage(const observerPatterns_msgPackage &opmp);
};
observerPatterns_object_publish::observerPatterns_object_publish()
{
}
observerPatterns_object_publish::~observerPatterns_object_publish()
{
}
void observerPatterns_object_publish::registerObjectSubscribe(observerPatterns_subscribe *ops)
{
_subscribeObjectBucket.insert(ops);
}
void observerPatterns_object_publish::removeObjectSubscribe(observerPatterns_subscribe *ops)
{
_subscribeObjectBucket.erase(ops);
}
void observerPatterns_object_publish::notifyObjectSubscribe()
{
for (auto &&_sob : _subscribeObjectBucket)
_sob->update(_opmp);
}
void observerPatterns_object_publish::setMsgPackage(const observerPatterns_msgPackage &opmp)
{
_opmp = opmp;
notifyObjectSubscribe();
}
#endif
订阅者类
#ifndef __observerPatterns_object_subscribe_hpp__
#define __observerPatterns_object_subscribe_hpp__
#include "observerPatterns_publish.hpp"
#include "observerPatterns_subscribe.hpp"
class observerPatterns_object_subscribe : public observerPatterns_subscribe
{
private:
observerPatterns_msgPackage _opmp;
observerPatterns_publish *_opb;
public:
observerPatterns_object_subscribe(observerPatterns_publish *opb);
~observerPatterns_object_subscribe();
void update(const observerPatterns_msgPackage &opmp);
};
observerPatterns_object_subscribe::observerPatterns_object_subscribe(observerPatterns_publish *opb)
:_opb(opb)
{
_opb->registerObjectSubscribe(this);
}
observerPatterns_object_subscribe::~observerPatterns_object_subscribe()
{
_opb->removeObjectSubscribe(this);
}
void observerPatterns_object_subscribe::update(const observerPatterns_msgPackage &opmp)
{
_opmp = opmp;
printf("url:%s, msg:%s\n", _opmp.url.c_str(), _opmp.msg.c_str());
}
#endif
#ifndef __observerPatterns_object_subscribe2_hpp__
#define __observerPatterns_object_subscribe2_hpp__
#include "observerPatterns_publish.hpp"
#include "observerPatterns_subscribe.hpp"
class observerPatterns_object_subscribe2 : public observerPatterns_subscribe
{
private:
observerPatterns_msgPackage _opmp;
observerPatterns_publish *_opb;
public:
observerPatterns_object_subscribe2(observerPatterns_publish *opb);
~observerPatterns_object_subscribe2();
void update(const observerPatterns_msgPackage &opmp);
};
observerPatterns_object_subscribe2::observerPatterns_object_subscribe2(observerPatterns_publish *opb)
:_opb(opb)
{
_opb->registerObjectSubscribe(this);
}
observerPatterns_object_subscribe2::~observerPatterns_object_subscribe2()
{
_opb->removeObjectSubscribe(this);
}
void observerPatterns_object_subscribe2::update(const observerPatterns_msgPackage &opmp)
{
_opmp = opmp;
printf("url:%s, msg:%s\n", _opmp.url.c_str(), _opmp.msg.c_str());
}
#endif
公共头文件
#ifndef __observerPatterns_common_hpp__
#define __observerPatterns_common_hpp__
#include <string>
struct observerPatterns_msgPackage
{
std::string url;
std::string msg;
};
typedef struct observerPatterns_msgPackage observerPatterns_msgPackage;
#endif
主函数测试
/************************************************************************
> File Name: observerPatterns_main.cpp
> Author:
> Mail:
> Created Time:
************************************************************************/
#include "observerPatterns_common.hpp"
#include "observerPatterns_object_publish.hpp"
#include "observerPatterns_object_subscribe.hpp"
#include "observerPatterns_object_subscribe2.hpp"
using namespace std;
int main(int argc, char *argv[])
{
observerPatterns_object_publish *opop = new observerPatterns_object_publish;
observerPatterns_msgPackage opmp1, opmp2;
opmp1.url = "www.aaa.com";
opmp1.msg = "Hello!";
opmp2.url = "www.xyzxyz.com";
opmp2.msg = "Hello, observerPatterns!";
observerPatterns_object_subscribe *oposa = new observerPatterns_object_subscribe(opop);
observerPatterns_object_subscribe *oposb = new observerPatterns_object_subscribe(opop);
observerPatterns_object_subscribe2 *oposc = new observerPatterns_object_subscribe2(opop);
observerPatterns_object_subscribe2 *oposd = new observerPatterns_object_subscribe2(opop);
opop->setMsgPackage(opmp1);
opop->setMsgPackage(opmp2);
delete oposa;
delete opop;
return 0;
}
