C++デザインパターン_オブザーバリスナーモード

3076 ワード
C++ 
#include 
#include 
#include 
#include 
#include 
using namespace std;

//          
class Listener
{
public:
	Listener(string str):_str(str){}
	virtual void HandleMessage(int imessage) const = 0;
protected:
	string _str;
};

class TestListener1:public Listener
{
public:
	TestListener1(string str):Listener(str){}
	virtual void HandleMessage(int imessage) const
	{
		cout << "Listener name:" << _str << endl;
		switch(imessage)
		{
		case 1:
			cout << "1 resv!" << endl;
			break;
		case 2:
			cout << "2 resv!" << endl;
			break;
		case 3:
			cout << "3 resv!" << endl;
			break;
		default:
			break;
		}
	}
};

class TestListener2:public Listener
{
public:
	TestListener2(string str):Listener(str){}
	virtual void HandleMessage(int imessage) const
	{
		cout << "Listener name:" << _str << endl;
		switch(imessage)
		{
		case 1:
			cout << "1 resv!" << endl;
			break;
		case 2:
			cout << "2 resv!" << endl;
			break;
		case 3:
			cout << "3 resv!" << endl;
			break;
		default:
			break;
		}
	}
};

class TestListener3:public Listener
{
public:
	TestListener3(string str):Listener(str){}
	virtual void HandleMessage(int imessage) const
	{
		cout << "Listener name:" << _str << endl;
		switch(imessage)
		{
		case 1:
			cout << "1 resv!" << endl;
			break;
		case 2:
			cout << "2 resv!" << endl;
			break;
		case 3:
			cout << "3 resv!" << endl;
			break;
		default:
			break;
		}
	}
};

class Observe
{
public:
	static void RegisterMessage(const Listener* inlistener, int imessage)
	{
		map>::iterator it = _map.find(imessage);
		if (it == _map.end())
		{
			_map[imessage].push_back(inlistener);
		}
		else
		{
			it->second.push_back(inlistener);
		}
	}
	static void HandleMessage(int imessage)
	{
		map>::iterator it = _map.find(imessage);
		if (it == _map.end())
		{
			cout << "no Listener interst" << endl;
			return ;
		}
		vector::iterator vit = it->second.begin();
		for (vit; vit!=it->second.end(); ++vit)
		{
			(*vit)->HandleMessage(imessage);
		}
	}
private:
	static map> _map;
};
map>Observe::_map;

int main()
{
	TestListener1 listener1("listener1");
	TestListener2 listener2("listener2");
	TestListener3 listener3("listener3");
	Observe ob;

	ob.RegisterMessage(&listener1, 1);
	ob.RegisterMessage(&listener1, 2);

	ob.RegisterMessage(&listener2, 1);
	ob.RegisterMessage(&listener2, 3);

	ob.RegisterMessage(&listener3, 2);
	ob.RegisterMessage(&listener3, 3);

	ob.HandleMessage(1);
	ob.HandleMessage(2);
	ob.HandleMessage(3);

	return 0;
}
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