【练手】reactor模式

测试代码之Reactor模式

class Handler
{
public:
	virtual void OnRead(SOCKET s) = 0;
	virtual void OnSend(SOCKET s) = 0;
	virtual void OnAccept(SOCKET s) = 0;
};

class Reactor
{
public:
	typedef std::map<SOCKET,Handler*>	HANDLERLIST;
	typedef std::map<SOCKET,Handler*>::iterator  HANDLERLIST_ITER;
public:
	void RegisterHandler(SOCKET sock,Handler* handler)
	{
		m_HandlerList.insert(std::make_pair(sock,handler));
	}

	void RemoveHandler(SOCKET sock)
	{
		HANDLERLIST_ITER iter = m_HandlerList.find(sock);
		if ( iter != m_HandlerList.end() )
		{
			m_HandlerList.erase(iter);
		}
	}

	void Poll()
	{
		while(true)
		{
			fd_set rset,wset;
			FD_ZERO(&rset);
			FD_ZERO(&wset);

			HANDLERLIST_ITER iter = m_HandlerList.begin();
			for( ; iter != m_HandlerList.end(); iter++ )
			{
				FD_SET(iter->first,&rset);
				FD_SET(iter->first,&wset);
			}

			timeval time_val;
			time_val.tv_sec = 0;
			time_val.tv_usec = 600;

			if ( 0 == select(0,&rset,&wset,&time_val))
			{
				//time out
				continue;
			}

			for(int i = 0; i < rset.fd_count; i++)
			{
				if(FD_ISSET(rset.fd_array[i],&rset))
				{
					HANDLERLIST_ITER iter = m_HandlerList.find(rset.fd_array[i]);
					if( iter != m_HandlerList.end() )
					{
						iter->second->OnRead(rset.fd_array[i]);
					}
				}
			}

			for(int i = 0; i < wset.fd_count; i++)
			{
				if(FD_ISSET(wset.fd_array[i],&wset))
				{
					HANDLERLIST_ITER iter = m_HandlerList.find(rset.fd_array[i]);
					if( iter != m_HandlerList.end() )
					{
						iter->second->OnSend(rset.fd_array[i]);
					}
				}
			}
		}
	}

private:
	HANDLERLIST			m_HandlerList;
};

Reactor			g_reactor;

class MyHandler : public Handler
{
public:
	MyHandler()	{

	}

public:
	virtual void OnRead(SOCKET s)
	{
		cout<<"can recv "<< s <<endl;

		char buff[256] = {0};
		int len = ::recv(s,buff,256,0 );
		if(len > 0)
		{
			cout<<"socket " << m_index <<" recv" <<buff<<endl;
		}
		else
		{
			g_reactor.RemoveHandler(s);
		}
	}

	virtual void OnSend(SOCKET s)
	{
	//	cout<<"can send "<< s <<endl;
	}

	virtual void OnAccept(SOCKET s)
	{
	//	cout<<"can accept "<< s <<endl;
	}
};

（编辑：李大同）

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