Active Object C++實現

// ActiveObject.cpp : 定義控制台應用程式的進入點。//#include "stdafx.h"#include <Windows.h>#include <deque>#include <iostream>using namespace std;double secondsPerTick = 0;class Command{public:virtual void Execute()=0;};class ActiveObjectEngine{deque<Command*> itsCommands;public:void AddCommand(Command* c){itsCommands.push_back(c);}void Run(){while (itsCommands.size()>0){Command* c = itsCommands.front();c->Execute();itsCommands.pop_front();}}};class SleepCommmand : public Command{Command* wakeupCommand;ActiveObjectEngine * engine;double sleepTime;bool started;LARGE_INTEGER lv;double start_time;public:SleepCommmand(double milliseconds, ActiveObjectEngine* e, Command* wc): started(false){sleepTime = milliseconds;engine = e;wakeupCommand = wc;}virtual void Execute(){QueryPerformanceCounter( &lv );double current_time = secondsPerTick * lv.QuadPart;if (!started){started = true;start_time = current_time;engine->AddCommand(this);}else{double elasped_time = current_time - start_time;if (elasped_time < sleepTime){engine->AddCommand(this);Sleep(1);}else{engine->AddCommand(wakeupCommand);}}}};class WakeupCommand : public Command{bool excuted;public:WakeupCommand(){excuted = false;}virtual void Execute(){LARGE_INTEGER lv;QueryPerformanceCounter( &lv );double current_time = secondsPerTick * lv.QuadPart;excuted = true;cout<<"\n*********\nExcuted!\n***********"<<current_time;}};class DelayedTyper : public Command{public:double itsDelay;char itsChar;static bool stop;static ActiveObjectEngine* engine;DelayedTyper(double delay, char c){itsDelay = delay;itsChar = c;}virtual void Execute(){cout<<itsChar;if (!stop){DelayAndRepeat();}}void DelayAndRepeat(){engine->AddCommand(new SleepCommmand(itsDelay,engine,this));}};bool DelayedTyper::stop = false;ActiveObjectEngine* DelayedTyper::engine = new ActiveObjectEngine;class StopCommand : public Command{public:virtual void Execute(){DelayedTyper::stop = true;}};int _tmain(int argc, _TCHAR* argv[]){LARGE_INTEGER lv;QueryPerformanceFrequency( &lv );secondsPerTick = 1.0 / lv.QuadPart;QueryPerformanceCounter( &lv );double current_time = secondsPerTick * lv.QuadPart;//One shot// WakeupCommand* wakup = new WakeupCommand();// ActiveObjectEngine* e =  new ActiveObjectEngine();// SleepCommmand* c = new SleepCommmand(6,e,wakup);// e->AddCommand(c);// cout<<"Start...:"<<current_time;// e->Run();// Periodic DelayedTyper::engine->AddCommand(new DelayedTyper(0.1,'1'));DelayedTyper::engine->AddCommand(new DelayedTyper(1,'2'));DelayedTyper::engine->AddCommand(new DelayedTyper(3,'3'));Command* stop_command = new StopCommand;DelayedTyper::engine->AddCommand(new SleepCommmand(10,DelayedTyper::engine,stop_command));DelayedTyper::engine->Run();return 0;}