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[POSA2] Wrapper Facade

2009-08-01 08:55:09| 分类： POSA | 标签： |举报 |字号大中小订阅

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对底层的 API 进行封装，隔离平台差异，让上层逻辑不需要关心底层细节。让代码中不会出现 #ifdef WIN32 ... #else ... #endif 这类东西。

如何做好 wrapper，要求写 wrapper class 的程序员有丰富的经验，以及对各个不同平台的细节都有深入了解。

一个典型的 Mutex 的例子：
// win32 version
class Thread_Mutex {
public:
   Thread_Mutex()   { InitializeCriticalSection(&mutex_); }
   ~Thread_Mutex()   { DeleteCriticalSection(&mutex_); }

   void acquire() { EnterCriticalSection(&mutex_); }
   void release() { LeaveCriticalSection(&mutex_); }

private:
   CRITICAL_SECTION mutex_;

   Thread_Mutex (const Thread_Mutex &);
   void operator= (const Thread_Mutex &);
};

对应的，我们可以写出 linux/solaris 下 Thread_Mutex 的实现，但保持接口都一致。

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