chxkeepalive.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
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 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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#ifndef CHXKEEPALIVE_H
#define CHXKEEPALIVE_H

#include "hxresult.h"
#include "hxcom.h"

class CHXKeepAliveImp;
_INTERFACE IHXScheduler;
_INTERFACE IHXCallback;

/*
 * CHXKeepAlive
 * This object implements basic keepalive functionallity. The object
 * is initialized with a IHXScheduler, a keepalive timeout, and a keepalive
 * callback. Anytime that activity occurs, OnActivity() should be called.
 * If a timeout interval goes by without receiving an OnActivity() call,
 * this object calls the keepalive callback passed in the Init() call.
 */

class CHXKeepAlive
{
public:
    CHXKeepAlive();
    ~CHXKeepAlive();
    
    HX_RESULT Init(IHXScheduler* pSched, 
		   UINT32 timeoutMS, 
		   IHXCallback* pKeepAliveCB);

    void OnActivity();  // Called when any activity has occured
    void reset();       // Clears the state of this object

private:
    CHXKeepAliveImp* m_pImp;
};

#endif /* CHXKEEPALIVE_H */