The Diffraction Grating Calculator

// SingleLogger.h: interface for the singleton CSingleLogger class.
//
//////////////////////////////////////////////////////////////////////

#ifndef SINGLELOGGER_H
#define SINGLELOGGER_H

/* disable MSVC warnings about STL in debug mode */
#if _MSC_VER > 1000
#pragma warning (disable: 4786)
#pragma warning (disable: 4748)
#pragma warning (disable: 4103)
#endif /* _MSC_VER > 1000 */

#include "TraceLevels.h"
#include "TGuard.h"
#include "MSMutex.h"
#include "NullMutex.h"

#define LOCK_SYNC_NAME _T("TheTracingMutex")
/* System wide default global Sync Object (e.g. Mutex) name */

class CSingleLogger /* this class is a (Meyer) Singleton! */
{
public:
	static CSingleLogger* GetInstance();
	static bool IsCSingleLoggerEnabled;
	void Trace(unsigned short nTraceLevel, const TCHAR * pszFormat, ...);
	// The client MUST set parameters before using the logger, but we just
	// use defaults otherwise.
	void EnableTracing(bool bEnable);
	void SetParameters(unsigned long nTimeOut, const TCHAR* sFileName, int nTraceLvl);
	bool AreParametersSet(void);
	void LoadDefaults();
	void CheckAndSetTraceFileName(const TCHAR *sFileName);

private:
	CSingleLogger();
	~CSingleLogger();

	static CSingleLogger* SingleInstance; /* this class is a Singleton! */

	unsigned long CheckLockTimeOut(unsigned long nTimeOut);
	int           CheckTraceLevel(int nTraceLvl);

	bool          DiscriminateLevel(int nTraceLevel);

	CString m_szTraceFileName;
	unsigned long m_nLockTimeOut;
	int m_nTraceLevel;

	bool m_bAreParametersSet;

/* Strategized Scoped Locking pattern (equivalent to MFC CSingleLock) */
/* Note: DO use a mutex for the LOCK object */
// Lock object used for sync access to shared logger
#ifdef _WIN32
	CMSMutex* m_aLock;
#else
	CNullMutex* m_aLock;
#endif
};

#endif /* ! defined SINGLELOGGER_H */