Class KeyCache

libcppcryptfs/util/KeyCache.h:112–143

class KeyCache
{
public:
	typedef unsigned long long id_t;
private:
	mutex m_mutex;
	unordered_map<id_t, KeyCacheEntry> m_entries;
	id_t m_cur_id;  // we increment it and assign as unique id for registered clients
	int m_valid_count;
	bool m_enabled;
	KeyCache();
	void ClearInternal(bool disable);
	bool InitClearThread();
	HANDLE m_clearEvent;
	HANDLE m_clearThread;
public:	
	static KeyCache* GetInstance();
	id_t Register(DWORD buf_size);
	bool Unregister(id_t id);
	void Enable();
	void Clear() { ClearInternal(false); }
	void Disable() { ClearInternal(true); }
	bool Store(id_t id, const BYTE* ptr, size_t len);
	bool Retrieve(id_t id, const vector<KeyBuf>& kbmb);
	void StopClearThread();

	virtual ~KeyCache();

	// disallow copying
	KeyCache(KeyCache const&) = delete;
	void operator=(KeyCache const&) = delete;
};