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game/server/timedeventmgr.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef TIMEDEVENTMGR_H
+#define TIMEDEVENTMGR_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "utlpriorityqueue.h"
+
+
+//
+//
+// These classes provide fast timed event callbacks. To use them, make a CTimedEventMgr
+// and put CEventRegister objects in your objects that want the timed events.
+//
+//
+
+
+class CTimedEventMgr;
+
+
+abstract_class IEventRegisterCallback
+{
+public:
+	virtual void FireEvent() = 0;
+};
+
+
+class CEventRegister
+{
+friend bool TimedEventMgr_LessFunc( CEventRegister* const &a, CEventRegister* const &b );
+friend class CTimedEventMgr;
+
+public:
+	CEventRegister();
+	~CEventRegister();
+
+	// Call this before ever calling SetUpdateInterval().
+	void Init( CTimedEventMgr *pMgr, IEventRegisterCallback *pCallback );
+	
+	// Use these to start and stop getting updates.
+	void SetUpdateInterval( float interval );
+	void StopUpdates();
+
+	inline bool IsRegistered() const { return m_bRegistered; }
+
+private:
+
+	void Reregister();	// After having an event processed, this is called to have it register for the next one.
+	void Term();
+
+
+private:
+	
+	CTimedEventMgr *m_pEventMgr;
+	float m_flNextEventTime;
+	float m_flUpdateInterval;
+	IEventRegisterCallback *m_pCallback;
+	bool m_bRegistered;
+};
+
+
+class CTimedEventMgr
+{
+friend class CEventRegister;
+
+public:
+	CTimedEventMgr();
+
+	// Call this each frame to fire events.
+	void FireEvents();
+
+
+private:
+
+	// Things used by CEventRegister.
+	void RegisterForNextEvent( CEventRegister *pEvent );
+	void RemoveEvent( CEventRegister *pEvent );	
+	
+private:	
+	
+	// Events, sorted by the time at which they will fire.
+	CUtlPriorityQueue<CEventRegister*> m_Events;
+};
+
+
+#endif // TIMEDEVENTMGR_H