/*
 *	DNN - Data News Network
 *
 *	by Stephane Chatty and Stephane Sire
 *
 *	Copyright 1993-1996
 *	Centre d'Etudes de la Navigation Aerienne (CENA)
 *
 *	Multiplexer.
 *
 *	$Id$
 *	$CurLog$
 */

#ifndef IvlMultiplexer_H_
#define IvlMultiplexer_H_

#include "ivl/Initializer.h"
#include "ivl/List.h"

enum MPX_RES { isMpxEmpty, isMpxTerminated, isMpxError, isMpxAborted };

typedef void (IvlMpxHook) ();

class IvlBaseMultiplexer {
friend	void	IvlDnnOpen (IvlBaseMultiplexer*);
friend	MPX_RES	IvlLoop ();
friend	void	IvlClose ();

public:
static	bool	ClassInitialized;
static	void	ClassInit ();
static	IvlInitializerFor <IvlBaseMultiplexer>	Initializer;

protected:
static	IvlList*	GlobalHooks;
static	IvlList*	GlobalFinalHooks;
virtual	MPX_RES	Loop () = 0;

public:
		IvlBaseMultiplexer ();
virtual		~IvlBaseMultiplexer ();

	MPX_RES	Run ();
virtual	void	Stop () = 0;

static	void	AddGlobalHook (IvlMpxHook*, bool = false);
static	void	RemoveGlobalHook (IvlMpxHook*, bool = false);
virtual	void	AddHook (IvlMpxHook*, bool = false) = 0;
virtual	void	RemoveHook (IvlMpxHook*, bool = false) = 0;
virtual	void	AddFinalHook (IvlMpxHook*) = 0;
virtual	void	RemoveFinalHook (IvlMpxHook*) = 0;
};

class IvlMultiplexer : public IvlBaseMultiplexer {
protected:
	IvlList	Hooks;
	IvlList	FinalHooks;
	bool	Looping;

	void	ExecHooks (bool = false);
	MPX_RES	Loop ();

public:
		IvlMultiplexer ();
		~IvlMultiplexer ();
	void	Stop ();
	void	AddHook (IvlMpxHook*, bool = false);
	void	RemoveHook (IvlMpxHook*, bool = false);
	void	AddFinalHook (IvlMpxHook*);
	void	RemoveFinalHook (IvlMpxHook*);
};

extern IvlBaseMultiplexer* IvlMpx;
extern void IvlDnnOpen (IvlBaseMultiplexer* = 0);
extern MPX_RES IvlLoop ();
extern void IvlStop ();
extern void IvlClose ();


#endif	/* IvlMultiplexer_H_ */