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/**
* Yudit Unicode Editor Source File
*
* GNU Copyright (C) 1997-2023 Gaspar Sinai <gaspar@yudit.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* dated June 1991. See file COPYYING for details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef SEvent_h
#define SEvent_h
#include "SExcept.h"
#include "SString.h"
#include "SStringVector.h"
/**
* @author: Gaspar Sinai <gaspar@yudit.org>
* @version: 2000-04-23
* This library is not multi-threaded. Therefor we need event handlers.
*/
class SEventSource
{
public:
enum Type {FILE, SOCKET, SERVER, JOB, TIMER, PIPE};
SEventSource (Type t, long systemId);
SEventSource (void);
SEventSource (const SEventSource& s);
virtual ~SEventSource();
SEventSource& operator = (const SEventSource& s);
Type getType ();
long getId ();
void setOK(bool ok);
bool isOK();
bool close();
private:
void *shared;
};
/**
* These are the specific event sources that the implementation of
* the event menager should handle
*/
typedef SEventSource SInputStream;
typedef SEventSource SOutputStream;
typedef SEventSource SServerStream;
class SJob : public SEventSource
{
public:
SJob(long priority);
SJob(void);
virtual ~SJob();
virtual int run ();// Normally it returns 0, on fisnich it returns -1.
// On urgent data it returns 1
};
/**
* The event target can receive all kinds of events from the
* event sources above.
*/
class SEventTarget
{
public:
SEventTarget ();
virtual ~SEventTarget ();
/* Any Event Source */
virtual void error (const SEventSource* s);
/* Output Stream Done*/
virtual bool write (const SEventSource* s);
/* Timer Done */
virtual bool timeout (const SEventSource* s);
/* Job Done */
virtual bool done (const SEventSource* s);
/* Input Stream Read */
virtual bool read (const SEventSource* s, const SString& m);
/* Input Stream Is Readable */
virtual int readable (const SEventSource* s);
/* Server Stream Accept */
virtual bool serve (const SEventSource* s);
};
class STimer : public SEventSource
{
public:
STimer (long timeout);
virtual ~STimer ();
/* This one automatically add it to the event manager */
static STimer* newTimer (long timeout, SEventTarget* t);
};
/**
* If you have an external event handler reimplement this
*/
class SEventHandlerImpl
{
public:
SEventHandlerImpl();
virtual ~SEventHandlerImpl();
/* One source can have only one target! Same target
* can be used for more source */
virtual void addJob (SJob* s, SEventTarget* t);
virtual void addServer (SServerStream* s, SEventTarget* t);
virtual void addTimer (STimer* s, SEventTarget* t);
virtual void addInput (SInputStream* s, SEventTarget* t);
// Send async write back to SEventSource
virtual void addOutput (SOutputStream* s, SEventTarget* t, const SString& m);
virtual void remove (SEventTarget* t);
virtual void remove (SEventSource* s);
virtual void start();
virtual void exit();
virtual bool next();
};
/**
* There can be only one event handler.
* So this is pretty much a static class.
*/
class SEventHandler
{
public:
SEventHandler (void);
~SEventHandler (); // Destroys the implementation.
static bool setImpl (SEventHandlerImpl* impl);
static bool implemented();
static void addJob (SJob* s, SEventTarget* t);
static void addServer (SServerStream* s, SEventTarget* t);
static void addTimer (STimer* s, SEventTarget* t);
static void addInput (SInputStream* s, SEventTarget* t);
static void addOutput (SOutputStream* s, SEventTarget* t, const SString& m);
static void remove (SEventTarget* t);
static void remove (SEventSource* s);
static void start();
static void exit();
static bool next();
private:
static SEventHandlerImpl* delegate;
};
#endif /* SEvent_h */
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