subsystem.h

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// Subsystem.h
//
// $Id: //poco/Main/Util/include/Util/Subsystem.h#1 $
//
// Definition of the Subsystem class.
//
// Copyright (c) 2004-2005, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Util_Subsystem_INCLUDED
#define Util_Subsystem_INCLUDED


#ifndef Util_Util_INCLUDED
#include "Util/Util.h"
#endif
#ifndef Foundation_RefCountedObject_INCLUDED
#include "Foundation/RefCountedObject.h"
#endif


Util_BEGIN


class Application;


class Util_API Subsystem: public Foundation::RefCountedObject
	/// Subsystems extend an application in a modular way.
	///
	/// The Subsystem class provides a common interface
	/// for subsystems so that subsystems can be automatically
	/// initialized at startup and uninitialized at shutdown.
	///
	/// Subsystems should also support dynamic reconfiguration,
	/// so that they can be reconfigured anytime during the
	/// life of a running application.
	///
	/// The degree to which dynamic reconfiguration is supported
	/// is up to the actual subsystem implementation. It can 
	/// range from ignoring the reconfiguration request (not
	/// recommended), to changing certain settings that affect
	/// the performance, to a complete reinitialization.
{
public:
	Subsystem();
		/// Creates the Subsystem.
		
protected:
	virtual const char* name() const = 0;
		/// Returns the name of the subsystem.
		/// Must be implemented by subclasses.

	virtual void initialize(const Application& app) = 0;
		/// Initializes the subsystem.
		
	virtual void uninitialize() = 0;
		/// Uninitializes the subsystem.

	virtual void reinitialize(const Application& app);
		/// Re-initializes the subsystem.
		///
		/// The default implementation just calls
		/// uninitialize() followed by initialize().
		/// Actual implementations might want to use a
		/// less radical and possibly more performant 
		/// approach.

	virtual ~Subsystem();
		/// Destroys the Subsystem.
		
	friend class Application;
};


Util_END


#endif // Util_Subsystem_INCLUDED