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/* -*- C++ -*-
This file implements the state handling in ThreadWeaver.
$ Author: Mirko Boehm $
$ Copyright: (C) 2005-2013 Mirko Boehm $
$ Contact: mirko@kde.org
http://www.kde.org
http://creative-destruction.me $
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
$Id: State.h 32 2005-08-17 08:38:01Z mirko $
*/
#ifndef THREADWEAVER_STATE_H
#define THREADWEAVER_STATE_H
#include <QString>
#include "queueinterface.h"
#include "weaverinterface_p.h"
#include "queuesignals.h"
#include "threadweaver_export.h"
namespace ThreadWeaver
{
class Job;
class Thread;
/** All weaver objects maintain a state of operation which can be
* queried by the application. See the threadweaver documentation on
* how the different states are related.
*/
enum StateId {
/** The object is in the state of construction and has not yet
* started to process jobs. */
InConstruction = 0,
/** Jobs are being processed. */
WorkingHard,
/** Job processing is suspended, but some jobs which where already
* in progress are not finished yet. */
Suspending,
/** Job processing is suspended, and no jobs are being
* processed. */
Suspended,
/** The object is being destructed. Jobs might still be processed,
* the destructor will wait for all threads to exit and then
* end. */
ShuttingDown,
/** The object is being destructed, and all threads have
* exited. No jobs are handled anymore. */
Destructed,
/** Not a state, but a sentinel for the number of defined states. */
NoOfStates
};
/** We use a State pattern to handle the system state in ThreadWeaver. */
class THREADWEAVER_EXPORT State : public QueueInterface, public WeaverInterface
{
public:
/** Default constructor. */
explicit State(QueueSignals *weaver);
/** Destructor. */
virtual ~State();
/** The ID of the current state.
* @see StateNames, StateID
*/
QString stateName() const;
/** The state Id. */
virtual StateId stateId() const = 0;
/** The state has been changed so that this object is responsible for
* state handling. */
virtual void activated();
protected:
/** The Weaver interface this state handles. */
virtual QueueInterface *weaver();
virtual const QueueInterface *weaver() const;
private:
class Private;
Private *const d;
};
}
#endif // THREADWEAVER_STATE_H
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