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/*
This file is part of libkabc.
Copyright (c) 2001,2003 Cornelius Schumacher <schumacher@kde.org>
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.
*/
#ifndef KABC_LOCK_H
#define KABC_LOCK_H
#include <qstring.h>
#include <qobject.h>
#include <kdelibs_export.h>
namespace KABC {
/**
This class provides locking functionality for a file, directory or an
arbitrary string-represented resource.
*/
class KABC_EXPORT Lock : public QObject
{
Q_OBJECT
public:
/**
Constructor.
@param identifier An identifier for the resource to be locked, e.g. a file
name.
*/
Lock( const QString &identifier );
/**
Destruct lock object. This also removes the lock on the resource.
*/
~Lock();
/**
Lock resource.
*/
virtual bool lock();
/**
Unlock resource.
*/
virtual bool unlock();
virtual QString error() const;
QString lockFileName() const;
static bool readLockFile( const QString &filename, int &pid, QString &app );
static bool writeLockFile( const QString &filename );
static QString locksDir();
signals:
void locked();
void unlocked();
private:
QString mIdentifier;
QString mLockUniqueName;
QString mError;
class Private;
Private *d;
};
}
#endif
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