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indexingqueue.h
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indexingqueue.h
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/*
* This file is part of the KDE Baloo Project
* Copyright (C) 2012 Vishesh Handa <me@vhanda.in>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef FILEINDEXER_INDEXINGQUEUE_H
#define FILEINDEXER_INDEXINGQUEUE_H
#include <QtCore/QObject>
#include <QtCore/QQueue>
#include <QtCore/QDirIterator>
namespace Baloo
{
/**
* An abstract class representing the queue. All indexing queues
* should be derived from this queue.
*
*/
class IndexingQueue : public QObject
{
Q_OBJECT
public:
explicit IndexingQueue(QObject* parent = 0);
virtual bool isEmpty() = 0;
/**
* fill the queue if there is available data, return true if something
* is enqueued. Should be used in combinition with isEmpty()
*
* Default implementation will do nothing.
*/
virtual void fillQueue();
/**
* Sets a artificial delay between each call to processNextIteration.
* This can be used to slow down the indexing, in order to conserve
* resources.
*/
void setDelay(int msec);
public Q_SLOTS:
void suspend();
void resume();
Q_SIGNALS:
/**
* The derived queues must emit this signal when their queue
* gets filled up
*/
void startedIndexing();
/**
* Will automatically be emitted after an iteration if empty
* returns true
*/
void finishedIndexing();
protected:
/**
* Process the next iteration in your queue. Once you are done
* processing the file call finishIndexingFile so that the queue
* can continue processing and call this function when it is
* ready for the next iteration.
*
* \sa finishIndexingFile
*/
virtual void processNextIteration() = 0;
protected Q_SLOTS:
/**
* Call this function when you have finished processing the
* iteration from processNextIteration.
*
* \sa processNextIteration
*/
void finishIteration();
void callForNextIteration();
private Q_SLOTS:
void processNext();
private:
bool m_suspended;
bool m_sentEvent;
int m_delay;
};
}
#endif // FILEINDEXER_INDEXINGQUEUE_H

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