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/**
******************************************************************************
*
* @file multitask.h
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
* Parts by Nokia Corporation (qt-info@nokia.com) Copyright (C) 2009.
* @brief
* @see The GNU Public License (GPL) Version 3
* @defgroup
* @{
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MULTITASK_H
#define MULTITASK_H
#include "qtconcurrent_global.h"
#include "runextensions.h"
#include <QtCore/QObject>
#include <QtCore/QList>
#include <QtCore/QEventLoop>
#include <QtCore/QFutureWatcher>
#include <QtCore/QtConcurrentRun>
#include <QtCore/QThreadPool>
#include <QtDebug>
QT_BEGIN_NAMESPACE
namespace QtConcurrent {
class QTCONCURRENT_EXPORT MultiTaskBase : public QObject, public QRunnable
{
Q_OBJECT
protected slots:
virtual void cancelSelf() = 0;
virtual void setFinished() = 0;
virtual void setProgressRange(int min, int max) = 0;
virtual void setProgressValue(int value) = 0;
virtual void setProgressText(QString value) = 0;
};
template <typename Class, typename R>
class MultiTask : public MultiTaskBase
{
public:
MultiTask(void (Class::*fn)(QFutureInterface<R> &), const QList<Class *> &objects)
: fn(fn),
objects(objects)
{
maxProgress = 100*objects.size();
}
QFuture<R> future()
{
futureInterface.reportStarted();
return futureInterface.future();
}
void run()
{
QThreadPool::globalInstance()->releaseThread();
futureInterface.setProgressRange(0, maxProgress);
foreach (Class *object, objects) {
QFutureWatcher<R> *watcher = new QFutureWatcher<R>();
watchers.insert(object, watcher);
finished.insert(watcher, false);
connect(watcher, SIGNAL(finished()), this, SLOT(setFinished()));
connect(watcher, SIGNAL(progressRangeChanged(int,int)), this, SLOT(setProgressRange(int,int)));
connect(watcher, SIGNAL(progressValueChanged(int)), this, SLOT(setProgressValue(int)));
connect(watcher, SIGNAL(progressTextChanged(QString)), this, SLOT(setProgressText(QString)));
watcher->setFuture(QtConcurrent::run(fn, object));
}
selfWatcher = new QFutureWatcher<R>();
connect(selfWatcher, SIGNAL(canceled()), this, SLOT(cancelSelf()));
selfWatcher->setFuture(futureInterface.future());
loop = new QEventLoop;
loop->exec();
futureInterface.reportFinished();
QThreadPool::globalInstance()->reserveThread();
qDeleteAll(watchers.values());
delete selfWatcher;
delete loop;
}
protected:
void cancelSelf()
{
foreach (QFutureWatcher<R> *watcher, watchers)
watcher->future().cancel();
}
void setFinished()
{
updateProgress();
QFutureWatcher<R> *watcher = static_cast<QFutureWatcher<R> *>(sender());
if (finished.contains(watcher))
finished[watcher] = true;
bool allFinished = true;
const QList<bool> finishedValues = finished.values();
foreach (bool isFinished, finishedValues) {
if (!isFinished) {
allFinished = false;
break;
}
}
if (allFinished)
loop->quit();
}
void setProgressRange(int min, int max)
{
Q_UNUSED(min)
Q_UNUSED(max)
updateProgress();
}
void setProgressValue(int value)
{
Q_UNUSED(value)
updateProgress();
}
void setProgressText(QString value)
{
Q_UNUSED(value)
updateProgressText();
}
private:
void updateProgress()
{
int progressSum = 0;
const QList<QFutureWatcher<R> *> watchersValues = watchers.values();
foreach (QFutureWatcher<R> *watcher, watchersValues) {
if (watcher->progressMinimum() == watcher->progressMaximum()) {
if (watcher->future().isFinished() && !watcher->future().isCanceled())
progressSum += 100;
} else {
progressSum += 100*(watcher->progressValue()-watcher->progressMinimum())/(watcher->progressMaximum()-watcher->progressMinimum());
}
}
futureInterface.setProgressValue(progressSum);
}
void updateProgressText()
{
QString text;
const QList<QFutureWatcher<R> *> watchersValues = watchers.values();
foreach (QFutureWatcher<R> *watcher, watchersValues) {
if (!watcher->progressText().isEmpty())
text += watcher->progressText() + "\n";
}
text = text.trimmed();
futureInterface.setProgressValueAndText(futureInterface.progressValue(), text);
}
QFutureInterface<R> futureInterface;
void (Class::*fn)(QFutureInterface<R> &);
QList<Class *> objects;
QFutureWatcher<R> *selfWatcher;
QMap<Class *, QFutureWatcher<R> *> watchers;
QMap<QFutureWatcher<R> *, bool> finished;
QEventLoop *loop;
int maxProgress;
};
template <typename Class, typename T>
QFuture<T> run(void (Class::*fn)(QFutureInterface<T> &), const QList<Class *> &objects, int priority = 0)
{
MultiTask<Class, T> *task = new MultiTask<Class, T>(fn, objects);
QFuture<T> future = task->future();
QThreadPool::globalInstance()->start(task, priority);
return future;
}
} // namespace QtConcurrent
QT_END_NAMESPACE
#endif // MULTITASK_H