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/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QT3D_QCHANGEARBITER_P_H
#define QT3D_QCHANGEARBITER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QObject>
#include <QFlags>
#include <QReadWriteLock>
#include <QVariant>
#include <QVector>
#include <QPair>
#include <QThreadStorage>
#include <QMutex>
#include <Qt3DCore/qnodeid.h>
#include <Qt3DCore/qscenechange.h>
#include <Qt3DCore/private/qlockableobserverinterface_p.h>
#include <Qt3DCore/private/qt3dcore_global_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3D {
class QNode;
class QObservableInterface;
class QAbstractAspectJobManager;
class QSceneObserverInterface;
class QAbstractPostman;
class QScene;
class QT3DCORE_PRIVATE_EXPORT QAbstractArbiter : public QLockableObserverInterface
{
public:
virtual QAbstractPostman *postman() const = 0;
};
class QT3DCORE_PRIVATE_EXPORT QChangeArbiter Q_DECL_FINAL
: public QObject
, public QAbstractArbiter
{
Q_OBJECT
public:
explicit QChangeArbiter(QObject *parent = 0);
~QChangeArbiter();
void initialize(Qt3D::QAbstractAspectJobManager *jobManager);
void syncChanges();
void registerObserver(QObserverInterface *observer,
const QNodeId &nodeId,
ChangeFlags changeFlags = AllChanges);
void unregisterObserver(QObserverInterface *observer,
const QNodeId &nodeId);
void registerSceneObserver(QSceneObserverInterface *observer);
void unregisterSceneObserver(QSceneObserverInterface *observer);
void sceneChangeEvent(const QSceneChangePtr &e) Q_DECL_OVERRIDE; // QLockableObserverInterface impl
void sceneChangeEventWithLock(const QSceneChangePtr &e) Q_DECL_OVERRIDE; // QLockableObserverInterface impl
void sceneChangeEventWithLock(const QSceneChangeList &e) Q_DECL_OVERRIDE; // QLockableObserverInterface impl
Q_INVOKABLE void setPostman(Qt3D::QAbstractPostman *postman);
Q_INVOKABLE void setScene(Qt3D::QScene *scene);
QAbstractPostman *postman() const Q_DECL_FINAL;
QScene *scene() const;
static void createUnmanagedThreadLocalChangeQueue(void *changeArbiter);
static void destroyUnmanagedThreadLocalChangeQueue(void *changeArbiter);
static void createThreadLocalChangeQueue(void *changeArbiter);
static void destroyThreadLocalChangeQueue(void *changeArbiter);
protected:
typedef std::vector<QSceneChangePtr> QChangeQueue;
typedef QPair<ChangeFlags, QObserverInterface *> QObserverPair;
typedef QVector<QObserverPair> QObserverList;
void distributeQueueChanges(QChangeQueue *queue);
QThreadStorage<QChangeQueue *> *tlsChangeQueue();
void appendChangeQueue(QChangeQueue *queue);
void removeChangeQueue(QChangeQueue *queue);
void appendLockingChangeQueue(QChangeQueue *queue);
void removeLockingChangeQueue(QChangeQueue *queue);
private:
QMutex m_mutex;
QAbstractAspectJobManager *m_jobManager;
// The lists of observers indexed by observable. We maintain two
// distinct hashes:
//
// m_aspectObservations is for observables owned by aspects
// m_nodeObservations is for observables in the main thread's object tree
//
// We keep these distinct because we do not manage the main thread which means
// the mechanisms for working with objects there is different.
QHash<QNodeId, QObserverList> m_nodeObservations;
QList<QSceneObserverInterface *> m_sceneObservers;
// Each thread has a TLS ChangeQueue so we never need to lock whilst
// receiving a QSceneChange.
QThreadStorage<QChangeQueue *> m_tlsChangeQueue;
// We store a list of the ChangeQueue's from each thread. This will only
// be accessed from the aspect thread during the syncChanges() phase.
QList<QChangeQueue *> m_changeQueues;
QList<QChangeQueue *> m_lockingChangeQueues;
QAbstractPostman *m_postman;
QScene *m_scene;
};
} // namespace Qt3D
QT_END_NAMESPACE
#endif // QT3D_QCHANGEARBITER_P_H
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