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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QNETWORKACCESSCACHE_P_H
#define QNETWORKACCESSCACHE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of the Network Access API. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/qobject.h"
#include "QtCore/qbasictimer.h"
#include "QtCore/qbytearray.h"
#include "QtCore/qhash.h"
#include "QtCore/qmetatype.h"
QT_BEGIN_NAMESPACE
class QNetworkRequest;
class QUrl;
// this class is not about caching files but about
// caching objects used by QNetworkAccessManager, e.g. existing TCP connections
// or credentials.
class QNetworkAccessCache: public QObject
{
Q_OBJECT
public:
struct Node;
typedef QHash<QByteArray, Node> NodeHash;
class CacheableObject
{
friend class QNetworkAccessCache;
QByteArray key;
bool expires;
bool shareable;
public:
CacheableObject();
virtual ~CacheableObject();
virtual void dispose() = 0;
inline QByteArray cacheKey() const { return key; }
protected:
void setExpires(bool enable);
void setShareable(bool enable);
};
QNetworkAccessCache();
~QNetworkAccessCache();
void clear();
void addEntry(const QByteArray &key, CacheableObject *entry);
bool hasEntry(const QByteArray &key) const;
bool requestEntry(const QByteArray &key, QObject *target, const char *member);
CacheableObject *requestEntryNow(const QByteArray &key);
void releaseEntry(const QByteArray &key);
void removeEntry(const QByteArray &key);
signals:
void entryReady(QNetworkAccessCache::CacheableObject *);
protected:
void timerEvent(QTimerEvent *);
private:
// idea copied from qcache.h
NodeHash hash;
Node *oldest;
Node *newest;
QBasicTimer timer;
void linkEntry(const QByteArray &key);
bool unlinkEntry(const QByteArray &key);
void updateTimer();
bool emitEntryReady(Node *node, QObject *target, const char *member);
};
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QNetworkAccessCache::CacheableObject*)
#endif
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