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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QHOSTINFO_P_H
#define QHOSTINFO_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 QHostInfo class. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/qcoreapplication.h"
#include "private/qcoreapplication_p.h"
#include "QtNetwork/qhostinfo.h"
#include "QtCore/qmutex.h"
#include "QtCore/qwaitcondition.h"
#include "QtCore/qobject.h"
#include "QtCore/qpointer.h"
#ifndef QT_NO_THREAD
#include "QtCore/qthread.h"
#include "QtCore/qthreadpool.h"
#include "QtCore/qmutex.h"
#include "QtCore/qrunnable.h"
#include "QtCore/qlist.h"
#include "QtCore/qqueue.h"
#include <QElapsedTimer>
#include <QCache>
#endif
QT_BEGIN_NAMESPACE
class QHostInfoResult : public QObject
{
Q_OBJECT
public Q_SLOTS:
inline void emitResultsReady(const QHostInfo &info)
{
emit resultsReady(info);
}
Q_SIGNALS:
void resultsReady(const QHostInfo &info);
};
// needs to be QObject because fromName calls tr()
class QHostInfoAgent : public QObject
{
Q_OBJECT
public:
static QHostInfo fromName(const QString &hostName);
};
class QHostInfoPrivate
{
public:
inline QHostInfoPrivate()
: err(QHostInfo::NoError),
errorStr(QLatin1String(QT_TRANSLATE_NOOP("QHostInfo", "Unknown error"))),
lookupId(0)
{
}
QHostInfo::HostInfoError err;
QString errorStr;
QList<QHostAddress> addrs;
QString hostName;
int lookupId;
};
#ifndef QT_NO_THREAD
// These functions are outside of the QHostInfo class and strictly internal.
// Do NOT use them outside of QAbstractSocket.
QHostInfo Q_NETWORK_EXPORT qt_qhostinfo_lookup(const QString &name, QObject *receiver, const char *member, bool *valid, int *id);
void Q_AUTOTEST_EXPORT qt_qhostinfo_clear_cache();
void Q_AUTOTEST_EXPORT qt_qhostinfo_enable_cache(bool e);
class QHostInfoCache
{
public:
QHostInfoCache();
const int max_age; // seconds
QHostInfo get(const QString &name, bool *valid);
void put(const QString &name, const QHostInfo &info);
void clear();
bool isEnabled();
void setEnabled(bool e);
private:
bool enabled;
struct QHostInfoCacheElement {
QHostInfo info;
QElapsedTimer age;
};
QCache<QString,QHostInfoCacheElement> cache;
QMutex mutex;
};
// the following classes are used for the (normal) case: We use multiple threads to lookup DNS
class QHostInfoRunnable : public QRunnable
{
public:
QHostInfoRunnable (QString hn, int i);
void run();
QString toBeLookedUp;
int id;
QHostInfoResult resultEmitter;
};
class QHostInfoLookupManager : public QObject
{
Q_OBJECT
public:
QHostInfoLookupManager();
~QHostInfoLookupManager();
void clear();
void work();
// called from QHostInfo
void scheduleLookup(QHostInfoRunnable *r);
void abortLookup(int id);
// called from QHostInfoRunnable
void lookupFinished(QHostInfoRunnable *r);
bool wasAborted(int id);
QHostInfoCache cache;
friend class QHostInfoRunnable;
protected:
QList<QHostInfoRunnable*> currentLookups; // in progress
QList<QHostInfoRunnable*> postponedLookups; // postponed because in progress for same host
QQueue<QHostInfoRunnable*> scheduledLookups; // not yet started
QList<QHostInfoRunnable*> finishedLookups; // recently finished
QList<int> abortedLookups; // ids of aborted lookups
QThreadPool threadPool;
QMutex mutex;
bool wasDeleted;
private slots:
void waitForThreadPoolDone() { threadPool.waitForDone(); }
};
#endif
QT_END_NAMESPACE
#endif // QHOSTINFO_P_H
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