/****************************************************************************

**

** Copyright (C) 2010 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"

#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

// 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 work();

    // called from QHostInfo

    void scheduleLookup(QHostInfoRunnable *r);

    void abortLookup(int id);

    // called from QHostInfoRunnable

    void lookupFinished(QHostInfoRunnable *r);

    bool wasAborted(int id);

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;

};

#endif

QT_END_NAMESPACE

#endif // QHOSTINFO_P_H