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

#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