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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 QLibrary 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"
#if !defined QT_NO_THREAD
#include "QtCore/qthread.h"
# define QHostInfoAgentBase QThread
#else
# define QHostInfoAgentBase QObject
#endif
QT_BEGIN_NAMESPACE
static const int QHOSTINFO_THREAD_WAIT = 250; // ms
class QHostInfoResult : public QObject
{
Q_OBJECT
public Q_SLOTS:
inline void emitResultsReady(const QHostInfo &info)
{
emit resultsReady(info);
if (autoDelete)
delete this;
}
Q_SIGNALS:
void resultsReady(const QHostInfo &info);
public:
int lookupId;
bool autoDelete;
};
struct QHostInfoQuery
{
inline QHostInfoQuery() : object(0) {}
inline ~QHostInfoQuery() { delete object; }
inline QHostInfoQuery(const QString &name, QHostInfoResult *result)
: hostName(name), object(result) {}
QString hostName;
QHostInfoResult *object;
};
class QHostInfoAgent : public QHostInfoAgentBase
{
Q_OBJECT
public:
inline QHostInfoAgent()
{
// There is a chance that there will be two instances of
// QHostInfoAgent if two threads try to get Q_GLOBAL_STATIC
// object at the same time. The second object will be deleted
// immediately before anyone uses it, but we need to be
// careful about what we do in the constructor.
static QBasicAtomicInt done = Q_BASIC_ATOMIC_INITIALIZER(0);
if (done.testAndSetRelaxed(0, 1))
qAddPostRoutine(staticCleanup);
moveToThread(QCoreApplicationPrivate::mainThread());
quit = false;
pendingQueryId = -1;
}
inline ~QHostInfoAgent()
{ cleanup(); }
void run();
static QHostInfo fromName(const QString &hostName);
inline void addHostName(const QString &name, QHostInfoResult *result)
{
QMutexLocker locker(&mutex);
queries << new QHostInfoQuery(name, result);
cond.wakeOne();
}
inline void abortLookup(int id)
{
QMutexLocker locker(&mutex);
for (int i = 0; i < queries.size(); ++i) {
QHostInfoResult *result = queries.at(i)->object;
if (result->lookupId == id) {
result->disconnect();
delete queries.takeAt(i);
return;
}
}
if (pendingQueryId == id)
pendingQueryId = -1;
}
static void staticCleanup();
public Q_SLOTS:
inline void cleanup()
{
{
QMutexLocker locker(&mutex);
qDeleteAll(queries);
queries.clear();
quit = true;
cond.wakeOne();
}
#ifndef QT_NO_THREAD
if (!wait(QHOSTINFO_THREAD_WAIT))
terminate();
wait();
#endif
}
private:
QList<QHostInfoQuery *> queries;
QMutex mutex;
QWaitCondition cond;
volatile bool quit;
int pendingQueryId;
};
class QHostInfoPrivate
{
public:
inline QHostInfoPrivate()
: err(QHostInfo::NoError),
errorStr(QLatin1String(QT_TRANSLATE_NOOP("QHostInfo", "Unknown error")))
{
}
QHostInfo::HostInfoError err;
QString errorStr;
QList<QHostAddress> addrs;
QString hostName;
int lookupId;
};
QT_END_NAMESPACE
#endif // QHOSTINFO_P_H
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