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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtAddOn.JsonStream module of the Qt.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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, 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qpreforkprocessbackendfactory.h"
#include "qprefork.h"
#include "qremoteprotocol.h"
#include <QDebug>
#include <QJsonDocument>
QT_BEGIN_NAMESPACE_PROCESSMANAGER
const int kPreforkTimerInterval = 1000;
/*!
\class QPreforkProcessBackendFactory
\brief The QPreforkProcessBackendFactory class connects to a preforked client
\inmodule QtProcessManager
The QPreforkProcessBackendFactory class can only be used in a process
that has been started by the \l{QPrefork} class. Each
QPreforkProcessBackendFactory object must be associated with a single
child process started from the \l{QPrefork} class. The association is
done by setting the \l{index} property to match a valid index from
the \l{QPrefork} singleton object.
The QPreforkProcessBackendFactory communicates with the child process
using the same protocol as the \l{QPipeProcessBackendFactory} (simple
JSON-formatted messages).
*/
/*!
\property QPreforkProcessBackendFactory::index
Index into the prefork instance of which process this should be
connected to.
*/
/*!
Construct a QPreforkProcessBackendFactory with optional \a parent.
*/
QPreforkProcessBackendFactory::QPreforkProcessBackendFactory(QObject *parent)
: QRemoteProcessBackendFactory(parent)
, m_index(-1)
{
m_pipe = new QtAddOn::QtJsonStream::QJsonPipe(this);
connect(m_pipe, SIGNAL(messageReceived(const QJsonObject&)),
SLOT(receive(const QJsonObject&)));
handleConnected();
}
/*!
Destroy this and child objects.
*/
QPreforkProcessBackendFactory::~QPreforkProcessBackendFactory()
{
if (m_index >= 0) {
const QPreforkChildData *data = QPrefork::instance()->at(m_index);
if (data) {
QJsonObject message;
message.insert(QRemoteProtocol::remote(), QRemoteProtocol::halt());
m_pipe->send(message);
m_pipe->waitForBytesWritten();
}
}
}
/*!
Return the process index
*/
int QPreforkProcessBackendFactory::index() const
{
return m_index;
}
/*!
Set the prefork index to \a index
*/
void QPreforkProcessBackendFactory::setIndex(int index)
{
QPrefork *prefork = QPrefork::instance();
Q_ASSERT(prefork);
if (index >= 0 && index < prefork->size()) {
m_index = index;
const QPreforkChildData *data = prefork->at(index);
m_pipe->setFds(data->out, data->in);
emit indexChanged();
}
else
qWarning() << Q_FUNC_INFO << "index out of range";
}
/*!
Return the local process
*/
QPidList QPreforkProcessBackendFactory::localInternalProcesses() const
{
QPrefork *prefork = QPrefork::instance();
Q_ASSERT(prefork);
QList<Q_PID> list;
if (m_index >= 0 && m_index < prefork->size()) {
const QPreforkChildData *data = prefork->at(m_index);
list << data->pid;
}
return list;
}
/*!
Send a \a message to the preforked process
*/
bool QPreforkProcessBackendFactory::send(const QJsonObject& message)
{
return m_pipe->send(message);
}
/*!
\fn QPreforkProcessBackendFactory::indexChanged()
This signal is emitted when the index is changed.
*/
#include "moc_qpreforkprocessbackendfactory.cpp"
QT_END_NAMESPACE_PROCESSMANAGER
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