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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** $QT_BEGIN_LICENSE:LGPL$
** 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, 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "remoteprocessbackendfactory.h"
#include "remoteprocessbackend.h"
#include "remoteprotocol.h"
QT_BEGIN_NAMESPACE_PROCESSMANAGER
const int kRemoteTimerInterval = 1000;
/*!
\class RemoteProcessBackendFactory
\brief The RemoteProcessBackendFactory class creates RemoteProcessBackend objects
The RemoteProcessBackendFactory communicates with a remote process to control
other, child processes.
The factory communicates with the remote process by sending and receiving
JSON-formated messages. The remote process should respond to the following
commands:
\table
\header
\li Command
\li Action
\row
\li \c{{ "command": "start", "id": NUM, "info": PROCESSINFO }}
\li Start a new process running. The \b{token} attribute will
be used to refer to this process in the future.
\row
\li \c{{ "command": "stop", "id": NUM, "timeout": NUM }}
\li Stop the remote process with an optional timeout.
The remote process should be sent a SIGTERM, followed by
a SIGKILL after 'timeout' milliseconds
\row
\li \c{{ "command": "set", "id": NUM, "key": STRING, "value": NUM }}
\li Set a process key/value pair. Currently the \b{key} can be
either "priority" or "oomAdjustment".
\row
\li \c{{ "command": "write", "id": NUM, "data": STRING }}
\li Write a data string to the remote process. We assume that the
data string is a valid local 8 bit string.
\row
\li \c{{ "command": "memory", "restricted": bool }}
\li Let the remote process know if memory use is restricted.
\endtable
The following are events that are sent by the remote process
to the RemoteProcessBackendFactory:
\table
\header
\li Event
\li Description
\row
\li \c{{ "event": "started", "id": NUM, "pid": NUM }}
\li This process has started. This maps to the QProcess::started()
signal, but also includes the PID of the new process. This should
be the first event returned after a \b{start} command
\row
\li \c{{ "event": "finished", "id": NUM, "exitCode": NUM, "exitStatus": NUM }}
\li The process has exited. This is the last event returned for a given
process number.
\row
\li \c{{ "event": "error", "id": NUM, "error": NUM }}
\li The process has an error that maps to QProcess::ProcessError
\row
\li \c{{ "event": "stateChanged", "id": NUM, "state": NUM }}
\li The process has an event that maps to a QProcess::ProcessState change.
\row
\li \c{{ "event": "output", "id": NUM, "stdout": STRING, "stderr": STRING }}
\li The process has written data to stdout and/or stderr.
\endtable
*/
/*!
Construct a RemoteProcessBackendFactory with optional \a parent.
*/
RemoteProcessBackendFactory::RemoteProcessBackendFactory(QObject *parent)
: ProcessBackendFactory(parent)
, m_idCount(100)
{
}
/*!
Destroy this and child objects.
*/
RemoteProcessBackendFactory::~RemoteProcessBackendFactory()
{
foreach (RemoteProcessBackend *backend, m_backendMap)
backend->factoryDestroyed();
}
/*!
Construct a RemoteProcessBackend from a ProcessInfo \a info record with \a parent.
*/
ProcessBackend * RemoteProcessBackendFactory::create(const ProcessInfo& info, QObject *parent)
{
int id = m_idCount++;
RemoteProcessBackend *backend = new RemoteProcessBackend(info, this, id, parent);
m_backendMap.insert(id, backend);
return backend;
}
/*!
Idle CPU is available. Send the message over the wire
*/
void RemoteProcessBackendFactory::idleCpuAvailable()
{
QJsonObject object;
object.insert(RemoteProtocol::remote(), RemoteProtocol::idlecpuavailable());
send(object);
}
/*!
Tell the remote factory that memory is restricted and space should be freed up.
*/
void RemoteProcessBackendFactory::handleMemoryRestrictionChange()
{
QJsonObject object;
object.insert(RemoteProtocol::remote(), RemoteProtocol::memory());
object.insert(RemoteProtocol::restricted(), m_memoryRestricted);
send(object);
}
/*!
Return a list of local internal processes. This is separate from the
remote internal process list, which comes from the remote host.
You should override this function is a subclass if your subclass is
holding a process object
*/
PidList RemoteProcessBackendFactory::localInternalProcesses() const
{
return PidList();
}
/*!
Handle first connection to the remote process.
This function should be called by subclasses.
*/
void RemoteProcessBackendFactory::handleConnected()
{
handleMemoryRestrictionChange(); // Sends command="memory" message
}
/*!
Receive a remote \a message and dispatch it to the correct recipient.
Call this function from your subclass to properly dispatch messages.
*/
void RemoteProcessBackendFactory::receive(const QJsonObject& message)
{
// qDebug() << Q_FUNC_INFO << message;
QString remote = message.value(RemoteProtocol::remote()).toString();
if (remote == RemoteProtocol::idlecpurequested())
setIdleCpuRequest(message.value(RemoteProtocol::request()).toBool());
else if (remote == RemoteProtocol::internalprocesses()) {
PidList plist = localInternalProcesses() +
arrayToPidList(message.value(RemoteProtocol::processes()).toArray());
qSort(plist);
setInternalProcesses(plist);
}
else if (remote == RemoteProtocol::internalprocesserror()) {
int value = (int) message.value(RemoteProtocol::processError()).toDouble();
emit internalProcessError(static_cast<QProcess::ProcessError>(value));
}
else {
int id = message.value(QLatin1String("id")).toDouble();
if (m_backendMap.contains(id))
m_backendMap.value(id)->receive(message);
}
}
/*!
\fn bool RemoteProcessBackendFactory::send(const QJsonObject& message)
Send a \a message to the remote process. This method must be implemented in a
child process. Return true if the message can be sent.
*/
/*!
\internal
*/
void RemoteProcessBackendFactory::backendDestroyed(int id)
{
if (m_backendMap.remove(id) != 1)
qCritical("Missing remote process backend");
}
#include "moc_remoteprocessbackendfactory.cpp"
QT_END_NAMESPACE_PROCESSMANAGER
|
