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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qqmlenginecontrolclient_p.h"
#include "qqmlenginecontrolclient_p_p.h"
#include "qqmldebugconnection_p.h"
#include <private/qpacket_p.h>
QT_BEGIN_NAMESPACE
QQmlEngineControlClient::QQmlEngineControlClient(QQmlDebugConnection *connection) :
QQmlDebugClient(*(new QQmlEngineControlClientPrivate(connection)))
{
}
QQmlEngineControlClient::QQmlEngineControlClient(QQmlEngineControlClientPrivate &dd) :
QQmlDebugClient(dd)
{
}
/*!
* Block the starting or stopping of the engine with id \a engineId for now. By calling
* releaseEngine later the block can be lifted again. In the debugged application the engine control
* server waits until a message is received before continuing. So by not sending a message here we
* delay the process. Blocks add up. You have to call releaseEngine() as often as you've called
* blockEngine before. The intention of that is to allow different debug clients to use the same
* engine control and communicate with their respective counterparts before the QML engine starts or
* shuts down.
*/
void QQmlEngineControlClient::blockEngine(int engineId)
{
Q_D(QQmlEngineControlClient);
Q_ASSERT(d->blockedEngines.contains(engineId));
d->blockedEngines[engineId].blockers++;
}
/*!
* Release the engine with id \a engineId. If no other blocks are present, depending on what the
* engine is waiting for, the start or stop command is sent to the process being debugged.
*/
void QQmlEngineControlClient::releaseEngine(int engineId)
{
Q_D(QQmlEngineControlClient);
Q_ASSERT(d->blockedEngines.contains(engineId));
QQmlEngineControlClientPrivate::EngineState &state = d->blockedEngines[engineId];
if (--state.blockers == 0) {
Q_ASSERT(state.releaseCommand != QQmlEngineControlClientPrivate::InvalidCommand);
d->sendCommand(state.releaseCommand, engineId);
d->blockedEngines.remove(engineId);
}
}
QList<int> QQmlEngineControlClient::blockedEngines() const
{
Q_D(const QQmlEngineControlClient);
return d->blockedEngines.keys();
}
void QQmlEngineControlClient::messageReceived(const QByteArray &data)
{
Q_D(QQmlEngineControlClient);
QPacket stream(d->connection->currentDataStreamVersion(), data);
qint32 message;
qint32 id;
QString name;
stream >> message >> id;
if (!stream.atEnd())
stream >> name;
auto handleWaiting = [&](
QQmlEngineControlClientPrivate::CommandType command, std::function<void()> emitter) {
QQmlEngineControlClientPrivate::EngineState &state = d->blockedEngines[id];
Q_ASSERT(state.blockers == 0);
Q_ASSERT(state.releaseCommand == QQmlEngineControlClientPrivate::InvalidCommand);
state.releaseCommand = command;
emitter();
if (state.blockers == 0) {
d->sendCommand(state.releaseCommand, id);
d->blockedEngines.remove(id);
}
};
switch (message) {
case QQmlEngineControlClientPrivate::EngineAboutToBeAdded:
handleWaiting(QQmlEngineControlClientPrivate::StartWaitingEngine, [&](){
emit engineAboutToBeAdded(id, name);
});
break;
case QQmlEngineControlClientPrivate::EngineAdded:
emit engineAdded(id, name);
break;
case QQmlEngineControlClientPrivate::EngineAboutToBeRemoved:
handleWaiting(QQmlEngineControlClientPrivate::StopWaitingEngine, [&](){
emit engineAboutToBeRemoved(id, name);
});
break;
case QQmlEngineControlClientPrivate::EngineRemoved:
emit engineRemoved(id, name);
break;
}
}
QQmlEngineControlClientPrivate::QQmlEngineControlClientPrivate(QQmlDebugConnection *connection) :
QQmlDebugClientPrivate(QLatin1String("EngineControl"), connection)
{
}
void QQmlEngineControlClientPrivate::sendCommand(
QQmlEngineControlClientPrivate::CommandType command, int engineId)
{
Q_Q(QQmlEngineControlClient);
QPacket stream(connection->currentDataStreamVersion());
stream << static_cast<qint32>(command) << engineId;
q->sendMessage(stream.data());
}
QT_END_NAMESPACE
#include "moc_qqmlenginecontrolclient_p.cpp"
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