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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "qmlenginecontrolclient.h"
#include "qpacketprotocol.h"
#include <utils/qtcassert.h>
#include <functional>
namespace QmlDebug {
QmlEngineControlClient::QmlEngineControlClient(QmlDebugConnection *client)
: QmlDebugClient(QLatin1String("EngineControl"), client)
{
}
/*!
* 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 QmlEngineControlClient::blockEngine(int engineId)
{
QTC_ASSERT(m_blockedEngines.contains(engineId), return);
m_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 QmlEngineControlClient::releaseEngine(int engineId)
{
QTC_ASSERT(m_blockedEngines.contains(engineId), return);
EngineState &state = m_blockedEngines[engineId];
if (--state.blockers == 0) {
QTC_ASSERT(state.releaseCommand != InvalidCommand, return);
sendCommand(state.releaseCommand, engineId);
m_blockedEngines.remove(engineId);
}
}
QList<int> QmlEngineControlClient::blockedEngines() const
{
return m_blockedEngines.keys();
}
void QmlEngineControlClient::messageReceived(const QByteArray &data)
{
QPacket stream(dataStreamVersion(), data);
qint32 message;
qint32 id;
QString name;
stream >> message >> id;
if (!stream.atEnd())
stream >> name;
auto handleWaiting = [&](CommandType command, std::function<void()> emitter) {
EngineState &state = m_blockedEngines[id];
QTC_CHECK(state.blockers == 0);
QTC_CHECK(state.releaseCommand == InvalidCommand);
state.releaseCommand = command;
emitter();
if (state.blockers == 0) {
sendCommand(state.releaseCommand, id);
m_blockedEngines.remove(id);
}
};
switch (message) {
case EngineAboutToBeAdded:
handleWaiting(StartWaitingEngine, [this, id, name] {
emit engineAboutToBeAdded(id, name);
});
break;
case EngineAdded:
emit engineAdded(id, name);
break;
case EngineAboutToBeRemoved:
handleWaiting(StopWaitingEngine, [this, id, name] {
emit engineAboutToBeRemoved(id, name);
});
break;
case EngineRemoved:
emit engineRemoved(id, name);
break;
}
}
void QmlEngineControlClient::sendCommand(QmlEngineControlClient::CommandType command, int engineId)
{
QPacket stream(dataStreamVersion());
stream << static_cast<qint32>(command) << engineId;
QmlDebugClient::sendMessage(stream.data());
}
}
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