File indexing completed on 2024-04-28 16:49:43

 /*
  * SPDX-FileCopyrightText: 2014 Daniel Vratil <dvratil@redhat.com>
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  *
  */
 
 #include "backendloader.h"
 #include "abstractbackend.h"
 #include "backenddbuswrapper.h"
 #include "backendloaderadaptor.h"
 #include "backendmanager_p.h"
 #include "kscreen_backendLauncher_debug.h"
 
 #include <QCoreApplication>
 #include <QDBusConnectionInterface>
 #include <QDir>
 #include <QPluginLoader>
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 #include <private/qtx11extras_p.h>
 #else
 #include <QX11Info>
 #endif
 
 #include <memory>
 
 #include <QDBusConnection>
 #include <QDBusInterface>
 
 void pluginDeleter(QPluginLoader *p)
 {
     if (p) {
         qCDebug(KSCREEN_BACKEND_LAUNCHER) << "Unloading" << p->fileName();
         p->unload();
         delete p;
     }
 }
 
 BackendLoader::BackendLoader()
     : QObject()
     , QDBusContext()
     , mLoader(nullptr)
     , mBackend(nullptr)
 {
 }
 
 BackendLoader::~BackendLoader()
 {
     delete mBackend;
     pluginDeleter(mLoader);
     qCDebug(KSCREEN_BACKEND_LAUNCHER) << "Backend loader destroyed";
 }
 
 bool BackendLoader::init()
 {
     QDBusConnection dbus = QDBusConnection::sessionBus();
     new BackendLoaderAdaptor(this);
     if (!dbus.registerObject(QStringLiteral("/"), this, QDBusConnection::ExportAdaptors)) {
         qCWarning(KSCREEN_BACKEND_LAUNCHER) << "Failed to export backend to DBus: another launcher already running?";
         qCWarning(KSCREEN_BACKEND_LAUNCHER) << dbus.lastError().message();
         return false;
     }
 
     return true;
 }
 
 QString BackendLoader::backend() const
 {
     if (mBackend) {
         return mBackend->backend()->name();
     }
 
     return QString();
 }
 
 bool BackendLoader::requestBackend(const QString &backendName, const QVariantMap &arguments)
 {
     if (mBackend) {
         // If an backend is already loaded, but it's not the same as the one
         // requested, then it's an error
         if (!backendName.isEmpty() && mBackend->backend()->name() != backendName) {
             sendErrorReply(QDBusError::Failed, QStringLiteral("Another backend is already active"));
             return false;
         } else {
             // If caller requested the same one as already loaded, or did not
             // request a specific backend, hapilly reuse the existing one
             return true;
         }
     }
 
     KScreen::AbstractBackend *backend = loadBackend(backendName, arguments);
     if (!backend) {
         return false;
     }
 
     mBackend = new BackendDBusWrapper(backend);
     if (!mBackend->init()) {
         delete mBackend;
         mBackend = nullptr;
         pluginDeleter(mLoader);
         mLoader = nullptr;
         return false;
     }
     return true;
 }
 
 KScreen::AbstractBackend *BackendLoader::loadBackend(const QString &name, const QVariantMap &arguments)
 {
     if (mLoader == nullptr) {
         std::unique_ptr<QPluginLoader, void (*)(QPluginLoader *)> loader(new QPluginLoader(), pluginDeleter);
         mLoader = loader.release();
     }
     return KScreen::BackendManager::loadBackendPlugin(mLoader, name, arguments);
 }
 
 void BackendLoader::quit()
 {
     qApp->quit();
 }