Implement base classes for application components

PR #17219.

src/app/application.cpp

@@ -194,7 +194,7 @@ Application::~Application()
 }
 
 #ifndef DISABLE_GUI
-QPointer<MainWindow> Application::mainWindow()
+MainWindow *Application::mainWindow()
 {
     return m_window;
 }
@@ -611,7 +611,7 @@ int Application::exec(const QStringList &params)
         TorrentFilesWatcher::initInstance();
 
 #ifndef DISABLE_WEBUI
-        m_webui = new WebUI;
+        m_webui = new WebUI(this);
 #ifdef DISABLE_GUI
         if (m_webui->isErrored())
             return 1;
@@ -658,7 +658,7 @@ int Application::exec(const QStringList &params)
 #endif // DISABLE_WEBUI
 #else
     UIThemeManager::initInstance();
-    m_window = new MainWindow;
+    m_window = new MainWindow(this);
 #endif // DISABLE_GUI
 
     m_running = true;

src/app/application.h

@@ -118,7 +118,7 @@ public:
     void setMemoryWorkingSetLimit(int size) override;
 
 #ifndef DISABLE_GUI
-    QPointer<MainWindow> mainWindow() override;
+    MainWindow *mainWindow() override;
 #endif
 
 private slots:
@@ -167,7 +167,7 @@ private:
     SettingValue<int> m_storeMemoryWorkingSetLimit;
 
 #ifndef DISABLE_GUI
-    QPointer<MainWindow> m_window;
+    MainWindow *m_window = nullptr;
 #endif
 
 #ifndef DISABLE_WEBUI

src/base/CMakeLists.txt

@@ -2,6 +2,7 @@ add_library(qbt_base STATIC
     # headers
     3rdparty/expected.hpp
     algorithm.h
+    applicationcomponent.h
     asyncfilestorage.h
     bittorrent/abstractfilestorage.h
     bittorrent/addtorrentparams.h
@@ -104,6 +105,7 @@ add_library(qbt_base STATIC
     version.h
 
     # sources
+    applicationcomponent.cpp
     asyncfilestorage.cpp
     bittorrent/abstractfilestorage.cpp
     bittorrent/bandwidthscheduler.cpp

src/base/applicationcomponent.cpp

@@ -0,0 +1,39 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2022  Vladimir Golovnev <glassez@yandex.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#include "applicationcomponent.h"
+
+ApplicationComponent::ApplicationComponent(IApplication *app)
+    : m_app {app}
+{
+}
+
+IApplication *ApplicationComponent::app() const
+{
+    return m_app;
+}

src/base/applicationcomponent.h

@@ -0,0 +1,47 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2022  Vladimir Golovnev <glassez@yandex.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#pragma once
+
+#include <QtGlobal>
+
+#include "interfaces/iapplication.h"
+
+class ApplicationComponent
+{
+    Q_DISABLE_COPY_MOVE(ApplicationComponent)
+
+public:
+    explicit ApplicationComponent(IApplication *app);
+    virtual ~ApplicationComponent() = default;
+
+    virtual IApplication *app() const;
+
+private:
+    IApplication *m_app = nullptr;
+};

src/base/base.pri

@@ -1,6 +1,7 @@
 HEADERS += \
     $$PWD/3rdparty/expected.hpp \
     $$PWD/algorithm.h \
+    $$PWD/applicationcomponent.h \
     $$PWD/asyncfilestorage.h \
     $$PWD/bittorrent/abstractfilestorage.h \
     $$PWD/bittorrent/addtorrentparams.h \
@@ -104,6 +105,7 @@ HEADERS += \
     $$PWD/version.h
 
 SOURCES += \
+    $$PWD/applicationcomponent.cpp \
     $$PWD/asyncfilestorage.cpp \
     $$PWD/bittorrent/abstractfilestorage.cpp \
     $$PWD/bittorrent/bandwidthscheduler.cpp \

src/gui/CMakeLists.txt

@@ -49,6 +49,7 @@ add_library(qbt_gui STATIC
     executionlogwidget.h
     fspathedit.h
     fspathedit_p.h
+    guiapplicationcomponent.h
     hidabletabwidget.h
     interfaces/iguiapplication.h
     ipsubnetwhitelistoptionsdialog.h
@@ -131,6 +132,7 @@ add_library(qbt_gui STATIC
     executionlogwidget.cpp
     fspathedit.cpp
     fspathedit_p.cpp
+    guiapplicationcomponent.cpp
     hidabletabwidget.cpp
     ipsubnetwhitelistoptionsdialog.cpp
     lineedit.cpp

src/gui/advancedsettings.cpp

@@ -151,8 +151,9 @@ namespace
     };
 }
 
-AdvancedSettings::AdvancedSettings(QWidget *parent)
+AdvancedSettings::AdvancedSettings(IGUIApplication *app, QWidget *parent)
     : QTableWidget(parent)
+    , GUIApplicationComponent(app)
 {
     // column
     setColumnCount(COL_COUNT);
@@ -178,7 +179,7 @@ void AdvancedSettings::saveAdvancedSettings() const
 
     session->setResumeDataStorageType(m_comboBoxResumeDataStorage.currentData().value<BitTorrent::ResumeDataStorageType>());
     // Physical memory (RAM) usage limit
-    dynamic_cast<IApplication *>(QCoreApplication::instance())->setMemoryWorkingSetLimit(m_spinBoxMemoryWorkingSetLimit.value());
+    app()->setMemoryWorkingSetLimit(m_spinBoxMemoryWorkingSetLimit.value());
 #if defined(Q_OS_WIN)
     session->setOSMemoryPriority(m_comboBoxOSMemoryPriority.currentData().value<BitTorrent::OSMemoryPriority>());
 #endif
@@ -266,7 +267,7 @@ void AdvancedSettings::saveAdvancedSettings() const
     // Stop tracker timeout
     session->setStopTrackerTimeout(m_spinBoxStopTrackerTimeout.value());
     // Program notification
-    MainWindow *mainWindow = dynamic_cast<IGUIApplication *>(QCoreApplication::instance())->mainWindow();
+    MainWindow *mainWindow = app()->mainWindow();
     mainWindow->setNotificationsEnabled(m_checkBoxProgramNotifications.isChecked());
     mainWindow->setTorrentAddedNotificationsEnabled(m_checkBoxTorrentAddedNotifications.isChecked());
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)) && defined(QT_DBUS_LIB)
@@ -411,7 +412,7 @@ void AdvancedSettings::loadAdvancedSettings()
     m_spinBoxMemoryWorkingSetLimit.setMaximum(std::numeric_limits<int>::max());
     m_spinBoxMemoryWorkingSetLimit.setSuffix(tr(" MiB"));
     m_spinBoxMemoryWorkingSetLimit.setToolTip(tr("This option is less effective on Linux"));
-    m_spinBoxMemoryWorkingSetLimit.setValue(dynamic_cast<IApplication *>(QCoreApplication::instance())->memoryWorkingSetLimit());
+    m_spinBoxMemoryWorkingSetLimit.setValue(app()->memoryWorkingSetLimit());
     addRow(MEMORY_WORKING_SET_LIMIT, (tr("Physical memory (RAM) usage limit") + u' ' + makeLink(u"https://wikipedia.org/wiki/Working_set", u"(?)"))
         , &m_spinBoxMemoryWorkingSetLimit);
 #if defined(Q_OS_WIN)
@@ -670,7 +671,7 @@ void AdvancedSettings::loadAdvancedSettings()
            , &m_spinBoxStopTrackerTimeout);
 
     // Program notifications
-    const MainWindow *mainWindow = dynamic_cast<IGUIApplication *>(QCoreApplication::instance())->mainWindow();
+    const MainWindow *mainWindow = app()->mainWindow();
     m_checkBoxProgramNotifications.setChecked(mainWindow->isNotificationsEnabled());
     addRow(PROGRAM_NOTIFICATIONS, tr("Display notifications"), &m_checkBoxProgramNotifications);
     // Torrent added notifications

src/gui/advancedsettings.h

@@ -34,13 +34,15 @@
 #include <QSpinBox>
 #include <QTableWidget>
 
-class AdvancedSettings final : public QTableWidget
+#include "guiapplicationcomponent.h"
+
+class AdvancedSettings final : public QTableWidget, public GUIApplicationComponent
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(AdvancedSettings)
 
 public:
-    AdvancedSettings(QWidget *parent);
+    explicit AdvancedSettings(IGUIApplication *app, QWidget *parent = nullptr);
 
 public slots:
     void saveAdvancedSettings() const;

src/gui/gui.pri

@@ -16,6 +16,7 @@ HEADERS += \
     $$PWD/executionlogwidget.h \
     $$PWD/fspathedit.h \
     $$PWD/fspathedit_p.h \
+    $$PWD/guiapplicationcomponent.h \
     $$PWD/hidabletabwidget.h \
     $$PWD/interfaces/iguiapplication.h \
     $$PWD/ipsubnetwhitelistoptionsdialog.h \
@@ -98,6 +99,7 @@ SOURCES += \
     $$PWD/executionlogwidget.cpp \
     $$PWD/fspathedit.cpp \
     $$PWD/fspathedit_p.cpp \
+    $$PWD/guiapplicationcomponent.cpp \
     $$PWD/hidabletabwidget.cpp \
     $$PWD/ipsubnetwhitelistoptionsdialog.cpp \
     $$PWD/lineedit.cpp \

src/gui/guiapplicationcomponent.cpp

@@ -0,0 +1,39 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2022  Vladimir Golovnev <glassez@yandex.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#include "guiapplicationcomponent.h"
+
+GUIApplicationComponent::GUIApplicationComponent(IGUIApplication *app)
+    : ApplicationComponent(app)
+{
+}
+
+IGUIApplication *GUIApplicationComponent::app() const
+{
+    return static_cast<IGUIApplication *>(ApplicationComponent::app());
+}

src/gui/guiapplicationcomponent.h

@@ -0,0 +1,42 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2022  Vladimir Golovnev <glassez@yandex.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#pragma once
+
+#include "base/applicationcomponent.h"
+#include "interfaces/iguiapplication.h"
+
+class GUIApplicationComponent : public ApplicationComponent
+{
+    Q_DISABLE_COPY_MOVE(GUIApplicationComponent)
+
+public:
+    explicit GUIApplicationComponent(IGUIApplication *app);
+
+    IGUIApplication *app() const override;
+};

src/gui/interfaces/iguiapplication.h

@@ -39,5 +39,5 @@ class IGUIApplication : public IApplication
 public:
     virtual ~IGUIApplication() = default;
 
-    virtual QPointer<MainWindow> mainWindow() = 0;
+    virtual MainWindow *mainWindow() = 0;
 };

src/gui/mainwindow.cpp

@@ -138,8 +138,9 @@ namespace
 #endif
 }
 
-MainWindow::MainWindow(QWidget *parent)
+MainWindow::MainWindow(IGUIApplication *app, QWidget *parent)
     : QMainWindow(parent)
+    , GUIApplicationComponent(app)
     , m_ui(new Ui::MainWindow)
     , m_storeExecutionLogEnabled(EXECUTIONLOG_SETTINGS_KEY(u"Enabled"_qs))
     , m_storeDownloadTrackerFavicon(SETTINGS_KEY(u"DownloadTrackerFavicon"_qs))
@@ -1833,7 +1834,7 @@ void MainWindow::on_actionOptions_triggered()
     }
     else
     {
-        m_options = new OptionsDialog(this);
+        m_options = new OptionsDialog(app(), this);
         m_options->setAttribute(Qt::WA_DeleteOnClose);
         m_options->open();
     }

src/gui/mainwindow.h

@@ -38,6 +38,7 @@
 #include "base/bittorrent/torrent.h"
 #include "base/logger.h"
 #include "base/settingvalue.h"
+#include "guiapplicationcomponent.h"
 
 class QCloseEvent;
 class QFileSystemWatcher;
@@ -71,13 +72,13 @@ namespace Ui
     class MainWindow;
 }
 
-class MainWindow final : public QMainWindow
+class MainWindow final : public QMainWindow, public GUIApplicationComponent
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(MainWindow)
 
 public:
-    explicit MainWindow(QWidget *parent = nullptr);
+    explicit MainWindow(IGUIApplication *app, QWidget *parent = nullptr);
     ~MainWindow() override;
 
     QWidget *currentTabWidget() const;

src/gui/optionsdialog.cpp

@@ -175,8 +175,9 @@ private:
 };
 
 // Constructor
-OptionsDialog::OptionsDialog(QWidget *parent)
+OptionsDialog::OptionsDialog(IGUIApplication *app, QWidget *parent)
-    : QDialog {parent}
+    : QDialog(parent)
+    , GUIApplicationComponent(app)
     , m_ui {new Ui::OptionsDialog}
     , m_storeDialogSize {SETTINGS_KEY(u"Size"_qs)}
     , m_storeHSplitterSize {SETTINGS_KEY(u"HorizontalSplitterSizes"_qs)}
@@ -542,7 +543,7 @@ OptionsDialog::OptionsDialog(QWidget *parent)
     // Tab selection mechanism
     connect(m_ui->tabSelection, &QListWidget::currentItemChanged, this, &ThisType::changePage);
     // Load Advanced settings
-    m_advancedSettings = new AdvancedSettings(m_ui->tabAdvancedPage);
+    m_advancedSettings = new AdvancedSettings(app, m_ui->tabAdvancedPage);
     m_ui->advPageLayout->addWidget(m_advancedSettings);
     connect(m_advancedSettings, &AdvancedSettings::settingsChanged, this, &ThisType::enableApplyButton);
 
@@ -723,14 +724,13 @@ void OptionsDialog::saveOptions()
 #endif
     session->setPerformanceWarningEnabled(m_ui->checkBoxPerformanceWarning->isChecked());
 
-    auto *app = dynamic_cast<IApplication *>(QCoreApplication::instance());
+    app()->setFileLoggerPath(m_ui->textFileLogPath->selectedPath());
-    app->setFileLoggerPath(m_ui->textFileLogPath->selectedPath());
+    app()->setFileLoggerBackup(m_ui->checkFileLogBackup->isChecked());
-    app->setFileLoggerBackup(m_ui->checkFileLogBackup->isChecked());
+    app()->setFileLoggerMaxSize(m_ui->spinFileLogSize->value() * 1024);
-    app->setFileLoggerMaxSize(m_ui->spinFileLogSize->value() * 1024);
+    app()->setFileLoggerAge(m_ui->spinFileLogAge->value());
-    app->setFileLoggerAge(m_ui->spinFileLogAge->value());
+    app()->setFileLoggerAgeType(m_ui->comboFileLogAgeType->currentIndex());
-    app->setFileLoggerAgeType(m_ui->comboFileLogAgeType->currentIndex());
+    app()->setFileLoggerDeleteOld(m_ui->checkFileLogDelete->isChecked());
-    app->setFileLoggerDeleteOld(m_ui->checkFileLogDelete->isChecked());
+    app()->setFileLoggerEnabled(m_ui->checkFileLog->isChecked());
-    app->setFileLoggerEnabled(m_ui->checkFileLog->isChecked());
     // End Behavior preferences
 
     RSS::Session::instance()->setRefreshInterval(m_ui->spinRSSRefreshInterval->value());
@@ -975,19 +975,18 @@ void OptionsDialog::loadOptions()
 #endif
     m_ui->checkBoxPerformanceWarning->setChecked(session->isPerformanceWarningEnabled());
 
-    const auto *app = dynamic_cast<IApplication *>(QCoreApplication::instance());
+    m_ui->checkFileLog->setChecked(app()->isFileLoggerEnabled());
-    m_ui->checkFileLog->setChecked(app->isFileLoggerEnabled());
+    m_ui->textFileLogPath->setSelectedPath(app()->fileLoggerPath());
-    m_ui->textFileLogPath->setSelectedPath(app->fileLoggerPath());
+    const bool fileLogBackup = app()->isFileLoggerBackup();
-    const bool fileLogBackup = app->isFileLoggerBackup();
     m_ui->checkFileLogBackup->setChecked(fileLogBackup);
     m_ui->spinFileLogSize->setEnabled(fileLogBackup);
-    const bool fileLogDelete = app->isFileLoggerDeleteOld();
+    const bool fileLogDelete = app()->isFileLoggerDeleteOld();
     m_ui->checkFileLogDelete->setChecked(fileLogDelete);
     m_ui->spinFileLogAge->setEnabled(fileLogDelete);
     m_ui->comboFileLogAgeType->setEnabled(fileLogDelete);
-    m_ui->spinFileLogSize->setValue(app->fileLoggerMaxSize() / 1024);
+    m_ui->spinFileLogSize->setValue(app()->fileLoggerMaxSize() / 1024);
-    m_ui->spinFileLogAge->setValue(app->fileLoggerAge());
+    m_ui->spinFileLogAge->setValue(app()->fileLoggerAge());
-    m_ui->comboFileLogAgeType->setCurrentIndex(app->fileLoggerAgeType());
+    m_ui->comboFileLogAgeType->setCurrentIndex(app()->fileLoggerAgeType());
     // End Behavior preferences
 
     m_ui->checkRSSEnable->setChecked(RSS::Session::instance()->isProcessingEnabled());

src/gui/optionsdialog.h

@@ -32,6 +32,7 @@
 
 #include "base/pathfwd.h"
 #include "base/settingvalue.h"
+#include "guiapplicationcomponent.h"
 
 class QListWidgetItem;
 
@@ -57,7 +58,7 @@ namespace Ui
     class OptionsDialog;
 }
 
-class OptionsDialog final : public QDialog
+class OptionsDialog final : public QDialog, public GUIApplicationComponent
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(OptionsDialog)
@@ -83,8 +84,7 @@ class OptionsDialog final : public QDialog
     };
 
 public:
-    // Constructor / Destructor
+    explicit OptionsDialog(IGUIApplication *app, QWidget *parent = nullptr);
-    OptionsDialog(QWidget *parent = nullptr);
     ~OptionsDialog() override;
 
 public slots:

src/webui/api/apicontroller.cpp

@@ -37,8 +37,9 @@
 
 #include "apierror.h"
 
-APIController::APIController(QObject *parent)
+APIController::APIController(IApplication *app, QObject *parent)
-    : QObject {parent}
+    : QObject(parent)
+    , ApplicationComponent(app)
 {
 }
 

src/webui/api/apicontroller.h

@@ -32,18 +32,20 @@
 #include <QObject>
 #include <QVariant>
 
+#include "base/applicationcomponent.h"
+
 class QString;
 
 using DataMap = QHash<QString, QByteArray>;
 using StringMap = QHash<QString, QString>;
 
-class APIController : public QObject
+class APIController : public QObject, public ApplicationComponent
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(APIController)
 
 public:
-    explicit APIController(QObject *parent = nullptr);
+    explicit APIController(IApplication *app, QObject *parent = nullptr);
 
     QVariant run(const QString &action, const StringMap &params, const DataMap &data = {});
 

src/webui/api/appcontroller.cpp

@@ -294,7 +294,7 @@ void AppController::preferencesAction()
     // Advanced settings
     // qBitorrent preferences
     // Physical memory (RAM) usage limit
-    data[u"memory_working_set_limit"_qs] = dynamic_cast<IApplication *>(QCoreApplication::instance())->memoryWorkingSetLimit();
+    data[u"memory_working_set_limit"_qs] = app()->memoryWorkingSetLimit();
     // Current network interface
     data[u"current_network_interface"_qs] = session->networkInterface();
     // Current network interface address
@@ -758,7 +758,7 @@ void AppController::setPreferencesAction()
     // qBittorrent preferences
     // Physical memory (RAM) usage limit
     if (hasKey(u"memory_working_set_limit"_qs))
-        dynamic_cast<IApplication *>(QCoreApplication::instance())->setMemoryWorkingSetLimit(it.value().toInt());
+        app()->setMemoryWorkingSetLimit(it.value().toInt());
     // Current network interface
     if (hasKey(u"current_network_interface"_qs))
     {

src/webui/api/authcontroller.cpp

@@ -37,8 +37,8 @@
 #include "apierror.h"
 #include "isessionmanager.h"
 
-AuthController::AuthController(ISessionManager *sessionManager, QObject *parent)
+AuthController::AuthController(ISessionManager *sessionManager, IApplication *app, QObject *parent)
-    : APIController {parent}
+    : APIController(app, parent)
     , m_sessionManager {sessionManager}
 {
 }

src/webui/api/authcontroller.h

@@ -43,7 +43,7 @@ class AuthController : public APIController
     Q_DISABLE_COPY_MOVE(AuthController)
 
 public:
-    explicit AuthController(ISessionManager *sessionManager, QObject *parent = nullptr);
+    explicit AuthController(ISessionManager *sessionManager, IApplication *app, QObject *parent = nullptr);
 
 private slots:
     void loginAction();

src/webui/api/synccontroller.cpp

@@ -366,8 +366,8 @@ namespace
     }
 }
 
-SyncController::SyncController(QObject *parent)
+SyncController::SyncController(IApplication *app, QObject *parent)
-    : APIController(parent)
+    : APIController(app, parent)
 {
     m_freeDiskSpaceThread = new QThread(this);
     m_freeDiskSpaceChecker = new FreeDiskSpaceChecker();

src/webui/api/synccontroller.h

@@ -45,7 +45,7 @@ class SyncController : public APIController
 public:
     using APIController::APIController;
 
-    explicit SyncController(QObject *parent = nullptr);
+    explicit SyncController(IApplication *app, QObject *parent = nullptr);
     ~SyncController() override;
 
 private slots:

src/webui/webapplication.cpp

@@ -116,10 +116,11 @@ namespace
     }
 }
 
-WebApplication::WebApplication(QObject *parent)
+WebApplication::WebApplication(IApplication *app, QObject *parent)
     : QObject(parent)
+    , ApplicationComponent(app)
     , m_cacheID {QString::number(Utils::Random::rand(), 36)}
-    , m_authController {new AuthController(this, this)}
+    , m_authController {new AuthController(this, app, this)}
 {
     declarePublicAPI(u"auth/login"_qs);
 
@@ -600,7 +601,7 @@ void WebApplication::sessionStart()
         return false;
     });
 
-    m_currentSession = new WebSession(generateSid());
+    m_currentSession = new WebSession(generateSid(), app());
     m_currentSession->registerAPIController<AppController>(u"app"_qs);
     m_currentSession->registerAPIController<LogController>(u"log"_qs);
     m_currentSession->registerAPIController<RSSController>(u"rss"_qs);
@@ -753,8 +754,9 @@ QHostAddress WebApplication::resolveClientAddress() const
 
 // WebSession
 
-WebSession::WebSession(const QString &sid)
+WebSession::WebSession(const QString &sid, IApplication *app)
-    : m_sid {sid}
+    : ApplicationComponent(app)
+    , m_sid {sid}
 {
     updateTimestamp();
 }

src/webui/webapplication.h

@@ -39,6 +39,7 @@
 #include <QSet>
 #include <QTranslator>
 
+#include "base/applicationcomponent.h"
 #include "base/global.h"
 #include "base/http/irequesthandler.h"
 #include "base/http/responsebuilder.h"
@@ -54,10 +55,10 @@ class APIController;
 class AuthController;
 class WebApplication;
 
-class WebSession final : public QObject, public ISession
+class WebSession final : public QObject, public ApplicationComponent, public ISession
 {
 public:
-    explicit WebSession(const QString &sid);
+    explicit WebSession(const QString &sid, IApplication *app);
 
     QString id() const override;
 
@@ -68,7 +69,7 @@ public:
     void registerAPIController(const QString &scope)
     {
         static_assert(std::is_base_of_v<APIController, T>, "Class should be derived from APIController.");
-        m_apiControllers[scope] = new T(this);
+        m_apiControllers[scope] = new T(app(), this);
     }
 
     APIController *getAPIController(const QString &scope) const;
@@ -80,14 +81,15 @@ private:
 };
 
 class WebApplication final
-        : public QObject, public Http::IRequestHandler, public ISessionManager
+        : public QObject, public ApplicationComponent
+        , public Http::IRequestHandler, public ISessionManager
         , private Http::ResponseBuilder
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(WebApplication)
 
 public:
-    explicit WebApplication(QObject *parent = nullptr);
+    explicit WebApplication(IApplication *app, QObject *parent = nullptr);
     ~WebApplication() override;
 
     Http::Response processRequest(const Http::Request &request, const Http::Environment &env) override;

src/webui/webui.cpp

@@ -39,9 +39,8 @@
 #include "base/utils/net.h"
 #include "webapplication.h"
 
-WebUI::WebUI()
+WebUI::WebUI(IApplication *app)
-    : m_isErrored(false)
+    : ApplicationComponent(app)
-    , m_port(0)
 {
     configure();
     connect(Preferences::instance(), &Preferences::changed, this, &WebUI::configure);
@@ -77,7 +76,7 @@ void WebUI::configure()
         const QString serverAddressString = pref->getWebUiAddress();
         if (!m_httpServer)
         {
-            m_webapp = new WebApplication(this);
+            m_webapp = new WebApplication(app(), this);
             m_httpServer = new Http::Server(m_webapp, this);
         }
         else

src/webui/webui.h

@@ -31,6 +31,8 @@
 #include <QObject>
 #include <QPointer>
 
+#include "base/applicationcomponent.h"
+
 namespace Http
 {
     class Server;
@@ -43,13 +45,13 @@ namespace Net
 
 class WebApplication;
 
-class WebUI : public QObject
+class WebUI : public QObject, public ApplicationComponent
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(WebUI)
 
 public:
-    WebUI();
+    explicit WebUI(IApplication *app);
 
     bool isErrored() const;
 
@@ -60,9 +62,9 @@ private slots:
     void configure();
 
 private:
-    bool m_isErrored;
+    bool m_isErrored = false;
     QPointer<Http::Server> m_httpServer;
     QPointer<Net::DNSUpdater> m_dnsUpdater;
     QPointer<WebApplication> m_webapp;
-    quint16 m_port;
+    quint16 m_port = 0;
 };