diff --git a/apps/app-launch-helper/src/CMakeLists.txt b/apps/app-launch-helper/src/CMakeLists.txt
index e3ab8a4..e324c2e 100644
--- a/apps/app-launch-helper/src/CMakeLists.txt
+++ b/apps/app-launch-helper/src/CMakeLists.txt
@@ -6,5 +6,9 @@ target_link_libraries(${APP_LAUNCH_HELPER_BIN} PRIVATE
     PkgConfig::SYSTEMD
 )
 
+target_include_directories(${APP_LAUNCH_HELPER_BIN} PRIVATE
+    ${PROJECT_SOURCE_DIR}/src
+)
+
 include(GNUInstallDirs)
 install(TARGETS ${APP_LAUNCH_HELPER_BIN} DESTINATION ${CMAKE_INSTALL_LIBEXECDIR}/deepin/application-manager/)
diff --git a/apps/app-launch-helper/src/main.cpp b/apps/app-launch-helper/src/main.cpp
index af532da..740e635 100644
--- a/apps/app-launch-helper/src/main.cpp
+++ b/apps/app-launch-helper/src/main.cpp
@@ -15,6 +15,7 @@
 #include <cstdlib>
 #include <map>
 #include <thread>
+#include "constant.h"
 
 enum class ExitCode { SystemdError = -3, InvalidInput = -2, InternalError = -1, Done = 0, Waiting = 1 };
 
@@ -25,10 +26,6 @@ struct JobRemoveResult
     ExitCode result{ExitCode::Waiting};
 };
 
-constexpr static auto SystemdService = "org.freedesktop.systemd1";
-constexpr static auto SystemdObjectPath = "/org/freedesktop/systemd1";
-constexpr static auto SystemdInterfaceName = "org.freedesktop.systemd1.Manager";
-
 using msg_ptr = sd_bus_message *;
 using bus_ptr = sd_bus *;
 
diff --git a/apps/dde-application-manager/src/main.cpp b/apps/dde-application-manager/src/main.cpp
index a751cf3..ef7a864 100644
--- a/apps/dde-application-manager/src/main.cpp
+++ b/apps/dde-application-manager/src/main.cpp
@@ -21,17 +21,19 @@ int main(int argc, char *argv[])
 {
     QCoreApplication app{argc, argv};
     auto &bus = ApplicationManager1DBus::instance();
-    bus.init(DBusType::Session);
-    auto &AMBus = bus.globalBus();
+    bus.initGlobalServerBus(DBusType::Session);
+    bus.setDestBus("");
+    auto &AMBus = bus.globalServerBus();
 
     registerComplexDbusType();
     ApplicationManager1Service AMService{std::make_unique<CGroupsIdentifier>(), AMBus};
     QList<DesktopFile> fileList{};
-    auto pathEnv = qgetenv("XDG_DATA_DIRS");
-    if (pathEnv.isEmpty()) {
-        qFatal() << "environment variable $XDG_DATA_DIRS is empty.";
+    QByteArray XDGDataDirs;
+    XDGDataDirs = qgetenv("XDG_DATA_DIRS");
+    if (XDGDataDirs.isEmpty()) {
+        XDGDataDirs.append("/usr/local/share/:/usr/share/");
     }
-    auto desktopFileDirs = pathEnv.split(':');
+    auto desktopFileDirs = XDGDataDirs.split(':');
 
     for (const auto &dir : desktopFileDirs) {
         auto dirPath = QDir{QDir::cleanPath(dir) + "/applications"};
diff --git a/apps/dde-application-manager/src/utils.cpp b/apps/dde-application-manager/src/utils.cpp
index a208258..8b241dc 100644
--- a/apps/dde-application-manager/src/utils.cpp
+++ b/apps/dde-application-manager/src/utils.cpp
@@ -6,7 +6,7 @@
 
 bool registerObjectToDBus(QObject *o, const QString &path, const QString &interface)
 {
-    auto &con = ApplicationManager1DBus::instance().globalBus();
+    auto &con = ApplicationManager1DBus::instance().globalServerBus();
     if (!con.registerObject(path, interface, o, QDBusConnection::RegisterOption::ExportAllContents)) {
         qFatal() << "register object failed:" << path << interface << con.lastError();
     } else {
@@ -17,6 +17,7 @@ bool registerObjectToDBus(QObject *o, const QString &path, const QString &interf
 
 void unregisterObjectFromDBus(const QString &path)
 {
-    auto &con = ApplicationManager1DBus::instance().globalBus();
+    auto &con = ApplicationManager1DBus::instance().globalServerBus();
     con.unregisterObject(path);
+    qInfo() << "unregister object:" << path;
 }
diff --git a/src/constant.h b/src/constant.h
new file mode 100644
index 0000000..bf71405
--- /dev/null
+++ b/src/constant.h
@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#ifndef CONSTANT_H
+#define CONSTANT_H
+
+constexpr auto SystemdService = u8"org.freedesktop.systemd1";
+constexpr auto SystemdObjectPath = u8"/org/freedesktop/systemd1";
+constexpr auto SystemdInterfaceName = u8"org.freedesktop.systemd1.Manager";
+constexpr auto DDEApplicationManager1ServiceName = u8"org.deepin.dde.ApplicationManager1";
+constexpr auto DDEApplicationManager1ObjectPath = u8"/org/deepin/dde/ApplicationManager1";
+constexpr auto DDEApplicationManager1ApplicationObjectPath = u8"/org/deepin/dde/ApplicationManager1/Application/";
+constexpr auto DDEApplicationManager1InstanceObjectPath = u8"/org/deepin/dde/ApplicationManager1/Instance/";
+constexpr auto DDEApplicationManager1JobManagerObjectPath = u8"/org/deepin/dde/ApplicationManager1/JobManager1";
+constexpr auto DDEApplicationManager1JobObjectPath = u8"/org/deepin/dde/ApplicationManager1/JobManager1/Job/";
+constexpr auto DesktopFileEntryKey = u8"Desktop Entry";
+constexpr auto DesktopFileActionKey = u8"Desktop Action ";
+constexpr auto ApplicationManagerServerDBusName = u8"deepin_application_manager_server_bus";
+constexpr auto ApplicationManagerDestDBusName = "deepin_application_manager_dest_bus";
+
+#endif
diff --git a/src/dbus/applicationmanager1service.cpp b/src/dbus/applicationmanager1service.cpp
index dd99fed..ce397e7 100644
--- a/src/dbus/applicationmanager1service.cpp
+++ b/src/dbus/applicationmanager1service.cpp
@@ -22,6 +22,105 @@ ApplicationManager1Service::ApplicationManager1Service(std::unique_ptr<Identifie
     }
 
     m_jobManager.reset(new JobManager1Service(this));
+
+    auto &dispatcher = SystemdSignalDispatcher::instance();
+
+    connect(&dispatcher,
+            &SystemdSignalDispatcher::SystemdUnitNew,
+            this,
+            [this](QString serviceName, QDBusObjectPath systemdUnitPath) {
+                auto [appId, instanceId] = processServiceName(serviceName);
+                if (appId.isEmpty()) {
+                    return;
+                }
+
+                for (const auto &app : m_applicationList) {
+                    if (app->id() == appId) [[unlikely]] {
+                        const auto &applicationPath = app->m_applicationPath.path();
+                        if (!app->addOneInstance(instanceId, applicationPath, systemdUnitPath.path())) {
+                            qWarning() << "add Instance failed:" << applicationPath << serviceName << systemdUnitPath.path();
+                        }
+                        return;
+                    }
+                }
+
+                qWarning() << "couldn't find application:" << serviceName << "in application manager.";
+            });
+
+    connect(&dispatcher,
+            &SystemdSignalDispatcher::SystemdUnitRemoved,
+            this,
+            [this](QString serviceName, QDBusObjectPath systemdUnitPath) {
+                auto pair = processServiceName(serviceName);
+                auto appId = pair.first, instanceId = pair.second;
+                if (appId.isEmpty()) {
+                    return;
+                }
+
+                auto appIt = std::find_if(m_applicationList.cbegin(),
+                                          m_applicationList.cend(),
+                                          [&appId](const QSharedPointer<ApplicationService> &app) {
+                                              if (app->id() == appId) {
+                                                  return true;
+                                              }
+                                              return false;
+                                          });
+
+                if (appIt == m_applicationList.cend()) [[unlikely]] {
+                    qWarning() << "couldn't find app" << appId << "in application manager.";
+                    return;
+                }
+
+                const auto &appRef = *appIt;
+
+                auto instanceIt = std::find_if(appRef->m_Instances.cbegin(),
+                                               appRef->m_Instances.cend(),
+                                               [&systemdUnitPath](const QSharedPointer<InstanceService> &value) {
+                                                   if (value->systemdUnitPath() == systemdUnitPath) {
+                                                       return true;
+                                                   }
+                                                   return false;
+                                               });
+
+                if (instanceIt != appRef->m_Instances.cend()) [[likely]] {
+                    appRef->removeOneInstance(instanceIt.key());
+                }
+            });
+}
+
+QPair<QString, QString> ApplicationManager1Service::processServiceName(const QString &serviceName)
+{
+    QString instanceId;
+    QString applicationId;
+
+    if (serviceName.endsWith(".service")) {
+        auto lastDotIndex = serviceName.lastIndexOf('.');
+        auto app = serviceName.sliced(0, lastDotIndex - 1);  // remove suffix
+
+        if (app.contains('@')) {
+            auto atIndex = app.indexOf('@');
+            instanceId = app.sliced(atIndex + 1);
+            app.remove(atIndex, instanceId.length() + 1);
+        }
+
+        applicationId = app.split('-').last();  // drop launcher if it exists.
+    } else if (serviceName.endsWith(".scope")) {
+        auto lastDotIndex = serviceName.lastIndexOf('.');
+        auto app = serviceName.sliced(0, lastDotIndex - 1);
+
+        auto components = app.split('-');
+        instanceId = components.takeLast();
+        applicationId = components.takeLast();
+    } else {
+        qDebug() << "it's not service or slice or scope.";
+        return {};
+    }
+
+    if (instanceId.isEmpty()) {
+        instanceId = QUuid::createUuid().toString(QUuid::Id128);
+    }
+
+    return qMakePair(std::move(applicationId), std::move(instanceId));
 }
 
 QList<QDBusObjectPath> ApplicationManager1Service::list() const
diff --git a/src/dbus/applicationmanager1service.h b/src/dbus/applicationmanager1service.h
index a296dc5..8d4a410 100644
--- a/src/dbus/applicationmanager1service.h
+++ b/src/dbus/applicationmanager1service.h
@@ -60,6 +60,8 @@ private:
     std::unique_ptr<Identifier> m_identifier;
     QScopedPointer<JobManager1Service> m_jobManager{nullptr};
     QMap<QDBusObjectPath, QSharedPointer<ApplicationService>> m_applicationList;
+
+    QPair<QString, QString> processServiceName(const QString &serviceName);
 };
 
 #endif
diff --git a/src/dbus/applicationservice.cpp b/src/dbus/applicationservice.cpp
index 9be823d..f9b31e4 100644
--- a/src/dbus/applicationservice.cpp
+++ b/src/dbus/applicationservice.cpp
@@ -19,6 +19,16 @@ ApplicationService::~ApplicationService()
     m_desktopSource.destruct(m_isPersistence);
 }
 
+qsizetype ApplicationService::applicationCheck(const QString &serviceName)
+{
+    const auto &ApplicationId = id();
+    if (!serviceName.startsWith(ApplicationId)) [[likely]] {
+        return 0;
+    }
+
+    return ApplicationId.size();
+}
+
 QString ApplicationService::GetActionName(const QString &identifier, const QStringList &env)
 {
     const auto &supportedActions = actions();
@@ -130,16 +140,16 @@ QDBusObjectPath ApplicationService::Launch(QString action, QStringList fields, Q
             auto resourceFile = variantValue.toString();
             if (resourceFile.isEmpty()) {
                 auto instanceRandomUUID = QUuid::createUuid().toString(QUuid::Id128);
-                commands.push_front(QString{R"(--unitName=DDE-%1@%2.service)"}.arg(
+                commands.push_front(QString{R"(--unitName=app-DDE-%1@%2.service)"}.arg(
                     this->id(), instanceRandomUUID));  // launcher should use this instanceId
                 QProcess process;
                 process.start(m_launcher, commands);
                 process.waitForFinished();
                 if (auto code = process.exitCode(); code != 0) {
                     qWarning() << "Launch Application Failed. exitCode:" << code;
-                    return false;
+                    return QString{""};
                 }
-                return addOneInstance(instanceRandomUUID, m_applicationPath.path());  // TODO: pass correct Systemd Unit Path
+                return DDEApplicationManager1InstanceObjectPath + instanceRandomUUID;
             }
 
             int location{0};
@@ -167,8 +177,9 @@ QDBusObjectPath ApplicationService::Launch(QString action, QStringList fields, Q
             auto exitCode = process.exitCode();
             if (exitCode != 0) {
                 qWarning() << "Launch Application Failed:" << binary << tmp;
+                return QString{""};
             }
-            return addOneInstance(instanceRandomUUID, m_applicationPath.path());
+            return DDEApplicationManager1InstanceObjectPath + instanceRandomUUID;
         },
         std::move(res));
 }
@@ -254,8 +265,8 @@ bool ApplicationService::addOneInstance(const QString &instanceId, const QString
 
 void ApplicationService::removeOneInstance(const QDBusObjectPath &instance)
 {
-    m_Instances.remove(instance);
     unregisterObjectFromDBus(instance.path());
+    m_Instances.remove(instance);
 }
 
 void ApplicationService::removeAllInstance()
diff --git a/src/dbus/applicationservice.h b/src/dbus/applicationservice.h
index 56d8ec9..c59fd36 100644
--- a/src/dbus/applicationservice.h
+++ b/src/dbus/applicationservice.h
@@ -18,6 +18,7 @@
 #include "global.h"
 #include "desktopentry.h"
 #include "desktopicons.h"
+#include "systemdsignaldispatcher.h"
 #include "dbus/jobmanager1service.h"
 
 class ApplicationService : public QObject
@@ -52,9 +53,9 @@ public:
     const QString &getLauncher() const noexcept { return m_launcher; }
     void setLauncher(const QString &launcher) noexcept { m_launcher = launcher; }
 
-    bool addOneInstance(const QString &instanceId, const QString &application, const QString &systemdUnitPath = "/");
+    bool addOneInstance(const QString &instanceId, const QString &application, const QString &systemdUnitPath);
     void recoverInstances(const QList<QDBusObjectPath>) noexcept;
-    void removeOneInstance(const QDBusObjectPath &instance);  // TODO: remove instance when app closed
+    void removeOneInstance(const QDBusObjectPath &instance);
     void removeAllInstance();
 
 public Q_SLOTS:
@@ -133,6 +134,7 @@ private:
     QSharedPointer<DesktopIcons> m_Icons{nullptr};
     QMap<QDBusObjectPath, QSharedPointer<InstanceService>> m_Instances;
     QString userNameLookup(uid_t uid);
+    qsizetype applicationCheck(const QString &serviceName);
     [[nodiscard]] LaunchTask unescapeExec(const QString &str, const QStringList &fields);
 };
 
diff --git a/src/dbus/jobmanager1service.h b/src/dbus/jobmanager1service.h
index 4f7fb7e..d01f883 100644
--- a/src/dbus/jobmanager1service.h
+++ b/src/dbus/jobmanager1service.h
@@ -12,6 +12,7 @@
 #include <QMutex>
 #include <QMutexLocker>
 #include <QtConcurrent>
+#include <QDBusError>
 #include <QFuture>
 #include <QUuid>
 #include "global.h"
@@ -76,7 +77,7 @@ public:
 
             QString result{job->status()};
             for (const auto &val : future.result()) {
-                if (val.canConvert<QDBusError>()) {
+                if (val.metaType().id() == QMetaType::fromType<QDBusError>().id()) {
                     result = "failed";
                 }
                 break;
diff --git a/src/global.h b/src/global.h
index 5df6fc8..65b4fdf 100644
--- a/src/global.h
+++ b/src/global.h
@@ -18,19 +18,11 @@
 #include <QDBusObjectPath>
 #include <unistd.h>
 #include <optional>
-
+#include "constant.h"
 #include "config.h"
 
 using IconMap = QMap<QString, QMap<uint, QMap<QString, QDBusUnixFileDescriptor>>>;
 
-constexpr auto DDEApplicationManager1ServiceName = u8"org.deepin.dde.ApplicationManager1";
-constexpr auto DDEApplicationManager1ObjectPath = u8"/org/deepin/dde/ApplicationManager1";
-constexpr auto DDEApplicationManager1ApplicationObjectPath = u8"/org/deepin/dde/ApplicationManager1/Application/";
-constexpr auto DDEApplicationManager1InstanceObjectPath = u8"/org/deepin/dde/ApplicationManager1/Instance/";
-constexpr auto DDEApplicationManager1JobManagerObjectPath = u8"/org/deepin/dde/ApplicationManager1/JobManager1";
-constexpr auto DDEApplicationManager1JobObjectPath = u8"/org/deepin/dde/ApplicationManager1/JobManager1/Job/";
-constexpr auto DesktopFileEntryKey = u8"Desktop Entry";
-constexpr auto DesktopFileActionKey = u8"Desktop Action ";
 inline QString getApplicationLauncherBinary()
 {
     auto value = qgetenv("DEEPIN_APPLICATION_MANAGER_APP_LAUNCH_HELPER_BIN");
@@ -41,7 +33,6 @@ inline QString getApplicationLauncherBinary()
         return value;
     }
 }
-constexpr auto ApplicationManagerDBusName = u8"deepin_application_manager_bus";
 
 enum class DBusType { Session = QDBusConnection::SessionBus, System = QDBusConnection::SystemBus, Custom };
 
@@ -52,52 +43,53 @@ public:
     ApplicationManager1DBus(ApplicationManager1DBus &&) = delete;
     ApplicationManager1DBus &operator=(const ApplicationManager1DBus &) = delete;
     ApplicationManager1DBus &operator=(ApplicationManager1DBus &&) = delete;
-    const QString &BusAddress() { return m_busAddress; }
-    void init(DBusType type, const QString &busAddress = "")
+    const QString &globalDestBusAddress() const { return m_destBusAddress; }
+    const QString &globalServerBusAddress() const { return m_serverBusAddress; }
+    void initGlobalServerBus(DBusType type, const QString &busAddress = "")
     {
         if (m_initFlag) {
             return;
         }
 
-        m_busAddress = busAddress;
-        m_type = type;
+        m_serverBusAddress = busAddress;
+        m_serverType = type;
         m_initFlag = true;
         return;
     }
 
-    QDBusConnection &globalBus()
+    QDBusConnection &globalServerBus()
     {
-        if (m_connection.has_value()) {
-            return m_connection.value();
+        if (m_serverConnection.has_value()) {
+            return m_serverConnection.value();
         }
 
         if (!m_initFlag) {
             qFatal() << "invoke init at first.";
         }
 
-        switch (m_type) {
+        switch (m_serverType) {
             case DBusType::Session:
                 [[fallthrough]];
             case DBusType::System: {
-                m_connection.emplace(
-                    QDBusConnection::connectToBus(static_cast<QDBusConnection::BusType>(m_type), ApplicationManagerDBusName));
-                if (!m_connection->isConnected()) {
-                    qFatal() << m_connection->lastError();
+                m_serverConnection.emplace(QDBusConnection::connectToBus(static_cast<QDBusConnection::BusType>(m_serverType),
+                                                                         ApplicationManagerServerDBusName));
+                if (!m_serverConnection->isConnected()) {
+                    qFatal() << m_serverConnection->lastError();
                 }
-                return m_connection.value();
+                return m_serverConnection.value();
             }
             case DBusType::Custom: {
-                if (m_busAddress.isEmpty()) {
+                if (m_serverBusAddress.isEmpty()) {
                     qFatal() << "connect to custom dbus must init this object by custom dbus address";
                 }
-                m_connection.emplace(
-                    QDBusConnection::connectToBus(static_cast<QDBusConnection::BusType>(m_type), ApplicationManagerDBusName));
-                if (!m_connection->isConnected()) {
-                    qFatal() << m_connection->lastError();
+                m_serverConnection.emplace(QDBusConnection::connectToBus(m_serverBusAddress, ApplicationManagerServerDBusName));
+                if (!m_serverConnection->isConnected()) {
+                    qFatal() << m_serverConnection->lastError();
                 }
-                return m_connection.value();
+                return m_serverConnection.value();
             }
         }
+
         Q_UNREACHABLE();
     }
     static ApplicationManager1DBus &instance()
@@ -106,13 +98,52 @@ public:
         return dbus;
     }
 
+    QDBusConnection &globalDestBus()
+    {
+        if (!m_destConnection) {
+            qFatal() << "please set which bus should application manager to use to invoke other D-Bus service's method.";
+        }
+        return m_destConnection.value();
+    }
+
+    void setDestBus(const QString &destAddress)
+    {
+        if (m_destConnection) {
+            m_destConnection->disconnectFromBus(ApplicationManagerDestDBusName);
+        }
+
+        m_destBusAddress = destAddress;
+
+        if (m_destBusAddress.isEmpty()) {
+            m_destConnection.emplace(
+                QDBusConnection::connectToBus(QDBusConnection::BusType::SessionBus, ApplicationManagerDestDBusName));
+            if (!m_destConnection->isConnected()) {
+                qFatal() << m_destConnection->lastError();
+            }
+            return;
+        } else {
+            if (m_destBusAddress.isEmpty()) {
+                qFatal() << "connect to custom dbus must init this object by custom dbus address";
+            }
+            m_destConnection.emplace(QDBusConnection::connectToBus(m_destBusAddress, ApplicationManagerDestDBusName));
+            if (!m_destConnection->isConnected()) {
+                qFatal() << m_destConnection->lastError();
+            }
+            return;
+        }
+
+        Q_UNREACHABLE();
+    }
+
 private:
     ApplicationManager1DBus() = default;
     ~ApplicationManager1DBus() = default;
     bool m_initFlag;
-    DBusType m_type;
-    QString m_busAddress;
-    std::optional<QDBusConnection> m_connection{std::nullopt};
+    DBusType m_serverType;
+    QString m_serverBusAddress;
+    QString m_destBusAddress;
+    std::optional<QDBusConnection> m_destConnection{std::nullopt};
+    std::optional<QDBusConnection> m_serverConnection{std::nullopt};
 };
 
 bool registerObjectToDBus(QObject *o, const QString &path, const QString &interface);
diff --git a/src/systemdsignaldispatcher.cpp b/src/systemdsignaldispatcher.cpp
new file mode 100644
index 0000000..bdda93b
--- /dev/null
+++ b/src/systemdsignaldispatcher.cpp
@@ -0,0 +1,50 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include "systemdsignaldispatcher.h"
+
+bool SystemdSignalDispatcher::connectToSignals() noexcept
+{
+    auto &con = ApplicationManager1DBus::instance().globalDestBus();
+
+    if (!con.connect(SystemdService,
+                     SystemdObjectPath,
+                     SystemdInterfaceName,
+                     "UnitNew",
+                     this,
+                     SLOT(onUnitNew(QString, QDBusObjectPath)))) {
+        qCritical() << "can't connect to UnitNew signal of systemd service.";
+        return false;
+    }
+
+    if (!con.connect(SystemdService,
+                     SystemdObjectPath,
+                     SystemdInterfaceName,
+                     "UnitRemoved",
+                     this,
+                     SLOT(onUnitRemoved(QString, QDBusObjectPath)))) {
+        qCritical() << "can't connect to UnitRemoved signal of systemd service.";
+        return false;
+    }
+
+    return true;
+}
+
+void SystemdSignalDispatcher::onUnitNew(QString serviceName, QDBusObjectPath systemdUnitPath)
+{
+    if (!serviceName.startsWith("app-")) {
+        return;
+    }
+
+    emit SystemdUnitNew(serviceName.sliced(4), systemdUnitPath);  // remove "app-"
+}
+
+void SystemdSignalDispatcher::onUnitRemoved(QString serviceName, QDBusObjectPath systemdUnitPath)
+{
+    if (!serviceName.startsWith("app-")) {
+        return;
+    }
+
+    emit SystemdUnitRemoved(serviceName.sliced(4), systemdUnitPath);
+}
diff --git a/src/systemdsignaldispatcher.h b/src/systemdsignaldispatcher.h
new file mode 100644
index 0000000..06c097e
--- /dev/null
+++ b/src/systemdsignaldispatcher.h
@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#ifndef SYSTEMDSIGNALDISPATCHER_H
+#define SYSTEMDSIGNALDISPATCHER_H
+
+#include "global.h"
+
+class SystemdSignalDispatcher : public QObject
+{
+    Q_OBJECT
+public:
+    ~SystemdSignalDispatcher() = default;
+    static SystemdSignalDispatcher &instance()
+    {
+        static SystemdSignalDispatcher dispatcher;
+        return dispatcher;
+    }
+Q_SIGNALS:
+    void SystemdUnitNew(QString serviceName, QDBusObjectPath systemdUnitPath);
+    void SystemdUnitRemoved(QString serviceName, QDBusObjectPath systemdUnitPath);
+
+private Q_SLOTS:
+    void onUnitNew(QString serviceName, QDBusObjectPath systemdUnitPath);
+    void onUnitRemoved(QString serviceName, QDBusObjectPath systemdUnitPath);
+
+private:
+    explicit SystemdSignalDispatcher(QObject *parent = nullptr)
+        : QObject(parent)
+    {
+        if (!connectToSignals()) {
+            std::terminate();
+        }
+    }
+    bool connectToSignals() noexcept;
+};
+
+#endif