NotificationServer: Close connection on notification close

When the notification was closed, the connection was kept around. This
caused the core event loop to take up nearly all CPU, so instead of
checking the connection we clear it on close and add state variables
to check state.

Userland/Libraries/LibGUI/Notification.cpp

@@ -34,23 +34,28 @@ namespace GUI {
 class NotificationServerConnection : public IPC::ServerConnection<NotificationClientEndpoint, NotificationServerEndpoint>
     , public NotificationClientEndpoint {
     C_OBJECT(NotificationServerConnection)
+
+    friend class Notification;
+
 public:
     virtual void handshake() override
     {
         send_sync<Messages::NotificationServer::Greet>();
     }
 
-    virtual void die() override { m_connected = false; }
+    virtual void die() override
-
+    {
-    bool is_connected() const { return m_connected; }
+        m_notification->connection_closed();
+    }
 
 private:
-    NotificationServerConnection()
+    explicit NotificationServerConnection(Notification* notification)
         : IPC::ServerConnection<NotificationClientEndpoint, NotificationServerEndpoint>(*this, "/tmp/portal/notify")
+        , m_notification(notification)
     {
     }
     virtual void handle(const Messages::NotificationClient::Dummy&) override { }
-    bool m_connected { true };
+    Notification* m_notification;
 };
 
 Notification::Notification()
@@ -63,25 +68,27 @@ Notification::~Notification()
 
 void Notification::show()
 {
-    VERIFY(!m_connection);
+    VERIFY(!m_shown && !m_destroyed);
     auto icon = m_icon ? m_icon->to_shareable_bitmap() : Gfx::ShareableBitmap();
-    m_connection = NotificationServerConnection::construct();
+    m_connection = NotificationServerConnection::construct(this);
     m_connection->send_sync<Messages::NotificationServer::ShowNotification>(m_text, m_title, icon);
+    m_shown = true;
 }
 
 void Notification::close()
 {
-    VERIFY(m_connection);
+    VERIFY(m_shown);
-    if (!m_connection->is_connected()) {
+    if (!m_destroyed) {
+        m_connection->send_sync<Messages::NotificationServer::CloseNotification>();
+        connection_closed();
         return;
     }
-    m_connection->send_sync<Messages::NotificationServer::CloseNotification>();
 }
 
 bool Notification::update()
 {
-    VERIFY(m_connection);
+    VERIFY(m_shown);
-    if (!m_connection->is_connected()) {
+    if (m_destroyed) {
         return false;
     }
 
@@ -99,4 +106,10 @@ bool Notification::update()
     return true;
 }
 
+void Notification::connection_closed()
+{
+    m_connection.clear();
+    m_destroyed = true;
+}
+
 }

Userland/Libraries/LibGUI/Notification.h

@@ -36,6 +36,8 @@ class NotificationServerConnection;
 class Notification : public Core::Object {
     C_OBJECT(Notification);
 
+    friend class NotificationServerConnection;
+
 public:
     virtual ~Notification() override;
 
@@ -64,9 +66,13 @@ public:
     bool update();
     void close();
 
+    bool is_showing() const { return m_shown && !m_destroyed; }
+
 private:
     Notification();
 
+    void connection_closed();
+
     String m_title;
     bool m_title_dirty;
     String m_text;
@@ -74,6 +80,8 @@ private:
     RefPtr<Gfx::Bitmap> m_icon;
     bool m_icon_dirty;
 
+    bool m_destroyed { false };
+    bool m_shown { false };
     RefPtr<NotificationServerConnection> m_connection;
 };