1 files changed, 39 insertions, 5 deletions

diff --git a/src/libjin/Common/je_subsystem.hpp b/src/libjin/Common/je_subsystem.hpp
index 4966a9d..d8e106d 100644
--- a/src/libjin/Common/je_subsystem.hpp
+++ b/src/libjin/Common/je_subsystem.hpp
@@ -8,22 +8,40 @@
 namespace JinEngine
 {
 
+    ///
+    /// Subsystem class.
+    ///
     template<class System>
     class Subsystem : public Singleton<System>
     {
     public: 
-        struct Setting {}; 
+        ///
+        /// Subsystem setting.
+        ///
+        struct Setting 
+        {
+        }; 
+
         typedef Setting SettingBase; 
 
+        ///
+        /// Initialize subsystem.
+        /// 
+        /// @param setting Subsystem setting.
+        /// @return True if initialize sucessful, otherwise return false.
+        ///
         bool init(const SettingBase* setting = nullptr)
         {
             static bool success = initSystem(setting);
             return success;
         }
 
+        ///
+        /// Quit subsystem.
+        ///
         void quit()
         {
-			/*call only once*/
+            // Call only once.
 			static char __dummy__ = (quitSystem(), 1);
 			Singleton<System>::destroy();
         }
@@ -31,11 +49,27 @@ namespace JinEngine
     protected:
         singleton(System);
 
+        ///
+        /// Subsystem constructor.
+        ///
         Subsystem() {};
-        virtual ~Subsystem() {};
 
-		/*onlyonce*/ virtual bool initSystem(const Setting* setting) = 0;
-		/*onlyonce*/ virtual void quitSystem() = 0;
+        /// 
+        /// Subsystem destructor.
+        ///
+        virtual ~Subsystem() 
+        {
+        };
+
+        ///
+        /// Initializer callback.
+        ///
+		virtual bool initSystem(const Setting* setting) = 0;
+
+        ///
+        /// Quit subsystem callback.
+        ///
+		virtual void quitSystem() = 0;
 
     };