2 files changed, 51 insertions, 13 deletions

diff --git a/src/libjin/common/singleton.h b/src/libjin/common/singleton.h
new file mode 100644
index 0000000..e6326b2
--- /dev/null
+++ b/src/libjin/common/singleton.h
@@ -0,0 +1,34 @@
+#ifndef __JIN_SINGLETON_H
+#define __JIN_SINGLETON_H
+
+namespace jin
+{
+    template<class T>
+    class Singleton
+    {
+    public:
+        static T* get()
+        {
+            if (_instance == nullptr)
+                _instance = new T;
+            return _instance;
+        }
+        static void destroy()
+        {
+            delete _instance;
+            _instance = nullptr;
+        }
+    protected:
+        Singleton() {};
+        virtual ~Singleton() {};
+    private: 
+        Singleton(const Singleton&);
+        Singleton& operator = (const Singleton&);
+
+        static T* _instance;
+    };
+
+    template<class T> T* Singleton<T>::_instance = nullptr;
+}
+
+#endif
\ No newline at end of file
diff --git a/src/libjin/common/subsystem.h b/src/libjin/common/subsystem.h
index abe509e..4f3c5ab 100644
--- a/src/libjin/common/subsystem.h
+++ b/src/libjin/common/subsystem.h
@@ -1,32 +1,36 @@
 #ifndef __JIN_COMMON_SUBSYSTEM_H
 #define __JIN_COMMON_SUBSYSTEM_H
 
+#include "singleton.h"
 #include "../utils/macros.h"
 
 namespace jin
 {
 
-    class Subsystem 
+    template<class System>
+    class Subsystem : public Singleton<System>
     {
+    public: 
+        struct Setting {}; 
+        typedef Setting SettingBase; 
 
-    public:
+        void init(const SettingBase* setting)
+        {
+            initSystem(setting);
+        }
 
-        struct Setting {};
-
-        typedef Subsystem::Setting SettingBase;
-
-        virtual bool init(const Setting* setting) = 0;
-
-        virtual void quit() = 0;
+        void quit()
+        {
+            quitSystem();
+            destroy();
+        }
 
     protected:
-
         Subsystem() {};
         virtual ~Subsystem() {};
 
-        virtual onlyonce bool _init(const Setting* setting) = 0;
-        virtual onlyonce void _quit() = 0;
-
+        virtual bool initSystem(const Setting* setting) = 0;
+        virtual void quitSystem() = 0;
     };
 
 }