diff --git a/example/layers/ui_layer/ui_layer.cpp b/example/layers/ui_layer/ui_layer.cpp
index b96af52..367b790 100755
--- a/example/layers/ui_layer/ui_layer.cpp
+++ b/example/layers/ui_layer/ui_layer.cpp
@@ -6,14 +6,14 @@ namespace example
 {
   void ui_layer::on_attach() 
   {
-    VE::CONNECT(this);
+    CONNECT(this);
 
     hack::log()("on_attach");
   }
 
   void ui_layer::on_detach() 
   {
-    VE::DISCONNECT(this);
+    DISCONNECT();
     hack::log()("on_detach");
   }
 
@@ -26,20 +26,7 @@ namespace example
 
     VE_PUSH_FONT(REGULAR, 20);
     if (ImGui::Button("Test signal", ImVec2(128, 130))) 
-      VE::EMIT(test_event::TEST_EVEN, std::string("test event message"), 1, "event MSG");
-
-    // try
-    // {
-    //   if (ImGui::Button("Test signal log error", ImVec2(128, 130))) 
-    //     VE::EMIT(test_event::TEST_EVEN, std::string("test event message"));
-    // }
-    // catch(hack::exception& e)
-    // {
-    //   e.log();
-    //   auto data = std::any_cast<VE::event>(e.get_data());
-    //   hack::log()(data.m_id);
-    // }
-
+      EMIT(test_event::TEST_EVEN, std::string("test event message"), 1);
     VE_POP_FONT();
 
 
diff --git a/example/layers/ui_layer/ui_layer.hpp b/example/layers/ui_layer/ui_layer.hpp
index c2b1cc8..53ac3c6 100755
--- a/example/layers/ui_layer/ui_layer.hpp
+++ b/example/layers/ui_layer/ui_layer.hpp
@@ -4,7 +4,7 @@
 
 namespace example
 {
-  class ui_layer : public VE::layer, public VE::flags
+  class ui_layer : public VE::layer, public VE::flags, public VE::connector
   {
     VE_OVERIDE();
 
diff --git a/example/layers/ui_layer_double/ui_layer_double.cpp b/example/layers/ui_layer_double/ui_layer_double.cpp
index 653bf4f..ab5fe10 100755
--- a/example/layers/ui_layer_double/ui_layer_double.cpp
+++ b/example/layers/ui_layer_double/ui_layer_double.cpp
@@ -6,14 +6,14 @@ namespace example
 {
   void ui_layer_double::on_attach() 
   {
-    VE::CONNECT(this);
+    CONNECT(this);
 
     hack::log()("on_attach");
   }
 
   void ui_layer_double::on_detach() 
   {
-    VE::DISCONNECT(this);
+    DISCONNECT();
     hack::log()("on_detach");
   }
 
@@ -26,7 +26,7 @@ namespace example
 
     VE_PUSH_FONT(REGULAR, 20);
     if (ImGui::Button("Test signal_double", ImVec2(128, 130))) 
-      VE::EMIT(test_event::TEST_EVEN, std::string("test event message ui_layer_double"));
+      EMIT(test_event::TEST_EVEN, std::string("test event message ui_layer_double"));
 
     if (ImGui::Button("Test on_detach", ImVec2(128, 130))) on_detach();
     if (ImGui::Button("Test on_attach", ImVec2(128, 130))) on_attach();
diff --git a/example/layers/ui_layer_double/ui_layer_double.hpp b/example/layers/ui_layer_double/ui_layer_double.hpp
index 499e354..14b70f7 100755
--- a/example/layers/ui_layer_double/ui_layer_double.hpp
+++ b/example/layers/ui_layer_double/ui_layer_double.hpp
@@ -4,7 +4,7 @@
 
 namespace example
 {
-  class ui_layer_double : public VE::layer, public VE::flags
+  class ui_layer_double : public VE::layer, public VE::flags, public VE::connector
   {
     VE_OVERIDE();
 
diff --git a/src/VE.hpp b/src/VE.hpp
index fd3db06..62450cd 100755
--- a/src/VE.hpp
+++ b/src/VE.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
 #include "event/event.hpp" // IWYU pragma: keep
-#include "event/api.hpp" // IWYU pragma: keep
+#include "event/connector.hpp" // IWYU pragma: keep
 #include "event/event_manager.hpp" // IWYU pragma: keep
 #include "event/type.hpp" // IWYU pragma: keep
 
diff --git a/src/application/application.cpp b/src/application/application.cpp
index 3361565..43f41dc 100755
--- a/src/application/application.cpp
+++ b/src/application/application.cpp
@@ -1,7 +1,5 @@
 #include "application.hpp"
 
-#include "utils/utils.hpp" 
-
 namespace VE
 {
   application::application(std::string app_name) : m_glfw{ std::make_unique<glfw>() }
diff --git a/src/event/api.hpp b/src/event/api.hpp
deleted file mode 100755
index b01c3e7..0000000
--- a/src/event/api.hpp
+++ /dev/null
@@ -1,29 +0,0 @@
-#pragma once
-
-#include "event_manager.hpp"
-
-namespace VE
-{
-  template <typename T>
-  void CONNECT(T* obj) 
-  {
-    event_manager::instance().connect(obj, &T::on_event);
-  }
-
-  template <typename T>
-  void DISCONNECT(T* obj) 
-  {
-    event_manager::instance().disconnect(obj, &T::on_event);
-  }
-
-  template <typename TYPE, typename DATA>
-  void EMIT(TYPE t, DATA d, int id = -1, std::string msg = "")
-  {
-    event_manager::instance().emit(event{ t, d, id, msg});
-  }
-
-  inline void EMIT(event e)
-  {
-    event_manager::instance().emit(e);
-  }
-}
diff --git a/src/event/connector.hpp b/src/event/connector.hpp
new file mode 100755
index 0000000..1a75388
--- /dev/null
+++ b/src/event/connector.hpp
@@ -0,0 +1,70 @@
+#pragma once
+
+#include "event_manager.hpp"
+
+namespace VE
+{
+  class connector
+  {
+    protected:
+      template <typename T>
+      void CONNECT(T* obj) 
+      {
+        if (!m_key.empty())
+        {
+          hack::warn()("key not empty", m_key);
+          return;
+        }
+        m_key = event_manager::instance().connect(obj, &T::on_event);
+      }
+
+      inline void DISCONNECT() 
+      {
+        if (m_key.empty())
+        {
+          hack::warn()("key is empty", m_key);
+          return;
+        }
+        event_manager::instance().disconnect(m_key);
+        m_key.clear();
+      }
+
+    public:
+      template <typename TYPE, typename DATA>
+      static void EMIT(TYPE t, DATA d, int id = -1)
+      {
+        event_manager::instance().emit(event{ t, d, id});
+      }
+
+      static void EMIT(event e)
+      {
+        event_manager::instance().emit(e);
+      }
+
+    private:
+      std::string m_key;
+  };
+
+  // template <typename T>
+  // void CONNECT(T* obj) 
+  // {
+  //   event_manager::instance().connect(obj, &T::on_event);
+  // }
+  //
+  // template <typename T>
+  // void DISCONNECT(T* obj) 
+  // {
+  //   event_manager::instance().disconnect(obj, &T::on_event);
+  // }
+
+  // template <typename TYPE, typename DATA>
+  // void EMIT(TYPE t, DATA d, int id = -1)
+  // {
+  //   event_manager::instance().emit(event{ t, d, id});
+  // }
+  //
+  // inline void EMIT(event e)
+  // {
+  //   event_manager::instance().emit(e);
+  // }
+}
diff --git a/src/event/event.hpp b/src/event/event.hpp
index bfe6b8a..5a98afc 100755
--- a/src/event/event.hpp
+++ b/src/event/event.hpp
@@ -1,18 +1,16 @@
 #pragma once
 
 #include <any>
-#include <string>
 
 namespace VE
 {
   struct event
   {
-    event(std::any type, std::any data, int id, std::string msg) : m_type{ type }, m_data{ data }, m_id { id }, m_msg { msg } {}
+    event(std::any type, std::any data, int id) : m_type{ type }, m_data{ data }, m_id { id } {}
     ~event() = default;
 
     std::any m_type;
     std::any m_data;
     int m_id;
-    std::string m_msg;
   };
 }
diff --git a/src/event/event_manager.hpp b/src/event/event_manager.hpp
index 64b9cff..76827e1 100755
--- a/src/event/event_manager.hpp
+++ b/src/event/event_manager.hpp
@@ -1,80 +1,132 @@
 #pragma once
 
-#include <functional>
 #include <hack/patterns/singleton.hpp>
 #include <hack/logger/logger.hpp>
 #include <hack/security/uuid.hpp>
-#include <hack/exception/exception.hpp>
 
 #include "event.hpp"
+#include "utils/using.hpp"
 
 namespace VE
 {
   struct event_manager : public hack::patterns::singleton<event_manager>
   {
+    template<typename T>
+    std::string connect(T* obj, void (T::*method)(event)) 
+    {
+      std::string key = hack::security::generate_uuid();
+      m_funcs[key] = std::bind(method, obj, std::placeholders::_1);
+      return key;
+    }
+
+    void disconnect(std::string key) 
+    {
+      auto it = m_funcs.find(key);
+      if (it != m_funcs.end())
+        m_funcs.erase(it);
+      hack::log()(m_funcs.size());
+    }
+
     void emit(event e)
     {
-      if (m_funcs.size() == 0) 
-      {
-        hack::warn()("funs is empty");
-        return;
-      }
-      else if (!e.m_msg.empty())
-      {
-        hack::warn()("EMIT MSG:", e.m_msg, m_funcs.size());
-      }
-
-      std::size_t i = 0;
       try
       {
-        for(;i < m_funcs.size();++i) m_funcs[i].m_func(e);
+        for(auto [key, f] : m_funcs) m_funcs[key](e);
       }
-      catch(std::exception& ext)
+      catch(const std::exception& ex)
       {
-        hack::error()("call function is error:", ext.what());
-        hack::exception ex;
-        ex.system_error(ext);
-        ex.set_data(e);
-        throw ex;
+        hack::error()(ex.what());
+        hack::log()("size funcs", m_funcs.size());
       }
       catch(...)
       {
-        hack::error()("call function is error:", "oopps...");
-        hack::exception ex;
-        ex.set_data(e);
-        throw ex;
+        hack::error()("ooops...");
       }
     }
 
-    struct EventHandler 
-    {
-      std::function<void(event)> m_func;
-      void* m_obj;
-    };
-
-    std::vector<EventHandler> m_funcs;
-
-    template<typename T>
-    void connect(T* obj, void (T::*method)(event)) 
-    {
-      m_funcs.push_back({
-        std::bind(method, obj, std::placeholders::_1),
-        static_cast<void*>(obj)
-      });
-      hack::warn()("connect (size)", m_funcs.size());
-    }
-
-    template<typename T>
-    void disconnect(T* obj, void (T::*method)(event)) 
-    {
-      m_funcs.erase(
-        std::remove_if(m_funcs.begin(), m_funcs.end(),
-          [obj](const auto& handler) {
-            return handler.m_obj == obj;
-          }),
-        m_funcs.end()
-      );
-      hack::warn()("disconnect (size)", m_funcs.size());
-    }
+    std::map<std::string, event_fn<event>> m_funcs;
   };
 }
+
+
+// #pragma once
+//
+// #include <functional>
+// #include <hack/patterns/singleton.hpp>
+// #include <hack/logger/logger.hpp>
+// #include <hack/security/uuid.hpp>
+// #include <hack/exception/exception.hpp>
+//
+// #include "event.hpp"
+//
+// namespace VE
+// {
+//   struct event_manager : public hack::patterns::singleton<event_manager>
+//   {
+//     void emit(event e)
+//     {
+//       if (m_funcs.size() == 0) 
+//       {
+//         hack::warn()("funs is empty");
+//         return;
+//       }
+//       else if (!e.m_msg.empty())
+//       {
+//         hack::warn()("EMIT MSG:", e.m_msg, m_funcs.size());
+//       }
+//
+//       std::size_t i = 0;
+//       try
+//       {
+//         for(;i < m_funcs.size();++i) m_funcs[i].m_func(e);
+//       }
+//       catch(std::exception& ext)
+//       {
+//         hack::error()("call function is error:", ext.what());
+//         hack::exception ex;
+//         ex.system_error(ext);
+//         ex.set_data(e);
+//         throw ex;
+//       }
+//       catch(...)
+//       {
+//         hack::error()("call function is error:", "oopps...");
+//         hack::exception ex;
+//         ex.set_data(e);
+//         throw ex;
+//       }
+//     }
+//
+//     template<typename T>
+//     void connect(T* obj, void (T::*method)(event)) 
+//     {
+//       m_funcs.push_back({
+//         std::bind(method, obj, std::placeholders::_1),
+//         static_cast<void*>(obj)
+//       });
+//       hack::warn()("connect (size)", m_funcs.size());
+//     }
+//
+//     template<typename T>
+//     void disconnect(T* obj, void (T::*method)(event)) 
+//     {
+//       m_funcs.erase(
+//         std::remove_if(m_funcs.begin(), m_funcs.end(),
+//           [obj](const auto& handler) {
+//             return handler.m_obj == obj;
+//           }),
+//         m_funcs.end()
+//       );
+//       hack::warn()("disconnect (size)", m_funcs.size());
+//     }
+//
+//     struct EventHandler 
+//     {
+//       std::function<void(event)> m_func;
+//       void* m_obj;
+//     };
+//
+//     std::vector<EventHandler> m_funcs;
+//
+//   };
+// }
diff --git a/src/glfw/glfw.cpp b/src/glfw/glfw.cpp
index ff1e0e6..8972018 100755
--- a/src/glfw/glfw.cpp
+++ b/src/glfw/glfw.cpp
@@ -1,7 +1,7 @@
 #include "glfw.hpp"
 
 #include "event/type.hpp"
-#include "event/api.hpp"
+#include "event/connector.hpp"
 
 namespace VE
 {
@@ -124,17 +124,17 @@ namespace VE
       {
         case GLFW_PRESS:
         {
-          VE::EMIT(event_type::KEY_PRESSED, key);
+          connector::EMIT(event_type::KEY_PRESSED, key);
           break;
         }
         case GLFW_RELEASE:
         {
-          VE::EMIT(event_type::KEY_RELEASED, key);
+          connector::EMIT(event_type::KEY_RELEASED, key);
           break;
         }
 				case GLFW_REPEAT:
 				{
-          VE::EMIT(event_type::KEY_REPEATE, key);
+          connector::EMIT(event_type::KEY_REPEATE, key);
           break;
 				}
       }
@@ -155,16 +155,16 @@ namespace VE
           std::chrono::duration<double, std::milli> duration = local - time;
 
           if (duration.count() > 10 && duration.count() < 200)
-            VE::EMIT(event_type::MOUSE_BUTTON_DOUBLE_PRESSED, button);
+            connector::EMIT(event_type::MOUSE_BUTTON_DOUBLE_PRESSED, button);
           else
-            VE::EMIT(event_type::MOUSE_BUTTON_PRESSED, button);
+            connector::EMIT(event_type::MOUSE_BUTTON_PRESSED, button);
 
           time = local;
 					break;
 				}
 				case GLFW_RELEASE:
 				{
-          VE::EMIT(event_type::MOUSE_BUTTON_RELEASED, button);
+          connector::EMIT(event_type::MOUSE_BUTTON_RELEASED, button);
 					break;
 				}
 			}
@@ -175,7 +175,7 @@ namespace VE
       try
       {
         auto data = std::pair<float, float>{ static_cast<float>(xOffset), static_cast<float>(yOffset) };
-        VE::EMIT(event_type::MOUSE_SCROLL, data);
+        connector::EMIT(event_type::MOUSE_SCROLL, data);
       }
       catch(std::exception& e)
       {
@@ -188,7 +188,7 @@ namespace VE
       try
       {
         auto data = std::pair<float, float>{ static_cast<float>(xPos), static_cast<float>(yPos) };
-        VE::EMIT(event_type::MOUSE_CURSOR_POSITION, data);
+        connector::EMIT(event_type::MOUSE_CURSOR_POSITION, data);
       }
       catch(std::exception& e)
       {
@@ -210,7 +210,7 @@ namespace VE
       try
       {
         auto data = std::pair<float, float>{ static_cast<float>(width), static_cast<float>(height) };
-        VE::EMIT(event_type::WINDOW_RESIZE, data);
+        connector::EMIT(event_type::WINDOW_RESIZE, data);
       }
       catch(std::exception& e)
       {
@@ -222,7 +222,7 @@ namespace VE
     {
       try
       {
-        VE::EMIT(event_type::WINDOW_CLOSE, nullptr);
+        connector::EMIT(event_type::WINDOW_CLOSE, nullptr);
       }
       catch(std::exception& e)
       {
@@ -234,7 +234,7 @@ namespace VE
     {
       try
       {
-        VE::EMIT(event_type::WINDOW_FOCUS, focused);
+        connector::EMIT(event_type::WINDOW_FOCUS, focused);
       }
       catch(std::exception& e)
       {
diff --git a/src/layer/layer.hpp b/src/layer/layer.hpp
index 91a49b9..07de696 100755
--- a/src/layer/layer.hpp
+++ b/src/layer/layer.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <string>
 #include "event/event.hpp"
 #include "utils/using.hpp"
 
@@ -23,6 +24,7 @@ namespace VE
 
     protected:
       event_fn<event> execute;
+      std::string m_key;
   };
 }