diff --git a/src/ts/@overflow/app/views/member/SignIn.tsx b/src/ts/@overflow/app/views/member/SignIn.tsx
index b7e8caa..7fc5141 100644
--- a/src/ts/@overflow/app/views/member/SignIn.tsx
+++ b/src/ts/@overflow/app/views/member/SignIn.tsx
@@ -2,12 +2,19 @@ import * as React from 'react';
 import { RouteComponentProps } from 'react-router';
 import SignInContainer from '@overflow/member/react/SignIn';
 import WebSocketRPC from '@overflow/commons/websocket/WebSocketRPC';
+import AppContext from '@overflow/commons/context';
 import inject from '@overflow/commons/context/decorator/inject';
 
 class Signin extends React.Component<RouteComponentProps<object>, object> {
   @inject()
   private client: WebSocketRPC;
 
+  public constructor(props?: RouteComponentProps<object>, context?: object) {
+    super(props, context);
+
+    let con = AppContext.get<WebSocketRPC>();
+  }
+
   public render(): JSX.Element {
     return (
         <SignInContainer/>
diff --git a/src/ts/@overflow/commons/api/Service.ts b/src/ts/@overflow/commons/api/Service.ts
index cb8e7c1..c181b1d 100644
--- a/src/ts/@overflow/commons/api/Service.ts
+++ b/src/ts/@overflow/commons/api/Service.ts
@@ -2,7 +2,7 @@ import inject from '../context/decorator/inject';
 import WebSocketRPC from '../websocket/WebSocketRPC';
 
 abstract class Service {
-  @inject(WebSocketRPC)
+  @inject()
   private webSocketRPC: WebSocketRPC;
   private name: string;
   protected constructor(name: string) {
diff --git a/src/ts/@overflow/commons/context/decorator/inject.ts b/src/ts/@overflow/commons/context/decorator/inject.ts
index f60deb6..8c3da12 100644
--- a/src/ts/@overflow/commons/context/decorator/inject.ts
+++ b/src/ts/@overflow/commons/context/decorator/inject.ts
@@ -1,15 +1,17 @@
 import * as METADATA from '../constants';
 
+export interface Config {
+  qualifier?: string;
+  required?: boolean;
+}
 
-const inject = <TFunction extends Function>(type?: TFunction) => {
+const inject = (config?: Config) => {
   return (target: Object, propertyKey: string | symbol, parameterIndex?: number): void => {
     if (typeof parameterIndex === 'number') {
       // tagParameter(target, targetKey, index, metadata);
     } else {
       let types = Reflect.getMetadata('design:type', target, propertyKey);
 
-      let aaa = type;
-      console.log(aaa);
       // tagProperty(target, targetKey, metadata);
     }
   };
diff --git a/src/ts/@overflow/commons/context/decorator/injectable.ts b/src/ts/@overflow/commons/context/decorator/injectable.ts
index 6af70b8..eac4cef 100644
--- a/src/ts/@overflow/commons/context/decorator/injectable.ts
+++ b/src/ts/@overflow/commons/context/decorator/injectable.ts
@@ -1,17 +1,29 @@
 import * as METADATA from '../constants';
 
-function injectable(): ClassDecorator {
+export interface Config {
+  qualifier?: string;
+  scope?: Scope;
+}
+
+export enum Scope {
+  SINGLETON = 1,
+  PROTOTYPE,
+}
+
+const injectable = (config?: Config) => {
   return <TFunction extends Function>(target: TFunction): TFunction | void => {
 
     if (Reflect.hasOwnMetadata(METADATA.PARAM_TYPES, target) === true) {
       throw new Error('Cannot apply @injectable decorator multiple times.');
     }
 
-    let types = Reflect.getMetadata(METADATA.DESIGN_PARAM_TYPES, target) || [];
+    let types = Reflect.getMetadata(METADATA.DESIGN_PARAM_TYPES, target);
     Reflect.defineMetadata(METADATA.PARAM_TYPES, types, target);
 
+    const name = target.name;
+
     return target;
   };
-}
+};
 
 export default injectable;
diff --git a/src/ts/@overflow/commons/context/index.ts b/src/ts/@overflow/commons/context/index.ts
index a49a233..9d4f7d1 100644
--- a/src/ts/@overflow/commons/context/index.ts
+++ b/src/ts/@overflow/commons/context/index.ts
@@ -1,5 +1,5 @@
 class AppContext {
-  private static context: AppContext;
+  private static context: AppContext = null;
 
   private constructor() {
 
@@ -9,7 +9,16 @@ class AppContext {
     return null;
   }
 
+  public static get<T>(): T {
+
+
+    return null;
+  }
+
   public static getContext(): AppContext {
+    if (null === AppContext.context) {
+      AppContext.context = new AppContext();
+    }
     return AppContext.context;
   }
 }