Introducing new features.优化

@@ -41,6 +41,7 @@ public class CIMServerHandle extends SimpleChannelInboundHandler<CIMRequestProto
         CIMUserInfo userInfo = SessionSocketHolder.getUserId((NioSocketChannel) ctx.channel());
         LOGGER.info("用户[{}]下线",userInfo.getUserName());
         SessionSocketHolder.remove((NioSocketChannel) ctx.channel());
+        SessionSocketHolder.removeSession(userInfo.getUserId());
 
         //清除路由关系
         clearRouteInfo(userInfo);

@@ -21,6 +21,10 @@ public class SessionSocketHolder {
         SESSION_MAP.put(userId, userName);
     }
 
+    public static void removeSession(Long userId){
+        SESSION_MAP.remove(userId) ;
+    }
+
     public static void put(Long id, NioSocketChannel socketChannel) {
         CHANNEL_MAP.put(id, socketChannel);
     }