--- /dev/null
+/*******************************************************************************
+################################################################################
+# Copyright (c) [2020-2022] [HCL Technologies Ltd.] #
+# #
+# Licensed under the Apache License, Version 2.0 (the "License"); #
+# you may not use this file except in compliance with the License. #
+# You may obtain a copy of the License at #
+# #
+# http://www.apache.org/licenses/LICENSE-2.0 #
+# #
+# Unless required by applicable law or agreed to in writing, software #
+# distributed under the License is distributed on an "AS IS" BASIS, #
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
+# See the License for the specific language governing permissions and #
+# limitations under the License. #
+################################################################################
+*******************************************************************************/
+
+#ifndef __OBSERVER_HPP__
+#define __OBSERVER_HPP__
+
+#include <stdio.h>
+
+class Subject;
+class Observer
+{
+ public:
+ Observer();
+ ~Observer();
+ virtual void update(char* message);
+ virtual void unsubscribe();
+ virtual void subscribe(Subject *subject);
+
+ protected:
+ char* mMessage;
+ Subject *mSubject;
+};
+
+#endif
+
+/**********************************************************************
+ End of file
+**********************************************************************/