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diff --git a/src/o1/O1App.cpp b/src/o1/O1App.cpp
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+/*******************************************************************************
+################################################################################
+#   Copyright (c) [2020-2021] [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.                                             #
+################################################################################
+*******************************************************************************/
+
+/* This file contains the O1App class which is responsible for running/starting
+   all the O1 modules in a thread. It inherits the Thread class and Singleton
+   class.
+*/
+
+#include "O1App.hpp"
+#include "GlobalDefs.hpp"
+#include "SessionHandler.hpp"
+#include "ConfigInterface.h"
+#include <unistd.h>
+
+/*******************************************************************
+ *
+ * @brief Constructor
+ *
+ * @details
+ *
+ *    Function : O1App
+ *
+ *    Functionality:
+ *      - Constructor intialization
+ *
+ * @params[in] None
+ * @return None
+ ******************************************************************/
+
+O1App::O1App() : mUxSocketServer(O1::ALARM_SOCK_PATH)
+{
+
+}
+
+/*******************************************************************
+ *
+ * @brief Destructor
+ *
+ * @details
+ *
+ *    Function : ~O1App
+ *
+ *    Functionality:
+ *      - Destructor
+ *
+ * @params[in] None
+ * @return None
+ ******************************************************************/
+
+O1App::~O1App()
+{
+
+}
+
+/*******************************************************************
+ *
+ * @brief Runs the O1 modules as a thread 
+ *
+ * @details
+ *
+ *    Function : run
+ *
+ *    Functionality:
+ *      - Implements the "run" function of Thread class.
+ *        Starts all the O1 modules.
+ *
+ *
+ * @params[in] void
+ * @return true  : success
+ *         false : failure
+ ******************************************************************/
+
+bool O1App::run()
+{
+    
+   SessionHandler sessHdlr;
+   /* Start Netconf session and subscribe to yang modules */
+   try
+   {
+      if( !sessHdlr.init() )
+      {
+         O1_LOG("\nO1 O1App : SessionHandler initialization failed ");         
+         return false;
+      }
+   }
+   catch( const std::exception& e ) 
+   {
+      O1_LOG("\nO1 O1App : Exception : %s", e.what());
+      return false;
+   }
+   
+   /* Start the Unix Socket Server to listen for alarm messages */
+   if( mUxSocketServer.start() )
+   {  
+      
+      if(mUxSocketServer.setAffinity(O1::CPU_CORE))
+      {
+         O1_LOG("\nO1 O1App : CPU affinity set " );
+         mUxSocketServer.printAffinity();
+      }
+      
+      sleep(2);
+      if( mUxSocketServer.isRunning() )  
+      {
+         mStartupStatus = true;
+         O1_LOG("\nO1 O1App : Unix Socket server started\n");
+      }
+      else
+      {
+         O1_LOG("\nO1 O1App : Unix Socket server failed to start\n");
+         return false;
+      }
+      /* Wait for the Unix Socket Server thread to end*/
+      mUxSocketServer.join();
+   }
+   else
+   {
+      O1_LOG("\nO1 O1App : Unix Socket server failed to start\n");
+      return false;
+   }
+   return true;
+}
+
+/*******************************************************************
+ *
+ * @brief Check if the O1 Module is fully up and running
+ *
+ * @details
+ *
+ *    Function : getStartupStatus
+ *
+ *    Functionality:
+ *      - Returns the status of O1App whether it is fully up
+ *
+ *
+ * @params[in] void
+ * @return true  : started
+ *         false : not started
+ ******************************************************************/
+
+bool O1App::getStartupStatus() const
+{
+   return mStartupStatus;
+}
+
+/*******************************************************************
+ *
+ * @brief Cleanup O1App
+ *
+ * @details
+ *
+ *    Function : cleanUp
+ *
+ *    Functionality:
+ *      - Implements the "cleanUp" function of Thread class to
+ *        take care of any clean up required for O1 components 
+ *        before stopping the thread.
+ *
+ * @params[in] void
+ * @return void
+ ******************************************************************/
+
+void O1App::cleanUp(void)
+{
+   /* Stop the socket server thread */
+   mUxSocketServer.stop();   
+}