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diff --git a/gps/core/observer/IOsObserver.h b/gps/core/observer/IOsObserver.h
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+/* Copyright (c) 2017, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __IOSOBSERVER_H__
+#define __IOSOBSERVER_H__
+
+#include  <list>
+#include <string>
+#include <IDataItemObserver.h>
+#include <IDataItemSubscription.h>
+#include <IFrameworkActionReq.h>
+
+using namespace std;
+
+namespace loc_core
+{
+
+/**
+ * @brief IOsObserver interface
+ * @details IOsObserver interface;
+ *          In OS dependent code this type serves as a handle to
+ *          an OS independent instance of this interface.
+ */
+class IOsObserver :
+                public IDataItemObserver,
+                public IDataItemSubscription,
+                public IFrameworkActionReq {
+
+public:
+
+    // To set the subscription object
+    virtual void setSubscriptionObj(IDataItemSubscription *subscriptionObj) = 0;
+
+    // To set the framework action request object
+    virtual void setFrameworkActionReqObj(IFrameworkActionReq *frameworkActionReqObj) = 0;
+
+    // IDataItemObserver Overrides
+    inline virtual void getName (string & /*name*/) {}
+    inline virtual void notify (const std::list <IDataItemCore *> & /*dlist*/) {}
+
+    // IDataItemSubscription Overrides
+    inline virtual void subscribe
+    (
+        const std :: list <DataItemId> & /*l*/,
+        IDataItemObserver * /*client*/
+    ){}
+    inline virtual void updateSubscription
+    (
+        const std :: list <DataItemId> & /*l*/,
+        IDataItemObserver * /*client*/
+    ){}
+    inline virtual void requestData
+    (
+        const std :: list <DataItemId> & /*l*/,
+        IDataItemObserver * /*client*/
+    ){}
+    inline virtual void unsubscribe
+    (
+        const std :: list <DataItemId> & /*l*/,
+        IDataItemObserver * /*client*/
+    ){}
+    inline virtual void unsubscribeAll (IDataItemObserver * /*client*/){}
+
+    // IFrameworkActionReq Overrides
+    inline virtual void turnOn (DataItemId /*dit*/, int /*timeOut*/){}
+    inline virtual void turnOff (DataItemId /*dit*/) {}
+#ifdef USE_GLIB
+    inline virtual bool connectBackhaul(const string& clientName) { return false; }
+    inline virtual bool disconnectBackhaul(const string& clientName) { return false; }
+#endif
+
+    /**
+     * @brief Destructor
+     * @details Destructor
+     */
+    virtual ~IOsObserver () {}
+};
+
+} // namespace loc_core
+
+#endif // #ifndef __IOSOBSERVER_H__