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libs/hwcodec/externals/AMF_v1.4.35/amf/public/common/ObservableImpl.h

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+// 
+// Notice Regarding Standards.  AMD does not provide a license or sublicense to
+// any Intellectual Property Rights relating to any standards, including but not
+// limited to any audio and/or video codec technologies such as MPEG-2, MPEG-4;
+// AVC/H.264; HEVC/H.265; AAC decode/FFMPEG; AAC encode/FFMPEG; VC-1; and MP3
+// (collectively, the "Media Technologies"). For clarity, you will pay any
+// royalties due for such third party technologies, which may include the Media
+// Technologies that are owed as a result of AMD providing the Software to you.
+// 
+// MIT license 
+// 
+// Copyright (c) 2018 Advanced Micro Devices, Inc. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+/**
+ ***************************************************************************************************
+ * @file  ObservableImpl.h
+ * @brief AMFObservableImpl common template declaration
+ ***************************************************************************************************
+ */
+#ifndef AMF_ObservableImpl_h
+#define AMF_ObservableImpl_h
+#pragma once
+
+#include "Thread.h"
+#include <list>
+
+namespace amf
+{
+    template<typename Observer>
+    class AMFObservableImpl
+    {
+    private:
+        typedef std::list<Observer*> ObserversList;
+        ObserversList m_observers;
+    public:
+        AMFObservableImpl() : m_observers()
+        {}
+        virtual ~AMFObservableImpl()
+        {
+            assert(m_observers.size() == 0);
+        }
+        virtual void AMF_STD_CALL AddObserver(Observer* pObserver)
+        {
+            if (pObserver == nullptr)
+            {
+                return;
+            }
+
+            amf_bool found = false;
+            AMFLock lock(&m_sc);
+            
+            for (typename ObserversList::iterator it = m_observers.begin(); it != m_observers.end(); it++)
+            {
+                if (*it == pObserver)
+                {
+                    found = true;
+                    break;
+                }
+            }
+            if (found == false)
+            {
+                m_observers.push_back(pObserver);
+            }
+        }
+
+        virtual void AMF_STD_CALL RemoveObserver(Observer* pObserver)
+        {
+            AMFLock lock(&m_sc);
+            m_observers.remove(pObserver);
+        }
+
+    protected:
+        void AMF_STD_CALL ClearObservers()
+        {
+            AMFLock lock(&m_sc);
+            m_observers.clear();
+        }
+
+        void AMF_STD_CALL NotifyObservers(void  (AMF_STD_CALL Observer::* pEvent)())
+        {
+            ObserversList tempList;
+            {
+                AMFLock lock(&m_sc);
+                tempList = m_observers;
+            }
+            for (typename ObserversList::iterator it = tempList.begin(); it != tempList.end(); ++it)
+            {
+                Observer* pObserver = *it;
+                (pObserver->*pEvent)();
+            }
+        }
+
+        template<typename TArg0>
+        void AMF_STD_CALL NotifyObservers(void (AMF_STD_CALL Observer::* pEvent)(TArg0), TArg0 arg0)
+        {
+            ObserversList tempList;
+            {
+                AMFLock lock(&m_sc);
+                tempList = m_observers;
+            }
+            for (typename ObserversList::iterator it = tempList.begin(); it != tempList.end(); ++it)
+            {
+                Observer* pObserver = *it;
+                (pObserver->*pEvent)(arg0);
+            }
+        }
+        template<typename TArg0, typename TArg1>
+        void AMF_STD_CALL NotifyObservers(void (AMF_STD_CALL Observer::* pEvent)(TArg0, TArg1), TArg0 arg0, TArg1 arg1)
+        {
+            ObserversList tempList;
+            {
+                AMFLock lock(&m_sc);
+                tempList = m_observers;
+            }
+            for (typename ObserversList::iterator it = tempList.begin(); it != tempList.end(); it++)
+            {
+                Observer* pObserver = *it;
+                (pObserver->*pEvent)(arg0, arg1);
+            }
+        }
+    private:
+        AMFCriticalSection m_sc;
+    };
+}
+#endif //AMF_ObservableImpl_h