text: /*
   *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #ifndef WEBRTC_VOICE_ENGINE_CHANNEL_MANAGER_BASE_H
  #define WEBRTC_VOICE_ENGINE_CHANNEL_MANAGER_BASE_H
  
  #include "typedefs.h"
  #include "map_wrapper.h"
  #include "voice_engine_defines.h"
  
  namespace webrtc
  {
  class CriticalSectionWrapper;
  class RWLockWrapper;
  
  namespace voe
  {
  
  class ScopedChannel;
  class Channel;
  
  class ChannelManagerBase
  {
  protected:
      bool CreateItem(WebRtc_Word32& itemId);
  
      void InsertItem(WebRtc_Word32 itemId, void* item);
  
      void* RemoveItem(WebRtc_Word32 itemId);
  
      void* GetItem(WebRtc_Word32 itemId) const;
  
      void* GetFirstItem(void*& iterator) const ;
  
      void* GetNextItem(void*& iterator) const;
  
      void ReleaseItem();
  
      void AddFreeItemId(WebRtc_Word32 itemId);
  
      bool GetFreeItemId(WebRtc_Word32& itemId);
  
      void RemoveFreeItemIds();
  
      void DestroyAllItems();
  
      WebRtc_Word32 NumOfItems() const;
  
      WebRtc_Word32 MaxNumOfItems() const;
  
      void GetItemIds(WebRtc_Word32* channelsArray,
                      WebRtc_Word32& numOfChannels) const;
  
      void GetChannels(MapWrapper& channels) const;
  
      virtual void* NewItem(WebRtc_Word32 itemId) = 0;
  
      virtual void DeleteItem(void* item) = 0;
  
      ChannelManagerBase();
  
      virtual ~ChannelManagerBase();
  
  private:
      // Protects _items and _freeItemIds
      CriticalSectionWrapper* _itemsCritSectPtr;
  
      MapWrapper _items;
  
      bool _freeItemIds[kVoiceEngineMaxNumChannels];
  
      // Protects channels from being destroyed while being used
      RWLockWrapper* _itemsRWLockPtr;
  };
  
  } // namespace voe
  
  } // namespace webrtc
  
  #endif  // WEBRTC_VOICE_ENGINE_CHANNEL_MANAGER_BASE_H
  