content/browser/renderer_host/renderer_frame_manager.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_
   7
   8 #include <list>
   9 #include <map>
  10
  11 #include "base/basictypes.h"
  12 #include "base/memory/singleton.h"
  13 #include "content/common/content_export.h"
  14
  15 namespace content {
  16
  17 class CONTENT_EXPORT RendererFrameManagerClient {
  18  public:
  19   virtual ~RendererFrameManagerClient() {}
  20   virtual void EvictCurrentFrame() = 0;
  21 };
  22
  23 class CONTENT_EXPORT RendererFrameManager {
  24  public:
  25   static RendererFrameManager* GetInstance();
  26
  27   void AddFrame(RendererFrameManagerClient*, bool locked);
  28   void RemoveFrame(RendererFrameManagerClient*);
  29   void LockFrame(RendererFrameManagerClient*);
  30   void UnlockFrame(RendererFrameManagerClient*);
  31
  32   size_t max_number_of_saved_frames() const {
  33     return max_number_of_saved_frames_;
  34   }
  35
  36   // For testing only
  37   void set_max_handles(float max_handles) { max_handles_ = max_handles; }
  38
  39  private:
  40   RendererFrameManager();
  41   ~RendererFrameManager();
  42   void CullUnlockedFrames();
  43
  44   friend struct DefaultSingletonTraits<RendererFrameManager>;
  45
  46   std::map<RendererFrameManagerClient*, size_t> locked_frames_;
  47   std::list<RendererFrameManagerClient*> unlocked_frames_;
  48   size_t max_number_of_saved_frames_;
  49   float max_handles_;
  50
  51   DISALLOW_COPY_AND_ASSIGN(RendererFrameManager);
  52 };
  53
  54 }  // namespace content
  55
  56 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_