athena/resource_manager/public/resource_manager.h

   1 // Copyright 2014 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 ATHENA_RESOURCE_MANAGER_PUBLIC_RESOURCE_MANAGER_H_
   6 #define ATHENA_RESOURCE_MANAGER_PUBLIC_RESOURCE_MANAGER_H_
   7
   8 #include "athena/resource_manager/memory_pressure_notifier.h"
   9 #include "base/basictypes.h"
  10
  11 namespace athena {
  12
  13 // The resource manager is monitoring activity changes, low memory conditions
  14 // and other events to control the activity state (pre-/un-/re-/loading them)
  15 // to keep enough memory free that no jank/lag will show when new applications
  16 // are loaded and / or a navigation between applications takes place.
  17 class ResourceManager {
  18  public:
  19   // Creates the instance handling the resources.
  20   static void Create();
  21   static ResourceManager* Get();
  22   static void Shutdown();
  23
  24   ResourceManager();
  25   virtual ~ResourceManager();
  26
  27   // Unit tests can simulate MemoryPressure changes with this call.
  28   // Note: Even though the default unit test ResourceManagerDelegte
  29   // implementation ensures that the MemoryPressure event will not go off,
  30   // this call will also explicitly stop the MemoryPressureNotifier.
  31   virtual void SetMemoryPressureAndStopMonitoring(
  32       MemoryPressureObserver::MemoryPressure pressure) = 0;
  33
  34  private:
  35   DISALLOW_COPY_AND_ASSIGN(ResourceManager);
  36 };
  37
  38 }  // namespace athena
  39
  40 #endif  // ATHENA_RESOURCE_MANAGER_PUBLIC_RESOURCE_MANAGER_H_