Delete athena/

athena/resource_manager/memory_pressure_notifier.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ATHENA_RESOURCE_MANAGER_MEMORY_PRESSURE_NOTIFIER_H_
-#define ATHENA_RESOURCE_MANAGER_MEMORY_PRESSURE_NOTIFIER_H_
-
-#include "athena/athena_export.h"
-#include "athena/resource_manager/public/resource_manager.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/timer/timer.h"
-
-namespace athena {
-
-class MemoryPressureNotifierImpl;
-class ResourceManagerDelegate;
-
-////////////////////////////////////////////////////////////////////////////////
-// MemoryPressureObserver
-//
-// This observer gets informed once about a |MEMORY_PRESSURE_LOW|. When the
-// pressure exceeds, the observer will get polled until |MEMORY_PRESSURE_LOW| is
-// reached again to counter memory consumption.
-class MemoryPressureObserver {
- public:
-  MemoryPressureObserver() {}
-  virtual ~MemoryPressureObserver() {}
-
-  // The observer.
-  virtual void OnMemoryPressure(ResourceManager::MemoryPressure pressure) = 0;
-
-  // OS system interface functions. The delegate remains owned by the Observer.
-  virtual ResourceManagerDelegate* GetDelegate() = 0;
-};
-
-
-////////////////////////////////////////////////////////////////////////////////
-// MemoryPressureNotifier
-//
-// Class to handle the observation of our free memory. It notifies the owner of
-// memory fill level changes, so that it can take action to reduce memory by
-// reducing active activities.
-//
-// The observer will use 3 different fill levels: 50% full, 75% full and 90%
-// full.
-class ATHENA_EXPORT MemoryPressureNotifier {
- public:
-  // The creator gets the |listener| object. Note that the ownership of the
-  // listener object remains with the creator.
-  explicit MemoryPressureNotifier(MemoryPressureObserver* listener);
-  ~MemoryPressureNotifier();
-
-  // Stop observing the memory fill level.
-  // May be safely called if StartObserving has not been called.
-  void StopObserving();
-
- private:
-  // Starts observing the memory fill level.
-  // Calls to StartObserving should always be matched with calls to
-  // StopObserving.
-  void StartObserving();
-
-  // The function which gets periodically be called to check any changes in the
-  // memory pressure.
-  void CheckMemoryPressure();
-
-  // Converts free percent of memory into a memory pressure value.
-  ResourceManager::MemoryPressure GetMemoryPressureLevelFromFillLevel(
-      int memory_fill_level);
-
-  base::RepeatingTimer<MemoryPressureNotifier> timer_;
-
-  // The listener which needs to be informed about memory pressure.
-  MemoryPressureObserver* listener_;
-
-  // Our current memory pressure.
-  ResourceManager::MemoryPressure current_pressure_;
-
-  DISALLOW_COPY_AND_ASSIGN(MemoryPressureNotifier);
-};
-
-}  // namespace athena
-
-#endif  // ATHENA_RESOURCE_MANAGER_MEMORY_PRESSURE_NOTIFIER_H_