content/browser/background_sync/background_sync_power_observer.h

   1 // Copyright 2015 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_BACKGROUND_SYNC_BACKGROUND_SYNC_POWER_OBSERVER_H_
   6 #define CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_POWER_OBSERVER_H_
   7
   8 #include "base/bind.h"
   9 #include "base/power_monitor/power_observer.h"
  10 #include "content/browser/background_sync/background_sync.pb.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace content {
  14
  15 // BackgroundSyncPowerObserver monitors the charging status of the device and
  16 // determines if the power conditions of BackgroundSyncRegistrations are met.
  17 class CONTENT_EXPORT BackgroundSyncPowerObserver : public base::PowerObserver {
  18  public:
  19   // Creates a BackgroundSyncPowerObserver. |power_callback| is run when the
  20   // battery states changes asynchronously via PostMessage.
  21   explicit BackgroundSyncPowerObserver(const base::Closure& power_callback);
  22
  23   ~BackgroundSyncPowerObserver() override;
  24
  25   // Returns true if the state of the battery (charging or not) meets the needs
  26   // of |power_state|.
  27   bool PowerSufficient(SyncPowerState power_state) const;
  28
  29  private:
  30   friend class BackgroundSyncPowerObserverTest;
  31
  32   // PowerObserver overrides
  33   void OnPowerStateChange(bool on_battery_power) override;
  34
  35   // |observing_power_monitor_| is true when the constructor is able to find and
  36   // register an observer with the base::PowerMonitor. This should always be
  37   // true except for tests in which the browser initialization isn't done.
  38   bool observing_power_monitor_;
  39
  40   bool on_battery_;
  41
  42   // The callback to run when the battery state changes.
  43   base::Closure power_changed_callback_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncPowerObserver);
  46 };
  47
  48 }  // namespace content
  49
  50 #endif  // CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_POWER_OBSERVER_H_