device/battery/battery_monitor_impl.cc

   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 #include "device/battery/battery_monitor_impl.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9
  10 namespace device {
  11
  12 // static
  13 void BatteryMonitorImpl::Create(
  14     mojo::InterfaceRequest<BatteryMonitor> request) {
  15   new BatteryMonitorImpl(request.Pass());
  16 }
  17
  18 BatteryMonitorImpl::BatteryMonitorImpl(
  19     mojo::InterfaceRequest<BatteryMonitor> request)
  20     : binding_(this, request.Pass()),
  21       status_to_report_(false) {
  22   // NOTE: DidChange may be called before AddCallback returns. This is done to
  23   // report current status.
  24   subscription_ = BatteryStatusService::GetInstance()->AddCallback(
  25       base::Bind(&BatteryMonitorImpl::DidChange, base::Unretained(this)));
  26 }
  27
  28 BatteryMonitorImpl::~BatteryMonitorImpl() {
  29 }
  30
  31 void BatteryMonitorImpl::QueryNextStatus(
  32     const BatteryStatusCallback& callback) {
  33   if (!callback_.is_null()) {
  34     DVLOG(1) << "Overlapped call to QueryNextStatus!";
  35     delete this;
  36     return;
  37   }
  38   callback_ = callback;
  39
  40   if (status_to_report_)
  41     ReportStatus();
  42 }
  43
  44 void BatteryMonitorImpl::RegisterSubscription() {
  45 }
  46
  47 void BatteryMonitorImpl::DidChange(const BatteryStatus& battery_status) {
  48   status_ = battery_status;
  49   status_to_report_ = true;
  50
  51   if (!callback_.is_null())
  52     ReportStatus();
  53 }
  54
  55 void BatteryMonitorImpl::ReportStatus() {
  56   callback_.Run(status_.Clone());
  57   callback_.reset();
  58
  59   status_to_report_ = false;
  60 }
  61
  62 }  // namespace device