content/child/power_monitor_broadcast_source.cc

   1 // Copyright (c) 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 #include "content/child/power_monitor_broadcast_source.h"
   6
   7 #include "base/message_loop/message_loop.h"
   8 #include "content/common/power_monitor_messages.h"
   9 #include "ipc/message_filter.h"
  10
  11 namespace content {
  12
  13 class PowerMessageFilter : public IPC::MessageFilter {
  14  public:
  15   PowerMessageFilter(
  16       PowerMonitorBroadcastSource* source,
  17       scoped_refptr<base::MessageLoopProxy> message_loop)
  18       : source_(source),
  19         message_loop_(message_loop) {
  20   }
  21
  22   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
  23     bool handled = true;
  24     IPC_BEGIN_MESSAGE_MAP(PowerMessageFilter, message)
  25       IPC_MESSAGE_HANDLER(PowerMonitorMsg_PowerStateChange, OnPowerStateChange)
  26       IPC_MESSAGE_HANDLER(PowerMonitorMsg_Suspend, OnSuspend)
  27       IPC_MESSAGE_HANDLER(PowerMonitorMsg_Resume, OnResume)
  28       IPC_MESSAGE_UNHANDLED(handled = false)
  29     IPC_END_MESSAGE_MAP()
  30     return handled;
  31   }
  32
  33   void RemoveSource() {
  34     source_ = NULL;
  35   }
  36
  37  private:
  38   friend class base::RefCounted<PowerMessageFilter>;
  39
  40   virtual ~PowerMessageFilter() {};
  41
  42   void OnPowerStateChange(bool on_battery_power) {
  43     message_loop_->PostTask(FROM_HERE,
  44         base::Bind(&PowerMessageFilter::NotifySourcePowerStateChange, this,
  45             on_battery_power));
  46   }
  47   void OnSuspend() {
  48     message_loop_->PostTask(FROM_HERE,
  49         base::Bind(&PowerMessageFilter::NotifySourceSuspend, this));
  50   }
  51   void OnResume() {
  52     message_loop_->PostTask(FROM_HERE,
  53         base::Bind(&PowerMessageFilter::NotifySourceResume, this));
  54   }
  55
  56   void NotifySourcePowerStateChange(bool on_battery_power) {
  57     if (source_)
  58       source_->OnPowerStateChange(on_battery_power);
  59   }
  60   void NotifySourceSuspend() {
  61     if (source_)
  62       source_->OnSuspend();
  63   }
  64   void NotifySourceResume() {
  65      if (source_)
  66       source_->OnResume();
  67   }
  68
  69   // source_ should only be accessed on the thread associated with
  70   // message_loop_.
  71   PowerMonitorBroadcastSource* source_;
  72   scoped_refptr<base::MessageLoopProxy> message_loop_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(PowerMessageFilter);
  75 };
  76
  77 PowerMonitorBroadcastSource::PowerMonitorBroadcastSource()
  78     : last_reported_battery_power_state_(false) {
  79   message_filter_ = new PowerMessageFilter(this,
  80       base::MessageLoopProxy::current());
  81 }
  82
  83 PowerMonitorBroadcastSource::~PowerMonitorBroadcastSource() {
  84   message_filter_->RemoveSource();
  85 }
  86
  87 IPC::MessageFilter* PowerMonitorBroadcastSource::GetMessageFilter() {
  88   return message_filter_.get();
  89 }
  90
  91 bool PowerMonitorBroadcastSource::IsOnBatteryPowerImpl() {
  92   return last_reported_battery_power_state_;
  93 }
  94
  95 void PowerMonitorBroadcastSource::OnPowerStateChange(bool on_battery_power) {
  96   last_reported_battery_power_state_ = on_battery_power;
  97   ProcessPowerEvent(PowerMonitorSource::POWER_STATE_EVENT);
  98 }
  99
 100 void PowerMonitorBroadcastSource::OnSuspend() {
 101   ProcessPowerEvent(PowerMonitorSource::SUSPEND_EVENT);
 102 }
 103
 104 void PowerMonitorBroadcastSource::OnResume() {
 105   ProcessPowerEvent(PowerMonitorSource::RESUME_EVENT);
 106 }
 107
 108 }  // namespace content