Created multi-process-friendly PowerMonitor interface.

base/power_monitor/power_monitor_device_source_win.cc

 // Copyright 2013 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.
 
 #include "base/power_monitor/power_monitor.h"
-
+#include "base/power_monitor/power_monitor_device_source.h"
 #include "base/win/wrapped_window_proc.h"
 
 namespace base {
 
+void ProcessPowerEventHelper(PowerMonitorSource::PowerEvent event) {
+  DCHECK(PowerMonitor::Get());
+  if (PowerMonitor::Get())
+    PowerMonitor::Get()->Source()->ProcessPowerEvent(event);
+}
+
 namespace {
 
 const wchar_t kWindowClassName[] = L"Base_PowerMessageWindow";
 
 }  // namespace
 
 // Function to query the system to see if it is currently running on
 // battery power.  Returns true if running on battery.
-bool PowerMonitor::IsBatteryPower() {
+bool PowerMonitorDeviceSource::IsBatteryPower() {
   SYSTEM_POWER_STATUS status;
   if (!GetSystemPowerStatus(&status)) {
     DLOG_GETLASTERROR(ERROR) << "GetSystemPowerStatus failed";
     return false;
   }
   return (status.ACLineStatus == 0);
 }
 
-PowerMonitor::PowerMessageWindow::PowerMessageWindow()
+PowerMonitorDeviceSource::PowerMessageWindow::PowerMessageWindow()
     : instance_(NULL), message_hwnd_(NULL) {
   if (MessageLoop::current()->type() != MessageLoop::TYPE_UI) {
     // Creating this window in (e.g.) a renderer inhibits shutdown on Windows.
     // See http://crbug.com/230122. TODO(vandebo): http://crbug.com/236031
     DLOG(ERROR)
         << "Cannot create windows on non-UI thread, power monitor disabled!";
     return;
   }
   WNDCLASSEX window_class;
   base::win::InitializeWindowClass(
       kWindowClassName,
       &base::win::WrappedWindowProc<
-          PowerMonitor::PowerMessageWindow::WndProcThunk>,
+          PowerMonitorDeviceSource::PowerMessageWindow::WndProcThunk>,
       0, 0, 0, NULL, NULL, NULL, NULL, NULL,
       &window_class);
   instance_ = window_class.hInstance;
   ATOM clazz = RegisterClassEx(&window_class);
   DCHECK(clazz);
 
   message_hwnd_ = CreateWindowEx(WS_EX_NOACTIVATE, kWindowClassName,
       NULL, WS_POPUP, 0, 0, 0, 0, NULL, NULL, instance_, NULL);
   SetWindowLongPtr(message_hwnd_, GWLP_USERDATA,
                    reinterpret_cast<LONG_PTR>(this));
 }
 
-PowerMonitor::PowerMessageWindow::~PowerMessageWindow() {
+PowerMonitorDeviceSource::PowerMessageWindow::~PowerMessageWindow() {
   if (message_hwnd_) {
     DestroyWindow(message_hwnd_);
     UnregisterClass(kWindowClassName, instance_);
   }
 }
 
-void PowerMonitor::PowerMessageWindow::ProcessWmPowerBroadcastMessage(
+void
+PowerMonitorDeviceSource::PowerMessageWindow::ProcessWmPowerBroadcastMessage(
     int event_id) {
-  PowerMonitor::PowerEvent power_event;
+  PowerMonitorSource::PowerEvent power_event;
   switch (event_id) {
     case PBT_APMPOWERSTATUSCHANGE:  // The power status changed.
-      power_event = PowerMonitor::POWER_STATE_EVENT;
+      power_event = PowerMonitorSource::POWER_STATE_EVENT;
       break;
     case PBT_APMRESUMEAUTOMATIC:  // Resume from suspend.
     //case PBT_APMRESUMESUSPEND:  // User-initiated resume from suspend.
                                   // We don't notify for this latter event
                                   // because if it occurs it is always sent as a
                                   // second event after PBT_APMRESUMEAUTOMATIC.
-      power_event = PowerMonitor::RESUME_EVENT;
+      power_event = PowerMonitorSource::RESUME_EVENT;
       break;
     case PBT_APMSUSPEND:  // System has been suspended.
-      power_event = PowerMonitor::SUSPEND_EVENT;
+      power_event = PowerMonitorSource::SUSPEND_EVENT;
       break;
     default:
       return;
 
     // Other Power Events:
     // PBT_APMBATTERYLOW - removed in Vista.
     // PBT_APMOEMEVENT - removed in Vista.
     // PBT_APMQUERYSUSPEND - removed in Vista.
     // PBT_APMQUERYSUSPENDFAILED - removed in Vista.
     // PBT_APMRESUMECRITICAL - removed in Vista.
     // PBT_POWERSETTINGCHANGE - user changed the power settings.
   }
 
-  PowerMonitor::Get()->ProcessPowerEvent(power_event);
+  ProcessPowerEventHelper(power_event);
 }
 
-LRESULT CALLBACK PowerMonitor::PowerMessageWindow::WndProc(
+LRESULT CALLBACK PowerMonitorDeviceSource::PowerMessageWindow::WndProc(
     HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
   switch (message) {
     case WM_POWERBROADCAST: {
       DWORD power_event = static_cast<DWORD>(message);
       ProcessWmPowerBroadcastMessage(power_event);
       return TRUE;
     }
     default:
       break;
   }
   return ::DefWindowProc(hwnd, message, wparam, lparam);
 }
 
 // static
-LRESULT CALLBACK PowerMonitor::PowerMessageWindow::WndProcThunk(
+LRESULT CALLBACK PowerMonitorDeviceSource::PowerMessageWindow::WndProcThunk(
     HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
-  PowerMonitor::PowerMessageWindow* message_hwnd =
-      reinterpret_cast<PowerMonitor::PowerMessageWindow*>(
+  PowerMonitorDeviceSource::PowerMessageWindow* message_hwnd =
+      reinterpret_cast<PowerMonitorDeviceSource::PowerMessageWindow*>(
           GetWindowLongPtr(hwnd, GWLP_USERDATA));
   if (message_hwnd)
     return message_hwnd->WndProc(hwnd, message, wparam, lparam);
   return ::DefWindowProc(hwnd, message, wparam, lparam);
 }
 
 }  // namespace base