SystemMonitor refactoring: move power state monitor into a separate class called PowerMonitor

base/power_monitor/power_monitor_android.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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/system_monitor/system_monitor.h"
+#include "base/power_monitor/power_monitor.h"
 #include "jni/SystemMonitor_jni.h"

[vandebo (ex-Chrome), 2013/03/19 23:36:04]

SysMon->PowMon

[Hongbo Min, 2013/03/20 13:01:50]

Done.

 
 namespace base {
 
+// A helper function which is a friend of PowerMonitor.
+void ProcessPowerEventHelper(PowerMonitor::PowerEvent event) {
+  if (base::PowerMonitor::Get())
+    base::PowerMonitor::Get()->ProcessPowerEvent(event);
+}
+
 namespace android {
 
 // Native implementation of SystemMonitor.java.
 void OnBatteryChargingChanged(JNIEnv* env, jclass clazz) {
-  SystemMonitor::Get()->ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
+  ProcessPowerEventHelper(PowerMonitor::POWER_STATE_EVENT);
 }
 
 void OnMainActivityResumed(JNIEnv* env, jclass clazz) {
-  SystemMonitor::Get()->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
+  ProcessPowerEventHelper(PowerMonitor::RESUME_EVENT);
 }
 
 void OnMainActivitySuspended(JNIEnv* env, jclass clazz) {
-  SystemMonitor::Get()->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
+  ProcessPowerEventHelper(PowerMonitor::SUSPEND_EVENT);
 }
 
 }  // namespace android
 
-bool SystemMonitor::IsBatteryPower() {
+bool PowerMonitor::IsBatteryPower() {
   JNIEnv* env = base::android::AttachCurrentThread();
   return base::android::Java_SystemMonitor_isBatteryPower(env);
 }
 
+// TODO(hmin): Rename it to RegisterPowerMonitor.

[vandebo (ex-Chrome), 2013/03/19 23:36:04]

Do this in this CL.

[Hongbo Min, 2013/03/20 13:01:50]

Done.

 bool RegisterSystemMonitor(JNIEnv* env) {
   return base::android::RegisterNativesImpl(env);
 }
 
 }  // namespace base