services/java/com/android/server/IdleMaintenanceService.java - LeafOS-Project/android_frameworks_base - Gitiles

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.server;

 import android.app.Activity;
 import android.app.ActivityManagerNative;
 import android.app.AlarmManager;
 import android.app.PendingIntent;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Handler;
 import android.os.PowerManager;
 import android.os.PowerManager.WakeLock;
 import android.os.RemoteException;
 import android.os.SystemClock;
 import android.os.UserHandle;
 import android.util.Log;
 import android.util.Slog;

 /**
  * This service observes the device state and when applicable sends
  * broadcasts at the beginning and at the end of a period during which
  * observers can perform idle maintenance tasks. Typical use of the
  * idle maintenance is to perform somehow expensive tasks that can be
  * postponed to a moment when they will not degrade user experience.
  *
  * The current implementation is very simple. The start of a maintenance
  * window is announced if: the screen is off or showing a dream AND the
  * battery level is more than twenty percent AND at least one hour passed
  * activity).
  *
  * The end of a maintenance window is announced only if: a start was
  * announced AND the screen turned on or a dream was stopped.
  */
 public class IdleMaintenanceService extends BroadcastReceiver {

     private static final boolean DEBUG = false;

     private static final String LOG_TAG = IdleMaintenanceService.class.getSimpleName();

     private static final int LAST_USER_ACTIVITY_TIME_INVALID = -1;

     private static final long MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS = 24 * 60 * 60 * 1000; // 1 day

     private static final int MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_CHARGING = 30; // percent

     private static final int MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_NOT_CHARGING = 80; // percent

     private static final int MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_RUNNING = 20; // percent

     private static final long MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START = 71 * 60 * 1000; // 71 min

     private static final long MAX_IDLE_MAINTENANCE_DURATION = 71 * 60 * 1000; // 71 min

     private static final String ACTION_UPDATE_IDLE_MAINTENANCE_STATE =
         "com.android.server.IdleMaintenanceService.action.UPDATE_IDLE_MAINTENANCE_STATE";

     private static final String ACTION_FORCE_IDLE_MAINTENANCE =
         "com.android.server.IdleMaintenanceService.action.FORCE_IDLE_MAINTENANCE";

     private static final Intent sIdleMaintenanceStartIntent;
     static {
         sIdleMaintenanceStartIntent = new Intent(Intent.ACTION_IDLE_MAINTENANCE_START);
         sIdleMaintenanceStartIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
     };

     private static final Intent sIdleMaintenanceEndIntent;
     static {
         sIdleMaintenanceEndIntent = new Intent(Intent.ACTION_IDLE_MAINTENANCE_END);
         sIdleMaintenanceEndIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
     }

     private final AlarmManager mAlarmService;

     private final BatteryService mBatteryService;

     private final PendingIntent mUpdateIdleMaintenanceStatePendingIntent;

     private final Context mContext;

     private final WakeLock mWakeLock;

     private final Handler mHandler;

     private long mLastIdleMaintenanceStartTimeMillis;

     private long mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID;

     private boolean mIdleMaintenanceStarted;

     public IdleMaintenanceService(Context context, BatteryService batteryService) {
         mContext = context;
         mBatteryService = batteryService;

         mAlarmService = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

         PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
         mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, LOG_TAG);

         mHandler = new Handler(mContext.getMainLooper());

         Intent intent = new Intent(ACTION_UPDATE_IDLE_MAINTENANCE_STATE);
         intent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
         mUpdateIdleMaintenanceStatePendingIntent = PendingIntent.getBroadcast(mContext, 0,
                 intent, PendingIntent.FLAG_UPDATE_CURRENT);

         register(mHandler);
     }

     public void register(Handler handler) {
         IntentFilter intentFilter = new IntentFilter();

         // Alarm actions.
         intentFilter.addAction(ACTION_UPDATE_IDLE_MAINTENANCE_STATE);

         // Battery actions.
         intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);

         // Screen actions.
         intentFilter.addAction(Intent.ACTION_SCREEN_ON);
         intentFilter.addAction(Intent.ACTION_SCREEN_OFF);

         // Dream actions.
         intentFilter.addAction(Intent.ACTION_DREAMING_STARTED);
         intentFilter.addAction(Intent.ACTION_DREAMING_STOPPED);

         mContext.registerReceiverAsUser(this, UserHandle.ALL,
                 intentFilter, null, mHandler);

         intentFilter = new IntentFilter();
         intentFilter.addAction(ACTION_FORCE_IDLE_MAINTENANCE);
         mContext.registerReceiverAsUser(this, UserHandle.ALL,
                 intentFilter, android.Manifest.permission.SET_ACTIVITY_WATCHER, mHandler);
     }

     private void scheduleUpdateIdleMaintenanceState(long delayMillis) {
         final long triggetRealTimeMillis = SystemClock.elapsedRealtime() + delayMillis;
         mAlarmService.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggetRealTimeMillis,
                 mUpdateIdleMaintenanceStatePendingIntent);
     }

     private void unscheduleUpdateIdleMaintenanceState() {
         mAlarmService.cancel(mUpdateIdleMaintenanceStatePendingIntent);
     }

     private void updateIdleMaintenanceState(boolean noisy) {
         if (mIdleMaintenanceStarted) {
             // Idle maintenance can be interrupted by user activity, or duration
             // time out, or low battery.
             if (!lastUserActivityPermitsIdleMaintenanceRunning()
                     || !batteryLevelAndMaintenanceTimeoutPermitsIdleMaintenanceRunning()) {
                 unscheduleUpdateIdleMaintenanceState();
                 mIdleMaintenanceStarted = false;
                 EventLogTags.writeIdleMaintenanceWindowFinish(SystemClock.elapsedRealtime(),
                         mLastUserActivityElapsedTimeMillis, mBatteryService.getBatteryLevel(),
                         isBatteryCharging() ? 1 : 0);
                 sendIdleMaintenanceEndIntent();
                 // We stopped since we don't have enough battery or timed out but the
                 // user is not using the device, so we should be able to run maintenance
                 // in the next maintenance window since the battery may be charged
                 // without interaction and the min interval between maintenances passed.
                 if (!batteryLevelAndMaintenanceTimeoutPermitsIdleMaintenanceRunning()) {
                     scheduleUpdateIdleMaintenanceState(
                             getNextIdleMaintenanceIntervalStartFromNow());
                 }
             }
         } else if (deviceStatePermitsIdleMaintenanceStart(noisy)
                 && lastUserActivityPermitsIdleMaintenanceStart(noisy)
                 && lastRunPermitsIdleMaintenanceStart(noisy)) {
             // Now that we started idle maintenance, we should schedule another
             // update for the moment when the idle maintenance times out.
             scheduleUpdateIdleMaintenanceState(MAX_IDLE_MAINTENANCE_DURATION);
             mIdleMaintenanceStarted = true;
             EventLogTags.writeIdleMaintenanceWindowStart(SystemClock.elapsedRealtime(),
                     mLastUserActivityElapsedTimeMillis, mBatteryService.getBatteryLevel(),
                     isBatteryCharging() ? 1 : 0);
             mLastIdleMaintenanceStartTimeMillis = SystemClock.elapsedRealtime();
             sendIdleMaintenanceStartIntent();
         } else if (lastUserActivityPermitsIdleMaintenanceStart(noisy)) {
              if (lastRunPermitsIdleMaintenanceStart(noisy)) {
                 // The user does not use the device and we did not run maintenance in more
                 // than the min interval between runs, so schedule an update - maybe the
                 // battery will be charged latter.
                 scheduleUpdateIdleMaintenanceState(MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START);
              } else {
                  // The user does not use the device but we have run maintenance in the min
                  // interval between runs, so schedule an update after the min interval ends.
                  scheduleUpdateIdleMaintenanceState(
                          getNextIdleMaintenanceIntervalStartFromNow());
              }
         }
     }

     private long getNextIdleMaintenanceIntervalStartFromNow() {
         return mLastIdleMaintenanceStartTimeMillis + MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS
                 - SystemClock.elapsedRealtime();
     }

     private void sendIdleMaintenanceStartIntent() {
         mWakeLock.acquire();
         try {
             ActivityManagerNative.getDefault().performIdleMaintenance();
         } catch (RemoteException e) {
         }
         mContext.sendOrderedBroadcastAsUser(sIdleMaintenanceStartIntent, UserHandle.ALL,
                 null, this, mHandler, Activity.RESULT_OK, null, null);
     }

     private void sendIdleMaintenanceEndIntent() {
         mWakeLock.acquire();
         mContext.sendOrderedBroadcastAsUser(sIdleMaintenanceEndIntent, UserHandle.ALL,
                 null, this, mHandler, Activity.RESULT_OK, null, null);
     }

     private boolean deviceStatePermitsIdleMaintenanceStart(boolean noisy) {
         final int minBatteryLevel = isBatteryCharging()
                 ? MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_CHARGING
                 : MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_NOT_CHARGING;
         boolean allowed = (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID
                 && mBatteryService.getBatteryLevel() > minBatteryLevel);
         if (!allowed && noisy) {
             Slog.i("IdleMaintenance", "Idle maintenance not allowed due to power");
         }
         return allowed;
     }

     private boolean lastUserActivityPermitsIdleMaintenanceStart(boolean noisy) {
         // The last time the user poked the device is above the threshold.
         boolean allowed = (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID
                 && SystemClock.elapsedRealtime() - mLastUserActivityElapsedTimeMillis
                     > MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START);
         if (!allowed && noisy) {
             Slog.i("IdleMaintenance", "Idle maintenance not allowed due to last user activity");
         }
         return allowed;
     }

     private boolean lastRunPermitsIdleMaintenanceStart(boolean noisy) {
         // Enough time passed since the last maintenance run.
         boolean allowed = SystemClock.elapsedRealtime() - mLastIdleMaintenanceStartTimeMillis
                 > MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS;
         if (!allowed && noisy) {
             Slog.i("IdleMaintenance", "Idle maintenance not allowed due time since last");
         }
         return allowed;
     }

     private boolean lastUserActivityPermitsIdleMaintenanceRunning() {
         // The user is not using the device.
         return (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID);
     }

     private boolean batteryLevelAndMaintenanceTimeoutPermitsIdleMaintenanceRunning() {
         // Battery not too low and the maintenance duration did not timeout.
         return (mBatteryService.getBatteryLevel() > MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_RUNNING
                 && mLastIdleMaintenanceStartTimeMillis + MAX_IDLE_MAINTENANCE_DURATION
                         > SystemClock.elapsedRealtime());
     }

     private boolean isBatteryCharging() {
         return mBatteryService.getPlugType() > 0
                 && mBatteryService.getInvalidCharger() == 0;
     }

     @Override
     public void onReceive(Context context, Intent intent) {
         if (DEBUG) {
             Log.i(LOG_TAG, intent.getAction());
         }
         String action = intent.getAction();
         if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
             // We care about battery only if maintenance is in progress so we can
             // stop it if battery is too low. Note that here we assume that the
             // maintenance clients are properly holding a wake lock. We will
             // refactor the maintenance to use services instead of intents for the
             // next release. The only client for this for now is internal an holds
             // a wake lock correctly.
             if (mIdleMaintenanceStarted) {
                 updateIdleMaintenanceState(false);
             }
         } else if (Intent.ACTION_SCREEN_ON.equals(action)
                 || Intent.ACTION_DREAMING_STOPPED.equals(action)) {
             mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID;
             // Unschedule any future updates since we already know that maintenance
             // cannot be performed since the user is back.
             unscheduleUpdateIdleMaintenanceState();
             // If the screen went on/stopped dreaming, we know the user is using the
             // device which means that idle maintenance should be stopped if running.
             updateIdleMaintenanceState(false);
         } else if (Intent.ACTION_SCREEN_OFF.equals(action)
                 || Intent.ACTION_DREAMING_STARTED.equals(action)) {
             mLastUserActivityElapsedTimeMillis = SystemClock.elapsedRealtime();
             // If screen went off/started dreaming, we may be able to start idle maintenance
             // after the minimal user inactivity elapses. We schedule an alarm for when
             // this timeout elapses since the device may go to sleep by then.
             scheduleUpdateIdleMaintenanceState(MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START);
         } else if (ACTION_UPDATE_IDLE_MAINTENANCE_STATE.equals(action)) {
             updateIdleMaintenanceState(false);
         } else if (ACTION_FORCE_IDLE_MAINTENANCE.equals(action)) {
             long now = SystemClock.elapsedRealtime() - 1;
             mLastUserActivityElapsedTimeMillis = now - MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START;
             mLastIdleMaintenanceStartTimeMillis = now - MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS;
             updateIdleMaintenanceState(true);
         } else if (Intent.ACTION_IDLE_MAINTENANCE_START.equals(action)
                 || Intent.ACTION_IDLE_MAINTENANCE_END.equals(action)) {
             // We were holding a wake lock while broadcasting the idle maintenance
             // intents but now that we finished the broadcast release the wake lock.
             mWakeLock.release();
         }
     }
 }
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.server;

	import android.app.Activity;
	import android.app.ActivityManagerNative;
	import android.app.AlarmManager;
	import android.app.PendingIntent;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.os.Handler;
	import android.os.PowerManager;
	import android.os.PowerManager.WakeLock;
	import android.os.RemoteException;
	import android.os.SystemClock;
	import android.os.UserHandle;
	import android.util.Log;
	import android.util.Slog;

	/**
	* This service observes the device state and when applicable sends
	* broadcasts at the beginning and at the end of a period during which
	* observers can perform idle maintenance tasks. Typical use of the
	* idle maintenance is to perform somehow expensive tasks that can be
	* postponed to a moment when they will not degrade user experience.
	*
	* The current implementation is very simple. The start of a maintenance
	* window is announced if: the screen is off or showing a dream AND the
	* battery level is more than twenty percent AND at least one hour passed
	* activity).
	*
	* The end of a maintenance window is announced only if: a start was
	* announced AND the screen turned on or a dream was stopped.
	*/
	public class IdleMaintenanceService extends BroadcastReceiver {

	private static final boolean DEBUG = false;

	private static final String LOG_TAG = IdleMaintenanceService.class.getSimpleName();

	private static final int LAST_USER_ACTIVITY_TIME_INVALID = -1;

	private static final long MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS = 24 * 60 * 60 * 1000; // 1 day

	private static final int MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_CHARGING = 30; // percent

	private static final int MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_NOT_CHARGING = 80; // percent

	private static final int MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_RUNNING = 20; // percent

	private static final long MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START = 71 * 60 * 1000; // 71 min

	private static final long MAX_IDLE_MAINTENANCE_DURATION = 71 * 60 * 1000; // 71 min

	private static final String ACTION_UPDATE_IDLE_MAINTENANCE_STATE =
	"com.android.server.IdleMaintenanceService.action.UPDATE_IDLE_MAINTENANCE_STATE";

	private static final String ACTION_FORCE_IDLE_MAINTENANCE =
	"com.android.server.IdleMaintenanceService.action.FORCE_IDLE_MAINTENANCE";

	private static final Intent sIdleMaintenanceStartIntent;
	static {
	sIdleMaintenanceStartIntent = new Intent(Intent.ACTION_IDLE_MAINTENANCE_START);
	sIdleMaintenanceStartIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
	};

	private static final Intent sIdleMaintenanceEndIntent;
	static {
	sIdleMaintenanceEndIntent = new Intent(Intent.ACTION_IDLE_MAINTENANCE_END);
	sIdleMaintenanceEndIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
	}

	private final AlarmManager mAlarmService;

	private final BatteryService mBatteryService;

	private final PendingIntent mUpdateIdleMaintenanceStatePendingIntent;

	private final Context mContext;

	private final WakeLock mWakeLock;

	private final Handler mHandler;

	private long mLastIdleMaintenanceStartTimeMillis;

	private long mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID;

	private boolean mIdleMaintenanceStarted;

	public IdleMaintenanceService(Context context, BatteryService batteryService) {
	mContext = context;
	mBatteryService = batteryService;

	mAlarmService = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

	PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
	mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, LOG_TAG);

	mHandler = new Handler(mContext.getMainLooper());

	Intent intent = new Intent(ACTION_UPDATE_IDLE_MAINTENANCE_STATE);
	intent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
	mUpdateIdleMaintenanceStatePendingIntent = PendingIntent.getBroadcast(mContext, 0,
	intent, PendingIntent.FLAG_UPDATE_CURRENT);

	register(mHandler);
	}

	public void register(Handler handler) {
	IntentFilter intentFilter = new IntentFilter();

	// Alarm actions.
	intentFilter.addAction(ACTION_UPDATE_IDLE_MAINTENANCE_STATE);

	// Battery actions.
	intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);

	// Screen actions.
	intentFilter.addAction(Intent.ACTION_SCREEN_ON);
	intentFilter.addAction(Intent.ACTION_SCREEN_OFF);

	// Dream actions.
	intentFilter.addAction(Intent.ACTION_DREAMING_STARTED);
	intentFilter.addAction(Intent.ACTION_DREAMING_STOPPED);

	mContext.registerReceiverAsUser(this, UserHandle.ALL,
	intentFilter, null, mHandler);

	intentFilter = new IntentFilter();
	intentFilter.addAction(ACTION_FORCE_IDLE_MAINTENANCE);
	mContext.registerReceiverAsUser(this, UserHandle.ALL,
	intentFilter, android.Manifest.permission.SET_ACTIVITY_WATCHER, mHandler);
	}

	private void scheduleUpdateIdleMaintenanceState(long delayMillis) {
	final long triggetRealTimeMillis = SystemClock.elapsedRealtime() + delayMillis;
	mAlarmService.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggetRealTimeMillis,
	mUpdateIdleMaintenanceStatePendingIntent);
	}

	private void unscheduleUpdateIdleMaintenanceState() {
	mAlarmService.cancel(mUpdateIdleMaintenanceStatePendingIntent);
	}

	private void updateIdleMaintenanceState(boolean noisy) {
	if (mIdleMaintenanceStarted) {
	// Idle maintenance can be interrupted by user activity, or duration
	// time out, or low battery.
	if (!lastUserActivityPermitsIdleMaintenanceRunning()
	\|\| !batteryLevelAndMaintenanceTimeoutPermitsIdleMaintenanceRunning()) {
	unscheduleUpdateIdleMaintenanceState();
	mIdleMaintenanceStarted = false;
	EventLogTags.writeIdleMaintenanceWindowFinish(SystemClock.elapsedRealtime(),
	mLastUserActivityElapsedTimeMillis, mBatteryService.getBatteryLevel(),
	isBatteryCharging() ? 1 : 0);
	sendIdleMaintenanceEndIntent();
	// We stopped since we don't have enough battery or timed out but the
	// user is not using the device, so we should be able to run maintenance
	// in the next maintenance window since the battery may be charged
	// without interaction and the min interval between maintenances passed.
	if (!batteryLevelAndMaintenanceTimeoutPermitsIdleMaintenanceRunning()) {
	scheduleUpdateIdleMaintenanceState(
	getNextIdleMaintenanceIntervalStartFromNow());
	}
	}
	} else if (deviceStatePermitsIdleMaintenanceStart(noisy)
	&& lastUserActivityPermitsIdleMaintenanceStart(noisy)
	&& lastRunPermitsIdleMaintenanceStart(noisy)) {
	// Now that we started idle maintenance, we should schedule another
	// update for the moment when the idle maintenance times out.
	scheduleUpdateIdleMaintenanceState(MAX_IDLE_MAINTENANCE_DURATION);
	mIdleMaintenanceStarted = true;
	EventLogTags.writeIdleMaintenanceWindowStart(SystemClock.elapsedRealtime(),
	mLastUserActivityElapsedTimeMillis, mBatteryService.getBatteryLevel(),
	isBatteryCharging() ? 1 : 0);
	mLastIdleMaintenanceStartTimeMillis = SystemClock.elapsedRealtime();
	sendIdleMaintenanceStartIntent();
	} else if (lastUserActivityPermitsIdleMaintenanceStart(noisy)) {
	if (lastRunPermitsIdleMaintenanceStart(noisy)) {
	// The user does not use the device and we did not run maintenance in more
	// than the min interval between runs, so schedule an update - maybe the
	// battery will be charged latter.
	scheduleUpdateIdleMaintenanceState(MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START);
	} else {
	// The user does not use the device but we have run maintenance in the min
	// interval between runs, so schedule an update after the min interval ends.
	scheduleUpdateIdleMaintenanceState(
	getNextIdleMaintenanceIntervalStartFromNow());
	}
	}
	}

	private long getNextIdleMaintenanceIntervalStartFromNow() {
	return mLastIdleMaintenanceStartTimeMillis + MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS
	- SystemClock.elapsedRealtime();
	}

	private void sendIdleMaintenanceStartIntent() {
	mWakeLock.acquire();
	try {
	ActivityManagerNative.getDefault().performIdleMaintenance();
	} catch (RemoteException e) {
	}
	mContext.sendOrderedBroadcastAsUser(sIdleMaintenanceStartIntent, UserHandle.ALL,
	null, this, mHandler, Activity.RESULT_OK, null, null);
	}

	private void sendIdleMaintenanceEndIntent() {
	mWakeLock.acquire();
	mContext.sendOrderedBroadcastAsUser(sIdleMaintenanceEndIntent, UserHandle.ALL,
	null, this, mHandler, Activity.RESULT_OK, null, null);
	}

	private boolean deviceStatePermitsIdleMaintenanceStart(boolean noisy) {
	final int minBatteryLevel = isBatteryCharging()
	? MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_CHARGING
	: MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_START_NOT_CHARGING;
	boolean allowed = (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID
	&& mBatteryService.getBatteryLevel() > minBatteryLevel);
	if (!allowed && noisy) {
	Slog.i("IdleMaintenance", "Idle maintenance not allowed due to power");
	}
	return allowed;
	}

	private boolean lastUserActivityPermitsIdleMaintenanceStart(boolean noisy) {
	// The last time the user poked the device is above the threshold.
	boolean allowed = (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID
	&& SystemClock.elapsedRealtime() - mLastUserActivityElapsedTimeMillis
	> MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START);
	if (!allowed && noisy) {
	Slog.i("IdleMaintenance", "Idle maintenance not allowed due to last user activity");
	}
	return allowed;
	}

	private boolean lastRunPermitsIdleMaintenanceStart(boolean noisy) {
	// Enough time passed since the last maintenance run.
	boolean allowed = SystemClock.elapsedRealtime() - mLastIdleMaintenanceStartTimeMillis
	> MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS;
	if (!allowed && noisy) {
	Slog.i("IdleMaintenance", "Idle maintenance not allowed due time since last");
	}
	return allowed;
	}

	private boolean lastUserActivityPermitsIdleMaintenanceRunning() {
	// The user is not using the device.
	return (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID);
	}

	private boolean batteryLevelAndMaintenanceTimeoutPermitsIdleMaintenanceRunning() {
	// Battery not too low and the maintenance duration did not timeout.
	return (mBatteryService.getBatteryLevel() > MIN_BATTERY_LEVEL_IDLE_MAINTENANCE_RUNNING
	&& mLastIdleMaintenanceStartTimeMillis + MAX_IDLE_MAINTENANCE_DURATION
	> SystemClock.elapsedRealtime());
	}

	private boolean isBatteryCharging() {
	return mBatteryService.getPlugType() > 0
	&& mBatteryService.getInvalidCharger() == 0;
	}

	@Override
	public void onReceive(Context context, Intent intent) {
	if (DEBUG) {
	Log.i(LOG_TAG, intent.getAction());
	}
	String action = intent.getAction();
	if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
	// We care about battery only if maintenance is in progress so we can
	// stop it if battery is too low. Note that here we assume that the
	// maintenance clients are properly holding a wake lock. We will
	// refactor the maintenance to use services instead of intents for the
	// next release. The only client for this for now is internal an holds
	// a wake lock correctly.
	if (mIdleMaintenanceStarted) {
	updateIdleMaintenanceState(false);
	}
	} else if (Intent.ACTION_SCREEN_ON.equals(action)
	\|\| Intent.ACTION_DREAMING_STOPPED.equals(action)) {
	mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID;
	// Unschedule any future updates since we already know that maintenance
	// cannot be performed since the user is back.
	unscheduleUpdateIdleMaintenanceState();
	// If the screen went on/stopped dreaming, we know the user is using the
	// device which means that idle maintenance should be stopped if running.
	updateIdleMaintenanceState(false);
	} else if (Intent.ACTION_SCREEN_OFF.equals(action)
	\|\| Intent.ACTION_DREAMING_STARTED.equals(action)) {
	mLastUserActivityElapsedTimeMillis = SystemClock.elapsedRealtime();
	// If screen went off/started dreaming, we may be able to start idle maintenance
	// after the minimal user inactivity elapses. We schedule an alarm for when
	// this timeout elapses since the device may go to sleep by then.
	scheduleUpdateIdleMaintenanceState(MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START);
	} else if (ACTION_UPDATE_IDLE_MAINTENANCE_STATE.equals(action)) {
	updateIdleMaintenanceState(false);
	} else if (ACTION_FORCE_IDLE_MAINTENANCE.equals(action)) {
	long now = SystemClock.elapsedRealtime() - 1;
	mLastUserActivityElapsedTimeMillis = now - MIN_USER_INACTIVITY_IDLE_MAINTENANCE_START;
	mLastIdleMaintenanceStartTimeMillis = now - MIN_IDLE_MAINTENANCE_INTERVAL_MILLIS;
	updateIdleMaintenanceState(true);
	} else if (Intent.ACTION_IDLE_MAINTENANCE_START.equals(action)
	\|\| Intent.ACTION_IDLE_MAINTENANCE_END.equals(action)) {
	// We were holding a wake lock while broadcasting the idle maintenance
	// intents but now that we finished the broadcast release the wake lock.
	mWakeLock.release();
	}
	}
	}