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/*
* 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.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Handler;
import android.os.Looper;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.os.SystemClock;
import android.os.UserHandle;
import android.util.Log;
import java.util.Calendar;
import java.util.TimeZone;
/**
* 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
* since the screen went off or a dream started (i.e. since the last user
* 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 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 int MIN_IDLE_MAINTENANCE_START_BATTERY_LEVEL = 20; // percent
private static final long MIN_IDLE_MAINTENANCE_START_USER_INACTIVITY = 60 * 60 * 1000; // 1 hour
private final Intent mIdleMaintenanceStartIntent =
new Intent(Intent.ACTION_IDLE_MAINTENANCE_START);
private final Intent mIdleMaintenanceEndIntent =
new Intent(Intent.ACTION_IDLE_MAINTENANCE_END);
private final Context mContext;
private final WakeLock mWakeLock;
private final Handler mHandler;
private final Calendar mTempCalendar = Calendar.getInstance();
private final Calendar mLastIdleMaintenanceStartTime = Calendar.getInstance();
private long mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID;
private int mBatteryLevel;
private boolean mIdleMaintenanceStarted;
public IdleMaintenanceService(Context context) {
mContext = context;
PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, LOG_TAG);
mHandler = new Handler(mContext.getMainLooper());
// Move one day back so we can run maintenance the first day after starting.
final int prevDayOfYear = mLastIdleMaintenanceStartTime.get(Calendar.DAY_OF_YEAR) - 1;
mLastIdleMaintenanceStartTime.set(Calendar.DAY_OF_YEAR, prevDayOfYear);
register(mContext.getMainLooper());
}
public void register(Looper looper) {
IntentFilter intentFilter = new IntentFilter();
// 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, new Handler(looper));
}
private void updateIdleMaintenanceState() {
if (mIdleMaintenanceStarted) {
// Idle maintenance can be interrupted only by
// a change of the device state.
if (!deviceStatePermitsIdleMaintenance()) {
mIdleMaintenanceStarted = false;
sendIdleMaintenanceEndIntent();
}
} else if (deviceStatePermitsIdleMaintenance()
&& lastUserActivityPermitsIdleMaintenanceStart()
&& lastRunPermitsIdleMaintenanceStart()) {
mIdleMaintenanceStarted = true;
mLastIdleMaintenanceStartTime.setTimeInMillis(System.currentTimeMillis());
sendIdleMaintenanceStartIntent();
}
}
private void sendIdleMaintenanceStartIntent() {
if (DEBUG) {
Log.i(LOG_TAG, "Broadcasting " + Intent.ACTION_IDLE_MAINTENANCE_START);
}
mWakeLock.acquire();
mContext.sendOrderedBroadcastAsUser(mIdleMaintenanceStartIntent, UserHandle.ALL,
null, this, mHandler, Activity.RESULT_OK, null, null);
}
private void sendIdleMaintenanceEndIntent() {
if (DEBUG) {
Log.i(LOG_TAG, "Broadcasting " + Intent.ACTION_IDLE_MAINTENANCE_END);
}
mWakeLock.acquire();
mContext.sendOrderedBroadcastAsUser(mIdleMaintenanceEndIntent, UserHandle.ALL,
null, this, mHandler, Activity.RESULT_OK, null, null);
}
private boolean deviceStatePermitsIdleMaintenance() {
return (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID
&& mBatteryLevel > MIN_IDLE_MAINTENANCE_START_BATTERY_LEVEL);
}
private boolean lastUserActivityPermitsIdleMaintenanceStart() {
return (SystemClock.elapsedRealtime() - mLastUserActivityElapsedTimeMillis
> MIN_IDLE_MAINTENANCE_START_USER_INACTIVITY);
}
private boolean lastRunPermitsIdleMaintenanceStart() {
Calendar now = mTempCalendar;
// Not setting the Locale since we do not care of locale
// specific properties such as the first day of the week.
now.setTimeZone(TimeZone.getDefault());
now.setTimeInMillis(System.currentTimeMillis());
Calendar lastRun = mLastIdleMaintenanceStartTime;
// Not setting the Locale since we do not care of locale
// specific properties such as the first day of the week.
lastRun.setTimeZone(TimeZone.getDefault());
return now.get(Calendar.DAY_OF_YEAR) != lastRun.get(Calendar.DAY_OF_YEAR);
}
@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)) {
final int maxBatteryLevel = intent.getExtras().getInt(BatteryManager.EXTRA_SCALE);
final int currBatteryLevel = intent.getExtras().getInt(BatteryManager.EXTRA_LEVEL);
mBatteryLevel = (int) (((float) maxBatteryLevel / 100) * currBatteryLevel);
} else if (Intent.ACTION_SCREEN_ON.equals(action)
|| Intent.ACTION_DREAMING_STOPPED.equals(action)) {
mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID;
} else if (Intent.ACTION_SCREEN_OFF.equals(action)
|| Intent.ACTION_DREAMING_STARTED.equals(action)) {
mLastUserActivityElapsedTimeMillis = SystemClock.elapsedRealtime();
} else if (Intent.ACTION_IDLE_MAINTENANCE_START.equals(action)
|| Intent.ACTION_IDLE_MAINTENANCE_END.equals(action)) {
mWakeLock.release();
return;
}
updateIdleMaintenanceState();
}
}
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