Svetoslav | b3038ec | 2013-02-13 14:39:30 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server; |
| 18 | |
| 19 | import android.app.Activity; |
| 20 | import android.content.BroadcastReceiver; |
| 21 | import android.content.Context; |
| 22 | import android.content.Intent; |
| 23 | import android.content.IntentFilter; |
| 24 | import android.os.BatteryManager; |
| 25 | import android.os.Handler; |
| 26 | import android.os.Looper; |
| 27 | import android.os.PowerManager; |
| 28 | import android.os.PowerManager.WakeLock; |
| 29 | import android.os.SystemClock; |
| 30 | import android.os.UserHandle; |
| 31 | import android.util.Log; |
| 32 | |
| 33 | import java.util.Calendar; |
| 34 | import java.util.TimeZone; |
| 35 | |
| 36 | /** |
| 37 | * This service observes the device state and when applicable sends |
| 38 | * broadcasts at the beginning and at the end of a period during which |
| 39 | * observers can perform idle maintenance tasks. Typical use of the |
| 40 | * idle maintenance is to perform somehow expensive tasks that can be |
| 41 | * postponed to a moment when they will not degrade user experience. |
| 42 | * |
| 43 | * The current implementation is very simple. The start of a maintenance |
| 44 | * window is announced if: the screen is off or showing a dream AND the |
| 45 | * battery level is more than twenty percent AND at least one hour passed |
| 46 | * since the screen went off or a dream started (i.e. since the last user |
| 47 | * activity). |
| 48 | * |
| 49 | * The end of a maintenance window is announced only if: a start was |
| 50 | * announced AND the screen turned on or a dream was stopped. |
| 51 | */ |
| 52 | public class IdleMaintenanceService extends BroadcastReceiver { |
| 53 | |
| 54 | private final boolean DEBUG = false; |
| 55 | |
| 56 | private static final String LOG_TAG = IdleMaintenanceService.class.getSimpleName(); |
| 57 | |
| 58 | private static final int LAST_USER_ACTIVITY_TIME_INVALID = -1; |
| 59 | |
| 60 | private static final int MIN_IDLE_MAINTENANCE_START_BATTERY_LEVEL = 20; // percent |
| 61 | |
| 62 | private static final long MIN_IDLE_MAINTENANCE_START_USER_INACTIVITY = 60 * 60 * 1000; // 1 hour |
| 63 | |
| 64 | private final Intent mIdleMaintenanceStartIntent = |
| 65 | new Intent(Intent.ACTION_IDLE_MAINTENANCE_START); |
| 66 | |
| 67 | private final Intent mIdleMaintenanceEndIntent = |
| 68 | new Intent(Intent.ACTION_IDLE_MAINTENANCE_END); |
| 69 | |
| 70 | private final Context mContext; |
| 71 | |
| 72 | private final WakeLock mWakeLock; |
| 73 | |
| 74 | private final Handler mHandler; |
| 75 | |
| 76 | private final Calendar mTempCalendar = Calendar.getInstance(); |
| 77 | |
| 78 | private final Calendar mLastIdleMaintenanceStartTime = Calendar.getInstance(); |
| 79 | |
| 80 | private long mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID; |
| 81 | |
| 82 | private int mBatteryLevel; |
| 83 | |
| 84 | private boolean mIdleMaintenanceStarted; |
| 85 | |
| 86 | public IdleMaintenanceService(Context context) { |
| 87 | mContext = context; |
| 88 | |
| 89 | PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE); |
| 90 | mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, LOG_TAG); |
| 91 | |
| 92 | mHandler = new Handler(mContext.getMainLooper()); |
| 93 | |
| 94 | // Move one day back so we can run maintenance the first day after starting. |
| 95 | final int prevDayOfYear = mLastIdleMaintenanceStartTime.get(Calendar.DAY_OF_YEAR) - 1; |
| 96 | mLastIdleMaintenanceStartTime.set(Calendar.DAY_OF_YEAR, prevDayOfYear); |
| 97 | |
| 98 | register(mContext.getMainLooper()); |
| 99 | } |
| 100 | |
| 101 | public void register(Looper looper) { |
| 102 | IntentFilter intentFilter = new IntentFilter(); |
| 103 | |
| 104 | // Battery actions. |
| 105 | intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED); |
| 106 | |
| 107 | // Screen actions. |
| 108 | intentFilter.addAction(Intent.ACTION_SCREEN_ON); |
| 109 | intentFilter.addAction(Intent.ACTION_SCREEN_OFF); |
| 110 | |
| 111 | // Dream actions. |
| 112 | intentFilter.addAction(Intent.ACTION_DREAMING_STARTED); |
| 113 | intentFilter.addAction(Intent.ACTION_DREAMING_STOPPED); |
| 114 | |
| 115 | mContext.registerReceiverAsUser(this, UserHandle.ALL, |
| 116 | intentFilter, null, new Handler(looper)); |
| 117 | } |
| 118 | |
| 119 | private void updateIdleMaintenanceState() { |
| 120 | if (mIdleMaintenanceStarted) { |
| 121 | // Idle maintenance can be interrupted only by |
| 122 | // a change of the device state. |
| 123 | if (!deviceStatePermitsIdleMaintenance()) { |
| 124 | mIdleMaintenanceStarted = false; |
| 125 | sendIdleMaintenanceEndIntent(); |
| 126 | } |
| 127 | } else if (deviceStatePermitsIdleMaintenance() |
| 128 | && lastUserActivityPermitsIdleMaintenanceStart() |
| 129 | && lastRunPermitsIdleMaintenanceStart()) { |
| 130 | mIdleMaintenanceStarted = true; |
| 131 | mLastIdleMaintenanceStartTime.setTimeInMillis(System.currentTimeMillis()); |
| 132 | sendIdleMaintenanceStartIntent(); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | private void sendIdleMaintenanceStartIntent() { |
| 137 | if (DEBUG) { |
| 138 | Log.i(LOG_TAG, "Broadcasting " + Intent.ACTION_IDLE_MAINTENANCE_START); |
| 139 | } |
| 140 | mWakeLock.acquire(); |
| 141 | mContext.sendOrderedBroadcastAsUser(mIdleMaintenanceStartIntent, UserHandle.ALL, |
| 142 | null, this, mHandler, Activity.RESULT_OK, null, null); |
| 143 | } |
| 144 | |
| 145 | private void sendIdleMaintenanceEndIntent() { |
| 146 | if (DEBUG) { |
| 147 | Log.i(LOG_TAG, "Broadcasting " + Intent.ACTION_IDLE_MAINTENANCE_END); |
| 148 | } |
| 149 | mWakeLock.acquire(); |
| 150 | mContext.sendOrderedBroadcastAsUser(mIdleMaintenanceEndIntent, UserHandle.ALL, |
| 151 | null, this, mHandler, Activity.RESULT_OK, null, null); |
| 152 | } |
| 153 | |
| 154 | private boolean deviceStatePermitsIdleMaintenance() { |
| 155 | return (mLastUserActivityElapsedTimeMillis != LAST_USER_ACTIVITY_TIME_INVALID |
| 156 | && mBatteryLevel > MIN_IDLE_MAINTENANCE_START_BATTERY_LEVEL); |
| 157 | } |
| 158 | |
| 159 | private boolean lastUserActivityPermitsIdleMaintenanceStart() { |
| 160 | return (SystemClock.elapsedRealtime() - mLastUserActivityElapsedTimeMillis |
| 161 | > MIN_IDLE_MAINTENANCE_START_USER_INACTIVITY); |
| 162 | } |
| 163 | |
| 164 | private boolean lastRunPermitsIdleMaintenanceStart() { |
| 165 | Calendar now = mTempCalendar; |
| 166 | // Not setting the Locale since we do not care of locale |
| 167 | // specific properties such as the first day of the week. |
| 168 | now.setTimeZone(TimeZone.getDefault()); |
| 169 | now.setTimeInMillis(System.currentTimeMillis()); |
| 170 | |
| 171 | Calendar lastRun = mLastIdleMaintenanceStartTime; |
| 172 | // Not setting the Locale since we do not care of locale |
| 173 | // specific properties such as the first day of the week. |
| 174 | lastRun.setTimeZone(TimeZone.getDefault()); |
| 175 | |
| 176 | return now.get(Calendar.DAY_OF_YEAR) != lastRun.get(Calendar.DAY_OF_YEAR); |
| 177 | } |
| 178 | |
| 179 | @Override |
| 180 | public void onReceive(Context context, Intent intent) { |
| 181 | if (DEBUG) { |
| 182 | Log.i(LOG_TAG, intent.getAction()); |
| 183 | } |
| 184 | String action = intent.getAction(); |
| 185 | if (Intent.ACTION_BATTERY_CHANGED.equals(action)) { |
| 186 | final int maxBatteryLevel = intent.getExtras().getInt(BatteryManager.EXTRA_SCALE); |
| 187 | final int currBatteryLevel = intent.getExtras().getInt(BatteryManager.EXTRA_LEVEL); |
| 188 | mBatteryLevel = (int) (((float) maxBatteryLevel / 100) * currBatteryLevel); |
| 189 | } else if (Intent.ACTION_SCREEN_ON.equals(action) |
| 190 | || Intent.ACTION_DREAMING_STOPPED.equals(action)) { |
| 191 | mLastUserActivityElapsedTimeMillis = LAST_USER_ACTIVITY_TIME_INVALID; |
| 192 | } else if (Intent.ACTION_SCREEN_OFF.equals(action) |
| 193 | || Intent.ACTION_DREAMING_STARTED.equals(action)) { |
| 194 | mLastUserActivityElapsedTimeMillis = SystemClock.elapsedRealtime(); |
| 195 | } else if (Intent.ACTION_IDLE_MAINTENANCE_START.equals(action) |
| 196 | || Intent.ACTION_IDLE_MAINTENANCE_END.equals(action)) { |
| 197 | mWakeLock.release(); |
| 198 | return; |
| 199 | } |
| 200 | updateIdleMaintenanceState(); |
| 201 | } |
| 202 | } |