BatteryController.java revision 1a30bd9b13fd127d9bbfdc5fd4cb2f80ab7ece21
1/* 2 * Copyright (C) 2014 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 17package com.android.server.job.controllers; 18 19import android.content.BroadcastReceiver; 20import android.content.Context; 21import android.content.Intent; 22import android.content.IntentFilter; 23import android.os.BatteryManager; 24import android.os.BatteryManagerInternal; 25import android.os.SystemClock; 26import android.util.Slog; 27 28import com.android.internal.annotations.VisibleForTesting; 29import com.android.server.LocalServices; 30import com.android.server.job.JobSchedulerService; 31import com.android.server.job.StateChangedListener; 32 33import java.io.PrintWriter; 34import java.util.ArrayList; 35import java.util.Iterator; 36import java.util.List; 37 38/** 39 * Simple controller that tracks whether the phone is charging or not. The phone is considered to 40 * be charging when it's been plugged in for more than two minutes, and the system has broadcast 41 * ACTION_BATTERY_OK. 42 */ 43public class BatteryController extends StateController { 44 private static final String TAG = "JobScheduler.Batt"; 45 46 private static final Object sCreationLock = new Object(); 47 private static volatile BatteryController sController; 48 49 private List<JobStatus> mTrackedTasks = new ArrayList<JobStatus>(); 50 private ChargingTracker mChargeTracker; 51 52 public static BatteryController get(JobSchedulerService taskManagerService) { 53 synchronized (sCreationLock) { 54 if (sController == null) { 55 sController = new BatteryController(taskManagerService, 56 taskManagerService.getContext()); 57 } 58 } 59 return sController; 60 } 61 62 @VisibleForTesting 63 public ChargingTracker getTracker() { 64 return mChargeTracker; 65 } 66 67 @VisibleForTesting 68 public static BatteryController getForTesting(StateChangedListener stateChangedListener, 69 Context context) { 70 return new BatteryController(stateChangedListener, context); 71 } 72 73 private BatteryController(StateChangedListener stateChangedListener, Context context) { 74 super(stateChangedListener, context); 75 mChargeTracker = new ChargingTracker(); 76 mChargeTracker.startTracking(); 77 } 78 79 @Override 80 public void maybeStartTrackingJob(JobStatus taskStatus, JobStatus lastJob) { 81 final boolean isOnStablePower = mChargeTracker.isOnStablePower(); 82 if (taskStatus.hasChargingConstraint()) { 83 synchronized (mTrackedTasks) { 84 mTrackedTasks.add(taskStatus); 85 taskStatus.chargingConstraintSatisfied.set(isOnStablePower); 86 } 87 } 88 } 89 90 @Override 91 public void maybeStopTrackingJob(JobStatus taskStatus, boolean forUpdate) { 92 if (taskStatus.hasChargingConstraint()) { 93 synchronized (mTrackedTasks) { 94 mTrackedTasks.remove(taskStatus); 95 } 96 } 97 } 98 99 private void maybeReportNewChargingState() { 100 final boolean stablePower = mChargeTracker.isOnStablePower(); 101 if (DEBUG) { 102 Slog.d(TAG, "maybeReportNewChargingState: " + stablePower); 103 } 104 boolean reportChange = false; 105 synchronized (mTrackedTasks) { 106 for (JobStatus ts : mTrackedTasks) { 107 boolean previous = ts.chargingConstraintSatisfied.getAndSet(stablePower); 108 if (previous != stablePower) { 109 reportChange = true; 110 } 111 } 112 } 113 // Let the scheduler know that state has changed. This may or may not result in an 114 // execution. 115 if (reportChange) { 116 mStateChangedListener.onControllerStateChanged(); 117 } 118 // Also tell the scheduler that any ready jobs should be flushed. 119 if (stablePower) { 120 mStateChangedListener.onRunJobNow(null); 121 } 122 } 123 124 public class ChargingTracker extends BroadcastReceiver { 125 /** 126 * Track whether we're "charging", where charging means that we're ready to commit to 127 * doing work. 128 */ 129 private boolean mCharging; 130 /** Keep track of whether the battery is charged enough that we want to do work. */ 131 private boolean mBatteryHealthy; 132 133 public ChargingTracker() { 134 } 135 136 public void startTracking() { 137 IntentFilter filter = new IntentFilter(); 138 139 // Battery health. 140 filter.addAction(Intent.ACTION_BATTERY_LOW); 141 filter.addAction(Intent.ACTION_BATTERY_OKAY); 142 // Charging/not charging. 143 filter.addAction(BatteryManager.ACTION_CHARGING); 144 filter.addAction(BatteryManager.ACTION_DISCHARGING); 145 mContext.registerReceiver(this, filter); 146 147 // Initialise tracker state. 148 BatteryManagerInternal batteryManagerInternal = 149 LocalServices.getService(BatteryManagerInternal.class); 150 mBatteryHealthy = !batteryManagerInternal.getBatteryLevelLow(); 151 mCharging = batteryManagerInternal.isPowered(BatteryManager.BATTERY_PLUGGED_ANY); 152 } 153 154 boolean isOnStablePower() { 155 return mCharging && mBatteryHealthy; 156 } 157 158 @Override 159 public void onReceive(Context context, Intent intent) { 160 onReceiveInternal(intent); 161 } 162 163 @VisibleForTesting 164 public void onReceiveInternal(Intent intent) { 165 final String action = intent.getAction(); 166 if (Intent.ACTION_BATTERY_LOW.equals(action)) { 167 if (DEBUG) { 168 Slog.d(TAG, "Battery life too low to do work. @ " 169 + SystemClock.elapsedRealtime()); 170 } 171 // If we get this action, the battery is discharging => it isn't plugged in so 172 // there's no work to cancel. We track this variable for the case where it is 173 // charging, but hasn't been for long enough to be healthy. 174 mBatteryHealthy = false; 175 } else if (Intent.ACTION_BATTERY_OKAY.equals(action)) { 176 if (DEBUG) { 177 Slog.d(TAG, "Battery life healthy enough to do work. @ " 178 + SystemClock.elapsedRealtime()); 179 } 180 mBatteryHealthy = true; 181 maybeReportNewChargingState(); 182 } else if (BatteryManager.ACTION_CHARGING.equals(action)) { 183 if (DEBUG) { 184 Slog.d(TAG, "Received charging intent, fired @ " 185 + SystemClock.elapsedRealtime()); 186 } 187 mCharging = true; 188 maybeReportNewChargingState(); 189 } else if (BatteryManager.ACTION_DISCHARGING.equals(action)) { 190 if (DEBUG) { 191 Slog.d(TAG, "Disconnected from power."); 192 } 193 mCharging = false; 194 maybeReportNewChargingState(); 195 } 196 } 197 } 198 199 @Override 200 public void dumpControllerState(PrintWriter pw) { 201 pw.println("Batt."); 202 pw.println("Stable power: " + mChargeTracker.isOnStablePower()); 203 synchronized (mTrackedTasks) { 204 Iterator<JobStatus> it = mTrackedTasks.iterator(); 205 if (it.hasNext()) { 206 pw.print(String.valueOf(it.next().hashCode())); 207 } 208 while (it.hasNext()) { 209 pw.print("," + String.valueOf(it.next().hashCode())); 210 } 211 pw.println(); 212 } 213 } 214} 215