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      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 
     17 package com.android.server.job.controllers;
     18 
     19 import java.io.PrintWriter;
     20 import java.util.ArrayList;
     21 
     22 import android.app.AlarmManager;
     23 import android.app.PendingIntent;
     24 import android.content.BroadcastReceiver;
     25 import android.content.ComponentName;
     26 import android.content.Context;
     27 import android.content.Intent;
     28 import android.content.IntentFilter;
     29 import android.os.SystemClock;
     30 import android.util.Slog;
     31 
     32 import com.android.server.job.JobSchedulerService;
     33 import com.android.server.job.StateChangedListener;
     34 
     35 public class IdleController extends StateController {
     36     private static final String TAG = "IdleController";
     37 
     38     // Policy: we decide that we're "idle" if the device has been unused /
     39     // screen off or dreaming for at least this long
     40     private static final long INACTIVITY_IDLE_THRESHOLD = 71 * 60 * 1000; // millis; 71 min
     41     private static final long IDLE_WINDOW_SLOP = 5 * 60 * 1000; // 5 minute window, to be nice
     42 
     43     private static final String ACTION_TRIGGER_IDLE =
     44             "com.android.server.task.controllers.IdleController.ACTION_TRIGGER_IDLE";
     45 
     46     final ArrayList<JobStatus> mTrackedTasks = new ArrayList<JobStatus>();
     47     IdlenessTracker mIdleTracker;
     48 
     49     // Singleton factory
     50     private static Object sCreationLock = new Object();
     51     private static volatile IdleController sController;
     52 
     53     public static IdleController get(JobSchedulerService service) {
     54         synchronized (sCreationLock) {
     55             if (sController == null) {
     56                 sController = new IdleController(service, service.getContext());
     57             }
     58             return sController;
     59         }
     60     }
     61 
     62     private IdleController(StateChangedListener stateChangedListener, Context context) {
     63         super(stateChangedListener, context);
     64         initIdleStateTracking();
     65     }
     66 
     67     /**
     68      * StateController interface
     69      */
     70     @Override
     71     public void maybeStartTrackingJob(JobStatus taskStatus) {
     72         if (taskStatus.hasIdleConstraint()) {
     73             synchronized (mTrackedTasks) {
     74                 mTrackedTasks.add(taskStatus);
     75                 taskStatus.idleConstraintSatisfied.set(mIdleTracker.isIdle());
     76             }
     77         }
     78     }
     79 
     80     @Override
     81     public void maybeStopTrackingJob(JobStatus taskStatus) {
     82         synchronized (mTrackedTasks) {
     83             mTrackedTasks.remove(taskStatus);
     84         }
     85     }
     86 
     87     /**
     88      * Interaction with the task manager service
     89      */
     90     void reportNewIdleState(boolean isIdle) {
     91         synchronized (mTrackedTasks) {
     92             for (JobStatus task : mTrackedTasks) {
     93                 task.idleConstraintSatisfied.set(isIdle);
     94             }
     95         }
     96         mStateChangedListener.onControllerStateChanged();
     97     }
     98 
     99     /**
    100      * Idle state tracking, and messaging with the task manager when
    101      * significant state changes occur
    102      */
    103     private void initIdleStateTracking() {
    104         mIdleTracker = new IdlenessTracker();
    105         mIdleTracker.startTracking();
    106     }
    107 
    108     class IdlenessTracker extends BroadcastReceiver {
    109         private AlarmManager mAlarm;
    110         private PendingIntent mIdleTriggerIntent;
    111         boolean mIdle;
    112 
    113         public IdlenessTracker() {
    114             mAlarm = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
    115 
    116             Intent intent = new Intent(ACTION_TRIGGER_IDLE)
    117                     .setPackage("android")
    118                     .setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
    119             mIdleTriggerIntent = PendingIntent.getBroadcast(mContext, 0, intent, 0);
    120 
    121             // At boot we presume that the user has just "interacted" with the
    122             // device in some meaningful way.
    123             mIdle = false;
    124         }
    125 
    126         public boolean isIdle() {
    127             return mIdle;
    128         }
    129 
    130         public void startTracking() {
    131             IntentFilter filter = new IntentFilter();
    132 
    133             // Screen state
    134             filter.addAction(Intent.ACTION_SCREEN_ON);
    135             filter.addAction(Intent.ACTION_SCREEN_OFF);
    136 
    137             // Dreaming state
    138             filter.addAction(Intent.ACTION_DREAMING_STARTED);
    139             filter.addAction(Intent.ACTION_DREAMING_STOPPED);
    140 
    141             // Debugging/instrumentation
    142             filter.addAction(ACTION_TRIGGER_IDLE);
    143 
    144             mContext.registerReceiver(this, filter);
    145         }
    146 
    147         @Override
    148         public void onReceive(Context context, Intent intent) {
    149             final String action = intent.getAction();
    150 
    151             if (action.equals(Intent.ACTION_SCREEN_ON)
    152                     || action.equals(Intent.ACTION_DREAMING_STOPPED)) {
    153                 // possible transition to not-idle
    154                 if (mIdle) {
    155                     if (DEBUG) {
    156                         Slog.v(TAG, "exiting idle : " + action);
    157                     }
    158                     mAlarm.cancel(mIdleTriggerIntent);
    159                     mIdle = false;
    160                     reportNewIdleState(mIdle);
    161                 }
    162             } else if (action.equals(Intent.ACTION_SCREEN_OFF)
    163                     || action.equals(Intent.ACTION_DREAMING_STARTED)) {
    164                 // when the screen goes off or dreaming starts, we schedule the
    165                 // alarm that will tell us when we have decided the device is
    166                 // truly idle.
    167                 final long nowElapsed = SystemClock.elapsedRealtime();
    168                 final long when = nowElapsed + INACTIVITY_IDLE_THRESHOLD;
    169                 if (DEBUG) {
    170                     Slog.v(TAG, "Scheduling idle : " + action + " now:" + nowElapsed + " when="
    171                             + when);
    172                 }
    173                 mAlarm.setWindow(AlarmManager.ELAPSED_REALTIME_WAKEUP,
    174                         when, IDLE_WINDOW_SLOP, mIdleTriggerIntent);
    175             } else if (action.equals(ACTION_TRIGGER_IDLE)) {
    176                 // idle time starts now
    177                 if (!mIdle) {
    178                     if (DEBUG) {
    179                         Slog.v(TAG, "Idle trigger fired @ " + SystemClock.elapsedRealtime());
    180                     }
    181                     mIdle = true;
    182                     reportNewIdleState(mIdle);
    183                 }
    184             }
    185         }
    186     }
    187 
    188     @Override
    189     public void dumpControllerState(PrintWriter pw) {
    190         synchronized (mTrackedTasks) {
    191             pw.print("Idle: ");
    192             pw.println(mIdleTracker.isIdle() ? "true" : "false");
    193             pw.println(mTrackedTasks.size());
    194             for (int i = 0; i < mTrackedTasks.size(); i++) {
    195                 final JobStatus js = mTrackedTasks.get(i);
    196                 pw.print("  ");
    197                 pw.print(String.valueOf(js.hashCode()).substring(0, 3));
    198                 pw.println("..");
    199             }
    200         }
    201     }
    202 }
    203