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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 
     21 import android.app.AlarmManager;
     22 import android.app.PendingIntent;
     23 import android.content.BroadcastReceiver;
     24 import android.content.Context;
     25 import android.content.Intent;
     26 import android.content.IntentFilter;
     27 import android.os.SystemClock;
     28 import android.os.UserHandle;
     29 import android.util.ArraySet;
     30 import android.util.Slog;
     31 
     32 import com.android.server.am.ActivityManagerService;
     33 import com.android.server.job.JobSchedulerService;
     34 import com.android.server.job.StateChangedListener;
     35 
     36 public final class IdleController extends StateController {
     37     private static final String TAG = "IdleController";
     38 
     39     // Policy: we decide that we're "idle" if the device has been unused /
     40     // screen off or dreaming for at least this long
     41     private long mInactivityIdleThreshold;
     42     private long mIdleWindowSlop;
     43     final ArraySet<JobStatus> mTrackedTasks = new ArraySet<>();
     44     IdlenessTracker mIdleTracker;
     45 
     46     // Singleton factory
     47     private static Object sCreationLock = new Object();
     48     private static volatile IdleController sController;
     49 
     50     public static IdleController get(JobSchedulerService service) {
     51         synchronized (sCreationLock) {
     52             if (sController == null) {
     53                 sController = new IdleController(service, service.getContext(), service.getLock());
     54             }
     55             return sController;
     56         }
     57     }
     58 
     59     private IdleController(StateChangedListener stateChangedListener, Context context,
     60                 Object lock) {
     61         super(stateChangedListener, context, lock);
     62         initIdleStateTracking();
     63     }
     64 
     65     /**
     66      * StateController interface
     67      */
     68     @Override
     69     public void maybeStartTrackingJobLocked(JobStatus taskStatus, JobStatus lastJob) {
     70         if (taskStatus.hasIdleConstraint()) {
     71             mTrackedTasks.add(taskStatus);
     72             taskStatus.setTrackingController(JobStatus.TRACKING_IDLE);
     73             taskStatus.setIdleConstraintSatisfied(mIdleTracker.isIdle());
     74         }
     75     }
     76 
     77     @Override
     78     public void maybeStopTrackingJobLocked(JobStatus taskStatus, JobStatus incomingJob,
     79             boolean forUpdate) {
     80         if (taskStatus.clearTrackingController(JobStatus.TRACKING_IDLE)) {
     81             mTrackedTasks.remove(taskStatus);
     82         }
     83     }
     84 
     85     /**
     86      * Interaction with the task manager service
     87      */
     88     void reportNewIdleState(boolean isIdle) {
     89         synchronized (mLock) {
     90             for (int i = mTrackedTasks.size()-1; i >= 0; i--) {
     91                 mTrackedTasks.valueAt(i).setIdleConstraintSatisfied(isIdle);
     92             }
     93         }
     94         mStateChangedListener.onControllerStateChanged();
     95     }
     96 
     97     /**
     98      * Idle state tracking, and messaging with the task manager when
     99      * significant state changes occur
    100      */
    101     private void initIdleStateTracking() {
    102         mInactivityIdleThreshold = mContext.getResources().getInteger(
    103                 com.android.internal.R.integer.config_jobSchedulerInactivityIdleThreshold);
    104         mIdleWindowSlop = mContext.getResources().getInteger(
    105                 com.android.internal.R.integer.config_jobSchedulerIdleWindowSlop);
    106         mIdleTracker = new IdlenessTracker();
    107         mIdleTracker.startTracking();
    108     }
    109 
    110     final class IdlenessTracker extends BroadcastReceiver {
    111         private AlarmManager mAlarm;
    112         private PendingIntent mIdleTriggerIntent;
    113         boolean mIdle;
    114         boolean mScreenOn;
    115 
    116         public IdlenessTracker() {
    117             mAlarm = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
    118 
    119             Intent intent = new Intent(ActivityManagerService.ACTION_TRIGGER_IDLE)
    120                     .setPackage("android")
    121                     .setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
    122             mIdleTriggerIntent = PendingIntent.getBroadcast(mContext, 0, intent, 0);
    123 
    124             // At boot we presume that the user has just "interacted" with the
    125             // device in some meaningful way.
    126             mIdle = false;
    127             mScreenOn = true;
    128         }
    129 
    130         public boolean isIdle() {
    131             return mIdle;
    132         }
    133 
    134         public void startTracking() {
    135             IntentFilter filter = new IntentFilter();
    136 
    137             // Screen state
    138             filter.addAction(Intent.ACTION_SCREEN_ON);
    139             filter.addAction(Intent.ACTION_SCREEN_OFF);
    140 
    141             // Dreaming state
    142             filter.addAction(Intent.ACTION_DREAMING_STARTED);
    143             filter.addAction(Intent.ACTION_DREAMING_STOPPED);
    144 
    145             // Debugging/instrumentation
    146             filter.addAction(ActivityManagerService.ACTION_TRIGGER_IDLE);
    147 
    148             mContext.registerReceiver(this, filter);
    149         }
    150 
    151         @Override
    152         public void onReceive(Context context, Intent intent) {
    153             final String action = intent.getAction();
    154             if (action.equals(Intent.ACTION_SCREEN_ON)
    155                     || action.equals(Intent.ACTION_DREAMING_STOPPED)) {
    156                 if (DEBUG) {
    157                     Slog.v(TAG,"exiting idle : " + action);
    158                 }
    159                 mScreenOn = true;
    160                 //cancel the alarm
    161                 mAlarm.cancel(mIdleTriggerIntent);
    162                 if (mIdle) {
    163                 // possible transition to not-idle
    164                     mIdle = false;
    165                     reportNewIdleState(mIdle);
    166                 }
    167             } else if (action.equals(Intent.ACTION_SCREEN_OFF)
    168                     || action.equals(Intent.ACTION_DREAMING_STARTED)) {
    169                 // when the screen goes off or dreaming starts, we schedule the
    170                 // alarm that will tell us when we have decided the device is
    171                 // truly idle.
    172                 final long nowElapsed = SystemClock.elapsedRealtime();
    173                 final long when = nowElapsed + mInactivityIdleThreshold;
    174                 if (DEBUG) {
    175                     Slog.v(TAG, "Scheduling idle : " + action + " now:" + nowElapsed + " when="
    176                             + when);
    177                 }
    178                 mScreenOn = false;
    179                 mAlarm.setWindow(AlarmManager.ELAPSED_REALTIME_WAKEUP,
    180                         when, mIdleWindowSlop, mIdleTriggerIntent);
    181             } else if (action.equals(ActivityManagerService.ACTION_TRIGGER_IDLE)) {
    182                 // idle time starts now. Do not set mIdle if screen is on.
    183                 if (!mIdle && !mScreenOn) {
    184                     if (DEBUG) {
    185                         Slog.v(TAG, "Idle trigger fired @ " + SystemClock.elapsedRealtime());
    186                     }
    187                     mIdle = true;
    188                     reportNewIdleState(mIdle);
    189                 } else {
    190                     if (DEBUG) {
    191                         Slog.v(TAG, "TRIGGER_IDLE received but not changing state; idle="
    192                                 + mIdle + " screen=" + mScreenOn);
    193                     }
    194                 }
    195             }
    196         }
    197     }
    198 
    199     @Override
    200     public void dumpControllerStateLocked(PrintWriter pw, int filterUid) {
    201         pw.print("Idle: ");
    202         pw.println(mIdleTracker.isIdle());
    203         pw.print("Tracking ");
    204         pw.print(mTrackedTasks.size());
    205         pw.println(":");
    206         for (int i = 0; i < mTrackedTasks.size(); i++) {
    207             final JobStatus js = mTrackedTasks.valueAt(i);
    208             if (!js.shouldDump(filterUid)) {
    209                 continue;
    210             }
    211             pw.print("  #");
    212             js.printUniqueId(pw);
    213             pw.print(" from ");
    214             UserHandle.formatUid(pw, js.getSourceUid());
    215             pw.println();
    216         }
    217     }
    218 }
    219