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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;
     18 
     19 import java.util.Calendar;
     20 
     21 import android.app.ActivityManagerNative;
     22 import android.app.job.JobInfo;
     23 import android.app.job.JobParameters;
     24 import android.app.job.JobScheduler;
     25 import android.app.job.JobService;
     26 import android.content.ComponentName;
     27 import android.content.Context;
     28 import android.os.RemoteException;
     29 import android.util.Slog;
     30 
     31 public class MountServiceIdler extends JobService {
     32     private static final String TAG = "MountServiceIdler";
     33 
     34     private static ComponentName sIdleService =
     35             new ComponentName("android", MountServiceIdler.class.getName());
     36 
     37     private static int MOUNT_JOB_ID = 808;
     38 
     39     private boolean mStarted;
     40     private JobParameters mJobParams;
     41     private Runnable mFinishCallback = new Runnable() {
     42         @Override
     43         public void run() {
     44             Slog.i(TAG, "Got mount service completion callback");
     45             synchronized (mFinishCallback) {
     46                 if (mStarted) {
     47                     jobFinished(mJobParams, false);
     48                     mStarted = false;
     49                 }
     50             }
     51             // ... and try again tomorrow
     52             scheduleIdlePass(MountServiceIdler.this);
     53         }
     54     };
     55 
     56     @Override
     57     public boolean onStartJob(JobParameters params) {
     58         // First have the activity manager do its idle maintenance.  (Yes this job
     59         // is really more than just mount, some day it should be renamed to be system
     60         // idleer).
     61         try {
     62             ActivityManagerNative.getDefault().performIdleMaintenance();
     63         } catch (RemoteException e) {
     64         }
     65         // The mount service will run an fstrim operation asynchronously
     66         // on a designated separate thread, so we provide it with a callback
     67         // that lets us cleanly end our idle timeslice.  It's safe to call
     68         // finishIdle() from any thread.
     69         mJobParams = params;
     70         MountService ms = MountService.sSelf;
     71         if (ms != null) {
     72             synchronized (mFinishCallback) {
     73                 mStarted = true;
     74             }
     75             ms.runIdleMaintenance(mFinishCallback);
     76         }
     77         return ms != null;
     78     }
     79 
     80     @Override
     81     public boolean onStopJob(JobParameters params) {
     82         // Once we kick off the fstrim we aren't actually interruptible; just note
     83         // that we don't need to call jobFinished(), and let everything happen in
     84         // the callback from the mount service.
     85         synchronized (mFinishCallback) {
     86             mStarted = false;
     87         }
     88         return false;
     89     }
     90 
     91     /**
     92      * Schedule the idle job that will ping the mount service
     93      */
     94     public static void scheduleIdlePass(Context context) {
     95         JobScheduler tm = (JobScheduler) context.getSystemService(Context.JOB_SCHEDULER_SERVICE);
     96 
     97         Calendar calendar = tomorrowMidnight();
     98         final long timeToMidnight = calendar.getTimeInMillis() - System.currentTimeMillis();
     99 
    100         JobInfo.Builder builder = new JobInfo.Builder(MOUNT_JOB_ID, sIdleService);
    101         builder.setRequiresDeviceIdle(true);
    102         builder.setRequiresCharging(true);
    103         builder.setMinimumLatency(timeToMidnight);
    104         tm.schedule(builder.build());
    105     }
    106 
    107     private static Calendar tomorrowMidnight() {
    108         Calendar calendar = Calendar.getInstance();
    109         calendar.setTimeInMillis(System.currentTimeMillis());
    110         calendar.set(Calendar.HOUR_OF_DAY, 3);
    111         calendar.set(Calendar.MINUTE, 0);
    112         calendar.set(Calendar.SECOND, 0);
    113         calendar.set(Calendar.MILLISECOND, 0);
    114         calendar.add(Calendar.DAY_OF_MONTH, 1);
    115         return calendar;
    116     }
    117 }
    118