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      1 /*
      2  * Copyright (C) 2017 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.job.JobInfo;
     20 import android.app.job.JobParameters;
     21 import android.app.job.JobScheduler;
     22 import android.app.job.JobService;
     23 import android.content.ComponentName;
     24 import android.content.Context;
     25 import android.content.res.Resources;
     26 import android.os.Environment;
     27 import android.os.SystemProperties;
     28 import android.util.Slog;
     29 import android.util.TimeUtils;
     30 
     31 import com.android.internal.R;
     32 
     33 import java.util.concurrent.TimeUnit;
     34 
     35 /**
     36  * {@link JobService} that marks
     37  * {@link Environment#getDataPreloadsFileCacheDirectory() preloaded file cache} as expired after a
     38  * pre-configured timeout.
     39  */
     40 public class PreloadsFileCacheExpirationJobService extends JobService {
     41     private static final boolean DEBUG = false; // Do not submit with true
     42     private static final String TAG = "PreloadsFileCacheExpirationJobService";
     43 
     44     // TODO move all JOB_IDs into a single class to avoid collisions
     45     private static final int JOB_ID = 100500;
     46 
     47     private static final String PERSIST_SYS_PRELOADS_FILE_CACHE_EXPIRED
     48             = "persist.sys.preloads.file_cache_expired";
     49 
     50     public static void schedule(Context context) {
     51         int keepPreloadsMinDays = Resources.getSystem().getInteger(
     52                 R.integer.config_keepPreloadsMinDays); // Default is 1 week
     53         long keepPreloadsMinTimeoutMs = DEBUG ? TimeUnit.MINUTES.toMillis(2)
     54                 : TimeUnit.DAYS.toMillis(keepPreloadsMinDays);
     55         long keepPreloadsMaxTimeoutMs = DEBUG ? TimeUnit.MINUTES.toMillis(3)
     56                 : TimeUnit.DAYS.toMillis(keepPreloadsMinDays + 1);
     57 
     58         if (DEBUG) {
     59             StringBuilder sb = new StringBuilder("Scheduling expiration job to run in ");
     60             TimeUtils.formatDuration(keepPreloadsMinTimeoutMs, sb);
     61             Slog.i(TAG, sb.toString());
     62         }
     63         JobInfo expirationJob = new JobInfo.Builder(JOB_ID,
     64                 new ComponentName(context, PreloadsFileCacheExpirationJobService.class))
     65                 .setPersisted(true)
     66                 .setMinimumLatency(keepPreloadsMinTimeoutMs)
     67                 .setOverrideDeadline(keepPreloadsMaxTimeoutMs)
     68                 .build();
     69 
     70         JobScheduler jobScheduler = context.getSystemService(JobScheduler.class);
     71         jobScheduler.schedule(expirationJob);
     72     }
     73 
     74     @Override
     75     public boolean onStartJob(JobParameters params) {
     76         SystemProperties.set(PERSIST_SYS_PRELOADS_FILE_CACHE_EXPIRED, "1");
     77         Slog.i(TAG, "Set " + PERSIST_SYS_PRELOADS_FILE_CACHE_EXPIRED + "=1");
     78         return false;
     79     }
     80 
     81     @Override
     82     public boolean onStopJob(JobParameters params) {
     83         return false;
     84     }
     85 }
     86