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      1 /*
      2  * Copyright (C) 2016 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.providers.downloads;
     18 
     19 import static android.provider.Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI;
     20 
     21 import static com.android.providers.downloads.Constants.TAG;
     22 
     23 import android.app.job.JobParameters;
     24 import android.app.job.JobService;
     25 import android.database.ContentObserver;
     26 import android.util.Log;
     27 import android.util.SparseArray;
     28 
     29 /**
     30  * Service that hosts download jobs. Each active download job is handled as a
     31  * unique {@link DownloadThread} instance.
     32  * <p>
     33  * The majority of downloads should have ETag values to enable resuming, so if a
     34  * given download isn't able to finish in the normal job timeout (10 minutes),
     35  * we just reschedule the job and resume again in the future.
     36  */
     37 public class DownloadJobService extends JobService {
     38     // @GuardedBy("mActiveThreads")
     39     private SparseArray<DownloadThread> mActiveThreads = new SparseArray<>();
     40 
     41     @Override
     42     public void onCreate() {
     43         super.onCreate();
     44 
     45         // While someone is bound to us, watch for database changes that should
     46         // trigger notification updates.
     47         getContentResolver().registerContentObserver(ALL_DOWNLOADS_CONTENT_URI, true, mObserver);
     48     }
     49 
     50     @Override
     51     public void onDestroy() {
     52         super.onDestroy();
     53         getContentResolver().unregisterContentObserver(mObserver);
     54     }
     55 
     56     @Override
     57     public boolean onStartJob(JobParameters params) {
     58         final int id = params.getJobId();
     59 
     60         // Spin up thread to handle this download
     61         final DownloadInfo info = DownloadInfo.queryDownloadInfo(this, id);
     62         if (info == null) {
     63             Log.w(TAG, "Odd, no details found for download " + id);
     64             return false;
     65         }
     66 
     67         final DownloadThread thread;
     68         synchronized (mActiveThreads) {
     69             thread = new DownloadThread(this, params, info);
     70             mActiveThreads.put(id, thread);
     71         }
     72         thread.start();
     73 
     74         return true;
     75     }
     76 
     77     @Override
     78     public boolean onStopJob(JobParameters params) {
     79         final int id = params.getJobId();
     80 
     81         final DownloadThread thread;
     82         synchronized (mActiveThreads) {
     83             thread = mActiveThreads.removeReturnOld(id);
     84         }
     85         if (thread != null) {
     86             // If the thread is still running, ask it to gracefully shutdown,
     87             // and reschedule ourselves to resume in the future.
     88             thread.requestShutdown();
     89 
     90             Helpers.scheduleJob(this, DownloadInfo.queryDownloadInfo(this, id));
     91         }
     92         return false;
     93     }
     94 
     95     public void jobFinishedInternal(JobParameters params, boolean needsReschedule) {
     96         synchronized (mActiveThreads) {
     97             mActiveThreads.remove(params.getJobId());
     98         }
     99 
    100         // Update notifications one last time while job is protecting us
    101         mObserver.onChange(false);
    102 
    103         jobFinished(params, needsReschedule);
    104     }
    105 
    106     private ContentObserver mObserver = new ContentObserver(Helpers.getAsyncHandler()) {
    107         @Override
    108         public void onChange(boolean selfChange) {
    109             Helpers.getDownloadNotifier(DownloadJobService.this).update();
    110         }
    111     };
    112 }
    113