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diff --git a/src/com/android/providers/downloads/DownloadJobService.java b/src/com/android/providers/downloads/DownloadJobService.java
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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.providers.downloads;
+
+import static android.provider.Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI;
+
+import static com.android.providers.downloads.Constants.TAG;
+
+import android.app.job.JobParameters;
+import android.app.job.JobService;
+import android.database.ContentObserver;
+import android.util.Log;
+import android.util.SparseArray;
+
+/**
+ * Service that hosts download jobs. Each active download job is handled as a
+ * unique {@link DownloadThread} instance.
+ * <p>
+ * The majority of downloads should have ETag values to enable resuming, so if a
+ * given download isn't able to finish in the normal job timeout (10 minutes),
+ * we just reschedule the job and resume again in the future.
+ */
+public class DownloadJobService extends JobService {
+    // @GuardedBy("mActiveThreads")
+    private SparseArray<DownloadThread> mActiveThreads = new SparseArray<>();
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+
+        // While someone is bound to us, watch for database changes that should
+        // trigger notification updates.
+        getContentResolver().registerContentObserver(ALL_DOWNLOADS_CONTENT_URI, true, mObserver);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        getContentResolver().unregisterContentObserver(mObserver);
+    }
+
+    @Override
+    public boolean onStartJob(JobParameters params) {
+        final int id = params.getJobId();
+
+        // Spin up thread to handle this download
+        final DownloadInfo info = DownloadInfo.queryDownloadInfo(this, id);
+        if (info == null) {
+            Log.w(TAG, "Odd, no details found for download " + id);
+            return false;
+        }
+
+        final DownloadThread thread;
+        synchronized (mActiveThreads) {
+            thread = new DownloadThread(this, params, info);
+            mActiveThreads.put(id, thread);
+        }
+        thread.start();
+
+        return true;
+    }
+
+    @Override
+    public boolean onStopJob(JobParameters params) {
+        final int id = params.getJobId();
+
+        final DownloadThread thread;
+        synchronized (mActiveThreads) {
+            thread = mActiveThreads.removeReturnOld(id);
+        }
+        if (thread != null) {
+            // If the thread is still running, ask it to gracefully shutdown,
+            // and reschedule ourselves to resume in the future.
+            thread.requestShutdown();
+
+            Helpers.scheduleJob(this, DownloadInfo.queryDownloadInfo(this, id));
+        }
+        return false;
+    }
+
+    public void jobFinishedInternal(JobParameters params, boolean needsReschedule) {
+        synchronized (mActiveThreads) {
+            mActiveThreads.remove(params.getJobId());
+        }
+
+        // Update notifications one last time while job is protecting us
+        mObserver.onChange(false);
+
+        jobFinished(params, needsReschedule);
+    }
+
+    private ContentObserver mObserver = new ContentObserver(Helpers.getAsyncHandler()) {
+        @Override
+        public void onChange(boolean selfChange) {
+            Helpers.getDownloadNotifier(DownloadJobService.this).update();
+        }
+    };
+}