Make the BackgroundFetchJobController a per-job object

content/browser/background_fetch/background_fetch_context.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/background_fetch/background_fetch_context.h"
 
 #include "content/browser/background_fetch/background_fetch_job_info.h"
 #include "content/browser/background_fetch/background_fetch_request_info.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/public/browser/browser_context.h"
-#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/storage_partition.h"
 
 namespace content {
 
 BackgroundFetchContext::BackgroundFetchContext(
     BrowserContext* browser_context,
     StoragePartition* storage_partition,
     const scoped_refptr<ServiceWorkerContextWrapper>& service_worker_context)
-    : service_worker_context_(service_worker_context),
-      background_fetch_job_controller_(browser_context, storage_partition),
+    : browser_context_(browser_context),
+      storage_partition_(storage_partition),
+      service_worker_context_(service_worker_context),
       background_fetch_data_manager_(this) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   // TODO(harkness): BackgroundFetchContext should have
   // ServiceWorkerContextObserver as a parent class and should register as an
   // observer here.
 }
 
 BackgroundFetchContext::~BackgroundFetchContext() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 }
 
 void BackgroundFetchContext::Init() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   // TODO(harkness): Create the Download observer.
 }
 
 void BackgroundFetchContext::Shutdown() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&BackgroundFetchContext::ShutdownOnIO, this));
+}
+
+void BackgroundFetchContext::ShutdownOnIO() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  // Call Shutdown on all pending job controllers to give them a chance to flush
+  // any status to the DataManager.
+  for (auto& job : job_map_)
+    job.second->Shutdown();
 }
 
 void BackgroundFetchContext::CreateRequest(
     const BackgroundFetchJobInfo& job_info,
     std::vector<BackgroundFetchRequestInfo>& request_infos) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_GE(1U, request_infos.size());
+
   // Inform the data manager about the new download.
-  BackgroundFetchJobData* job_data =
+  std::unique_ptr<BackgroundFetchJobData> job_data =
       background_fetch_data_manager_.CreateRequest(job_info, request_infos);
+
   // If job_data is null, the DataManager will have logged an error.
-  if (job_data)
-    background_fetch_job_controller_.ProcessJob(job_info.guid(), job_data);
+  if (job_data) {
+    // Create a controller which drives the processing of the job. It will use
+    // the JobData to get information about individual requests for the job.
+    job_map_[job_info.guid()] = base::MakeUnique<BackgroundFetchJobController>(
+        job_info.guid(), browser_context_, storage_partition_,
+        std::move(job_data));
+  }
 }
 
 }  // namespace content