Make the BackgroundFetchJobController a per-job object

content/browser/background_fetch/background_fetch_data_manager.h

 // 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.
 
 #ifndef CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_DATA_MANAGER_H_
 #define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_DATA_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <unordered_map>
 
 #include "base/macros.h"
 #include "content/browser/background_fetch/background_fetch_job_data.h"
+#include "content/browser/background_fetch/background_fetch_job_info.h"
 #include "content/common/content_export.h"
 #include "url/origin.h"
 
 namespace content {
 
 class BackgroundFetchContext;
-class BackgroundFetchJobInfo;
 
 // The BackgroundFetchDataManager keeps track of all of the outstanding requests
 // which are in process in the DownloadManager. When Chromium restarts, it is
 // responsibile for reconnecting all the in progress downloads with an observer
 // which will keep the metadata up to date.
 class CONTENT_EXPORT BackgroundFetchDataManager {
  public:
   explicit BackgroundFetchDataManager(
       BackgroundFetchContext* background_fetch_context);
   ~BackgroundFetchDataManager();
 
   // Called by BackgroundFetchContext when a new request is started, this will
-  // store all of the necessary metadata to track the request. The lifetime of
-  // the returned pointer is tied to the lifetime of the
-  // BackgroundFetchDataManager.
-  // TODO(harkness): Lifetime should be tied to the lifetime of the associated
-  // JobController once there is a JobController per request.
+  // store all of the necessary metadata to track the request. The caller takes
+  // ownership of the JobData created.

[Peter Beverloo, 2017/03/08 14:27:04]

Then we should return an std::unique_ptr<>.

[harkness, 2017/03/09 13:33:25]

Done.

   BackgroundFetchJobData* CreateRequest(
       const BackgroundFetchJobInfo& job_info,
-      BackgroundFetchRequestInfos request_infos);
+      BackgroundFetchRequestInfos& request_infos);
 
  private:
+  void WriteJobToStorage(const BackgroundFetchJobInfo& job_info,
+                         BackgroundFetchRequestInfos& request_infos);
+
+  BackgroundFetchRequestInfos ReadRequestsFromStorage(
+      const std::string& job_guid);
+
   // BackgroundFetchContext owns this BackgroundFetchDataManager, so the
   // DataManager is guaranteed to be destructed before the Context.
   BackgroundFetchContext* background_fetch_context_;
 
-  // Map from <sw_registration_id, tag> to the JobData for that tag.
+  // Map from <sw_registration_id, tag> to the job_guid for that tag.
   using JobIdentifier = std::pair<int64_t, std::string>;
   std::map<JobIdentifier, std::string> service_worker_tag_map_;
 
-  // Map of batch guid to the associated BackgroundFetchJobData object.
-  std::unordered_map<std::string, std::unique_ptr<BackgroundFetchJobData>>
-      batch_map_;
+  // Temporary map to hold data which will be written to storage.
+  // Map from job_guid to JobInfo.
+  std::unordered_map<std::string, BackgroundFetchJobInfo> job_map_;
+  // Map from job_guid to RequestInfos.
+  std::unordered_map<std::string, BackgroundFetchRequestInfos> request_map_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundFetchDataManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_DATA_MANAGER_H_