Teach Background Fetch how to start a new fetch.

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 <memory>
 #include <set>
-#include <string>
-#include <unordered_map>
+#include <vector>
 
+#include "base/callback_forward.h"
 #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/browser/background_fetch/background_fetch_registration_id.h"
 #include "content/common/content_export.h"
-#include "url/origin.h"
+#include "third_party/WebKit/public/platform/modules/background_fetch/background_fetch.mojom.h"
 
 namespace content {
 
-class BackgroundFetchContext;
+class BackgroundFetchJobData;
+struct ServiceWorkerFetchRequest;
 
 // 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);
+  using CreateRegistrationCallback =
+      base::OnceCallback<void(blink::mojom::BackgroundFetchError,
+                              std::unique_ptr<BackgroundFetchJobData>)>;
+  using DeleteRegistrationCallback =
+      base::OnceCallback<void(blink::mojom::BackgroundFetchError)>;
+
+  BackgroundFetchDataManager();
   ~BackgroundFetchDataManager();
 
-  // Called by BackgroundFetchContext when a new request is started, this will
-  // store all of the necessary metadata to track the request.
-  std::unique_ptr<BackgroundFetchJobData> CreateRequest(
-      std::unique_ptr<BackgroundFetchJobInfo> job_info,
-      BackgroundFetchRequestInfos request_infos);
+  // Creates and stores a new registration with the given properties. Will
+  // invoke the |callback| when the registration has been created, which may
+  // fail due to invalid input or storage errors.
+  void CreateRegistration(
+      const BackgroundFetchRegistrationId& registration_id,
+      const std::vector<ServiceWorkerFetchRequest>& requests,
+      const BackgroundFetchOptions& options,
+      CreateRegistrationCallback callback);
+
+  // Deletes the registration identified by |registration_id|. Will invoke the
+  // |callback| when the registration has been deleted from storage.
+  void DeleteRegistration(const BackgroundFetchRegistrationId& registration_id,
+                          DeleteRegistrationCallback callback);
 
  private:
-  void WriteJobToStorage(std::unique_ptr<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_;
-
-  // Set of known background fetch registration ids.
-  std::set<BackgroundFetchRegistrationId> known_registrations_;
-
-  // Temporary map to hold data which will be written to storage.
-  // Map from job_guid to JobInfo.
-  std::unordered_map<std::string, std::unique_ptr<BackgroundFetchJobInfo>>
-      job_map_;
-  // Map from job_guid to RequestInfos.
-  std::unordered_map<std::string, BackgroundFetchRequestInfos> request_map_;
+  // TODO(peter): Created registrations should write to storage as opposed to
+  // a map scoped to the lifetime of this instance.
+  std::set<BackgroundFetchRegistrationId> registrations_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundFetchDataManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_DATA_MANAGER_H_