[Offline pages] Splitting Add and Update methods in OPMStore

components/offline_pages/offline_page_metadata_store.h

 // Copyright 2015 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 COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 28 matching lines @@
   // TODO(fgorski): This enum is meant to replace |LoadStatus|.
   // Current store state. When LOADED, the store is operational. When
   // initialization or reset fails, it is reflected appropriately.
   enum StoreState {
     NOT_LOADED,
     LOADED,
     FAILED_INITIALIZATION,
     FAILED_RESET,
   };
 
+  // Statuses referring to actions taken on items in the store.
+  enum ItemActionStatus {
+    SUCCESS,
+    ALREADY_EXISTS,
+    DOESNT_EXIST,
+    STORE_ERROR,
+  };
+
   typedef base::Callback<void(LoadStatus, const std::vector<OfflinePageItem>&)>
       LoadCallback;
+  typedef base::Callback<void(ItemActionStatus)> AddCallback;
   typedef base::Callback<void(bool)> UpdateCallback;
   typedef base::Callback<void(bool)> ResetCallback;
 
   OfflinePageMetadataStore();
   virtual ~OfflinePageMetadataStore();
 
   // Get all of the offline pages from the store.
   virtual void GetOfflinePages(const LoadCallback& callback) = 0;
 
-  // Asynchronously adds or updates offline page metadata to the store.
-  // Result of the update is passed in callback.
-  virtual void AddOrUpdateOfflinePage(const OfflinePageItem& offline_page,
-                                      const UpdateCallback& callback) = 0;
+  // Asynchronously adds an offline page item metadata to the store.
+  virtual void AddOfflinePage(const OfflinePageItem& offline_page,
+                              const AddCallback& callback) = 0;
+
+  // Asynchronously updates a set of offline page items in the store.
+  virtual void UpdateOfflinePages(const std::vector<OfflinePageItem>& pages,
+                                  const UpdateCallback& callback) = 0;
 
   // Asynchronously removes offline page metadata from the store.
   // Result of the update is passed in callback.
   virtual void RemoveOfflinePages(const std::vector<int64_t>& offline_ids,
                                   const UpdateCallback& callback) = 0;
 
   // Resets the store.
   virtual void Reset(const ResetCallback& callback) = 0;
 
   // Gets the store state.
   virtual StoreState state() const = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_