components/offline_pages/offline_page_metadata_store.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
   6 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
   7
   8 #include <vector>
   9
  10 #include "base/callback.h"
  11
  12 class GURL;
  13
  14 namespace offline_pages {
  15
  16 struct OfflinePageItem;
  17
  18 // OfflinePageMetadataStore keeps metadata for the offline pages.
  19 // Ability to create multiple instances of the store as well as behavior of
  20 // asynchronous operations when the object is being destroyed, before such
  21 // operation finishes will depend on implementation. It should be possbile to
  22 // issue multiple asynchronous operations in parallel.
  23 class OfflinePageMetadataStore {
  24  public:
  25   typedef base::Callback<void(bool, const std::vector<OfflinePageItem>&)>
  26       LoadCallback;
  27   typedef base::Callback<void(bool)> UpdateCallback;
  28
  29   OfflinePageMetadataStore();
  30   virtual ~OfflinePageMetadataStore();
  31
  32   // Get all of the offline pages from the store.
  33   virtual void Load(const LoadCallback& callback) = 0;
  34
  35   // Asynchronously adds offline page metadata to the store for a given URL.
  36   // Result of the update is passed in callback.
  37   virtual void AddOfflinePage(const OfflinePageItem& offline_page,
  38                               const UpdateCallback& callback) = 0;
  39
  40   // Asynchronously removes offline page metadata from the store.
  41   // Result of the update is passed in callback.
  42   virtual void RemoveOfflinePage(const GURL& page_url,
  43                                  const UpdateCallback& callback) = 0;
  44 };
  45
  46 }  // namespace offline_pages
  47
  48 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_