Componentize //chrome/browser/offline_pages

chrome/browser/offline_pages/offline_page_metadata_store_impl.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 CHROME_BROWSER_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_IMPL_H_
-#define CHROME_BROWSER_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_IMPL_H_
-
-#include <vector>
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "components/leveldb_proto/proto_database.h"
-#include "components/offline_pages/offline_page_metadata_store.h"
-
-namespace base {
-class FilePath;
-}
-
-namespace offline_pages {
-
-class OfflinePageEntry;
-
-// Implements OfflinePageMetadataStore using leveldb_proto::ProtoDatabase
-// component. Stores metadata of offline pages as serialized protobufs in a
-// LevelDB key/value pairs.
-// Underlying implementation guarantees that all of the method calls will be
-// executed sequentially, and started operations will finish even after the
-// store is already destroyed (callbacks will be called).
-class OfflinePageMetadataStoreImpl : public OfflinePageMetadataStore {
- public:
-  OfflinePageMetadataStoreImpl(
-      scoped_ptr<leveldb_proto::ProtoDatabase<OfflinePageEntry>> database,
-      const base::FilePath& database_dir);
-  ~OfflinePageMetadataStoreImpl() override;
-
-  // OfflinePageMetadataStore implementation:
-  void Load(const LoadCallback& callback) override;
-  void AddOfflinePage(const OfflinePageItem& offline_page_record,
-                      const UpdateCallback& callback) override;
-  void RemoveOfflinePage(const GURL& page_url,
-                         const UpdateCallback& callback) override;
-
- private:
-  // Callback for when initialization of the |database_| is done.
-  void OnInitDone(bool success);
-
-  // Implements the update.
-  void UpdateEntries(
-      scoped_ptr<leveldb_proto::ProtoDatabase<OfflinePageEntry>::KeyEntryVector>
-          entries_to_save,
-      scoped_ptr<std::vector<std::string>> keys_to_remove,
-      const UpdateCallback& callback);
-
-  // Resets the database. This is to be used when one of the operations fails
-  // with no good explanation.
-  void ResetDB();
-
-  scoped_ptr<leveldb_proto::ProtoDatabase<OfflinePageEntry>> database_;
-
-  base::WeakPtrFactory<OfflinePageMetadataStoreImpl> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(OfflinePageMetadataStoreImpl);
-};
-
-}  // namespace offline_pages
-
-#endif  // CHROME_BROWSER_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_IMPL_H_