Componentize //chrome/browser/offline_pages

Componentize offline_page_metadata_store_impl.[cc/h], unittest and offline_pages.proto file.

Updated BUILD.gn and corresponding .gypi files for the same.

BUG=507284

Review URL: https://codereview.chromium.org/1226173004

Cr-Commit-Position: refs/heads/master@{#339852}

1 files changed, 67 insertions, 0 deletions

diff --git a/components/offline_pages/offline_page_metadata_store_impl.h b/components/offline_pages/offline_page_metadata_store_impl.h
new file mode 100644
index 0000000..5eb24fd
--- /dev/null
+++ b/components/offline_pages/offline_page_metadata_store_impl.h
@@ -0,0 +1,67 @@
+// 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_