Skeleton of the overall design for the database for Pver4

components/safe_browsing_db/v4_database.cc

+// Copyright 2016 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.
+
+#include "components/safe_browsing_db/v4_database.h"
+
+namespace safe_browsing {
+
+// static
+V4DatabaseFactory* V4Database::factory_ = NULL;
+
+// static
+// Factory method, should be called on the Safe Browsing sequenced task runner,
+// which is also passed to the function as |db_task_runner|.
+V4Database* V4Database::Create(
+    const scoped_refptr<base::SequencedTaskRunner>& db_task_runner,
+    const base::FilePath& base_path,
+    ListInfoMap list_info_map) {
+  DCHECK(db_task_runner->RunsTasksOnCurrentThread());
+  if (!factory_) {
+    StoreMap store_map;
+    // TODO(vakh): Populate the store_map using list_suffix_map.
+    return new V4Database(db_task_runner, std::move(store_map));
+  } else {
+    return factory_->CreateV4Database(db_task_runner, base_path, list_info_map);
+  }
+}
+
+V4Database::V4Database(
+    const scoped_refptr<base::SequencedTaskRunner>& db_task_runner,
+    StoreMap store_map) {
+  // TODO(vakh): Implement skeleton
+}
+
+V4Database::~V4Database() {}
+
+bool V4Database::ResetDatabase() {
+  // TODO(vakh): Delete the stores. Delete the backing files.
+  return true;
+}
+
+}  // namespace safe_browsing