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// Copyright (c) 2011 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_EXTENSIONS_EXTENSION_SETTINGS_LEVELDB_STORAGE_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_LEVELDB_STORAGE_H_
#pragma once
#include <string>
#include "base/compiler_specific.h"
#include "base/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/task.h"
#include "chrome/browser/extensions/extension_settings_storage.h"
#include "third_party/leveldatabase/src/include/leveldb/db.h"
// Extension settings storage object, backed by a leveldb database.
//
// No caching is done; that should be handled by wrapping with an
// ExtensionSettingsStorageCache.
// All methods must be run on the FILE thread.
class ExtensionSettingsLeveldbStorage : public ExtensionSettingsStorage {
public:
// Tries to create a leveldb storage area for an extension at a base path.
// Returns NULL if creation fails.
static ExtensionSettingsLeveldbStorage* Create(
const FilePath& base_path, const std::string& extension_id);
// Must be deleted on the FILE thread.
virtual ~ExtensionSettingsLeveldbStorage();
// ExtensionSettingsStorage implementation.
virtual Result Get(const std::string& key) OVERRIDE;
virtual Result Get(const std::vector<std::string>& keys) OVERRIDE;
virtual Result Get() OVERRIDE;
virtual Result Set(const std::string& key, const Value& value) OVERRIDE;
virtual Result Set(const DictionaryValue& settings) OVERRIDE;
virtual Result Remove(const std::string& key) OVERRIDE;
virtual Result Remove(const std::vector<std::string>& keys) OVERRIDE;
virtual Result Clear() OVERRIDE;
private:
// Ownership of db is taken.
explicit ExtensionSettingsLeveldbStorage(
const FilePath& db_path, leveldb::DB* db);
// Reads a setting from the database. Returns whether the read was
// successful, in which case |setting| will be reset to the Value read
// from the database. This value may be NULL.
bool ReadFromDb(
leveldb::ReadOptions options,
const std::string& key,
// Will be reset() with the result, if any.
scoped_ptr<Value>* setting);
// Returns whether the database is empty.
bool IsEmpty();
// The location of the leveldb backend.
const FilePath db_path_;
// leveldb backend.
scoped_ptr<leveldb::DB> db_;
DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsLeveldbStorage);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_LEVELDB_STORAGE_H_
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