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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.
class ExtensionSettingsLeveldbStorage : public ExtensionSettingsStorage {
public:
// Tries to create a leveldb storage area for an extension at a base path.
// Returns NULL if creation fails.
// Must be run on the FILE thread.
static ExtensionSettingsLeveldbStorage* Create(
const FilePath& base_path, const std::string& extension_id);
// Can be run on any thread.
virtual void DeleteSoon() OVERRIDE;
virtual void Get(const std::string& key, Callback* callback) OVERRIDE;
virtual void Get(const ListValue& keys, Callback* callback) OVERRIDE;
virtual void Get(Callback* callback) OVERRIDE;
virtual void Set(
const std::string& key, const Value& value, Callback* callback) OVERRIDE;
virtual void Set(const DictionaryValue& values, Callback* callback) OVERRIDE;
virtual void Remove(const std::string& key, Callback* callback) OVERRIDE;
virtual void Remove(const ListValue& keys, Callback* callback) OVERRIDE;
virtual void Clear(Callback *callback) OVERRIDE;
private:
// Ownership of db is taken.
explicit ExtensionSettingsLeveldbStorage(leveldb::DB* db);
// This must only be deleted on the FILE thread.
friend class DeleteTask<ExtensionSettingsLeveldbStorage>;
virtual ~ExtensionSettingsLeveldbStorage();
// leveldb backend.
scoped_ptr<leveldb::DB> db_;
// Whether this has or is about to be deleted on the FILE thread.
// Used to prevent any use of this after DeleteSoon() is called.
bool marked_for_deletion_;
DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsLeveldbStorage);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_LEVELDB_STORAGE_H_
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