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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_STORAGE_CACHE_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_STORAGE_CACHE_H_
#pragma once
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/extensions/extension_settings_storage.h"
// Wraps a storage area with a cache. Ownership of the delegate storage
// will be taken by the cache.
//
// Calls to Get() will return from the cache if an entry is present, or be
// passed to the delegate and the result cached if not.
// Calls to Set() / Clear() / Remove() are written through to the delegate,
// then stored in the cache if successful.
class ExtensionSettingsStorageCache : public ExtensionSettingsStorage {
public:
// Ownership of delegate taken.
explicit ExtensionSettingsStorageCache(ExtensionSettingsStorage* delegate);
virtual ~ExtensionSettingsStorageCache();
// 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:
// Returns whether the value was found in the cache.
// Ownership of value is released to the caller and placed in value.
bool GetFromCache(const std::string& key, Value** value);
// Storage that the cache is wrapping.
scoped_ptr<ExtensionSettingsStorage> delegate_;
// The in-memory cache of settings from the delegate.
DictionaryValue cache_;
DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsStorageCache);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_STORAGE_CACHE_H_
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