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// Copyright (c) 2012 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_VALUE_STORE_VALUE_STORE_FRONTEND_H_
#define CHROME_BROWSER_VALUE_STORE_VALUE_STORE_FRONTEND_H_
#include <string>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "base/values.h"
class FilePath;
class ValueStore;
// A frontend for a LeveldbValueStore, for use on the UI thread.
class ValueStoreFrontend
: public base::SupportsWeakPtr<ValueStoreFrontend>,
public base::NonThreadSafe {
public:
typedef base::Callback<void(scoped_ptr<base::Value>)> ReadCallback;
ValueStoreFrontend();
explicit ValueStoreFrontend(const FilePath& db_path);
// This variant is useful for testing (using a mock ValueStore).
explicit ValueStoreFrontend(ValueStore* value_store);
~ValueStoreFrontend();
void Init(const FilePath& db_path);
// Retrieves a value from the database asynchronously, passing a copy to
// |callback| when ready. NULL is passed if no matching entry is found.
void Get(const std::string& key, const ReadCallback& callback);
// Sets a value with the given key.
void Set(const std::string& key, scoped_ptr<base::Value> value);
// Removes the value with the given key.
void Remove(const std::string& key);
private:
class Backend;
// A helper class to manage lifetime of the backing ValueStore, which lives
// on the FILE thread.
scoped_refptr<Backend> backend_;
DISALLOW_COPY_AND_ASSIGN(ValueStoreFrontend);
};
#endif // CHROME_BROWSER_VALUE_STORE_VALUE_STORE_FRONTEND_H_
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