buffet/storage_interface.h

// Copyright 2014 The Chromium OS 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 BUFFET_STORAGE_INTERFACE_H_
#define BUFFET_STORAGE_INTERFACE_H_

#include <memory>

#include <base/values.h>

namespace buffet {

// We need to persist data in a couple places, and it is convenient to hide
// the details of this storage behind an interface for test purposes.
class StorageInterface {
 public:
  // Load the device registration configuration from storage.
  // If it fails (e.g. the storage container [file?] doesn't exist), then
  // it returns empty unique_ptr (aka nullptr).
  virtual std::unique_ptr<base::Value> Load() = 0;

  // Save the device registration configuration to storage.
  // If saved successfully, returns true. Could fail when writing to
  // physical storage like file system for various reasons (out of disk space,
  // access permissions, etc).
  virtual bool Save(const base::Value* config) = 0;
};

}  // namespace buffet

#endif  // BUFFET_STORAGE_INTERFACE_H_