// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <string>

namespace zxdb {

class SettingStore;

// Interface for listening to changes to a particular SettingStore.
// The main use case for this is to listen to the System settings for some
// changes (eg. the BuildIDIndex needs to know when a new path has been added
// in order to index it).
//
// Note that an observer listens for a particular setting:
//
//    store.AddObserver(settings::kSomeSetting, this);
class SettingStoreObserver {
 public:
  // The store is given because an observer could be listening to two stores at
  // the same time. It's the observer's job to correctly identify the setting
  // and call the correct getter/setter functions.
  virtual void OnSettingChanged(const SettingStore&,
                                const std::string& setting_name) = 0;
};

}  // namespace zxdb