// Copyright 2015 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.

module recipes;

// RecipeValueStore maintains a set of key/value pairs. Modifying a value
// results in notifying all observers. Observers are removed when then pipe is
// closed.
interface RecipeValueStore {
  // Updates the set of key/value pairs. Keys with a null value are removed.
  UpdateValues(map<string, array<uint8>> values);

  // Attaches an observer. This results in calling OnValuesChanged() with the
  // current set of key/value pairs on the observer. The observer is removed
  // when the pipe is closed.
  SetObserver(RecipeValueStoreObserver observer);
};

struct RecipeChangeValue {
  // At least one of old or new is non-null.
  array<uint8>? old_value;
  array<uint8>? new_value;
};

interface RecipeValueStoreObserver {
  OnValuesChanged(map<string, RecipeChangeValue> changed_values);
};