text: /*
   * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License").
   * You may not use this file except in compliance with the License.
   * A copy of the License is located at
   *
   *     http://aws.amazon.com/apache2.0/
   *
   * or in the "license" file accompanying this file. This file is distributed
   * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
   * express or implied. See the License for the specific language governing
   * permissions and limitations under the License.
   */
  
  #ifndef ALEXA_CLIENT_SDK_AVSCOMMON_SDKINTERFACES_INCLUDE_AVSCOMMON_SDKINTERFACES_SINGLESETTINGOBSERVERINTERFACE_H_
  #define ALEXA_CLIENT_SDK_AVSCOMMON_SDKINTERFACES_INCLUDE_AVSCOMMON_SDKINTERFACES_SINGLESETTINGOBSERVERINTERFACE_H_
  
  #include <string>
  
  namespace alexaClientSDK {
  namespace avsCommon {
  namespace sdkInterfaces {
  /**
   * The interface for observer of a single setting.
   */
  class SingleSettingObserverInterface {
  public:
      /**
       * Destructor
       */
      virtual ~SingleSettingObserverInterface() = default;
  
      /**
       * The callback executed when a setting is changed.
       * @param key The name of the Setting.
       * @param value The value to which the setting has to be changed.
       */
      virtual void onSettingChanged(const std::string& key, const std::string& value) = 0;
  };
  
  }  // namespace sdkInterfaces
  }  // namespace avsCommon
  }  // namespace alexaClientSDK
  #endif  // ALEXA_CLIENT_SDK_AVSCOMMON_SDKINTERFACES_INCLUDE_AVSCOMMON_SDKINTERFACES_SINGLESETTINGOBSERVERINTERFACE_H_
  