code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.opcua.sdk.server.nodes;
  
  import org.eclipse.milo.opcua.stack.core.AttributeId;
  
  public interface AttributeObserver {
  
      /**
       * The Attribute indicated by {@code attributeId} on {@code node} changed.
       *
       * @param node        the {@link UaNode} the change originated from.
       * @param attributeId the {@link AttributeId} that changed.
       * @param value       the new value of the attribute.
       */
      void attributeChanged(UaNode node, AttributeId attributeId, Object value);
  
  }
  