code: package org.eclipse.milo.opcua.sdk.client.model.types.objects;
  
  import java.util.concurrent.CompletableFuture;
  
  import org.eclipse.milo.opcua.sdk.client.model.types.variables.PropertyType;
  import org.eclipse.milo.opcua.sdk.core.QualifiedProperty;
  import org.eclipse.milo.opcua.sdk.core.ValueRanks;
  import org.eclipse.milo.opcua.stack.core.UaException;
  import org.eclipse.milo.opcua.stack.core.types.builtin.ExpandedNodeId;
  import org.eclipse.milo.opcua.stack.core.types.builtin.StatusCode;
  
  public interface AuditUpdateStateEventType extends AuditUpdateMethodEventType {
      QualifiedProperty<Object> OLD_STATE_ID = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "OldStateId",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=24"),
          ValueRanks.Scalar,
          Object.class
      );
  
      QualifiedProperty<Object> NEW_STATE_ID = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "NewStateId",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=24"),
          ValueRanks.Scalar,
          Object.class
      );
  
      /**
       * Get the local value of the OldStateId Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the OldStateId Node.
       * @throws UaException if an error occurs creating or getting the OldStateId Node.
       */
      Object getOldStateId() throws UaException;
  
      /**
       * Set the local value of the OldStateId Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param oldStateId the local value to set for the OldStateId Node.
       * @throws UaException if an error occurs creating or getting the OldStateId Node.
       */
      void setOldStateId(Object oldStateId) throws UaException;
  
      /**
       * Read the value of the OldStateId Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link Object} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      Object readOldStateId() throws UaException;
  
      /**
       * Write a new value for the OldStateId Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param oldStateId the {@link Object} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeOldStateId(Object oldStateId) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readOldStateId()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<?> readOldStateIdAsync();
  
      /**
       * An asynchronous implementation of {@link #writeOldStateId(Object)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeOldStateIdAsync(Object oldStateId);
  
      /**
       * Get the OldStateId {@link PropertyType} Node, or {@code null} if it does not exist.
       * <p>
       * The Node is created when first accessed and cached for subsequent calls.
       *
       * @return the OldStateId {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getOldStateIdNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getOldStateIdNode()}.
       *
       * @return a CompletableFuture that completes successfully with the
       * ? extends PropertyType Node or completes exceptionally if an error occurs
       * creating or getting the Node.
       */
      CompletableFuture<? extends PropertyType> getOldStateIdNodeAsync();
  
      /**
       * Get the local value of the NewStateId Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the NewStateId Node.
       * @throws UaException if an error occurs creating or getting the NewStateId Node.
       */
      Object getNewStateId() throws UaException;
  
      /**
       * Set the local value of the NewStateId Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param newStateId the local value to set for the NewStateId Node.
       * @throws UaException if an error occurs creating or getting the NewStateId Node.
       */
      void setNewStateId(Object newStateId) throws UaException;
  
      /**
       * Read the value of the NewStateId Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link Object} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      Object readNewStateId() throws UaException;
  
      /**
       * Write a new value for the NewStateId Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param newStateId the {@link Object} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeNewStateId(Object newStateId) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readNewStateId()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<?> readNewStateIdAsync();
  
      /**
       * An asynchronous implementation of {@link #writeNewStateId(Object)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeNewStateIdAsync(Object newStateId);
  
      /**
       * Get the NewStateId {@link PropertyType} Node, or {@code null} if it does not exist.
       * <p>
       * The Node is created when first accessed and cached for subsequent calls.
       *
       * @return the NewStateId {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getNewStateIdNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getNewStateIdNode()}.
       *
       * @return a CompletableFuture that completes successfully with the
       * ? extends PropertyType Node or completes exceptionally if an error occurs
       * creating or getting the Node.
       */
      CompletableFuture<? extends PropertyType> getNewStateIdNodeAsync();
  }
  