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;
  import org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.UShort;
  
  public interface ProgressEventType extends BaseEventType {
      QualifiedProperty<Object> CONTEXT = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "Context",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=24"),
          ValueRanks.Scalar,
          Object.class
      );
  
      QualifiedProperty<UShort> PROGRESS = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "Progress",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=5"),
          ValueRanks.Scalar,
          UShort.class
      );
  
      /**
       * Get the local value of the Context Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the Context Node.
       * @throws UaException if an error occurs creating or getting the Context Node.
       */
      Object getContext() throws UaException;
  
      /**
       * Set the local value of the Context Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param context the local value to set for the Context Node.
       * @throws UaException if an error occurs creating or getting the Context Node.
       */
      void setContext(Object context) throws UaException;
  
      /**
       * Read the value of the Context 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 readContext() throws UaException;
  
      /**
       * Write a new value for the Context Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param context the {@link Object} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeContext(Object context) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readContext()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<?> readContextAsync();
  
      /**
       * An asynchronous implementation of {@link #writeContext(Object)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeContextAsync(Object context);
  
      /**
       * Get the Context {@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 Context {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getContextNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getContextNode()}.
       *
       * @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> getContextNodeAsync();
  
      /**
       * Get the local value of the Progress Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the Progress Node.
       * @throws UaException if an error occurs creating or getting the Progress Node.
       */
      UShort getProgress() throws UaException;
  
      /**
       * Set the local value of the Progress Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param progress the local value to set for the Progress Node.
       * @throws UaException if an error occurs creating or getting the Progress Node.
       */
      void setProgress(UShort progress) throws UaException;
  
      /**
       * Read the value of the Progress Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link UShort} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      UShort readProgress() throws UaException;
  
      /**
       * Write a new value for the Progress Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param progress the {@link UShort} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeProgress(UShort progress) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readProgress()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends UShort> readProgressAsync();
  
      /**
       * An asynchronous implementation of {@link #writeProgress(UShort)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeProgressAsync(UShort progress);
  
      /**
       * Get the Progress {@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 Progress {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getProgressNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getProgressNode()}.
       *
       * @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> getProgressNodeAsync();
  }
  