# Uses of Interface
org.apache.cayenne.access.OperationHints

Packages that use OperationHints
Package
Description
org.apache.cayenne.access
Contains classes that make up Cayenne ORM stack.
org.apache.cayenne.access.util

- ## Uses of OperationHints in org.apache.cayenne.access

  Subinterfaces of OperationHints in org.apache.cayenne.access
  Modifier and Type
  Interface
  Description
  `interface`
  `OperationObserver`
  Defines a set of callback methods that allow `QueryEngine` to pass back query results and notify caller about exceptions.

- ## Uses of OperationHints in org.apache.cayenne.access.util

  Classes in org.apache.cayenne.access.util that implement OperationHints
  Modifier and Type
  Class
  Description
  `class`
  `DefaultOperationObserver`
  Simple implementation of OperationObserver interface.
  `class`
  `DoNothingOperationObserver`
  A very simple observer that does nothing with provided data, and rethrows any reported exceptions.
  `class`
  `IteratedSelectObserver`
  OperationObserver that is used to track the execution of SelectQueries with results returned as ResultIterator.