| Package | Description | 
|---|---|
| org.apache.cayenne.access | Contains classes that make up Cayenne ORM stack. | 
| org.apache.cayenne.access.util | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | OperationObserverDefines a set of callback methods that allow  QueryEngineto pass back query
 results and notify caller about exceptions. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | DefaultOperationObserverSimple implementation of OperationObserver interface. | 
| class  | DoNothingOperationObserverA very simple observer that does nothing with provided data, and rethrows any
 reported exceptions. | 
| class  | IteratedSelectObserverOperationObserver that is used to track the execution of SelectQueries with
 results returned as ResultIterator. | 
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