| Class | Description | 
|---|---|
| DefaultOperationObserver | Simple implementation of OperationObserver interface. | 
| DoNothingOperationObserver | A very simple observer that does nothing with provided data, and rethrows any
 reported exceptions. | 
| IteratedSelectObserver | OperationObserver that is used to track the execution of SelectQueries with
 results returned as ResultIterator. | 
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