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## org.apache.cayenne.access
Interface OperationObserver

All Superinterfaces:
  OperationHints

All Known Implementing Classes:
  DefaultOperationObserver, IteratedSelectObserver, QueryResult

    public interface OperationObserver

extends OperationHints

Defines a set of callback methods that allow `QueryEngine` to pass back query results and notify caller about exceptions.

Method Summary
`void` | `nextBatchCount(Query query, int[] resultCount)` Callback method invoked after a batch update is executed.
`void` | `nextCount(Query query, int resultCount)` Callback method invoked after an updating query is executed.
`void` | `nextGeneratedRows(Query query, ResultIterator keysIterator)` Callback method invoked after each batch of generated values is read during an update.
`void` | `nextGlobalException(Exception ex)` Callback method invoked on exceptions that are not tied to a specific query execution, such as JDBC connection exceptions, etc.
`void` | `nextQueryException(Query query, Exception ex)` Callback method invoked on exceptions that happen during an execution of a specific query.
`void` | `nextRows(Query query, List<?> dataRows)` Callback method invoked for each processed ResultSet.
`void` | `nextRows(Query q, ResultIterator it)` Callback method invoked for each opened ResultIterator.

Methods inherited from interface org.apache.cayenne.access.OperationHints
`isIteratedResult`

Method Detail

### nextCount

    void nextCount(Query query,
                   int resultCount)

  Callback method invoked after an updating query is executed.

### nextBatchCount

    void nextBatchCount(Query query,
                        int[] resultCount)

  Callback method invoked after a batch update is executed.

### nextRows

    void nextRows(Query query,
                  List<?> dataRows)

  Callback method invoked for each processed ResultSet.

  Since:
    3.0

### nextRows

    void nextRows(Query q,
                  ResultIterator it)

  Callback method invoked for each opened ResultIterator. If this observer requested results to be returned as a ResultIterator, this method is invoked instead of `nextRows(Query, List)`.

  Since:
    3.0

### nextGeneratedRows

    void nextGeneratedRows(Query query,
                           ResultIterator keysIterator)

  Callback method invoked after each batch of generated values is read during an update.

  Since:
    3.0

### nextQueryException

    void nextQueryException(Query query,
                            Exception ex)

  Callback method invoked on exceptions that happen during an execution of a specific query.

### nextGlobalException

    void nextGlobalException(Exception ex)

  Callback method invoked on exceptions that are not tied to a specific query execution, such as JDBC connection exceptions, etc.

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