org.apache.cayenne.access

## Interface OperationObserver

- All Superinterfaces:
    OperationHints
  All Known Implementing Classes:
    DefaultOperationObserver, DoNothingOperationObserver, IteratedSelectObserver

      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

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `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<?> keys, ObjectId idToUpdate)` 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<?> keys,
                                 ObjectId idToUpdate)

      Callback method invoked after each batch of generated values is read during an update.
      Since:
        4.0

    - #### 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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