Package weka.experiment

Interface ResultListener

All Superinterfaces:
Serializable
All Known Implementing Classes:
AveragingResultProducer, CSVResultListener, DatabaseResultListener, DatabaseResultProducer, InstancesResultListener, LearningRateResultProducer
public interface ResultListener extends Serializable
Interface for objects able to listen for results obtained by a ResultProducer
Version:
$Revision: 8034 $
Author:
Len Trigg (trigg@cs.waikato.ac.nz)

  • Method Details

    • determineColumnConstraints

      String[] determineColumnConstraints(ResultProducer rp) throws Exception
      Determines if there are any constraints (imposed by the destination) on additional result columns to be produced by resultProducers. Null should be returned if there are NO constraints, otherwise a list of column names should be returned as an array of Strings.
      Parameters:
      rp - the ResultProducer to which the constraints will apply
      Returns:
      an array of column names to which resutltProducer's additional results will be restricted.
      Throws:
      Exception - if an error occurs

    • preProcess

      void preProcess(ResultProducer rp) throws Exception
      Prepare for the results to be received.
      Parameters:
      rp - the ResultProducer that will generate the results
      Throws:
      Exception - if an error occurs during preprocessing.

    • postProcess

      void postProcess(ResultProducer rp) throws Exception
      Perform any postprocessing. When this method is called, it indicates that no more results will be sent that need to be grouped together in any way.
      Parameters:
      rp - the ResultProducer that generated the results
      Throws:
      Exception - if an error occurs

    • acceptResult

      void acceptResult(ResultProducer rp, Object[] key, Object[] result) throws Exception
      Accepts results from a ResultProducer.
      Parameters:
      rp - the ResultProducer that generated the results
      key - an array of Objects (Strings or Doubles) that uniquely identify a result for a given ResultProducer with given compatibilityState
      result - the results stored in an array. The objects stored in the array may be Strings, Doubles, or null (for the missing value).
      Throws:
      Exception - if the result could not be accepted.

    • isResultRequired

      boolean isResultRequired(ResultProducer rp, Object[] key) throws Exception
      Determines whether the results for a specified key must be generated.
      Parameters:
      rp - the ResultProducer wanting to generate the results
      key - an array of Objects (Strings or Doubles) that uniquely identify a result for a given ResultProducer with given compatibilityState
      Returns:
      true if the result should be generated
      Throws:
      Exception - if it could not be determined if the result is needed.