Class BulkIterationBase.TerminationCriterionMapper<X>

    • Constructor Detail

      • TerminationCriterionMapper

        public TerminationCriterionMapper()
    • Method Detail

      • open

        public void open​(OpenContext openContext)
        Description copied from interface: RichFunction
        Initialization method for the function. It is called before the actual working methods (like map or join) and thus suitable for one time setup work. For functions that are part of an iteration, this method will be invoked at the beginning of each iteration superstep.

        The openContext object passed to the function can be used for configuration and initialization. The openContext contains some necessary information that were configured on the function in the program composition.

        
         public class MyFilter extends RichFilterFunction<String> {
        
             private String searchString;
        
             public void open(OpenContext openContext) {
                 // initialize the value of searchString
             }
        
             public boolean filter(String value) {
                 return value.equals(searchString);
             }
         }
         
        Specified by:
        open in interface RichFunction
        Overrides:
        open in class AbstractRichFunction
        Parameters:
        openContext - The context containing information about the context in which the function is opened.
      • flatMap

        public void flatMap​(X in,
                            Collector<X> out)
        Description copied from interface: FlatMapFunction
        The core method of the FlatMapFunction. Takes an element from the input data set and transforms it into zero, one, or more elements.
        Specified by:
        flatMap in interface FlatMapFunction<X,​X>
        Parameters:
        in - The input value.
        out - The collector for returning result values.