Package net.sansa_stack.hadoop.core

Interface Accumulating<T,G,A,U>

Type Parameters:
T - The item type
G - The group key type - items are mapped to group keys
A - The accumulator type
U - The 'finalizer' - maps an accumulator to a final value
All Known Implementing Classes:
RecordReaderRdfTrigDataset.AccumulatingDataset
public interface Accumulating<T,G,A,U>

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    accumulate(A accumulator, T item)
     
    U
    accumulatedValue(A accumulator)
     
    G
    classify(T item)
     
    A
    createAccumulator(G groupKey)
     
    static <T> Accumulating
    identity()
    Identity accumulator - turns each item into a group that contains only the item and whose value is the item

  • Method Details

    • classify

      G classify(T item)

    • createAccumulator

      A createAccumulator(G groupKey)

    • accumulate

      void accumulate(A accumulator, T item)

    • accumulatedValue

      U accumulatedValue(A accumulator)

    • identity

      static <T> Accumulating identity()
      Identity accumulator - turns each item into a group that contains only the item and whose value is the item
      Type Parameters:
      T -
      Returns: