Package org.apache.geode.cache.query

Interface Aggregator

public interface Aggregator
Behavior of a user-defined aggregator. Aggregates values and returns a result. In addition to the methods in the interface, implementing classes must have a 0-arg public constructor.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    accumulate(Object value)
    Accumulate the next scalar value
    void
    init()
    Initialize the Aggregator
    Object
    terminate()
    Finish the aggregation and return the operation result.

  • Method Details

    • init

      void init()
      Initialize the Aggregator

    • accumulate

      void accumulate(Object value)
      Accumulate the next scalar value
      Parameters:
      value - the scalar value to accumulate

    • terminate

      Object terminate()
      Finish the aggregation and return the operation result.
      Returns:
      Return the result scalar value