Package com.hazelcast.jet.pipeline

Class AggregateBuilder1<T0>

  • Type Parameters:
    T0 - type of items in stage-0 (the one you obtained this builder from)
    public class AggregateBuilder1<T0>
extends java.lang.Object
    Offers a step-by-step API to build a pipeline stage that co-aggregates the data from several input stages. To obtain it, call BatchStage.aggregateBuilder() on the first stage you are co-aggregating and refer to that method's Javadoc for further details.

    Note: this is not a builder of AggregateOperation. If that's what you are looking for, go here.

    Since:
    Jet 3.0

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      <T> Tag<T> add​(BatchStage<T> stage)
      Adds another stage that will contribute its data to the aggregate operation to be performed.
      <R> BatchStage<R> build​(AggregateOperation<?,​R> aggrOp)
      Creates and returns a pipeline stage that performs the co-aggregation of pipeline stages registered with this builder object.
      Tag<T0> tag0()
      Returns the tag corresponding to the pipeline stage this builder was obtained from.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • tag0

        @Nonnull
public Tag<T0> tag0()
        Returns the tag corresponding to the pipeline stage this builder was obtained from. Use this tag to refer to this stage when building the AggregateOperation that you'll pass to build(aggrOp).

      • add

        @Nonnull
public <T> Tag<T> add​(@Nonnull
                      BatchStage<T> stage)
        Adds another stage that will contribute its data to the aggregate operation to be performed. Returns the tag you'll use to refer to this stage when building the AggregateOperation that you'll pass to build().

      • build

        @Nonnull
public <R> BatchStage<R> build​(@Nonnull
                               AggregateOperation<?,​R> aggrOp)
        Creates and returns a pipeline stage that performs the co-aggregation of pipeline stages registered with this builder object. The tags you register with the aggregate operation must match the tags you registered with this builder. Refer to the documentation on BatchStage.aggregateBuilder() for more details.
        Type Parameters:
        R - type of the output item
        Parameters:
        aggrOp - the aggregate operation to perform
        Returns:
        a new stage representing the co-aggregation