com.hazelcast.jet.pipeline

Class WindowAggregateBuilder<R0>

java.lang.Object

com.hazelcast.jet.pipeline.WindowAggregateBuilder<R0>

Type Parameters:

R0 - type of the aggregated result for stream-0

public class WindowAggregateBuilder<R0>
extends Object

Offers a step-by-step fluent API to build a pipeline stage that performs a windowed co-aggregation of the data from several input stages. To obtain it, call StageWithWindow.aggregateBuilder() on one of the stages to co-aggregate 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

Modifier and Type	Method and Description
<T,R> Tag<R>	add(StreamStage<T> stage, AggregateOperation1<? super T,?,? extends R> aggrOp) Adds another stage that will contribute its data to the aggregate operation to be performed.
StreamStage<WindowResult<ItemsByTag>>	build() Creates and returns a pipeline stage that performs a windowed co-aggregation of the stages registered with this builder object.
Tag<R0>	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<R0> 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,R> Tag<R> add(StreamStage<T> stage,
                                 AggregateOperation1<? super T,?,? extends R> aggrOp)

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 StreamStage<WindowResult<ItemsByTag>> build()

Creates and returns a pipeline stage that performs a windowed co-aggregation of the stages registered with this builder object. The composite aggregate operation places the results of the individual aggregate operations in an ItemsByTag.

Returns:

a new stage representing the cogroup-and-aggregate operation