org.apache.beam.sdk.extensions.ordered

Class OrderedEventProcessor<EventT,EventKeyT,ResultT,StateT extends MutableState<EventT,ResultT>>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<KV<EventKeyT,KV<java.lang.Long,EventT>>>,OrderedEventProcessorResult<EventKeyT,ResultT,EventT>>

org.apache.beam.sdk.extensions.ordered.OrderedEventProcessor<EventT,EventKeyT,ResultT,StateT>

Type Parameters:

EventT -

EventKeyT -

StateT -

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

public abstract class OrderedEventProcessor<EventT,EventKeyT,ResultT,StateT extends MutableState<EventT,ResultT>>
extends PTransform<PCollection<KV<EventKeyT,KV<java.lang.Long,EventT>>>,OrderedEventProcessorResult<EventKeyT,ResultT,EventT>>

Transform for processing ordered events. Events are grouped by the key and within each key they are applied according to the provided sequence. Events which arrive out of sequence are buffered and processed after all the missing events for a given key have arrived.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

annotations, displayData, name, resourceHints

Constructor Summary

Constructors

Constructor and Description
OrderedEventProcessor()

Method Summary

Modifier and Type	Method and Description
static <EventTypeT,EventKeyTypeT,ResultTypeT,StateTypeT extends MutableState<EventTypeT,ResultTypeT>> OrderedEventProcessor<EventTypeT,EventKeyTypeT,ResultTypeT,StateTypeT>	create(OrderedProcessingHandler<EventTypeT,EventKeyTypeT,StateTypeT,ResultTypeT> handler)
OrderedEventProcessorResult<EventKeyT,ResultT,EventT>	expand(PCollection<KV<EventKeyT,KV<java.lang.Long,EventT>>> input) Override this method to specify how this PTransform should be expanded on the given InputT.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Constructor Detail

OrderedEventProcessor

public OrderedEventProcessor()

Method Detail

create

public static <EventTypeT,EventKeyTypeT,ResultTypeT,StateTypeT extends MutableState<EventTypeT,ResultTypeT>> OrderedEventProcessor<EventTypeT,EventKeyTypeT,ResultTypeT,StateTypeT> create(OrderedProcessingHandler<EventTypeT,EventKeyTypeT,StateTypeT,ResultTypeT> handler)

expand

public OrderedEventProcessorResult<EventKeyT,ResultT,EventT> expand(PCollection<KV<EventKeyT,KV<java.lang.Long,EventT>>> input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PCollection<KV<EventKeyT,KV<java.lang.Long,EventT>>>,OrderedEventProcessorResult<EventKeyT,ResultT,EventT>>