Package org.apache.wayang.java.channels

Class CollectionChannel

java.lang.Object

org.apache.wayang.core.plan.executionplan.Channel

org.apache.wayang.java.channels.CollectionChannel

public class CollectionChannel
extends Channel

Channel between two JavaExecutionOperators using an intermediate Collection.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	CollectionChannel.Instance	JavaChannelInstance implementation for the CollectionChannel.

Field Summary

Fields

Modifier and Type	Field	Description
static ChannelDescriptor	DESCRIPTOR

Fields inherited from class org.apache.wayang.core.plan.executionplan.Channel

logger

Constructor Summary

Constructors

Constructor	Description
CollectionChannel(ChannelDescriptor channelDescriptor, OutputSlot<?> outputSlot)

Method Summary

Modifier and Type	Method	Description
CollectionChannel	copy()	Create a copy of this instance.
CollectionChannel.Instance	createInstance(Executor executor, OptimizationContext.OperatorContext producerOperatorContext, int producerOutputIndex)	Create a ChannelInstance for this instance.

Methods inherited from class org.apache.wayang.core.plan.executionplan.Channel

addConsumer, addSibling, getCardinalityEstimate, getConsumers, getCorrespondingSlots, getDataSetType, getDescriptor, getOriginal, getProducer, getProducerOperator, getProducerSlot, getSiblings, isBetweenStages, isCopy, isExecutionBreaker, isMarkedForInstrumentation, isReusable, isSuitableForBreakpoint, markForInstrumentation, mergeIntoOriginal, removeSiblings, removeSiblingsWhere, retain, toString, withSiblings

Methods inherited from class java.lang.Object

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

Field Detail

DESCRIPTOR

public static final ChannelDescriptor DESCRIPTOR

Constructor Detail

CollectionChannel

public CollectionChannel(ChannelDescriptor channelDescriptor,
                         OutputSlot<?> outputSlot)

Method Detail

copy

public CollectionChannel copy()

Description copied from class: Channel

Create a copy of this instance. Mimics everything apart from the consumers. Also delimits already executed ExecutionTasks and those that are not executed yet. Be careful when revising this invariant.

Specified by:

copy in class Channel

createInstance

public CollectionChannel.Instance createInstance(Executor executor,
                                                 OptimizationContext.OperatorContext producerOperatorContext,
                                                 int producerOutputIndex)

Description copied from class: Channel

Create a ChannelInstance for this instance.

Specified by:

createInstance in class Channel

Parameters:

executor - that manages the resource or null if none