org.apache.flink.runtime.operators.shipping

Class OutputEmitter<T>

java.lang.Object

org.apache.flink.runtime.operators.shipping.OutputEmitter<T>

All Implemented Interfaces:

ChannelSelector<SerializationDelegate<T>>

public class OutputEmitter<T>
extends Object
implements ChannelSelector<SerializationDelegate<T>>

Constructor Summary

Constructors

Constructor and Description
OutputEmitter() Creates a new channel selector that distributes data round robin.
OutputEmitter(ShipStrategyType strategy) Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...).
OutputEmitter(ShipStrategyType strategy, TypeComparator<T> comparator) Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...) and uses the supplied comparator to hash / compare records for partitioning them deterministically.
OutputEmitter(ShipStrategyType strategy, TypeComparator<T> comparator, DataDistribution distr) Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...) and uses the supplied comparator to hash / compare records for partitioning them deterministically.

Method Summary

Methods

Modifier and Type	Method and Description
int[]	selectChannels(SerializationDelegate<T> record, int numberOfChannels) Called to determine to which attached OutputChannel objects the given record shall be forwarded.

Methods inherited from class java.lang.Object

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

Constructor Detail

OutputEmitter

public OutputEmitter()

Creates a new channel selector that distributes data round robin.

OutputEmitter

public OutputEmitter(ShipStrategyType strategy)

Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...).

Parameters:

strategy - The distribution strategy to be used.

OutputEmitter

public OutputEmitter(ShipStrategyType strategy,
             TypeComparator<T> comparator)

Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...) and uses the supplied comparator to hash / compare records for partitioning them deterministically.

Parameters:

strategy - The distribution strategy to be used.

comparator - The comparator used to hash / compare the records.

OutputEmitter

public OutputEmitter(ShipStrategyType strategy,
             TypeComparator<T> comparator,
             DataDistribution distr)

Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...) and uses the supplied comparator to hash / compare records for partitioning them deterministically.

Parameters:

strategy - The distribution strategy to be used.

comparator - The comparator used to hash / compare the records.

distr - The distribution pattern used in the case of a range partitioning.

Method Detail

selectChannels

public final int[] selectChannels(SerializationDelegate<T> record,
                   int numberOfChannels)

Description copied from interface: ChannelSelector

Called to determine to which attached OutputChannel objects the given record shall be forwarded.

Specified by:

selectChannels in interface ChannelSelector<SerializationDelegate<T>>

Parameters:

record - the record to the determine the output channels for

numberOfChannels - the total number of output channels which are attached to respective output gate

Returns:

a (possibly empty) array of integer numbers which indicate the indices of the output channels through which the record shall be forwarded