org.apache.flink.runtime.io.network.api.writer

Class RoundRobinChannelSelector<T extends org.apache.flink.core.io.IOReadableWritable>

java.lang.Object

org.apache.flink.runtime.io.network.api.writer.RoundRobinChannelSelector<T>

Type Parameters:

T - the type of record which is sent through the attached output gate

All Implemented Interfaces:

ChannelSelector<T>

public class RoundRobinChannelSelector<T extends org.apache.flink.core.io.IOReadableWritable>
extends Object
implements ChannelSelector<T>

This is the default implementation of the ChannelSelector interface. It represents a simple round-robin strategy, i.e. regardless of the record every attached exactly one output channel is selected at a time.

Constructor Summary

Constructors

Constructor and Description
RoundRobinChannelSelector() Constructs a new default channel selector.

Method Summary

Modifier and Type	Method and Description
int[]	selectChannels(T record, int numberOfOutputChannels) Returns the logical channel indexes, to which the given record should be written.

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinChannelSelector

public RoundRobinChannelSelector()

Constructs a new default channel selector.

Method Detail

selectChannels

public int[] selectChannels(T record,
                            int numberOfOutputChannels)

Description copied from interface: ChannelSelector

Returns the logical channel indexes, to which the given record should be written.

Specified by:

selectChannels in interface ChannelSelector<T extends org.apache.flink.core.io.IOReadableWritable>

Parameters:

record - the record to the determine the output channels for

numberOfOutputChannels - 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