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

Interface ChannelSelector<T extends IOReadableWritable>

Type Parameters:

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

All Known Implementing Classes:

OutputEmitter, RecordOutputEmitter, RoundRobinChannelSelector

public interface ChannelSelector<T extends IOReadableWritable>

Objects implementing this interface are passed to an OutputGate. When a record is sent through the output gate, the channel selector object is called to determine to which OutputChannel objects the record shall be passed on.

Method Summary

Methods

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

Method Detail

selectChannels

int[] selectChannels(T record,
                   int numberOfOutputChannels)

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

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