org.apache.flink.runtime.io.network.partition

Class RoundRobinSubpartitionSelector<T>

java.lang.Object

org.apache.flink.runtime.io.network.partition.RoundRobinSubpartitionSelector<T>

All Implemented Interfaces:

SubpartitionSelector<T>

public class RoundRobinSubpartitionSelector<T>
extends Object
implements SubpartitionSelector<T>

A SubpartitionSelector that selects all subpartitions in round-robin order.

Constructor Summary

Constructors

Constructor and Description
RoundRobinSubpartitionSelector()

Method Summary

Modifier and Type	Method and Description
T	getNextSubpartitionToConsume() Returns the next subpartition to consume data.
boolean	isMoreSubpartitionSwitchable() Whether the invoker can get a different subpartition in the next invocation of SubpartitionSelector.getNextSubpartitionToConsume().
void	markLastConsumptionStatus(boolean isDataAvailable, boolean isPartialRecord) Records the status of the last consumption attempt on the subpartition returned by the last invocation of SubpartitionSelector.getNextSubpartitionToConsume().
boolean	notifyDataAvailable(T subpartition) Marks a subpartition as having data available.

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinSubpartitionSelector

public RoundRobinSubpartitionSelector()

Method Detail

notifyDataAvailable

public boolean notifyDataAvailable(T subpartition)

Description copied from interface: SubpartitionSelector

Marks a subpartition as having data available.

Specified by:

notifyDataAvailable in interface SubpartitionSelector<T>

Returns:

true if this selector did not already contain the subpartition.

getNextSubpartitionToConsume

public T getNextSubpartitionToConsume()

Description copied from interface: SubpartitionSelector

Returns the next subpartition to consume data.

Specified by:

getNextSubpartitionToConsume in interface SubpartitionSelector<T>

markLastConsumptionStatus

public void markLastConsumptionStatus(boolean isDataAvailable,
                                      boolean isPartialRecord)

Description copied from interface: SubpartitionSelector

Records the status of the last consumption attempt on the subpartition returned by the last invocation of SubpartitionSelector.getNextSubpartitionToConsume().

This method must be invoked every time a subpartition acquired from this class is consumed.

Specified by:

markLastConsumptionStatus in interface SubpartitionSelector<T>

Parameters:

isDataAvailable - whether the consumption returned a valid data.

isPartialRecord - whether the returned data contains partial record. Ignored if there was no data available.

isMoreSubpartitionSwitchable

public boolean isMoreSubpartitionSwitchable()

Description copied from interface: SubpartitionSelector

Whether the invoker can get a different subpartition in the next invocation of SubpartitionSelector.getNextSubpartitionToConsume().

Specified by:

isMoreSubpartitionSwitchable in interface SubpartitionSelector<T>