org.apache.flink.runtime.io

Interface NullableAsyncDataInput<T>

All Superinterfaces:

AvailabilityListener

@Internal
public interface NullableAsyncDataInput<T>
extends AvailabilityListener

The variant of AsyncDataInput that for performance reasons returns null from pollNextNullable() instead returning Optional.empty() from AsyncDataInput.pollNext().

Field Summary

Fields inherited from interface org.apache.flink.runtime.io.AvailabilityListener

AVAILABLE

Method Summary

Modifier and Type	Method and Description
T	pollNextNullable() Poll the next element.

Methods inherited from interface org.apache.flink.runtime.io.AvailabilityListener

isAvailable, isFinished

Method Detail

pollNextNullable

@Nullable
T pollNextNullable()
                      throws Exception

Poll the next element. This method should be non blocking.

Returns:

null will be returned if there is no data to return or if AvailabilityListener.isFinished() returns true. Otherwise return element.

Throws:

Exception