io.prestosql.operator

Interface WorkProcessor.Transformation<T,R>

Enclosing interface:

WorkProcessor<T>

public static interface WorkProcessor.Transformation<T,R>

Method Summary

Modifier and Type	Method and Description
WorkProcessor.TransformationState<R>	process(T element) Processes input elements and returns current transformation state.

Method Detail

process

WorkProcessor.TransformationState<R> process(@Nullable
                                             T element)

Processes input elements and returns current transformation state.

Parameters:

element - an element to be transformed. Will be null when there are no more elements. In such case transformation should finish processing and flush any remaining data.

Returns:

the current transformation state, optionally bearing a result

See Also:

WorkProcessor.TransformationState.needsMoreData(), WorkProcessor.TransformationState.blocked(ListenableFuture), WorkProcessor.TransformationState.yield(), WorkProcessor.TransformationState.ofResult(Object), WorkProcessor.TransformationState.ofResult(Object, boolean), WorkProcessor.TransformationState.finished()