io.prestosql.operator

Class WorkProcessor.TransformationState<T>

java.lang.Object

io.prestosql.operator.WorkProcessor.TransformationState<T>

Enclosing interface:

WorkProcessor<T>

@Immutable
public static final class WorkProcessor.TransformationState<T>
extends Object

Method Summary

Modifier and Type	Method and Description
static <T> WorkProcessor.TransformationState<T>	blocked(com.google.common.util.concurrent.ListenableFuture<?> blocked) Signals that transformation is blocked.
static <T> WorkProcessor.TransformationState<T>	finished() Signals that transformation has finished.
static <T> WorkProcessor.TransformationState<T>	needsMoreData() Signals that transformation requires more data in order to continue and no result has been produced.
static <T> WorkProcessor.TransformationState<T>	ofResult(T result) Signals that transformation has produced a result from its input.
static <T> WorkProcessor.TransformationState<T>	ofResult(T result, boolean needsMoreData) Signals that transformation has produced a result.
static <T> WorkProcessor.TransformationState<T>	yield() Signals that transformation has yielded.

Methods inherited from class java.lang.Object

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

Method Detail

needsMoreData

public static <T> WorkProcessor.TransformationState<T> needsMoreData()

Signals that transformation requires more data in order to continue and no result has been produced. WorkProcessor.process() will be called with a new input element or with Optional.empty() if there are no more elements.

blocked

public static <T> WorkProcessor.TransformationState<T> blocked(com.google.common.util.concurrent.ListenableFuture<?> blocked)

Signals that transformation is blocked. WorkProcessor.process() will be called again with the same input element after blocked future is done.

yield

public static <T> WorkProcessor.TransformationState<T> yield()

Signals that transformation has yielded. WorkProcessor.process() will be called again with the same input element.

ofResult

public static <T> WorkProcessor.TransformationState<T> ofResult(T result)

Signals that transformation has produced a result from its input. WorkProcessor.process() will be called again with a new element or with Optional.empty() if there are no more elements.

ofResult

public static <T> WorkProcessor.TransformationState<T> ofResult(T result,
                                                                boolean needsMoreData)

Signals that transformation has produced a result. If needsMoreData, WorkProcessor.process() will be called again with a new element (or with Optional.empty() if there are no more elements). If not @{code needsMoreData}, WorkProcessor.process() will be called again with the same element.

finished

public static <T> WorkProcessor.TransformationState<T> finished()

Signals that transformation has finished. WorkProcessor.process() method will not be called again.