Package org.eclipse.rdf4j.federated.evaluation.iterator

Class StopRemainingExecutionsOnCloseIteration

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<BindingSet,QueryEvaluationException>

org.eclipse.rdf4j.federated.evaluation.iterator.StopRemainingExecutionsOnCloseIteration

All Implemented Interfaces:

AutoCloseable, CloseableIteration<BindingSet,QueryEvaluationException>, Iteration<BindingSet,QueryEvaluationException>

public class StopRemainingExecutionsOnCloseIteration
extends AbstractCloseableIteration<BindingSet,QueryEvaluationException>

A wrapping iteration that attempts to close all running scheduled Futures for the given query evaluation.

This is required for instance if the resulting iteration is not fully consumed.

Author:

Andreas Schwarte

See Also:

• QueryInfo.close()
• ParallelTask.cancel()

Field Summary

Fields

Modifier and Type	Field	Description
protected final CloseableIteration<? extends BindingSet,QueryEvaluationException>	inner
protected final QueryInfo	queryInfo

Constructor Summary

Constructors

Constructor	Description
StopRemainingExecutionsOnCloseIteration(CloseableIteration<? extends BindingSet,QueryEvaluationException> inner, QueryInfo queryInfo)

Method Summary

Modifier and Type	Method	Description
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.
boolean	hasNext()	Returns true if the iteration has more elements.
BindingSet	next()	Returns the next element in the iteration.
void	remove()	Removes from the underlying collection the last element returned by the iteration (optional operation).

Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration

close, isClosed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration

stream

Field Details

inner

protected final CloseableIteration<? extends BindingSet,QueryEvaluationException> inner

queryInfo

protected final QueryInfo queryInfo

Constructor Details

StopRemainingExecutionsOnCloseIteration

public StopRemainingExecutionsOnCloseIteration(CloseableIteration<? extends BindingSet,QueryEvaluationException> inner,
 QueryInfo queryInfo)

Method Details

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns true if the iteration has more elements. (In other words, returns true if Iteration.next() would return an element rather than throwing a NoSuchElementException.)

Returns:

true if the iteration has more elements.

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns the next element in the iteration.

Returns:

the next element in the iteration.

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

Description copied from interface: Iteration

Removes from the underlying collection the last element returned by the iteration (optional operation). This method can be called only once per call to next.

Throws:

QueryEvaluationException

handleClose

protected void handleClose()
                    throws QueryEvaluationException

Description copied from class: AbstractCloseableIteration

Called by AbstractCloseableIteration.close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.

Overrides:

handleClose in class AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException