Package org.eclipse.rdf4j.federated.evaluation.union

Class ParallelUnionOperatorTask

java.lang.Object

org.eclipse.rdf4j.federated.evaluation.concurrent.ParallelTaskBase<BindingSet>

org.eclipse.rdf4j.federated.evaluation.union.ParallelUnionOperatorTask

All Implemented Interfaces:

ParallelTask<BindingSet>

public class ParallelUnionOperatorTask
extends ParallelTaskBase<BindingSet>

A task implementation representing a UNION operator expression to be evaluated.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field	Description
protected BindingSet	bindings
protected QueryEvaluationStep	expr
protected ParallelExecutor<BindingSet>	unionControl

Fields inherited from class org.eclipse.rdf4j.federated.evaluation.concurrent.ParallelTaskBase

scheduledFuture

Constructor Summary

Constructors

Constructor	Description
ParallelUnionOperatorTask(ParallelExecutor<BindingSet> unionControl, QueryEvaluationStep expr, BindingSet bindings)

Method Summary

Modifier and Type	Method	Description
ParallelExecutor<BindingSet>	getControl()	return the controlling instance, e.g.
protected CloseableIteration<BindingSet,QueryEvaluationException>	performTaskInternal()

Methods inherited from class org.eclipse.rdf4j.federated.evaluation.concurrent.ParallelTaskBase

cancel, close, performTask, setScheduledFuture, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.federated.evaluation.concurrent.ParallelTask

getQueryInfo

Field Detail

unionControl

protected final ParallelExecutor<BindingSet> unionControl

expr

protected final QueryEvaluationStep expr

bindings

protected final BindingSet bindings

Constructor Detail

ParallelUnionOperatorTask

public ParallelUnionOperatorTask(ParallelExecutor<BindingSet> unionControl,
                                 QueryEvaluationStep expr,
                                 BindingSet bindings)

Method Detail

getControl

public ParallelExecutor<BindingSet> getControl()

Description copied from interface: ParallelTask

return the controlling instance, e.g. in most cases the instance of a thread. Shared variables are used to inform the thread about new events.

Returns:

the control executor

performTaskInternal

protected CloseableIteration<BindingSet,QueryEvaluationException> performTaskInternal()
                                                                                     throws Exception

Specified by:

performTaskInternal in class ParallelTaskBase<BindingSet>

Throws:

Exception