org.eclipse.rdf4j.federated.evaluation.join

Class ParallelLeftJoinTask

java.lang.Object

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

org.eclipse.rdf4j.federated.evaluation.join.ParallelLeftJoinTask

All Implemented Interfaces:

ParallelTask<BindingSet>

public class ParallelLeftJoinTask
extends ParallelTaskBase<BindingSet>

A task implementation representing a join, i.e. the provided expression is evaluated with the given bindings.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field and Description
protected LeftJoin	join
protected ParallelExecutor<BindingSet>	joinControl
protected BindingSet	leftBindings
protected FederationEvalStrategy	strategy

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

scheduledFuture

Constructor Summary

Constructors

Constructor and Description
ParallelLeftJoinTask(ParallelExecutor<BindingSet> joinControl, FederationEvalStrategy strategy, LeftJoin join, BindingSet leftBindings)

Method Summary

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

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

cancel, 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

strategy

protected final FederationEvalStrategy strategy

join

protected final LeftJoin join

leftBindings

protected final BindingSet leftBindings

joinControl

protected final ParallelExecutor<BindingSet> joinControl

Constructor Detail

ParallelLeftJoinTask

public ParallelLeftJoinTask(ParallelExecutor<BindingSet> joinControl,
                            FederationEvalStrategy strategy,
                            LeftJoin join,
                            BindingSet leftBindings)

Method Detail

performTask

public CloseableIteration<BindingSet,QueryEvaluationException> performTask()
                                                                    throws Exception

Throws:

Exception

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