org.eclipse.rdf4j.federated.evaluation.join

Class ParallelBoundJoinTask

java.lang.Object

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

org.eclipse.rdf4j.federated.evaluation.join.ParallelBoundJoinTask

All Implemented Interfaces:

ParallelTask<BindingSet>

public class ParallelBoundJoinTask
extends ParallelTaskBase<BindingSet>

A task implementation representing a bound join, see FederationEvalStrategy.evaluateBoundJoinStatementPattern(StatementTupleExpr, List) for further details on the evaluation process.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field and Description
protected List<BindingSet>	bindings
protected StatementTupleExpr	expr
protected ParallelExecutor<BindingSet>	joinControl
protected FederationEvalStrategy	strategy

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

scheduledFuture

Constructor Summary

Constructors

Constructor and Description
ParallelBoundJoinTask(ParallelExecutor<BindingSet> joinControl, FederationEvalStrategy strategy, StatementTupleExpr expr, List<BindingSet> bindings)

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

expr

protected final StatementTupleExpr expr

bindings

protected final List<BindingSet> bindings

joinControl

protected final ParallelExecutor<BindingSet> joinControl

Constructor Detail

ParallelBoundJoinTask

public ParallelBoundJoinTask(ParallelExecutor<BindingSet> joinControl,
                             FederationEvalStrategy strategy,
                             StatementTupleExpr expr,
                             List<BindingSet> bindings)

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