org.eclipse.rdf4j.sail.federation.evaluation

Class FederationStrategy

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.impl.StrictEvaluationStrategy

org.eclipse.rdf4j.sail.federation.evaluation.FederationStrategy

All Implemented Interfaces:

EvaluationStrategy, FederatedServiceResolver, FederatedServiceResolverClient, UUIDable

public class FederationStrategy
extends StrictEvaluationStrategy

Evaluates Join, LeftJoin and Union in parallel and only evaluate if OwnedTupleExpr is the given member.

Author:

James Leigh

See Also:

ParallelJoinCursor, ParallelLeftJoinCursor

Field Summary

Fields inherited from class org.eclipse.rdf4j.query.algebra.evaluation.impl.StrictEvaluationStrategy

dataset, serviceResolver, tripleSource

Constructor Summary

Constructors

Constructor and Description
FederationStrategy(Executor executor, TripleSource tripleSource, Dataset dataset, FederatedServiceResolver serviceManager)

Method Summary

Modifier and Type	Method and Description
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(Join join, BindingSet bindings)
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(LeftJoin leftJoin, BindingSet bindings)
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(NaryJoin join, BindingSet bindings)
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(TupleExpr expr, BindingSet bindings) Evaluates the tuple expression against the supplied triple source with the specified set of variable bindings as input.
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(Union union, BindingSet bindings)

Methods inherited from class org.eclipse.rdf4j.query.algebra.evaluation.impl.StrictEvaluationStrategy

evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, getLimit, getService, getUUID, getVarValue, getZeroLengthPathIterator, isReducedOrDistinct, isTrue, isUnbound, optimize, setFederatedServiceResolver, setOptimizerPipeline, setTrackResultSize, setTrackTime

Methods inherited from class java.lang.Object

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

Constructor Detail

FederationStrategy

public FederationStrategy(Executor executor,
                          TripleSource tripleSource,
                          Dataset dataset,
                          FederatedServiceResolver serviceManager)

Method Detail

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(TupleExpr expr,
                                                                        BindingSet bindings)
                                                                 throws QueryEvaluationException

Description copied from interface: EvaluationStrategy

Evaluates the tuple expression against the supplied triple source with the specified set of variable bindings as input.

Specified by:

evaluate in interface EvaluationStrategy

Overrides:

evaluate in class StrictEvaluationStrategy

Parameters:

expr - The Tuple Expression to evaluate

bindings - The variables bindings to use for evaluating the expression, if applicable.

Returns:

A closeable iterator over the variable binding sets that match the tuple expression.

Throws:

QueryEvaluationException

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(Join join,
                                                                        BindingSet bindings)
                                                                 throws QueryEvaluationException

Overrides:

evaluate in class StrictEvaluationStrategy

Throws:

QueryEvaluationException

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(NaryJoin join,
                                                                        BindingSet bindings)
                                                                 throws QueryEvaluationException

Throws:

QueryEvaluationException

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(LeftJoin leftJoin,
                                                                        BindingSet bindings)
                                                                 throws QueryEvaluationException

Overrides:

evaluate in class StrictEvaluationStrategy

Throws:

QueryEvaluationException

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(Union union,
                                                                        BindingSet bindings)
                                                                 throws QueryEvaluationException

Overrides:

evaluate in class StrictEvaluationStrategy

Throws:

QueryEvaluationException