Package org.eclipse.rdf4j.query.algebra.evaluation.federation

Interface FederatedServiceResolver

All Known Subinterfaces:
EvaluationStrategy
All Known Implementing Classes:
AbstractFederatedServiceResolver, DefaultEvaluationStrategy, DelegateFederatedServiceResolver, ExtendedEvaluationStrategy, FederationEvalStrategy, SailFederationEvalStrategy, SparqlFederationEvalStrategy, SPARQLServiceResolver, StrictEvaluationStrategy, TupleFunctionEvaluationStrategy
public interface FederatedServiceResolver
The FederatedServiceResolver is used to manage a set of FederatedService instances, which are used to evaluate SERVICE expressions for particular service Urls.

Lookup can be done via the serviceUrl using the method getService(String).

Author:
Andreas Schwarte, James Leigh

  • Method Details

    • getService

      FederatedService getService(String serviceUrl) throws QueryEvaluationException
      Retrieve the FederatedService registered for serviceUrl. If there is no service registered for serviceUrl, a new
      invalid reference 
      org.eclipse.rdf4j.query.algebra.evaluation.federation.SPARQLFederatedService
      is created and registered.
      Parameters:
      serviceUrl - locator for the federation service
      Returns:
      the FederatedService, created fresh if necessary
      Throws:
      QueryEvaluationException - If there was an exception generated while retrieving the service.