org.openrdf.query.algebra.evaluation.federation

Class FederatedServiceManager

java.lang.Object

org.openrdf.query.algebra.evaluation.federation.FederatedServiceManager

public class FederatedServiceManager
extends Object

The FederatedServiceManager 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). If there is no service for the specified url, a SPARQLFederatedService is created and registered for future use.

Note that this manager can be used to register custom FederatedService implementations to provide custom behavior for SERVICE evaluation.

The default behavior can be changed by extending from this class and setting the implementation class via setImplementationClass(Class). The new class must provide the default constructor.

Author:

Andreas Schwarte

Constructor Summary

Constructors

Constructor and Description
FederatedServiceManager()

Method Summary

Methods

Modifier and Type	Method and Description
static FederatedServiceManager	getInstance()
FederatedService	getService(String serviceUrl) Retrieve the FederatedService registered for serviceUrl.
void	registerService(String serviceUrl, FederatedService service) Register the specified service to evaluate SERVICE expressions for the given url.
static void	setImplementationClass(Class<? extends FederatedServiceManager> implementationClass)
void	unregisterAll()
void	unregisterService(String serviceUrl) Unregister a service registered to serviceURl

Methods inherited from class java.lang.Object

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

Constructor Detail

FederatedServiceManager

public FederatedServiceManager()

Method Detail

getInstance

public static FederatedServiceManager getInstance()

setImplementationClass

public static void setImplementationClass(Class<? extends FederatedServiceManager> implementationClass)

registerService

public void registerService(String serviceUrl,
                   FederatedService service)

Register the specified service to evaluate SERVICE expressions for the given url.

Parameters:

serviceUrl -

service -

unregisterService

public void unregisterService(String serviceUrl)

Unregister a service registered to serviceURl

Parameters:

serviceUrl -

getService

public FederatedService getService(String serviceUrl)
                            throws RepositoryException

Retrieve the FederatedService registered for serviceUrl. If there is no service registered for serviceUrl, a new SPARQLFederatedService is created and registered.

Parameters:

serviceUrl - locator for the federation service

Returns:

the FederatedService, created fresh if necessary

Throws:

RepositoryException

unregisterAll

public void unregisterAll()