org.eclipse.rdf4j.sail.inferencer.fc

Class DedupingInferencer

java.lang.Object

org.eclipse.rdf4j.sail.helpers.SailWrapper

org.eclipse.rdf4j.sail.helpers.NotifyingSailWrapper

org.eclipse.rdf4j.sail.inferencer.fc.DedupingInferencer

All Implemented Interfaces:

FederatedServiceResolverClient, NotifyingSail, Sail, StackableSail

public class DedupingInferencer
extends NotifyingSailWrapper

An inferencer may infer the same statement from two different statements. This leads to that single inferred statement undergoing inferencing multiple times, and all the statements inferred from it too, etc. This is mainly due to the use of SailConnectionListeners which don't distinguish between adding a new statement and one that already exists. Adding this inferencer to a Sail stack prevents this problem and gives a significant performance increase.

Constructor Summary

Constructors

Constructor and Description
DedupingInferencer()
DedupingInferencer(NotifyingSail baseSail)

Method Summary

Modifier and Type	Method and Description
InferencerConnection	getConnection() Opens a connection on the Sail which can be used to query and update data.

Methods inherited from class org.eclipse.rdf4j.sail.helpers.NotifyingSailWrapper

addSailChangedListener, getBaseSail, removeSailChangedListener, setBaseSail

Methods inherited from class org.eclipse.rdf4j.sail.helpers.SailWrapper

getDataDir, getDefaultIsolationLevel, getSupportedIsolationLevels, getValueFactory, initialize, isWritable, setDataDir, setFederatedServiceResolver, shutDown, verifyBaseSailSet

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.sail.Sail

getDataDir, getDefaultIsolationLevel, getSupportedIsolationLevels, getValueFactory, init, initialize, isWritable, setDataDir, shutDown

Constructor Detail

DedupingInferencer

public DedupingInferencer()

DedupingInferencer

public DedupingInferencer(NotifyingSail baseSail)

Method Detail

getConnection

public InferencerConnection getConnection()
                                   throws SailException

Description copied from interface: Sail

Opens a connection on the Sail which can be used to query and update data. Depending on how the implementation handles concurrent access, a call to this method might block when there is another open connection on this Sail.

Specified by:

getConnection in interface NotifyingSail

Specified by:

getConnection in interface Sail

Overrides:

getConnection in class NotifyingSailWrapper

Throws:

SailException - If no transaction could be started, for example because the Sail is not writable.