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	Description
DedupingInferencer()
DedupingInferencer(NotifyingSail baseSail)

Method Summary

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

Methods inherited from class NotifyingSailWrapper

addSailChangedListener, getBaseSail, removeSailChangedListener, setBaseSail

Modifier and Type	Method	Description
void	addSailChangedListener(SailChangedListener listener)	Adds the specified SailChangedListener to receive events when the data in this Sail object changes.
NotifyingSail	getBaseSail()	Gets the base Sail that this Sail works on top of.
void	removeSailChangedListener(SailChangedListener listener)	Removes the specified SailChangedListener so that it no longer receives events from this Sail object.
void	setBaseSail(Sail baseSail)	Sets the base Sail that this Sail will work on top of.

Methods inherited from class SailWrapper

getCollectionFactory, getDataDir, getDefaultIsolationLevel, getFederatedServiceResolver, getSupportedIsolationLevels, getValueFactory, init, isWritable, setDataDir, setFederatedServiceResolver, shutDown, verifyBaseSailSet

Modifier and Type	Method	Description
Supplier<CollectionFactory>	getCollectionFactory()	Gets a CollectionFactory that may be optimized for this store and may or may not use disk or other resources.
File	getDataDir()	Gets the Sail's data directory.
IsolationLevel	getDefaultIsolationLevel()	Retrieves the default IsolationLevel level on which transactions in this Sail operate.
FederatedServiceResolver	getFederatedServiceResolver()	Gets the FederatedServiceResolver used by this client.
List<IsolationLevel>	getSupportedIsolationLevels()	Retrieve the IsolationLevels supported by this SAIL, ordered by increasing complexity.
ValueFactory	getValueFactory()	Gets a ValueFactory object that can be used to create IRI-, blank node-, literal- and statement objects.
void	init()	Initializes the Sail.
boolean	isWritable()	Checks whether this Sail object is writable, i.e. if the data contained in this Sail object can be changed.
void	setDataDir(File dataDir)	Sets the data directory for the Sail.
void	setFederatedServiceResolver(FederatedServiceResolver resolver)	Sets the FederatedServiceResolver to use for this client.
void	shutDown()	Shuts down the Sail, giving it the opportunity to synchronize any stale data.
protected void	verifyBaseSailSet()

Methods inherited from class Object

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

Constructor Details

DedupingInferencer

public DedupingInferencer()

DedupingInferencer

public DedupingInferencer(NotifyingSail baseSail)

Method Details

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.