net.fortytwo.stream.sparql.impl.caching

Class CachingSparqlStreamProcessor

java.lang.Object

net.fortytwo.stream.BasicStreamProcessor<String,C,Q,org.openrdf.model.Statement,org.openrdf.query.BindingSet>

net.fortytwo.stream.sparql.RDFStreamProcessor<SparqlQuery,Q>

net.fortytwo.stream.sparql.SparqlStreamProcessor<Query<org.openrdf.model.Value,?>>

net.fortytwo.stream.sparql.impl.caching.CachingSparqlStreamProcessor

All Implemented Interfaces:

StreamProcessor<String,org.openrdf.model.Statement,org.openrdf.query.BindingSet>

public class CachingSparqlStreamProcessor
extends SparqlStreamProcessor<Query<org.openrdf.model.Value,?>>

Concrete implementation of a SesameStream continuous SPARQL query engine which materializes and caches intermediate solutions. For a more space-efficient implementation, see SHJSparqlQueryEngine.

Author:

Joshua Shinavier (http://fortytwo.net)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	CachingSparqlStreamProcessor.CleanupPolicy A policy for removing expired solutions from a query engine

Nested classes/interfaces inherited from class net.fortytwo.stream.sparql.RDFStreamProcessor

RDFStreamProcessor.Counter, RDFStreamProcessor.Quantity

Nested classes/interfaces inherited from interface net.fortytwo.stream.StreamProcessor

StreamProcessor.IncompatibleQueryException, StreamProcessor.InvalidQueryException

Field Summary

Fields inherited from class net.fortytwo.stream.sparql.RDFStreamProcessor

logger

Fields inherited from interface net.fortytwo.stream.StreamProcessor

INFINITE_TTL, NEVER_EXPIRE

Constructor Summary

Constructors

Constructor and Description
CachingSparqlStreamProcessor() Creates a new query engine with an empty index

Method Summary

Modifier and Type	Method and Description
protected boolean	addTupleInternal(org.openrdf.model.Value[] tuple, int ttl, long now)
void	clear()
protected BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet>	createSubscriptionInternal(SparqlQuery sparqlQuery, List<VariableOrConstant<String,org.openrdf.model.Value>[]> patterns, long expirationTime, java.util.function.BiConsumer<org.openrdf.query.BindingSet,Long> consumer)
protected void	register(BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet> subscription)
boolean	renew(BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet> subscription, int ttl)
void	setCleanupPolicy(CachingSparqlStreamProcessor.CleanupPolicy cleanupPolicy) Sets a policy for removing expired solutions from this query engine.
void	shutDown()
void	unregister(BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet> subscription)
protected void	visitQueryPatterns(Query<org.openrdf.model.Value,?> query, java.util.function.Consumer<VariableOrConstant<String,org.openrdf.model.Value>[]> visitor)

Methods inherited from class net.fortytwo.stream.sparql.SparqlStreamProcessor

addQuery, addTuple, createRDFHandler, createSubscription, getReducedModifierCapacity, handleCandidateSolution, parseQuery, setLinkedDataCache, setReducedModifierCapacity

Methods inherited from class net.fortytwo.stream.sparql.RDFStreamProcessor

addInputs, addQuery, addQueryNative, beginOperation, clearCounters, get, getNow, handleSolution, increment, incrementQueries, incrementSolutions, incrementStatements, isActive, logEntry, logHeader, setClock, setDoPerformanceMetrics, setDoUseCompactLogFormat, toExpirationTime

Methods inherited from class java.lang.Object

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

Constructor Detail

CachingSparqlStreamProcessor

public CachingSparqlStreamProcessor()

Creates a new query engine with an empty index

Method Detail

setCleanupPolicy

public void setCleanupPolicy(CachingSparqlStreamProcessor.CleanupPolicy cleanupPolicy)

Sets a policy for removing expired solutions from this query engine. The policy is triggered after every query or set of statements is added to the query engine.

Parameters:

cleanupPolicy - a policy which determines when a cleanup operation is executed. The default policy executes every 30 seconds, provided that new statements are added.

clear

public void clear()

shutDown

public void shutDown()

Overrides:

shutDown in class RDFStreamProcessor<SparqlQuery,Query<org.openrdf.model.Value,?>>

unregister

public void unregister(BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet> subscription)

Specified by:

unregister in class BasicStreamProcessor<String,SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.model.Statement,org.openrdf.query.BindingSet>

renew

public boolean renew(BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet> subscription,
                     int ttl)

Specified by:

renew in class BasicStreamProcessor<String,SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.model.Statement,org.openrdf.query.BindingSet>

visitQueryPatterns

protected void visitQueryPatterns(Query<org.openrdf.model.Value,?> query,
                                  java.util.function.Consumer<VariableOrConstant<String,org.openrdf.model.Value>[]> visitor)

Specified by:

visitQueryPatterns in class SparqlStreamProcessor<Query<org.openrdf.model.Value,?>>

register

protected void register(BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet> subscription)

Specified by:

register in class SparqlStreamProcessor<Query<org.openrdf.model.Value,?>>

addTupleInternal

protected boolean addTupleInternal(org.openrdf.model.Value[] tuple,
                                   int ttl,
                                   long now)

Specified by:

addTupleInternal in class SparqlStreamProcessor<Query<org.openrdf.model.Value,?>>

createSubscriptionInternal

protected BasicSubscription<SparqlQuery,Query<org.openrdf.model.Value,?>,org.openrdf.query.BindingSet> createSubscriptionInternal(SparqlQuery sparqlQuery,
                                                                                                                                  List<VariableOrConstant<String,org.openrdf.model.Value>[]> patterns,
                                                                                                                                  long expirationTime,
                                                                                                                                  java.util.function.BiConsumer<org.openrdf.query.BindingSet,Long> consumer)

Specified by:

createSubscriptionInternal in class SparqlStreamProcessor<Query<org.openrdf.model.Value,?>>