Package org.eclipse.rdf4j.federated.structures

Class QueryInfo

java.lang.Object

org.eclipse.rdf4j.federated.structures.QueryInfo

public class QueryInfo
extends Object

Structure to maintain query information during evaluation, is attached to algebra nodes. Each instance is uniquely attached to the query.

The queryId can be used to abort tasks belonging to a particular evaluation.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	done
protected static final AtomicInteger	NEXT_QUERY_ID
protected Set<ParallelTask<?>>	scheduledSubtasks

Constructor Summary

Constructors

Constructor	Description
QueryInfo(String query, String baseURI, QueryType queryType, int maxExecutionTime, boolean includeInferred, FederationContext federationContext, FederationEvalStrategy strategy, Dataset dataset)
QueryInfo(Resource subj, IRI pred, Value obj, int maxExecutionTime, boolean includeInferred, FederationContext federationContext, FederationEvalStrategy strategy, Dataset dataset)

Method Summary

Modifier and Type	Method	Description
void	abort()	Mark the query as aborted and abort all scheduled (future) tasks known at this point in time.
protected void	abortScheduledTasks()	Abort any scheduled future tasks
void	close()	Close this query.
boolean	equals(Object obj)
String	getBaseURI()
Dataset	getDataset()
FederationContext	getFederationContext()
boolean	getIncludeInferred()
long	getMaxRemainingTimeMS()
String	getQuery()
BigInteger	getQueryID()
QueryType	getQueryType()
Optional<TupleQueryResultHandler>	getResultHandler()	Returns a TupleQueryResultHandler if this query is executed using.
FederationEvalStrategy	getStrategy()
int	hashCode()
void	registerScheduledTask(ParallelTask<?> task)	Register a new scheduled task for this query.
void	setResultHandler(TupleQueryResultHandler resultHandler)	Set the TupleQueryResultHandler if the query is executed using TupleQuery.evaluate(TupleQueryResultHandler) allowing for passing through results to the handler.

Methods inherited from class java.lang.Object

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

Field Details

NEXT_QUERY_ID

protected static final AtomicInteger NEXT_QUERY_ID

done

protected boolean done

scheduledSubtasks

protected Set<ParallelTask<?>> scheduledSubtasks

Constructor Details

QueryInfo

public QueryInfo(String query,
 String baseURI,
 QueryType queryType,
 int maxExecutionTime,
 boolean includeInferred,
 FederationContext federationContext,
 FederationEvalStrategy strategy,
 Dataset dataset)

Parameters:

query -

queryType -

maxExecutionTime - the maximum explicit query time in seconds, if 0 use FedXConfig.getEnforceMaxQueryTime()

includeInferred - whether to include inferred statements

federationContext - the FederationContext

dataset - the Dataset

QueryInfo

public QueryInfo(Resource subj,
 IRI pred,
 Value obj,
 int maxExecutionTime,
 boolean includeInferred,
 FederationContext federationContext,
 FederationEvalStrategy strategy,
 Dataset dataset)

Method Details

getQueryID

public BigInteger getQueryID()

getQuery

public String getQuery()

getQueryType

public QueryType getQueryType()

getIncludeInferred

public boolean getIncludeInferred()

getDataset

public Dataset getDataset()

getBaseURI

public String getBaseURI()

Returns:

the baseURI

getStrategy

public FederationEvalStrategy getStrategy()

Returns:

the FederationEvalStrategy active in the current query context

getFederationContext

public FederationContext getFederationContext()

Returns:

the FederationContext in which this query is executed

getMaxRemainingTimeMS

public long getMaxRemainingTimeMS()

Returns:

the maximum remaining time in ms until the query runs into a timeout. If negative, timeout has been reached

registerScheduledTask

public void registerScheduledTask(ParallelTask<?> task)
                           throws QueryEvaluationException

Register a new scheduled task for this query.

Parameters:

task -

Throws:

QueryEvaluationException - if the query has been aborted or closed

getResultHandler

public Optional<TupleQueryResultHandler> getResultHandler()

Returns a TupleQueryResultHandler if this query is executed using. TupleQuery.evaluate(TupleQueryResultHandler).

Returns:

the TupleQueryResultHandler that can be used for pass through

See Also:

• PassThroughTupleExpr

setResultHandler

public void setResultHandler(TupleQueryResultHandler resultHandler)

Set the TupleQueryResultHandler if the query is executed using TupleQuery.evaluate(TupleQueryResultHandler) allowing for passing through results to the handler.

Parameters:

resultHandler - the TupleQueryResultHandler

abort

public void abort()

Mark the query as aborted and abort all scheduled (future) tasks known at this point in time. Also do not accept any new scheduled tasks

close

public void close()

Close this query. If exists, all scheduled (future) tasks known at this point in time are aborted. Also do not accept any new scheduled tasks

abortScheduledTasks

protected void abortScheduledTasks()

Abort any scheduled future tasks

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object