Class ControlledWorkerBoundJoin

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<BindingSet>

org.eclipse.rdf4j.common.iteration.LookAheadIteration<BindingSet>

org.eclipse.rdf4j.federated.evaluation.concurrent.ParallelExecutorBase<BindingSet>

org.eclipse.rdf4j.federated.evaluation.join.JoinExecutorBase<BindingSet>

org.eclipse.rdf4j.federated.evaluation.join.ControlledWorkerJoin

org.eclipse.rdf4j.federated.evaluation.join.ControlledWorkerBoundJoin

All Implemented Interfaces:

AutoCloseable, Runnable, Iterator<BindingSet>, CloseableIteration<BindingSet>, ParallelExecutor<BindingSet>

@Deprecated(forRemoval=true)
public class ControlledWorkerBoundJoin
extends ControlledWorkerJoin

Deprecated, for removal: This API element is subject to removal in a future version.

replaced with ControlledWorkerBindJoinl

Execute the nested loop join in an asynchronous fashion, using grouped requests, i.e. group bindings into one SPARQL request using a VALUES clause. The number of concurrent threads is controlled by a ControlledWorkerScheduler which works according to the FIFO principle and uses worker threads. This join cursor blocks until all scheduled tasks are finished, however the result iteration can be accessed from different threads to allow for pipelining.

Author:

Andreas Schwarte

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	ControlledWorkerBoundJoin.BoundJoinTaskCreator	Deprecated, for removal: This API element is subject to removal in a future version.
protected class	ControlledWorkerBoundJoin.CheckJoinTaskCreator	Deprecated, for removal: This API element is subject to removal in a future version.
protected class	ControlledWorkerBoundJoin.FedXServiceJoinTaskCreator	Deprecated, for removal: This API element is subject to removal in a future version.
protected static interface	ControlledWorkerBoundJoin.TaskCreator	Deprecated, for removal: This API element is subject to removal in a future version.

Field Summary

Fields inherited from class org.eclipse.rdf4j.federated.evaluation.join.ControlledWorkerJoin

phaser, scheduler

Fields inherited from class org.eclipse.rdf4j.federated.evaluation.join.JoinExecutorBase

bindings, joinVars, leftIter, rightArg

Fields inherited from class org.eclipse.rdf4j.federated.evaluation.concurrent.ParallelExecutorBase

evaluationThread, executorId, finished, NEXT_EXECUTOR_ID, queryInfo, rightIter, rightQueue, strategy

Constructor Summary

Constructors

Constructor	Description
ControlledWorkerBoundJoin(ControlledWorkerScheduler<BindingSet> scheduler, FederationEvalStrategy strategy, CloseableIteration<BindingSet> leftIter, TupleExpr rightArg, BindingSet bindings, QueryInfo queryInfo)	Deprecated, for removal: This API element is subject to removal in a future version.

Method Summary

Modifier and Type	Method	Description
protected ControlledWorkerBoundJoin.TaskCreator	determineTaskCreator(TupleExpr expr, BindingSet bs)	Deprecated, for removal: This API element is subject to removal in a future version.
protected int	getNextBindJoinSize(int configuredBindJoinSize, int totalBindings)	Deprecated, for removal: This API element is subject to removal in a future version. Return the size of the next bind join block.
protected void	handleBindings()	Deprecated, for removal: This API element is subject to removal in a future version. Implementations must implement this method to handle bindings.
void	handleClose()	Deprecated, for removal: This API element is subject to removal in a future version. Called by AbstractCloseableIteration.close() when it is called for the first time.
protected void	setSubmitFirstResultImmediately(boolean flag)	Deprecated, for removal: This API element is subject to removal in a future version.

Methods inherited from class org.eclipse.rdf4j.federated.evaluation.join.JoinExecutorBase

getExecutorType, getJoinVars, performExecution, setJoinVars

Methods inherited from class org.eclipse.rdf4j.federated.evaluation.concurrent.ParallelExecutorBase

addResult, checkTimeout, done, getDisplayId, getId, getNextElement, getQueryInfo, isFinished, run, toss, toString

Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration

hasNext, next, remove

Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration

close, isClosed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration

stream

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Details

ControlledWorkerBoundJoin

public ControlledWorkerBoundJoin(ControlledWorkerScheduler<BindingSet> scheduler,
 FederationEvalStrategy strategy,
 CloseableIteration<BindingSet> leftIter,
 TupleExpr rightArg,
 BindingSet bindings,
 QueryInfo queryInfo)
                          throws QueryEvaluationException

Deprecated, for removal: This API element is subject to removal in a future version.

Throws:

QueryEvaluationException

Method Details

setSubmitFirstResultImmediately

protected void setSubmitFirstResultImmediately(boolean flag)

Deprecated, for removal: This API element is subject to removal in a future version.

handleBindings

protected void handleBindings()
                       throws Exception

Deprecated, for removal: This API element is subject to removal in a future version.

Description copied from class: JoinExecutorBase

Implementations must implement this method to handle bindings. Use the following as a template while (!closed invalid input: '&'invalid input: '&' leftIter.hasNext()) { // your code } and add results to rightQueue. Note that addResult() is implemented synchronized and thus thread safe. In case you can guarantee sequential access, it is also possible to directly access rightQueue Note that the implementation must block until the entire join is executed.

Overrides:

handleBindings in class ControlledWorkerJoin

Throws:

Exception

handleClose

public void handleClose()
                 throws QueryEvaluationException

Deprecated, for removal: This API element is subject to removal in a future version.

Description copied from class: AbstractCloseableIteration

Called by AbstractCloseableIteration.close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.

Overrides:

handleClose in class ControlledWorkerJoin

Throws:

QueryEvaluationException

determineTaskCreator

protected ControlledWorkerBoundJoin.TaskCreator determineTaskCreator(TupleExpr expr,
 BindingSet bs)

Deprecated, for removal: This API element is subject to removal in a future version.

getNextBindJoinSize

protected int getNextBindJoinSize(int configuredBindJoinSize,
 int totalBindings)

Deprecated, for removal: This API element is subject to removal in a future version.

Return the size of the next bind join block.

Parameters:

configuredBindJoinSize - the configured bind join size

totalBindings - the current process bindings from the intermediate result set

Returns: