org.eclipse.rdf4j.federated.evaluation.union

Class SynchronousWorkerUnion<T>

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>

org.eclipse.rdf4j.common.iteration.LookAheadIteration<T,QueryEvaluationException>

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

org.eclipse.rdf4j.federated.evaluation.union.UnionExecutorBase<T>

org.eclipse.rdf4j.federated.evaluation.union.WorkerUnionBase<T>

org.eclipse.rdf4j.federated.evaluation.union.SynchronousWorkerUnion<T>

All Implemented Interfaces:

AutoCloseable, Runnable, CloseableIteration<T,QueryEvaluationException>, Iteration<T,QueryEvaluationException>, ParallelExecutor<T>

public class SynchronousWorkerUnion<T>
extends WorkerUnionBase<T>

Synchronous execution of union tasks, i.e. one after the other. The union result is contained in this iteration. Note that the union operation is to be executed with the ParallelExecutorBase.run() method

Author:

Andreas Schwarte

Field Summary

Fields inherited from class org.eclipse.rdf4j.federated.evaluation.union.WorkerUnionBase

tasks

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

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

Constructor Summary

Constructors

Constructor and Description
SynchronousWorkerUnion(FederationEvalStrategy strategy, QueryInfo queryInfo)

Method Summary

Modifier and Type	Method and Description
protected void	union() Note: this method must block until the union is executed completely.

Methods inherited from class org.eclipse.rdf4j.federated.evaluation.union.WorkerUnionBase

addTask

Methods inherited from class org.eclipse.rdf4j.federated.evaluation.union.UnionExecutorBase

getExecutorType, performExecution

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

addResult, checkTimeout, done, getDisplayId, getId, getNextElement, getQueryInfo, handleClose, 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.Iteration

stream

Constructor Detail

SynchronousWorkerUnion

public SynchronousWorkerUnion(FederationEvalStrategy strategy,
                              QueryInfo queryInfo)

Method Detail

union

protected void union()
              throws Exception

Description copied from class: UnionExecutorBase

Note: this method must block until the union is executed completely. Otherwise the result queue is marked as committed while this isn't the case. The blocking behavior in general is no problem: If you need concurrent access to the result (i.e. pipelining) just run the union in a separate thread. Access to the result iteration is synchronized.

Specified by:

union in class UnionExecutorBase<T>

Throws:

Exception