Package org.aksw.jenax.dataaccess.sparql.common

Class WorkerThreadBase

java.lang.Object

org.aksw.jenax.dataaccess.sparql.common.WorkerThreadBase

Direct Known Subclasses:

RDFLinkWrapperWithWorkerThread, TransactionalWrapperWithWorkerThread

public class WorkerThreadBase
extends Object

Wraps an RDFLink such that all method calls originate from the same (worker) thread. Transactions in jena are per-thread rather than per-connection. This means, that if a main thread starts a write transaction on a connection and later a worker thread wants to perform a write on the same connection it results in a deadlock. This wrapper resolves the deadlock situation at the cost of processing any request from any thread made to the RDFLink sequentially in a single additional thread. Note that this class also wraps access to QueryExec, RowSet, etc such that it goes through the worker thread

Author:

raven

Field Summary

Fields

Modifier and Type	Field	Description
protected ExecutorService	es

Constructor Summary

Constructors

Constructor	Description
WorkerThreadBase()
WorkerThreadBase(ExecutorService es)

Method Summary

Modifier and Type	Method	Description
void	submit(Runnable runnable)
<T> T	submit(Callable<T> callable)
static <T> T	submit(ExecutorService executorService, Callable<T> callable)

Methods inherited from class java.lang.Object

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

Field Details

es

protected ExecutorService es

Constructor Details

WorkerThreadBase

public WorkerThreadBase()

WorkerThreadBase

public WorkerThreadBase(ExecutorService es)

Method Details

submit

public static <T> T submit(ExecutorService executorService,
 Callable<T> callable)

submit

public void submit(Runnable runnable)

submit

public <T> T submit(Callable<T> callable)