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SharedStorageConnector.java
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SharedStorageConnector.java
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package cz.cvut.kbss.ontodriver.jena.connector;
import cz.cvut.kbss.ontodriver.config.Configuration;
import cz.cvut.kbss.ontodriver.jena.exception.JenaDriverException;
import org.apache.jena.query.ReadWrite;
import org.apache.jena.rdf.model.*;
import org.apache.jena.system.Txn;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* Main storage connector using the {@link cz.cvut.kbss.ontodriver.jena.config.JenaOntoDriverProperties#READ_COMMITTED} connector strategy.
* <p>
* Adding statements to it actually adds them to the repository.
* <p>
* Note on transactions:
* <p>
* Starting a transaction on this connector also starts a write transaction on the underlying dataset. Commit then commits
* the transaction. Therefore, these transactions should be short. Reading can happen in parallel (as per Jena documentation).
*/
public class SharedStorageConnector extends AbstractStorageConnector {
SharedStorageConnector(Configuration configuration) {
super(configuration);
}
@Override
void initialize() {
this.storage = Storage.create(configuration);
}
@Override
public synchronized void begin() {
verifyOpen();
transaction.begin();
storage.getDataset().begin(ReadWrite.WRITE);
}
@Override
public synchronized void commit() throws JenaDriverException {
verifyOpen();
transaction.verifyActive();
transaction.commit();
storage.writeChanges();
storage.getDataset().commit();
transaction.afterCommit();
}
@Override
public void rollback() {
verifyOpen();
transaction.rollback();
storage.getDataset().abort();
transaction.afterRollback();
}
@Override
public Collection<Statement> find(Resource subject, Property property, RDFNode value) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(), () -> {
final StmtIterator it = storage.getDataset().getDefaultModel().listStatements(subject, property, value);
return it.toList();
});
}
@Override
public Collection<Statement> find(Resource subject, Property property, RDFNode value, String context) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(), () -> {
final StmtIterator it = storage.getDataset().getNamedModel(context)
.listStatements(subject, property, value);
return it.toList();
});
}
@Override
public boolean contains(Resource subject, Property property, RDFNode value) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(),
() -> storage.getDataset().getDefaultModel().contains(subject, property, value));
}
@Override
public boolean contains(Resource subject, Property property, RDFNode value, String context) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(),
() -> storage.getDataset().getNamedModel(context).contains(subject, property, value));
}
@Override
public List<String> getContexts() {
verifyOpen();
final Iterator<String> it = Txn.calculateRead(storage.getDataset(), () -> storage.getDataset().listNames());
final List<String> contexts = new ArrayList<>();
it.forEachRemaining(contexts::add);
return contexts;
}
@Override
public void add(List<Statement> statements) {
verifyOpen();
transaction.verifyActive();
storage.getDataset().getDefaultModel().add(statements);
}
@Override
public void add(List<Statement> statements, String context) {
verifyOpen();
transaction.verifyActive();
final Model targetGraph = storage.getDataset().getNamedModel(context);
targetGraph.add(statements);
}
@Override
public void remove(List<Statement> statements) {
verifyOpen();
transaction.verifyActive();
storage.getDataset().getDefaultModel().remove(statements);
}
@Override
public void remove(List<Statement> statements, String context) {
verifyOpen();
transaction.verifyActive();
final Model targetGraph = storage.getDataset().getNamedModel(context);
targetGraph.remove(statements);
}
@Override
public synchronized void close() {
storage.close();
super.close();
}
}