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PoolingStorageConnector.java
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PoolingStorageConnector.java
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/**
* Copyright (C) 2019 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.sesame.connector;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
import org.eclipse.rdf4j.common.iteration.Iterations;
import org.eclipse.rdf4j.model.*;
import org.eclipse.rdf4j.query.TupleQueryResult;
import org.eclipse.rdf4j.repository.RepositoryConnection;
import org.eclipse.rdf4j.repository.RepositoryException;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
class PoolingStorageConnector extends AbstractConnector {
private static final ReentrantReadWriteLock LOCK = new ReentrantReadWriteLock();
private static final Lock READ = LOCK.readLock();
private static final Lock WRITE = LOCK.writeLock();
private final StorageConnector centralConnector;
private RepositoryConnection connection;
private LocalModel localModel;
PoolingStorageConnector(StorageConnector centralConnector) {
this.centralConnector = centralConnector;
this.open = true;
}
@Override
public TupleQueryResult executeSelectQuery(String query) throws SesameDriverException {
if (transaction.isActive()) {
return new ConnectionStatementExecutor(wrapConnection()).executeSelectQuery(query);
}
READ.lock();
try {
return centralConnector.executeSelectQuery(query);
} finally {
READ.unlock();
}
}
private RepositoryConnection wrapConnection() {
return new TransactionalRepositoryConnection(connection);
}
@Override
public boolean executeBooleanQuery(String query) throws SesameDriverException {
if (transaction.isActive()) {
return new ConnectionStatementExecutor(wrapConnection()).executeBooleanQuery(query);
}
READ.lock();
try {
return centralConnector.executeBooleanQuery(query);
} finally {
READ.unlock();
}
}
@Override
public void executeUpdate(String query) throws SesameDriverException {
WRITE.lock();
try {
centralConnector.executeUpdate(query);
} finally {
WRITE.unlock();
}
}
@Override
public List<Resource> getContexts() throws SesameDriverException {
READ.lock();
try {
return centralConnector.getContexts();
} finally {
READ.unlock();
}
}
@Override
public ValueFactory getValueFactory() {
// We don't need to lock the central connector, as getting the value
// factory does not require communication with the repository
return centralConnector.getValueFactory();
}
@Override
public void begin() throws SesameDriverException {
super.begin();
this.localModel = new LocalModel();
this.connection = centralConnector.acquireConnection();
}
@Override
public void commit() throws SesameDriverException {
transaction.commit();
WRITE.lock();
try {
centralConnector.begin();
centralConnector.removeStatements(localModel.getRemovedStatements());
centralConnector.addStatements(localModel.getAddedStatements());
centralConnector.commit();
transaction.afterCommit();
} catch (SesameDriverException e) {
transaction.rollback();
centralConnector.rollback();
transaction.afterRollback();
throw e;
} finally {
WRITE.unlock();
centralConnector.releaseConnection(connection);
this.localModel = null;
}
}
@Override
public void rollback() throws SesameDriverException {
transaction.rollback();
this.localModel = null;
centralConnector.releaseConnection(connection);
transaction.afterRollback();
}
@Override
public void close() throws OntoDriverException {
if (open && transaction.isActive()) {
this.localModel = null;
centralConnector.releaseConnection(connection);
}
super.close();
}
@Override
public void addStatements(Collection<Statement> statements) {
verifyTransactionActive();
assert statements != null;
localModel.addStatements(statements);
}
@Override
public void removeStatements(Collection<Statement> statements) {
verifyTransactionActive();
assert statements != null;
localModel.removeStatements(statements);
}
@Override
public Collection<Statement> findStatements(Resource subject, IRI property, Value value, boolean includeInferred)
throws SesameDriverException {
return findStatements(subject, property, value, includeInferred, null);
}
@Override
public Collection<Statement> findStatements(Resource subject, IRI property, Value value,
boolean includeInferred, IRI context) throws SesameDriverException {
verifyTransactionActive();
try {
final Collection<Statement> statements;
if (context != null) {
statements = Iterations
.asList(connection.getStatements(subject, property, value, includeInferred, context));
} else {
statements = Iterations.asList(connection.getStatements(subject, property, value, includeInferred));
}
localModel.enhanceStatements(statements, subject, property, value, context);
return statements;
} catch (RepositoryException e) {
rollback();
throw new SesameDriverException(e);
}
}
@Override
public boolean containsStatement(Resource subject, IRI property, Value value, boolean includeInferred)
throws SesameDriverException {
return containsStatement(subject, property, value, includeInferred, null);
}
@Override
public boolean containsStatement(Resource subject, IRI property, Value value, boolean includeInferred, IRI context)
throws SesameDriverException {
verifyTransactionActive();
try {
final LocalModel.Contains containsLocally = localModel.contains(subject, property, value, context);
switch (containsLocally) {
case TRUE:
return true;
case FALSE:
return false;
default:
if (context != null) {
return connection.hasStatement(subject, property, value, includeInferred, context);
} else {
return connection.hasStatement(subject, property, value, includeInferred);
}
}
} catch (RepositoryException e) {
rollback();
throw new SesameDriverException(e);
}
}
@Override
public <T> T unwrap(Class<T> cls) throws OntoDriverException {
if (cls.isAssignableFrom(this.getClass())) {
return cls.cast(this);
}
return centralConnector.unwrap(cls);
}
}