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PoolingStorageConnector.java
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PoolingStorageConnector.java
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/**
* Copyright (C) 2016 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 java.util.Collection;
import java.util.List;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import org.openrdf.model.Resource;
import org.openrdf.model.Statement;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.model.ValueFactory;
import org.openrdf.query.TupleQueryResult;
import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
class PoolingStorageConnector extends AbstractConnector {
private static final ReentrantReadWriteLock LOCK = new ReentrantReadWriteLock();
private static Lock READ = LOCK.readLock();
private static Lock WRITE = LOCK.writeLock();
private final Connector centralConnector;
private LocalModel localModel;
public PoolingStorageConnector(Connector centralConnector) {
this.centralConnector = centralConnector;
this.open = true;
}
@Override
public TupleQueryResult executeSelectQuery(String query) throws SesameDriverException {
READ.lock();
try {
return centralConnector.executeSelectQuery(query);
} finally {
READ.unlock();
}
}
@Override
public boolean executeBooleanQuery(String query) throws SesameDriverException {
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();
}
@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();
this.localModel = null;
}
}
@Override
public void rollback() {
transaction.rollback();
this.localModel = null;
transaction.afterRollback();
}
@Override
public void addStatements(Collection<Statement> statements) {
verifyTransactionActive();
assert statements != null;
localModel.addStatements(statements);
}
@Override
public void removeStatements(Collection<Statement> statements) throws SesameDriverException {
verifyTransactionActive();
assert statements != null;
localModel.removeStatements(statements);
}
@Override
public Collection<Statement> findStatements(Resource subject, URI property, Value value,
boolean includeInferred, URI... contexts) throws SesameDriverException {
verifyTransactionActive();
READ.lock();
try {
final Collection<Statement> statements = centralConnector.findStatements(subject,
property, value, includeInferred, contexts);
localModel.enhanceStatements(statements, subject, property, value, contexts);
return statements;
} catch (SesameDriverException e) {
centralConnector.rollback();
throw e;
} finally {
READ.unlock();
}
}
@Override
public <T> T unwrap(Class<T> cls) throws OntoDriverException {
if (cls.isAssignableFrom(this.getClass())) {
return cls.cast(this);
}
return centralConnector.unwrap(cls);
}
}