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ConnectorFactoryImpl.java
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ConnectorFactoryImpl.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 cz.cvut.kbss.ontodriver.OntologyStorageProperties;
import cz.cvut.kbss.ontodriver.config.Configuration;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
final class ConnectorFactoryImpl extends ConnectorFactory {
private boolean open;
private volatile Connector centralConnector;
ConnectorFactoryImpl() {
this.open = true;
}
public Connector createStorageConnector(OntologyStorageProperties storageProperties,
Configuration configuration) throws SesameDriverException {
if (!open) {
throw new IllegalStateException("The factory is closed!");
}
if (centralConnector == null) {
synchronized (this) {
if (centralConnector == null) {
initCentralConnector(storageProperties, configuration);
}
}
}
return new PoolingStorageConnector(centralConnector);
}
private void initCentralConnector(OntologyStorageProperties storageProperties,
Configuration configuration) throws SesameDriverException {
this.centralConnector = new StorageConnector(storageProperties, configuration);
}
public synchronized void close() throws OntoDriverException {
if (!open) {
return;
}
if (centralConnector != null) {
centralConnector.close();
this.centralConnector = null;
}
this.open = false;
}
public boolean isOpen() {
return open;
}
}