scriptella.driver.hsqldb.Driver Maven / Gradle / Ivy
/*
* Copyright 2006-2012 The Scriptella Project Team.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package scriptella.driver.hsqldb;
import scriptella.jdbc.GenericDriver;
import scriptella.jdbc.JdbcConnection;
import scriptella.spi.ConnectionParameters;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Scriptella Adapter for HSLQDB database.
* The primary feature of this driver is {@link HsqlConnection#SHUTDOWN_ON_EXIT}.
*
For configuration details and examples see overview page.
*
* @author Fyodor Kupolov
* @version 1.0
*/
public class Driver extends GenericDriver {
private static final Logger LOG = Logger.getLogger(Driver.class.getName());
public static final String HSQLDB_DRIVER_NAME = "org.hsqldb.jdbcDriver";
private static Map lastConnections = null; //Send SHUTDOWN on JVM exit to fix
private static boolean hookAdded = false;
/**
* Shutdown hook closing all the databases being used.
*/
static final Thread HOOK = new Thread("Scriptella HSLQDB Shutdown Fix") {
public void run() {
if (lastConnections != null) {
for (Map.Entry entry : lastConnections.entrySet()) {
try {
entry.getValue().shutdown();
} catch (Exception e) {
LOG.log(Level.WARNING, "Problem occured while trying to shutdown an in-process HSQLDB database " + entry.getKey(), e);
}
}
lastConnections = null;
}
}
};
public Driver() {
loadDrivers(HSQLDB_DRIVER_NAME);
}
@Override
protected JdbcConnection connect(ConnectionParameters parameters, Properties props) throws SQLException {
return new HsqlConnection(getConnection(parameters.getUrl(), props), parameters);
}
/**
* Sets last connection and returns previous value of lastConnection for connection url.
* Driver stores map of connections using URLs as keys.
*
* @param connection last connection
* @return previous value of lastConnection field.Null if no connections have been registered.
* @see #HOOK
*/
static synchronized HsqlConnection setLastConnection(HsqlConnection connection) {
if (lastConnections == null) {
lastConnections = new HashMap();
}
final HsqlConnection old = lastConnections.put(getConnectionURL(connection), connection);
if (!hookAdded) {
Runtime.getRuntime().addShutdownHook(HOOK);
hookAdded = true;
}
return old;
}
private static String getConnectionURL(HsqlConnection connection) {
try {
return connection.getNativeConnection().getMetaData().getURL();
} catch (Exception e) {
LOG.log(Level.WARNING, "Unable to read connection meta data", e);
return "";
}
}
}