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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.database.internal.core;
import java.sql.Connection;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Level;
import org.eclipse.osee.framework.core.exception.OseeCoreException;
import org.eclipse.osee.framework.core.exception.OseeDataStoreException;
import org.eclipse.osee.framework.core.exception.OseeExceptions;
import org.eclipse.osee.framework.database.core.IConnectionFactory;
import org.eclipse.osee.framework.database.core.OseeConnection;
import org.eclipse.osee.framework.database.internal.Activator;
import org.eclipse.osee.framework.logging.OseeLog;
public class OseeConnectionPoolImpl {
private static final int MAX_CONNECTIONS_PER_CLIENT = Math.max(8, 2 * Runtime.getRuntime().availableProcessors());
private final List<OseeConnectionImpl> connections = new CopyOnWriteArrayList<OseeConnectionImpl>();
private final String dbUrl;
private final Properties properties;
private final ConnectionFactoryProvider connectionFactory;
private final String driver;
public OseeConnectionPoolImpl(ConnectionFactoryProvider connectionFactory, String driver, String dbUrl, Properties properties) {
this.connectionFactory = connectionFactory;
this.driver = driver;
this.dbUrl = dbUrl;
this.properties = properties;
}
private IConnectionFactory createConnection(String driver) throws OseeCoreException {
return connectionFactory.get(driver);
}
public synchronized boolean hasOpenConnection() {
return connections.size() > 0;
}
/**
* at a minimum this should be called on jvm shutdown
*/
public synchronized void closeConnections() {
for (OseeConnection connection : connections) {
connection.close();
}
connections.clear();
}
synchronized void removeConnection(OseeConnection conn) {
connections.remove(conn);
}
public synchronized OseeConnectionImpl getConnection() throws OseeCoreException {
for (OseeConnectionImpl connection : connections) {
if (connection.lease()) {
return connection;
}
}
if (connections.size() >= MAX_CONNECTIONS_PER_CLIENT) {
throw new OseeDataStoreException(
"This client has reached the maximum number of allowed simultaneous database connections of : " + MAX_CONNECTIONS_PER_CLIENT);
}
OseeConnectionImpl connection = getOseeConnection();
connections.add(connection);
OseeLog.log(Activator.class, Level.INFO, String.format("DbConnection: [%s] - [%d]", dbUrl, connections.size()));
return connection;
}
private OseeConnectionImpl getOseeConnection() throws OseeCoreException {
try {
IConnectionFactory connectionDriver = createConnection(driver);
Connection connection = connectionDriver.getConnection(properties, dbUrl);
connection.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
return new OseeConnectionImpl(connection, this);
} catch (Exception ex) {
OseeExceptions.wrapAndThrow(ex);
return null; // unreachable since wrapAndThrow() always throws an exception
}
}
synchronized void returnConnection(OseeConnectionImpl connection) {
try {
if (connection.isClosed()) {
removeConnection(connection);
} else {
connection.expireLease();
}
} catch (OseeCoreException ex) {
OseeLog.log(Activator.class, Level.SEVERE, ex);
removeConnection(connection);
}
}
synchronized void releaseUneededConnections() throws OseeCoreException {
for (OseeConnectionImpl connection : connections) {
if (connection.isStale()) {
connection.destroy();
}
}
}
}
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