Bug 208512 Classes in package org.eclipse.birt.data.engine.odaconsumer have multithreads issues
Classes in package org.eclipse.birt.data.engine.odaconsumer are not thread-safe.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/odaconsumer/DriverManager.java
/*
 *****************************************************************************
 * Copyright (c) 2004, 2007 Actuate Corporation.
 * 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:
 *  Actuate Corporation - initial API and implementation
 *
 ******************************************************************************
 */  
package org.eclipse.birt.data.engine.odaconsumer;
import java.util.Hashtable;
import org.eclipse.birt.data.engine.core.DataException;
import org.eclipse.datatools.connectivity.oda.IDriver;
import org.eclipse.datatools.connectivity.oda.util.manifest.ExtensionManifest;
/**
 * Package internal class.
 * <code>DriverManager</code> manages a set of data source drivers.  Calling 
 * <code>getInstance</code> will return the singleton instance of <code>DriverManager</code>.
 * 
 * When the method <code>getDriverHelper</code> is initiated by the 
 * <code>ConnectionManager</code>, the <code>DriverManager</code> will 
 * attempt to load the specified driver and return a <code>IDriver</code> 
 * instance of that driver.
 */
public class DriverManager