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CPO is a persistence layer that allows you to persist POJOs. cpo-core is the persistence agnostic classes that are used for all persistence types.

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/*
 * Copyright (C) 2003-2012 David E. Berry
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * A copy of the GNU Lesser General Public License may also be found at
 * http://www.gnu.org/licenses/lgpl.txt
 */
package org.synchronoss.cpo;

/**
 * Created with IntelliJ IDEA.
 * User: dberry
 * Date: 9/10/13
 * Time: 12:51 PM
 * To change this template use File | Settings | File Templates.
 */
public abstract class AbstractDataSourceInfo implements DataSourceInfo {
  private T dataSource = null;
  private String dataSourceName = null;

  // Make sure DataSource creation is thread safe.
  private final Object LOCK = new Object();

  public AbstractDataSourceInfo(String dataSourceName) {
    this.dataSourceName=dataSourceName;
  }

  protected abstract T createDataSource() throws CpoException ;

  @Override
  public String getDataSourceName() {
    return dataSourceName;
  }

  @Override
  public T getDataSource() throws CpoException {
    if (dataSource == null) {
      synchronized (LOCK) {
        try {
          dataSource = createDataSource();
        } catch (Exception e) {
          throw new CpoException("Error instantiating DataSource", e);
        }
      }
    }

    return dataSource;
  }
}