PMF.java

/*
 *  Copyright 2012 Axel Winkler, Daniel Dunér
 * 
 *  This file is part of Daxplore Presenter.
 *
 *  Daxplore Presenter 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.
 *
 *  Daxplore Presenter 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 Daxplore Presenter.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.daxplore.presenter.server.storage;

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;

/**
 * Gives access to a {@link PersistenceManagerFactory} instance.
 * 
 * <p>The instance is kept unique for each server instance.</p>
 */
public final class PMF {
	private static final PersistenceManagerFactory pmfInstance = JDOHelper.getPersistenceManagerFactory("transactions-optional");

	private PMF() {
	}

	/**
	 * Gets the server-instance's {@link PersistenceManagerFactory}.
	 * 
	 * @return the persistence manager factory
	 */
	public static PersistenceManagerFactory get() {
		return pmfInstance;
	}
}