Java tutorial
/* * Copyright 2001-2008 The Apache Software Foundation. * * 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 org.apache.juddi.config; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; import org.apache.commons.configuration.ConfigurationException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.util.Properties; public class PersistenceManager { private static Log log = LogFactory.getLog(PersistenceManager.class); public static final String PERSISTENCE_UNIT_NAME = "juddiDatabase"; private static EntityManagerFactory emf; public static EntityManager getEntityManager() { try { if (emf == null) AppConfig.getInstance(); } catch (ConfigurationException e) { log.error("Error initializing config in PersistenceManager", e); throw new ExceptionInInitializerError(e); } return emf.createEntityManager(); } public static void closeEntityManager() { if (emf.isOpen()) emf.close(); } protected static void initializeEntityManagerFactory(String persistenceUnitName) { try { if (emf == null) { Properties properties = new Properties(); properties.put("openjpa.ConnectionURL", System.getProperty("uddi.openjpa.ConnectionURL")); emf = Persistence.createEntityManagerFactory(persistenceUnitName, properties); } } catch (Throwable t) { log.error("entityManagerFactory creation failed", t); throw new ExceptionInInitializerError(t); } } }