--- /dev/null
+/*
+ * Copyright 2005-2010 the original author or authors.
+ *
+ * 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.wamblee.test.persistence;
+
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+import javax.persistence.PersistenceException;
+
+import org.wamblee.test.jndi.StubInitialContextFactory;
+
+/**
+ * Utility for building an appropriately configured EntityManagerFactory. The
+ * idea is that a persistence.xml is used unchanged from the production version.
+ * This utility will then add the additional properties required for execution
+ * in a standalone environment.
+ *
+ * The other purpose is to to shield dependencies of the test code on a
+ * particular JPA provider.
+ */
+public class JpaBuilder {
+
+ private static final Logger LOGGER = Logger.getLogger(JpaBuilder.class
+ .getName());
+
+ /**
+ * Callback interface to execute some JPA code within a transaction with the
+ * entitymanager to use provided as input.
+ */
+ public static interface JpaUnitOfWork<T> {
+ /**
+ * Executes the unit of work. A transaction has been started.
+ *
+ * @param aEm
+ * Entity manager.
+ * @return Result of the execute method. If you don't want to return
+ * anything use <code>Void</code> for the return type and return
+ * null from the implementation.
+ */
+ T execute(EntityManager aEm) throws Exception;
+ }
+
+ private PersistenceUnitDescription persistenceUnit;
+ private String url;
+ private String user;
+ private String password;
+ private EntityManagerFactory factory;
+
+ /**
+ * Constructs the builder.
+ *
+ * @param aUrl JDBC URL
+ * @param aUser User name
+ * @param aPassword Password.
+ * @param aPersistenceUnit
+ * Persistence unit.
+ */
+ public JpaBuilder(String aUrl, String aUser, String aPassword,
+ PersistenceUnitDescription aPersistenceUnit) {
+ persistenceUnit = aPersistenceUnit;
+ url = aUrl;
+ user = aUser;
+ password = aPassword;
+ }
+
+ /**
+ * Starts the builder, which in particular, mocks JNDI, binds the datasource
+ * the JNDI where the persistence unit expects it, creates the entity
+ * manager factory, and forces creation of the database schema.
+ */
+ public void start() throws Exception {
+ factory = createFactory();
+ try {
+ execute(new JpaUnitOfWork<Void>() {
+ public Void execute(EntityManager aEm) {
+ // Empty, just to trigger database schema creation.
+ return null;
+ }
+ });
+ } catch (PersistenceException e) {
+ factory.close();
+ throw e;
+ }
+ }
+
+ /**
+ * Stops the entity manager factory and disables JNDI mocking.
+ */
+ public void stop() {
+ StubInitialContextFactory.unregister();
+ factory.close();
+ }
+
+ /**
+ * Creates a new entity manager factory. Typically not used by test code.
+ *
+ * @return Entity manager factory.
+ */
+ public EntityManagerFactory createFactory() {
+ Map<String, String> jpaProps = new TreeMap<String, String>();
+
+ jpaProps.put("javax.persistence.jtaDataSource", null);
+ jpaProps.put("javax.persistence.transactionType", "RESOURCE_LOCAL");
+ jpaProps.put("javax.persistence.jdbc.url", url);
+ jpaProps.put("javax.persistence.jdbc.user", user);
+ jpaProps.put("javax.persistence.jdbc.password", password);
+
+ JpaCustomizerBuilder.getCustomizer().customize(persistenceUnit,
+ jpaProps);
+
+ // jpaProps.put("javax.persistence.provider",
+ // HibernatePersistence.class.getName());
+ EntityManagerFactory emf = Persistence.createEntityManagerFactory(
+ persistenceUnit.getUnitName(), jpaProps);
+
+ LOGGER.info("Using " + emf.getClass());
+ return emf;
+ }
+
+ /**
+ * Executes a unit of work. This creates an entitymanager and runs the
+ * {@link JpaUnitOfWork#execute(EntityManager)} within a transaction,
+ * passing it the entity manager. Use of this method saves a lot of typing
+ * for applications.
+ *
+ * @param aWork
+ * Work to execute.
+ * @return The return value of the execute method of the unit of work.
+ */
+ public <T> T execute(JpaUnitOfWork<T> aWork) throws Exception {
+ EntityManager em = factory.createEntityManager();
+ EntityTransaction transaction = em.getTransaction();
+ transaction.begin();
+ try {
+ T value = aWork.execute(em);
+ transaction.commit();
+ return value;
+ } catch (Exception e) {
+ LOGGER.log(Level.WARNING, "Exception occured", e);
+ transaction.rollback();
+ throw e;
+ } finally {
+ em.close();
+ }
+ }
+}
git://wamblee.org / utils / blobdiff