001    // Copyright 2007, 2008 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.tynamo.jpa;
016    
017    import javax.persistence.EntityManager;
018    import javax.persistence.EntityManagerFactory;
019    
020    /**
021     * Responsible for creating an EntityManager as needed. Internally, is responsible for
022     * PersistenceUnit {@link Configuration}, resulting in a {@link EntityManagerFactory}.
023     * <p/>
024     * The service's configuration is a {@linkplain org.apache.tapestry5.ioc.services.ChainBuilder chain
025     * of command} of configurator objects.
026     */
027    // @UsesOrderedConfiguration(org.apache.tapestry5.hibernate.HibernateConfigurer.class)
028    public interface JPAEntityManagerSource
029    {
030            /**
031             * Creates a new session using the {@link #getEntityManagerFactory() EntityManagerFactory}
032             * created at service startup.
033             */
034            EntityManager create();
035    
036            /**
037             * Returns the EntityManagerFactory from which JPA entity managers are created.
038             */
039            EntityManagerFactory getEntityManagerFactory();
040    }