001// Copyright 2011 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 015package org.apache.tapestry5.jpa; 016 017import java.util.List; 018 019import javax.persistence.EntityManager; 020import javax.persistence.EntityManagerFactory; 021import javax.persistence.spi.PersistenceUnitInfo; 022 023/** 024 * Responsible for creating an EntityManager as needed. 025 * 026 * @since 5.3 027 */ 028public interface EntityManagerSource 029{ 030 /** 031 * Creates an <code>EntityManager</code> for the given persistence unit name. 032 * 033 * @param persistenceUnitName the name of a persistence unit as defined in <code>persistence.xml<code> 034 * @return EntityManager for the given persistence unit name 035 */ 036 EntityManager create(String persistenceUnitName); 037 038 /** 039 * Gets the <code>EntityManagerFactory</code> for the given persistence unit name, creating it as necessary. 040 * 041 * @param persistenceUnitName the name of a persistence unit as defined in <code>persistence.xml<code> 042 * 043 * @return EntityManagerFactory for the given persistence unit name 044 */ 045 EntityManagerFactory getEntityManagerFactory(String persistenceUnitName); 046 047 /** 048 * Get the list of {@linkplain PersistenceUnitInfo} parsed from <code>persistence.xml<code>. 049 * 050 * @return list of PersistenceUnitInfos 051 */ 052 List<PersistenceUnitInfo> getPersistenceUnitInfos(); 053}