org.apache.tapestry5.jpa.EntityManagerSource Maven / Gradle / Ivy
// 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.tapestry5.jpa;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceUnitInfo;
import java.util.List;
/**
* Responsible for creating an EntityManager as needed.
*
* @since 5.3
*/
public interface EntityManagerSource
{
/**
* Creates an EntityManager for the given persistence unit name.
*
* @param persistenceUnitName the name of a persistence unit as defined in {@code persistence.xml}
* @return EntityManager for the given persistence unit name
*/
EntityManager create(String persistenceUnitName);
/**
* Gets the EntityManagerFactory for the given persistence unit name, creating it as necessary.
*
* @param persistenceUnitName the name of a persistence unit as defined in {@code persistence.xml}
*
* @return EntityManagerFactory for the given persistence unit name
*/
EntityManagerFactory getEntityManagerFactory(String persistenceUnitName);
/**
* Get the list of {@linkplain PersistenceUnitInfo} parsed from {@code persistence.xml}.
*
* @return list of PersistenceUnitInfos
*/
List getPersistenceUnitInfos();
}