org.apache.tapestry5.jpa.EntityManagerManager 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 java.util.Map;
/**
* Manages EntityManagers for the current thread.
* An EntityManager is created as needed and closed at the end of each request.
*
*
*
* The implementation of this service is per-thread.
*
* @since 5.3
*/
public interface EntityManagerManager
{
/**
* Gets the active EntityManager for this request, creating it as necessary.
*
* @param persistenceUnitName the name of a persistence unit as defined in {@code persistence.xml}
* @return EntityManager for the persistence unit,
*/
EntityManager getEntityManager(String persistenceUnitName);
/**
* Gets all active EntityManagers for this request, creating them as necessary.
*
* @return Map in which persistence unit names are associated with EntityManagers
*/
Map getEntityManagers();
}