2 * Copyright (c) 2018. Developed by Hedgecode.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package org.hedgecode.chess.service.jpa;
19 import javax.persistence.EntityManager;
20 import javax.persistence.Persistence;
22 import org.hedgecode.chess.domain.DomainObject;
23 import org.hedgecode.chess.service.DomainService;
28 * @author Dmitry Samoshin aka gotty
30 public abstract class JpaDomainService<DomainType extends DomainObject> implements DomainService<DomainType> {
32 // todo: maybe single entityManager
33 private DomainManager domainManager;
36 domainManager = new DomainManager();
39 EntityManager getEntityManager() {
40 return domainManager.getEntityManager();
44 public DomainType create(DomainType domainObject) {
45 getEntityManager().persist(
52 public DomainType update(DomainType domainObject) {
53 getEntityManager().persist(
60 public void remove(DomainType domainObject) {
61 getEntityManager().remove(
66 private class DomainManager {
68 private static final String PERSISTENCE_UNIT_NAME = "db-etude-persistence-unit";
70 private EntityManager entityManager;
72 EntityManager getEntityManager() {
73 if (entityManager == null)
74 createEntityManager();
78 void createEntityManager() {
79 entityManager = Persistence.createEntityManagerFactory(
81 ).createEntityManager();