001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *      http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.oozie.executor.jpa;
020
021import java.util.List;
022
023import javax.persistence.EntityManager;
024import javax.persistence.PersistenceException;
025import javax.persistence.Query;
026
027import org.apache.oozie.ErrorCode;
028import org.apache.oozie.client.rest.JsonBean;
029import org.apache.oozie.service.JPAService;
030import org.apache.oozie.service.Services;
031import org.apache.oozie.util.XLog;
032
033/**
034 * Base Class of Query Executor
035 */
036public abstract class QueryExecutor<T, E extends Enum<E>> {
037    private static XLog LOG;
038
039    protected QueryExecutor() {
040    }
041
042    public abstract int executeUpdate(E namedQuery, T jobBean) throws JPAExecutorException;
043
044    public void insert(JsonBean bean) throws JPAExecutorException {
045        if (bean != null) {
046            JPAService jpaService = Services.get().get(JPAService.class);
047            EntityManager em = jpaService.getEntityManager();
048            try {
049                em.getTransaction().begin();
050                em.persist(bean);
051                em.getTransaction().commit();
052            }
053            catch (PersistenceException e) {
054                throw new JPAExecutorException(ErrorCode.E0603, e);
055            }
056            finally {
057                if (em.getTransaction().isActive()) {
058                    LOG.warn("insert ended with an active transaction, rolling back");
059                    em.getTransaction().rollback();
060                }
061                if (em.isOpen()) {
062                    em.close();
063                }
064            }
065        }
066    }
067
068    public abstract T get(E namedQuery, Object... parameters) throws JPAExecutorException;
069
070    public abstract List<T> getList(E namedQuery, Object... parameters) throws JPAExecutorException;
071
072    public abstract Query getUpdateQuery(E namedQuery, T wfBean, EntityManager em) throws JPAExecutorException;
073
074    public abstract Query getSelectQuery(E namedQuery, EntityManager em, Object... parameters)
075            throws JPAExecutorException;
076
077    public abstract Object getSingleValue(E namedQuery, Object... parameters)
078            throws JPAExecutorException;
079
080    public abstract T getIfExist(E namedQuery, Object... parameters) throws JPAExecutorException;
081
082}