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 */
018package org.apache.oozie.executor.jpa;
019
020import java.util.List;
021import javax.persistence.EntityManager;
022import javax.persistence.PersistenceException;
023import javax.persistence.Query;
024
025import org.apache.oozie.ErrorCode;
026import org.apache.oozie.client.rest.JsonBean;
027import org.apache.oozie.service.JPAService;
028import org.apache.oozie.service.Services;
029import org.apache.oozie.util.XLog;
030
031/**
032 * Base Class of Query Executor
033 */
034public abstract class QueryExecutor<T, E extends Enum<E>> {
035    private static XLog LOG;
036
037    protected QueryExecutor() {
038    }
039
040    public abstract int executeUpdate(E namedQuery, T jobBean) throws JPAExecutorException;
041
042    public void insert(JsonBean bean) throws JPAExecutorException {
043        if (bean != null) {
044            JPAService jpaService = Services.get().get(JPAService.class);
045            EntityManager em = jpaService.getEntityManager();
046            try {
047                em.getTransaction().begin();
048                em.persist(bean);
049                em.getTransaction().commit();
050            }
051            catch (PersistenceException e) {
052                throw new JPAExecutorException(ErrorCode.E0603, e);
053            }
054            finally {
055                if (em.getTransaction().isActive()) {
056                    LOG.warn("insert ended with an active transaction, rolling back");
057                    em.getTransaction().rollback();
058                }
059                if (em.isOpen()) {
060                    em.close();
061                }
062            }
063        }
064    }
065
066    public abstract T get(E namedQuery, Object... parameters) throws JPAExecutorException;
067
068    public abstract List<T> getList(E namedQuery, Object... parameters) throws JPAExecutorException;
069
070    public abstract Query getUpdateQuery(E namedQuery, T wfBean, EntityManager em) throws JPAExecutorException;
071
072    public abstract Query getSelectQuery(E namedQuery, EntityManager em, Object... parameters)
073            throws JPAExecutorException;
074
075    public abstract Object getSingleValue(E namedQuery, Object... parameters)
076            throws JPAExecutorException;
077
078}