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;
022import javax.persistence.EntityManager;
023import javax.persistence.PersistenceException;
024import javax.persistence.Query;
025
026import org.apache.oozie.ErrorCode;
027import org.apache.oozie.client.rest.JsonBean;
028import org.apache.oozie.service.JPAService;
029import org.apache.oozie.service.Services;
030import org.apache.oozie.util.XLog;
031
032/**
033 * Base Class of Query Executor
034 */
035public abstract class QueryExecutor<T, E extends Enum<E>> {
036    private static XLog LOG;
037
038    protected QueryExecutor() {
039    }
040
041    public abstract int executeUpdate(E namedQuery, T jobBean) throws JPAExecutorException;
042
043    public void insert(JsonBean bean) throws JPAExecutorException {
044        if (bean != null) {
045            JPAService jpaService = Services.get().get(JPAService.class);
046            EntityManager em = jpaService.getEntityManager();
047            try {
048                em.getTransaction().begin();
049                em.persist(bean);
050                em.getTransaction().commit();
051            }
052            catch (PersistenceException e) {
053                throw new JPAExecutorException(ErrorCode.E0603, e);
054            }
055            finally {
056                if (em.getTransaction().isActive()) {
057                    LOG.warn("insert ended with an active transaction, rolling back");
058                    em.getTransaction().rollback();
059                }
060                if (em.isOpen()) {
061                    em.close();
062                }
063            }
064        }
065    }
066
067    public abstract T get(E namedQuery, Object... parameters) throws JPAExecutorException;
068
069    public abstract List<T> getList(E namedQuery, Object... parameters) throws JPAExecutorException;
070
071    public abstract Query getUpdateQuery(E namedQuery, T wfBean, EntityManager em) throws JPAExecutorException;
072
073    public abstract Query getSelectQuery(E namedQuery, EntityManager em, Object... parameters)
074            throws JPAExecutorException;
075
076    public abstract Object getSingleValue(E namedQuery, Object... parameters)
077            throws JPAExecutorException;
078
079}