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.Query;
024
025import org.apache.oozie.client.rest.JsonBean;
026import org.apache.oozie.service.JPAService;
027import org.apache.oozie.service.Services;
028
029/**
030 * Base Class of Query Executor
031 */
032public abstract class QueryExecutor<T, E extends Enum<E>> {
033
034    protected QueryExecutor() {
035    }
036
037    public abstract int executeUpdate(E namedQuery, T jobBean) throws JPAExecutorException;
038
039    public void insert(final JsonBean bean) throws JPAExecutorException {
040        if (bean != null) {
041            JPAService jpaService = Services.get().get(JPAService.class);
042            jpaService.execute(new JsonBeanPersisterExecutor(bean));
043        }
044    }
045
046    public abstract T get(E namedQuery, Object... parameters) throws JPAExecutorException;
047
048    public abstract List<T> getList(E namedQuery, Object... parameters) throws JPAExecutorException;
049
050    public abstract Query getUpdateQuery(E namedQuery, T wfBean, EntityManager em) throws JPAExecutorException;
051
052    public abstract Query getSelectQuery(E namedQuery, EntityManager em, Object... parameters)
053            throws JPAExecutorException;
054
055    public abstract Object getSingleValue(E namedQuery, Object... parameters)
056            throws JPAExecutorException;
057
058}