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.ArrayList;
021import java.util.List;
022
023import javax.persistence.EntityManager;
024import javax.persistence.Query;
025
026import org.apache.oozie.CoordinatorJobBean;
027import org.apache.oozie.ErrorCode;
028
029/**
030 * Get a list of Coordinator Jobs that are in pending. The result is ordered by lastModifiedTimestamp.
031 */
032public class CoordJobsGetPendingJPAExecutor implements JPAExecutor<List<CoordinatorJobBean>> {
033    private int limit;
034
035    public CoordJobsGetPendingJPAExecutor(int limit) {
036        this.limit = limit;
037    }
038
039    /* (non-Javadoc)
040     * @see org.apache.oozie.executor.jpa.JPAExecutor#getName()
041     */
042    @Override
043    public String getName() {
044        return "CoordJobsGetPendingJPAExecutor";
045    }
046
047    /* (non-Javadoc)
048     * @see org.apache.oozie.executor.jpa.JPAExecutor#execute(javax.persistence.EntityManager)
049     */
050    @Override
051    @SuppressWarnings("unchecked")
052    public List<CoordinatorJobBean> execute(EntityManager em) throws JPAExecutorException {
053        List<CoordinatorJobBean> coordBeans;
054        List<CoordinatorJobBean> jobList = new ArrayList<CoordinatorJobBean>();
055        try {
056            Query q = em.createNamedQuery("GET_COORD_JOBS_PENDING");
057            if (limit > 0) {
058                q.setMaxResults(limit);
059            }
060            coordBeans = q.getResultList();
061            for (CoordinatorJobBean j : coordBeans) {
062                jobList.add(j);
063            }
064        }
065        catch (Exception e) {
066            throw new JPAExecutorException(ErrorCode.E0603, e.getMessage(), e);
067        }
068        return jobList;
069    }
070}