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    package org.apache.oozie.executor.jpa;
019    
020    import java.util.ArrayList;
021    import java.util.List;
022    
023    import javax.persistence.EntityManager;
024    import javax.persistence.Query;
025    
026    import org.apache.oozie.CoordinatorJobBean;
027    import org.apache.oozie.ErrorCode;
028    
029    /**
030     * Get a list of Coordinator Jobs that are in pending. The result is ordered by lastModifiedTimestamp.
031     */
032    public 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);
067            }
068            return jobList;
069        }
070    }