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.CoordinatorActionBean;
027 import org.apache.oozie.ErrorCode;
028 import org.apache.oozie.client.CoordinatorAction;
029 import org.apache.oozie.util.ParamChecker;
030
031 /**
032 * Load coordinator actions in READY state for a coordinator job.
033 */
034 public class CoordJobGetReadyActionsJPAExecutor implements JPAExecutor<List<CoordinatorActionBean>> {
035
036 private String coordJobId = null;
037 private int numResults;
038 private String executionOrder = null;
039
040 public CoordJobGetReadyActionsJPAExecutor(String coordJobId, int numResults, String executionOrder) {
041 ParamChecker.notNull(coordJobId, "coordJobId");
042 this.coordJobId = coordJobId;
043 this.numResults = numResults;
044 this.executionOrder = executionOrder;
045 }
046
047 @Override
048 public String getName() {
049 return "CoordJobGetReadyActionsJPAExecutor";
050 }
051
052 @Override
053 @SuppressWarnings("unchecked")
054 public List<CoordinatorActionBean> execute(EntityManager em) throws JPAExecutorException {
055 List<CoordinatorActionBean> actionBeans = null;
056 try {
057 Query q;
058 // check if executionOrder is FIFO, LIFO, or LAST_ONLY
059 if (executionOrder.equalsIgnoreCase("FIFO")) {
060 q = em.createNamedQuery("GET_COORD_ACTIONS_FOR_JOB_FIFO");
061 }
062 else {
063 q = em.createNamedQuery("GET_COORD_ACTIONS_FOR_JOB_LIFO");
064 }
065 q.setParameter("jobId", coordJobId);
066
067 // if executionOrder is LAST_ONLY, only retrieve first record in LIFO,
068 // otherwise, use numResults if it is positive.
069 if (executionOrder.equalsIgnoreCase("LAST_ONLY")) {
070 q.setMaxResults(1);
071 }
072 else {
073 if (numResults > 0) {
074 q.setMaxResults(numResults);
075 }
076 }
077 List<Object[]> objectArrList = q.getResultList();
078 actionBeans = new ArrayList<CoordinatorActionBean>();
079 for (Object[] arr : objectArrList) {
080 CoordinatorActionBean caa = getBeanForCoordinatorActionFromArray(arr);
081 actionBeans.add(caa);
082 }
083 return actionBeans;
084 }
085 catch (Exception e) {
086 throw new JPAExecutorException(ErrorCode.E0603, e);
087 }
088 }
089
090 private CoordinatorActionBean getBeanForCoordinatorActionFromArray(Object arr[]) {
091 CoordinatorActionBean bean = new CoordinatorActionBean();
092 if (arr[0] != null) {
093 bean.setId((String) arr[0]);
094 }
095 if (arr[1] != null) {
096 bean.setJobId((String) arr[1]);
097 }
098 if (arr[2] != null) {
099 bean.setStatus(CoordinatorAction.Status.valueOf((String) arr[2]));
100 }
101 if (arr[3] != null) {
102 bean.setPending((Integer) arr[3]);
103 }
104 return bean;
105 }
106
107 }