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.CoordinatorActionBean;
027import org.apache.oozie.ErrorCode;
028import org.apache.oozie.client.CoordinatorAction;
029import org.apache.oozie.util.ParamChecker;
030
031/**
032 * Load coordinator actions in READY state for a coordinator job.
033 */
034public 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.getMessage(), 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}