/**
 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License. See accompanying LICENSE file.
 */
package org.apache.oozie.command.coord;

import org.apache.oozie.CoordinatorJobBean;
import org.apache.oozie.client.CoordinatorJob;
import org.apache.oozie.command.CommandException;
import org.apache.oozie.store.CoordinatorStore;
import org.apache.oozie.store.StoreException;
import org.apache.oozie.util.XLog;

public class CoordRecoveryCommand extends CoordinatorCommand<Void> {
    private final XLog log = XLog.getLog(getClass());
    private String jobId;

    public CoordRecoveryCommand(String id) {
        super("coord_recovery", "coord_recovery", 1, XLog.STD);
        this.jobId = id;
    }

    @Override
    protected Void call(CoordinatorStore store) throws StoreException {
        //CoordinatorJobBean coordJob = store.getCoordinatorJob(jobId, true);
        CoordinatorJobBean coordJob = store.getEntityManager().find(CoordinatorJobBean.class, jobId);
        setLogInfo(coordJob);
        if (coordJob.getStatus() == CoordinatorJob.Status.PREMATER) {
            // update status of job from PREMATER to RUNNING in coordJob
            coordJob.setStatus(CoordinatorJob.Status.RUNNING);
            store.updateCoordinatorJob(coordJob);
            log.debug("[" + jobId + "]: Recover status from PREMATER to RUNNING");
        }
        else {
            log.debug("[" + jobId + "]: already in non-PREMATER status");
        }
        return null;
    }

    @Override
    protected Void execute(CoordinatorStore store) throws StoreException, CommandException {
        log.info("STARTED CoordRecoveryCommand for jobId=" + jobId);
        try {
            if (lock(jobId)) {
                call(store);
            }
            else {
                queueCallable(new CoordRecoveryCommand(jobId), LOCK_FAILURE_REQUEUE_INTERVAL);
                log.warn("CoordRecoveryCommand lock was not acquired - failed jobId=" + jobId
                        + ". Requeing the same.");
            }
        }
        catch (InterruptedException e) {
            queueCallable(new CoordRecoveryCommand(jobId), LOCK_FAILURE_REQUEUE_INTERVAL);
            log.warn("CoordRecoveryCommand lock acquiring failed with exception " + e.getMessage()
                    + " for jobId=" + jobId + " Requeing the same.");
        }
        finally {
            log.info("ENDED CoordRecoveryCommand for jobId=" + jobId);
        }
        return null;
    }

}