org.mycore.services.queuedjob.MCRStalledJobResetter Maven / Gradle / Ivy

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/*
 * This file is part of ***  M y C o R e  ***
 * See http://www.mycore.de/ for details.
 *
 * MyCoRe is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MyCoRe is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MyCoRe.  If not, see .
 */

package org.mycore.services.queuedjob;

import java.util.Date;
import java.util.HashMap;

import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.persistence.RollbackException;
import javax.persistence.TypedQuery;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.mycore.backend.jpa.MCREntityManagerProvider;
import org.mycore.common.config.MCRConfiguration2;

/**
 * Resets jobs that took to long to perform action.
 * Set property MCR.QueuedJob.TimeTillReset to alter grace period.
 * 
 * @author Ren\u00E9 Adler
 */
public class MCRStalledJobResetter implements Runnable {

    private static HashMap INSTANCES = new HashMap<>();

    private static Logger LOGGER = LogManager.getLogger(MCRStalledJobResetter.class);

    private int maxTimeDiff = MCRConfiguration2.getInt(MCRJobQueue.CONFIG_PREFIX + "TimeTillReset").orElse(10);

    private Class action = null;

    private MCRStalledJobResetter(Class action) {
        if (action != null) {
            this.action = action;
            maxTimeDiff = MCRConfiguration2
                .getInt(MCRJobQueue.CONFIG_PREFIX + action.getSimpleName() + ".TimeTillReset").orElse(maxTimeDiff);
        }
    }

    public static MCRStalledJobResetter getInstance(Class action) {
        String key = action != null && !MCRJobQueue.singleQueue ? action.getName() : "single";

        return INSTANCES.computeIfAbsent(key,
            k -> new MCRStalledJobResetter(MCRJobQueue.singleQueue ? null : action));
    }

    /**
     * Resets jobs to {@link MCRJobStatus#NEW} that where in status {@link MCRJobStatus#PROCESSING} for to long time.
     */
    public void run() {
        EntityManager em = MCREntityManagerProvider.getEntityManagerFactory().createEntityManager();
        EntityTransaction transaction = em.getTransaction();

        LOGGER.info("MCRJob is Checked for dead Entries");
        transaction.begin();

        StringBuilder sb = new StringBuilder("FROM MCRJob WHERE ");
        if (action != null) {
            sb.append("action='").append(action.getName()).append("' AND ");
        }
        sb.append(" status='" + MCRJobStatus.PROCESSING + "' ORDER BY id ASC");

        TypedQuery query = em.createQuery(sb.toString(), MCRJob.class);

        long current = new Date(System.currentTimeMillis()).getTime() / 60000;

        boolean reset = query
            .getResultList()
            .stream()
            .map(job -> {
                boolean ret = false;
                long start = job.getStart().getTime() / 60000;
                if (current - start >= maxTimeDiff) {
                    LOGGER.debug("->Resetting too long in queue");

                    job.setStatus(MCRJobStatus.NEW);
                    job.setStart(null);
                    ret = true;
                } else {
                    LOGGER.debug("->ok");
                }
                return ret;
            })
            .reduce(Boolean::logicalOr)
            .orElse(false);
        try {
            transaction.commit();
        } catch (RollbackException e) {
            e.printStackTrace();
            if (transaction != null) {
                transaction.rollback();
                reset = false;//No changes are applied, so no notification is needed as well
            }
        }
        //Only notify Listeners on Queue if really something is set back
        if (reset) {
            synchronized (MCRJobQueue.getInstance(action)) {
                MCRJobQueue.getInstance(action).notifyListener();
            }
        }
        em.close();
        LOGGER.info("MCRJob checking is done");
    }
}