/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package org.apache.syncope.core.provisioning.java.job;

import org.apache.syncope.core.persistence.api.dao.JobStatusDAO;
import org.apache.syncope.core.persistence.api.entity.EntityFactory;
import org.apache.syncope.core.persistence.api.entity.JobStatus;
import org.apache.syncope.core.provisioning.api.event.JobStatusEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.event.EventListener;
import org.springframework.scheduling.annotation.Async;

public class JobStatusUpdater {

    protected static final Logger LOG = LoggerFactory.getLogger(JobStatusUpdater.class);

    protected final JobStatusDAO jobStatusDAO;

    protected final EntityFactory entityFactory;

    public JobStatusUpdater(final JobStatusDAO jobStatusDAO, final EntityFactory entityFactory) {
        this.jobStatusDAO = jobStatusDAO;
        this.entityFactory = entityFactory;
    }

    /**
     * It's important to note that responding to job status updates
     * must be done in async mode, and via a separate special thread executor
     * that attempts to synchronize job execution serially by only making one thread
     * active at a given time. Not doing so will force the event executor to launch
     * separate threads per each status update, which would result in multiple concurrent
     * INSERT operations on the database, and failing.
     *
     * @param event the event
     */
    @Async("jobStatusUpdaterThreadExecutor")
    @EventListener
    public void update(final JobStatusEvent event) {
        if (event.getJobStatus() == null) {
            LOG.debug("Deleting status for job '{}'", event.getJobRefDesc());
            jobStatusDAO.delete(event.getJobRefDesc());
        } else {
            LOG.debug("Updating job '{}' with status '{}'", event.getJobRefDesc(), event.getJobStatus());
            JobStatus jobStatus = entityFactory.newEntity(JobStatus.class);
            jobStatus.setKey(event.getJobRefDesc());
            jobStatus.setStatus(event.getJobStatus());
            jobStatusDAO.save(jobStatus);
        }
    }
}
