/*
    * 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);
          }
      }
  }