/*
 * 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.ambari.view.hive2.actor;

import akka.actor.ActorRef;
import org.apache.ambari.view.hive2.actor.message.HiveMessage;
import org.apache.ambari.view.hive2.actor.message.job.SaveGuidToDB;
import org.apache.ambari.view.hive2.actor.message.job.UpdateYarnAtsGuid;
import org.apache.hive.jdbc.HiveStatement;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import scala.concurrent.duration.Duration;

import java.util.concurrent.TimeUnit;


/**
 * Queries YARN/ATS time to time to fetch the status of the ExecuteJob and updates database
 */
public class YarnAtsGUIDFetcher extends HiveActor {

  private final Logger LOG = LoggerFactory.getLogger(getClass());

  private final ActorRef jdbcConnectorActor;

  public YarnAtsGUIDFetcher(ActorRef jdbcConnectorActor) {
    this.jdbcConnectorActor = jdbcConnectorActor;
  }

  @Override
  public void handleMessage(HiveMessage hiveMessage) {
    Object message = hiveMessage.getMessage();
    if(message instanceof UpdateYarnAtsGuid) {
      updateGuid((UpdateYarnAtsGuid) message);
    }
  }

  private void updateGuid(UpdateYarnAtsGuid message) {
    HiveStatement statement = message.getStatement();
    String jobId = message.getJobId();
    String yarnAtsGuid = statement.getYarnATSGuid();

    LOG.info("Fetched guid: {}, for job id: {}", yarnAtsGuid, jobId);

    // If ATS GUID is not yet generated, we will retry after 1 second
    if(yarnAtsGuid == null) {
      LOG.info("Retrying to fetch guid");
      getContext().system().scheduler()
        .scheduleOnce(Duration.create(1, TimeUnit.SECONDS), getSelf(), message, getContext().dispatcher(), null);
    } else {
      jdbcConnectorActor.tell(new SaveGuidToDB(message.getStatementId(), yarnAtsGuid, jobId), self());
      LOG.info("Message send to save GUID for Statement Id: {}, Job id: {}, Guid: {}", message.getStatementId(), message.getJobId(), yarnAtsGuid);
    }
  }
}