content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.job;
  
  import alluxio.HealthCheckClient;
  import alluxio.RuntimeConstants;
  import alluxio.conf.AlluxioConfiguration;
  import alluxio.conf.Configuration;
  import alluxio.master.AlluxioMasterMonitor;
  import alluxio.master.MasterHealthCheckClient;
  import alluxio.util.ConfigurationUtils;
  import alluxio.util.network.NetworkAddressUtils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Alluxio job_master monitor for inquiring AlluxioJobMaster service availability.
   */
  public final class AlluxioJobMasterMonitor {
    private static final Logger LOG = LoggerFactory.getLogger(AlluxioJobMasterMonitor.class);
  
    /**
     * Starts the Alluxio job_master monitor.
     *
     * @param args command line arguments, should be empty
     */
    public static void main(String[] args) {
      if (args.length != 0) {
        LOG.info("java -cp {} {}", RuntimeConstants.ALLUXIO_JAR,
            AlluxioJobMasterMonitor.class.getCanonicalName());
        LOG.warn("ignoring arguments");
      }
      AlluxioConfiguration conf = Configuration.global();
      HealthCheckClient client;
      // Only the primary master serves RPCs, so if we're configured for HA, fall back to simply
      // checking for the running process.
      if (ConfigurationUtils.isHaMode(conf)) {
        client = new MasterHealthCheckClient.Builder(conf)
            .withAlluxioMasterType(MasterHealthCheckClient.MasterType.JOB_MASTER)
            .build();
      } else {
        client = new JobMasterRpcHealthCheckClient(NetworkAddressUtils
            .getConnectAddress(NetworkAddressUtils.ServiceType.JOB_MASTER_RPC, conf),
            AlluxioMasterMonitor.TWO_MIN_EXP_BACKOFF, conf);
      }
  
      if (!client.isServing()) {
        System.exit(1);
      }
      System.exit(0);
    }
  
    private AlluxioJobMasterMonitor() {} // prevent instantiation
  }
  