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.proxy;
  
  import alluxio.HealthCheckClient;
  import alluxio.RuntimeConstants;
  import alluxio.conf.Configuration;
  import alluxio.retry.ExponentialBackoffRetry;
  import alluxio.util.network.NetworkAddressUtils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Alluxio proxy monitor for inquiring the AlluxioProxy service availability.
   */
  public final class AlluxioProxyMonitor {
    private static final Logger LOG = LoggerFactory.getLogger(AlluxioProxyMonitor.class);
  
    /**
     * Starts the Alluxio proxy 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,
            AlluxioProxyMonitor.class.getCanonicalName());
        LOG.warn("ignoring arguments");
      }
  
      HealthCheckClient client = new ProxyHealthCheckClient(
          NetworkAddressUtils.getBindAddress(NetworkAddressUtils.ServiceType.PROXY_WEB,
              Configuration.global()),
          () -> new ExponentialBackoffRetry(50, 100, 2));
      if (!client.isServing()) {
        System.exit(1);
      }
      System.exit(0);
    }
  
    private AlluxioProxyMonitor() {} // prevent instantiation
  }
  