hadoop-tools/hadoop-resourceestimator/src/main/java/org/apache/hadoop/resourceestimator/service/ShutdownHook.java

/*
 *
 * 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.hadoop.resourceestimator.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Simple shutdown hook for {@link ResourceEstimatorServer}.
 */
public class ShutdownHook extends Thread {
  private static final Logger LOGGER =
      LoggerFactory.getLogger(ShutdownHook.class);
  private final ResourceEstimatorServer server;

  ShutdownHook(ResourceEstimatorServer server) {
    this.server = server;
  }

  public void run() {
    try {
      server.shutdown();
    } catch (Exception e) {
      LOGGER.error("HttpServer fails to shut down!");
    }
  }
}