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package org.apache.solr.common.util;

/*
 * 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.
 */

import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;

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


public class ExecutorUtil {
  public static Logger log = LoggerFactory.getLogger(ExecutorUtil.class);
  
  public static void shutdownNowAndAwaitTermination(ExecutorService pool) {
    pool.shutdown(); // Disable new tasks from being submitted
    pool.shutdownNow(); // Cancel currently executing tasks
    boolean shutdown = false;
    while (!shutdown) {
      try {
        // Wait a while for existing tasks to terminate
        shutdown = pool.awaitTermination(5, TimeUnit.SECONDS);
      } catch (InterruptedException ie) {
        // Preserve interrupt status
        Thread.currentThread().interrupt();
      }
      if (!shutdown) {
        pool.shutdownNow(); // Cancel currently executing tasks
      }
    }
  }
  
  public static void shutdownAndAwaitTermination(ExecutorService pool) {
    pool.shutdown(); // Disable new tasks from being submitted
    boolean shutdown = false;
    while (!shutdown) {
      try {
        // Wait a while for existing tasks to terminate
        shutdown = pool.awaitTermination(30, TimeUnit.SECONDS);
      } catch (InterruptedException ie) {
        // Preserve interrupt status
        Thread.currentThread().interrupt();
      }
      if (!shutdown) {
        pool.shutdownNow(); // Cancel currently executing tasks
      }
    }
  }
}