content: /*
   * 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.carbondata.processing.loading.sort.impl;
  
  import java.util.concurrent.ExecutorService;
  
  public class ThreadStatusObserver {
  
    /**
     * lock object
     */
    private Object lock = new Object();
  
    private ExecutorService executorService;
  
    private Throwable throwable;
  
    public ThreadStatusObserver(ExecutorService executorService) {
      this.executorService = executorService;
    }
  
    public void notifyFailed(Throwable throwable) {
      // Only the first failing thread should call for shutting down the executor service and
      // should assign the throwable object else the actual cause for failure can be overridden as
      // all the running threads will throw interrupted exception on calling shutdownNow and
      // will override the throwable object
      synchronized (lock) {
        if (null == this.throwable) {
          executorService.shutdownNow();
          this.throwable = throwable;
        }
      }
    }
  
    public Throwable getThrowable() {
  
      synchronized (lock) {
        return throwable;
      }
    }
  }
  