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   /*
    * Copyright 2013 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.util.concurrent;
  
  import java.util.concurrent.CancellationException;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  /**
   * Abstract {@link Future} implementation which does not allow for cancellation.
   *
   * @param <V>
   */
  public abstract class AbstractFuture<V> implements Future<V> {
  
      @Override
      public V get() throws InterruptedException, ExecutionException {
          await();
  
          Throwable cause = cause();
          if (cause == null) {
              return getNow();
          }
          if (cause instanceof CancellationException) {
              throw (CancellationException) cause;
          }
          throw new ExecutionException(cause);
      }
  
      @Override
      public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
          if (await(timeout, unit)) {
              Throwable cause = cause();
              if (cause == null) {
                  return getNow();
              }
              if (cause instanceof CancellationException) {
                  throw (CancellationException) cause;
              }
              throw new ExecutionException(cause);
          }
          throw new TimeoutException();
      }
  }