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1   /*
2    * Copyright 2013 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.util.concurrent;
17  
18  import java.util.Locale;
19  import java.util.concurrent.CancellationException;
20  import java.util.concurrent.ExecutionException;
21  import java.util.concurrent.TimeUnit;
22  import java.util.concurrent.TimeoutException;
23  
24  /**
25   * Abstract {@link Future} implementation which does not allow for cancellation.
26   *
27   * @param <V>
28   */
29  public abstract class AbstractFuture<V> implements Future<V> {
30  
31      @Override
32      public V get() throws InterruptedException, ExecutionException {
33          await();
34  
35          Throwable cause = cause();
36          if (cause == null) {
37              return getNow();
38          }
39          if (cause instanceof CancellationException) {
40              throw (CancellationException) cause;
41          }
42          throw new ExecutionException(cause);
43      }
44  
45      @Override
46      public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
47          if (await(timeout, unit)) {
48              Throwable cause = cause();
49              if (cause == null) {
50                  return getNow();
51              }
52              if (cause instanceof CancellationException) {
53                  throw (CancellationException) cause;
54              }
55              throw new ExecutionException(cause);
56          }
57          throw new TimeoutException("timeout after " + timeout + " " + unit.name().toLowerCase(Locale.ENGLISH));
58      }
59  }