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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    *   http://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.concurrent.ExecutionException;
19  import java.util.concurrent.TimeUnit;
20  import java.util.concurrent.TimeoutException;
21  
22  /**
23   * Abstract {@link Future} implementation which does not allow for cancellation.
24   *
25   * @param <V>
26   */
27  public abstract class AbstractFuture<V> implements Future<V> {
28  
29      @Override
30      public V get() throws InterruptedException, ExecutionException {
31          await();
32  
33          Throwable cause = cause();
34          if (cause == null) {
35              return getNow();
36          }
37          throw new ExecutionException(cause);
38      }
39  
40      @Override
41      public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
42          if (await(timeout, unit)) {
43              Throwable cause = cause();
44              if (cause == null) {
45                  return getNow();
46              }
47              throw new ExecutionException(cause);
48          }
49          throw new TimeoutException();
50      }
51  }