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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;
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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  }