Method flatMap

future-java/src/main/java/io/trane/future/Promise.java:489–500

(final Function<? super T, ? extends Future<R>> f)

  }

  @Override
  public final <R> Future<R> flatMap(final Function<? super T, ? extends Future<R>> f) {
    if (getInterruptHandler() != null)
      return continuation(new FlatMap<T, R>(f) {
        @Override
        protected final InterruptHandler getInterruptHandler() {
          return Promise.this;
        }
      });
    else
      return continuation(new FlatMap<T, R>(f));
  }

  private static class Transform<T, R> extends Continuation<T, R> {
    private final Transformer<? super T, ? extends R> t;