Class Chain

src/Deferred.java:832–851

Callback used to chain a deferred with another one.

   * Callback used to chain a deferred with another one.
   */
  private static final class Chain<T> implements Callback<T, T> {
    private final Deferred<T> other;

    /**
     * Constructor.
     * @param other The other deferred to chain with.
     */
    public Chain(final Deferred<T> other) {
      this.other = other;
    }

    public T call(final T arg) {
      other.callback(arg);
      return arg;
    }

    public String toString() {
      return "chain with Deferred@" + other.hashCode();
    }
  };

  /**
   * Groups multiple {@code Deferred}s together in a single one.