A future which forwards all its method calls to another future. Subclasses should override one or
 * more methods to modify the behavior of the backing future as desired per the <a href=
 * "http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
A future which forwards all its method calls to another future. Subclasses should override one or
 * more methods to modify the behavior of the backing future as desired per the <a href=
 * "http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. | ForwardingCheckedFuture.java