Basic example - get a user and look up items for him

BasicLF.java

ListenableFuture<User> user = getUser(args);

ListenableFuture<List<Item>> items = Futures.transform(user,
    new AsyncFunction<User, List<Item>>() {
        @Override
        public ListenableFuture<List<Item>> apply(User user) throws Exception {
          return getItemsForUser(user);
        }
      });