code: public static <T> ListenableFuture<T> toSpringListenableFuture(com.google.common.util.concurrent.ListenableFuture<T> guavaListenableFuture) {
          return SpringFutureUtils.createListenableFuture(GuavaFutureUtils.createValueSourceFuture(guavaListenableFuture));
      }
docs: Converts Guava {@link com.google.common.util.concurrent.ListenableFuture} to Spring 4 {@link org.springframework.util.concurrent.ListenableFuture}