* least one {@code Throwable}) and calling the constructor via reflection. If the exception did
   * not already have a cause, one is set by calling {@link Throwable#initCause(Throwable)} on it.
   * If no such constructor exists, an {@code IllegalArgumentException} is thrown.
   *
   * @throws X if {@code get} throws any checked exception except for an {@code ExecutionException}

                    } catch (final InterruptedException e) {
                        final InterruptedIOException ie = new InterruptedIOException("Interrupted while acquiring credits");
                        ie.initCause(e);
                        throw ie;
                    }
                } else {
                    // not enough credits available or too big, split
                    if (log.isDebugEnabled()) {