public T getResult() {
        return result;
    }
Gets the value of the RPC result without blocking. Using {@link #get()} or
{@link #get(long, java.util.concurrent.TimeUnit)} is usually preferred because these methods
block until the result is available or an error occurs.

@return the value of the response
        or null if no result was returned or the RPC has not yet completed.
inlong-tubemq/tubemq-core/src/main/java/org/apache/inlong/tubemq/corerpc/client/CallFuture.java