How to wrap a Promise into Promise.retry about tascalate-concurrent HOT 5 CLOSED

protected Promise<T> retry(Callable<CompletionStage<T>> callable) throws Exception {
        
        int retries = 0;
        boolean isRetry = false;
        
        do {
            try {
                if (isRetry) {
                    logger.warn(String.format("Retrying previous request (%s).", retries));
                }
                
                return Promises.from(callable.call());
            } catch (final Exception e) {
                logger.error("An exception was thrown while processing request.", e);
    
                isRetry = true;
                if (retries >= maxRetries) {
                    throw e;
                }
            }
            
            //
            // Back off for two seconds to try and not saturate the server with retry attempts.
            //
            Thread.sleep(2000);
        } while (retries++ < maxRetries);
        
        throw new RuntimeException("The number of maximum retries has been exceeded for this request.");
    }