Method reject

java/lib/src/main/java/io/github/ccxt/ws/Future.java:39–49

Reject the future with an error.

(Object error)

     * Reject the future with an error.
     */
    public void reject(Object error) {
        Exception exception;
        if (error instanceof Exception ex) {
            exception = ex;
        } else if (error == null) {
            exception = new RuntimeException("Future rejected with null");
        } else {
            exception = new RuntimeException("Future rejected: " + error);
        }
        this.completableFuture.completeExceptionally(exception);
    }

    /**
     * Get the underlying CompletableFuture for awaiting.