/**
     * Consume a send credit
     */
    public void consumeSendCredit() {
        sendCredits.decrementAndGet();
    }

    /**
     * Grant a send credit
     */
    public void grantSendCredit() {
        sendCredits.incrementAndGet();
    }

    /**
     * Grant a receive credit
     */
    public void grantReceiveCredit() {
        receiveCredits.incrementAndGet();
    }