*
     * @param request the request to send
     * @throws IOException if an I/O error occurs
     */
    protected void doSend0(final Request request) throws IOException {
        try {
            doSend(request);
        } catch (final IOException ioe) {
            if (LogStream.level > 2) {
                ioe.printStackTrace(log);
            }
            try {

                }
                return true;
            }
        }
        return false;
    }

    protected void doSend0(final Request request) throws IOException {
        try {
            doSend(request);
        } catch (final IOException ioe) {
            log.warn("send failed", ioe);
            try {
                disconnect(true);

    /**
     * Sends a request to the remote endpoint.
     *
     * @param request the request to send
     * @throws IOException if an I/O error occurs
     */
    protected abstract void doSend(Request request) throws IOException;

    /**
     * Receives a response from the remote endpoint.
     *
     * @param response the response object to populate
     * @throws IOException if an I/O error occurs

     * @throws IOException if an I/O error occurs
     */
    protected <T extends Response> long doSend(final Request request, final T response, final Set<RequestParam> params, final long timeout)
            throws IOException {
        final long firstKey = prepareRequests(request, response, params, timeout);
        doSend(request);
        return firstKey;
    }

    /**
     * @param request
     * @param response

            if (recvException != null) {
                throw recvException;
            }
            return peekedKey;
        }

        @Override
        protected void doSend(Request request) throws IOException {
            if (sendException != null) {
                throw sendException;
            }
        }

        @Override

        maxReadWriteSize = Math.min(maxReadWriteSize, response.getMaxReadWriteSize());
        maxReceiveSize = Math.min(maxReceiveSize, response.getMaxReceiveSize());
    }
    
    @Override
    protected void doSend(ServerMessageBlock2 request) throws IOException {
        if (shouldUseRdmaReadWrite(request)) {
            sendWithRdmaReadWrite(request);
        } else {
            sendWithRdmaSendReceive(request);
        }