class RpcClientHandler extends RpcHandler<RpcClientRequest, RpcClientResponse> {

  public Span handleSend(RpcClientRequest request) {
    if (request == null) throw new NullPointerException("request == null");
    return handleSend(request, tracer.nextSpan(sampler, request));
  }

    RpcClientHandler(RpcTracing rpcTracing);

}