Implicit parameters

RpcContext.getContext().setAttachment("index", "1"); // implicitly pass parameters,behind the remote call will implicitly send these parameters to the server side, similar to the cookie, for the framework of integration, not recommended for regular business use
xxxService.xxx(); // remote call
// ...

public class XxxServiceImpl implements XxxService {

    public void xxx() {
        // get parameters which passed by the consumer side,for the framework of integration, not recommended for regular business use
        String index = RpcContext.getContext().getAttachment("index");
    }
}