Q: How the server start requests to the client?

[林晓锋]

Hi, @all:

    It is mentioned that "Requests and responses can go in any direction." at FAQ (https://capnproto.org/faq.html) , I would like to know is there any example of the server start requests to the client?

[Kenton Varda]

Yes, the "calculator" sample program does this, where the client can send the server a `Function` implementation, and the server calls back to it.

https://github.com/capnproto/capnproto/tree/master/c++/samples

The trick here is that any message (including parameters or results of an RPC call) can contain references to new objects (`interface` types). If the client creates an implementation of an RPC interface and then sends it to the server via some other call, then the server can call back to that object.

-Kenton

On Thu, Oct 24, 2019 at 11:25 PM 林晓锋 <lxf4...@gmail.com> wrote:

Hi, @all:

    It is mentioned that "Requests and responses can go in any direction." at FAQ (https://capnproto.org/faq.html) , I would like to know is there any example of the server start requests to the client?

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