rubarb

https://github.com/dougbradbury/rubarb

This library uses two socket connections between a client and a server. One is used for request / replies from the client to the server. The other is used for remote calls made from the server to the client. Each end publishes a single object on which methods can be called by the remote end. All calls to the remote objects are asyncronous. Do not make any blocking calls in the published object. Responses are return by calling the "reply method on the responder object.