There is always a good time for some shameless auto-promotion, so I'll mention Triggr, a package which allows one to convert R process into a fast, event-based

There is always a good time for some shameless auto-promotion, so I'll mention Triggr, a package which allows one to convert R process into a fast, event-based XML-, JSON- or even more freestyle RPC server: https://github.com/mbq/Triggr https://github.com/mbq/Triggr