svSocket-package: SciViews - Socket Server
In adamryczkowski/svSocket: SciViews - Socket Server

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The SciViews svSocket package provides a stateful, multi-client and preemtive socket server. Socket transaction are operational even when R is buzy in its main event loop (calculation done at the prompt). This R socket server uses the excellent asynchronous socket ports management by Tcl, and thus, it needs a working version of Tcl/Tk (>= 8.4) and of the tcltk R package.

A particular effort has been made to handle requests the same way as if they where introduced at the command prompt, including presentation of the output. However, the server sends results back to the client only at the end of the computations. It means that any interaction during computation (for instance, using scan(), browser(), or par(ask = TRUE) is not echoed in the client on due time. If you parameterize the socket server to echo commands in the R console, such interaction would be possible from there. Another option is to run R in non-interactive mode (switching to non-interactive mode during the R session is possible by using the interactivity R package available on CRAN).

Although intially designed to server GUI clients, the R socket server can also be used to exchange data between separate R processes. The evalServer() function is particularly useful for this. Note, however, that R objects are serialized into a text (i.e., using dump()) format, currently. It means that the transfer of large object is not as efficient as, say Rserver (Rserver exchanges R objects in binary format, but Rserver is not stateful, clients do not share the same global workspace and it does not allow concurrent use of the command prompt).

See startSocketServer and processSocket for further implementation details.