Design of server component in Scala

Question

Suppose I need to a Scala component to process incoming requests concurrently and return the processing results. Suppose also that the request processing consists of a few steps. Some of the steps are resource and time consuming, some of them are either I/O or CPU-bound, etc.

Assuming that requests come from inside the JVM I would design the component as follows:

• actor "Facade" is the entry point: it receives requests and sends the results to the clients.
• actor "Dispatcher" execute processing steps asynchronously with Futures, which wrap the steps
• steps send their results back to the "Dispatcher" actor. It's implemented with Future callbacks.
• When the request processing finish "Dispatcher" sends the results to "Facade".

Does it make sense? Are there any good examples of such a component in Scala?

Answer 1

It makes sense given the details you showed.

A good framework for such case would be Akka. See the examples available in the source code, and the many open sourced projects in GitHub.