The Author Online Book Forums are Moving

The Author Online Book Forums will soon redirect to Manning's liveBook and liveVideo. All book forum content will migrate to liveBook's discussion forum and all video forum content will migrate to liveVideo. Log in to liveBook or liveVideo with your Manning credentials to join the discussion!

Thank you for your engagement in the AoF over the years! We look forward to offering you a more enhanced forum experience.

Max (7) [Avatar] Offline
Question to Roland, the author. Thanks for the book, it is very solid and pleasant to read.

Currently digesting Chapter 3 that provides an overview of concurrency abstractions.

Could you kindly comment/clarify the topic of composability of Actors (like functional composition)?

Is it possible?
What are advances (if any) in this area?
Is it relevant at all for Actor model?
What are difficulties or problems?
Any references, links?
Roland Kuhn (17) [Avatar] Offline
This is a question I am also deeply interested in, and it has not yet been fully answered. Actors are composed to form systems, but their composition does not work like for functions: functions are entirely passive entities who have no control over their own evaluation, whereas actors are active. Therefore actors collaborate where functions would otherwise be composed mathematically. Gul Agha’s thesis is an excellent read on this topic, cf.

When it comes to compositional properties and their static compile-time expression, I have written two blog articles ( and am currently working on Akka Typed Sessions. You may also find recent articles on the Akka team blog interesting.
Max (7) [Avatar] Offline
I'll dig there, never heard of Session Types. Thanks a lot.