Ping @U06KD64RX

Hey @U066TMAKS, I have an implementation for clj-statecharts inside electric in production so it definitely works, but there are some tricky parts to keep an eye out for when using electric since everything is reactive. Lots of places where I ended up jumping back and forth from cljs -> clj -> cljs to get a normal control flow. This is pretty much the setup:

(let [the-fm-atom  (atom {})
      the-fm       (sc/make-machine-with-store the-fm-atom fsm/file-machine-config)
      the-fm-state (e/watch the-fm-atom)]
  (sc/start-machine the-fm the-fm-atom {:debug true}))

It's still at the "thinking about it" stage for me, but I was looking at doing this using https://fulcrologic.github.io/statecharts/

and someone actually did it in the thread you mentionned https://github.com/roterski/electric-statecharts-demo

Yes I check that demo out before I did my implementation iirc.

@U06KD64RX what are the biggest pros for using statecharts with electric? is there some things that you are able to do with statecharts that you feel like would be worse without in electric?

Well no, statecharts is a good fit for clojure regardless of electric I'd say. We just use electric everywhere now so I had to learn how to make them be friends. Most things relating to state will benefit from a state machine imho, as soon as it graduates to more than 2-3 different states. It's just a much better model to architect programs and to aid in thinking, to actually reify otherwise implicit states.

are you using them on the client, server or both?

In the client-side context only currently, but should work across.

and do you use some viz tools or text only representation of the statecharts?

Just the code. It's clear enough for me.

I kind of like the idea of being able to viz, especially to use statecharts for docs and QA but it seems like the 2 clj libs for it don't have an easy way

Yeah sometimes nice especially when you want to explain to non-coders. There is a SaaS that seems pretty nice for drawing statecharts, haven't used it for realz though and can't remember the name.

Quick google search found it: https://stately.ai/

yes it's the people behind xstate

but it's JS only and it's quite big

Yes to me it's only interesting as a visualisation tool since it doesn't output anything like clojure.

If anyone is interested: i made a similar demo using clj-statecharts instead of fulcro/statecharts https://github.com/sigvesn/electric-clj-statecharts-demo

Nice @U01E4ELDYM9

m/relieve

I have this

(->> (observe-fn input-val) 
     (m/reductions {} r/pending)
      m/stream)

in your case it might be m/latest after reductions

m/relieve after m/reductions

what does r/pending do? m/relieve will drop values you might not want that?

not my code and still yet to deep dive missionary. don't want to drop values

As far as I know, r/pending values will be short circuit by electric:

(e/defn foo []
  (let [flow-value (new Flow)
     (do-something flow-value))) ; if flow value is r/pending or r/failure?, then do-something is not called with that value