*Background* I am starting on a port of my Common Lisp Cells dataflow hack <https://github.com/kennytilton/cells> (much akin to Javelin <https://github.com/hoplon/javelin> in surface semantics) to Clojure and am struggling to wrap my head around Clojure state-handling, deftype, and defrecord.
Development will be in my Jellz repository <https://github.com/kennytilton/jellz>, which for now just holds a "Cells Lite" common lisp <https://github.com/kennytilton/jellz/blob/master/src/jellz/jellz.lisp> hack similar to something I once tossed off without thinking during a presentation to Jay Sulzberger's Linux group. *Question* Cells uses a lot of state internally to keep track of dependencies and more, so I need state. Now how do I best do that The Clojure way? I think I am in good shape, from what I have read so far, because any given state change at the higher abstraction of the application model (eg, "this text-edit widget keypress slot just got a new value" already works in a way amenable to STM, including The Restart Problem: 1. We already have a global **pulse** value (serial integer) that manages consistency during propagation of the *input cell* keypress across the larger model. So *pulse* becomes one ref, yes? 2. Within dosynch: 1. Increment *pulse* 2. Now all dependent values (mediated by *formula cells*) get recalculated recursively. Anyone trying to mutate state need to do so only to refs. (Updating state in a formula is weird, but on rare occasions I close over a variable to see a bit of history.) 3. Invoke any observers: 1. If these guys mutate state, they better be refs 2. These can also write to input cells (think "falling dominoes") but are required to do so by enqueueing them for FIFO execution immediately after this one pulse has been fully executed. 3. The above may restart, but as long as everything is a ref we are good. Yes? 4. Internally, the cell data structure must also be composed of refs. I am thinking I will just make an array of refs. Is that fastest? 5. Now each cell currently serves as the slot value of a CLOS object wired with a few extra slots to support Cells. These too would be refs, I am guessing, though instead of class objects these would just be maps. Yes? How'm I doin'? Thx, hk -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
