Almost any event-sourcing system is built like this. Datomic is (more-or-less) an example of this as it tracks all past transactions and keeps indexes that are aggregates of the entire state of the DB.
In addition, Greg Young introduced a event store at CodeMesh 2013 that uses this model: https://vimeo.com/84314441 Timothy On Sat, May 23, 2015 at 10:15 PM, <piastkra...@gmail.com> wrote: > I am watching this video, Stuart Sierra's 2012 talk about Functional > Design Patterns: > > http://www.infoq.com/presentations/Clojure-Design-Patterns > > His description of event sourcing for functional programming emphasizes: > ---- recreate past states > ---- recreate any past state by reducing over events > ---- just store the inputs > ---- cache any intermediate state > ---- lost of flexibility > ---- every event to the system is a data structure > ---- problem: perhaps too many data structures > > > I'm curious where is this pattern actually used? > > > > > -- > 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. > -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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.
