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reconciler.cljs
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reconciler.cljs
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(ns citrus.reconciler
(:require-macros [citrus.macros :as m])
(:require [cljs.spec.alpha :as s]))
(defn- queue-effects! [queue f]
(vswap! queue conj f))
(defn- clear-queue! [queue]
(vreset! queue []))
(defn- schedule-update! [{:keys [schedule-fn release-fn]} scheduled? f]
(when-let [id @scheduled?]
(vreset! scheduled? nil)
(release-fn id))
(vreset! scheduled? (schedule-fn f)))
(defn citrus-default-handler
"Implements Citrus' default event handling (as of 3.2.3).
This function can be copied into your project and adapted to your needs.
`events` is expected to be a list of events (tuples):
[ctrl event-key event-args]"
[reconciler events]
(let [controllers (.-controllers reconciler)
co-effects (.-co_effects reconciler)
effect-handlers (.-effect_handlers reconciler)
state-atom (.-state reconciler)]
(reset!
state-atom
(loop [state @reconciler
[[ctrl event-key event-args :as event] & events] events]
(if (nil? event)
state
(do
(assert (contains? controllers ctrl) (str "Controller " ctrl " is not found"))
(let [ctrl-fn (get controllers ctrl)
cofx (get-in (.-meta ctrl) [:citrus event-key :cofx])
cofx (reduce
(fn [cofx [k & args]]
(assoc cofx k (apply (co-effects k) args)))
{}
cofx)
effects (ctrl-fn event-key event-args (get state ctrl) cofx)]
(m/doseq [effect (dissoc effects :state)]
(let [[eff-type effect] effect]
(when (s/check-asserts?)
(when-let [spec (s/get-spec eff-type)]
(s/assert spec effect)))
(when-let [handler (get effect-handlers eff-type)]
(handler reconciler ctrl effect))))
(if (contains? effects :state)
(recur (assoc state ctrl (:state effects)) events)
(recur state events)))))))))
(defprotocol IReconciler
(dispatch! [this controller event args])
(dispatch-sync! [this controller event args])
(broadcast! [this event args])
(broadcast-sync! [this event args]))
(deftype Reconciler [controllers citrus-handler effect-handlers co-effects state queue scheduled? batched-updates chunked-updates meta watch-fns]
Object
(equiv [this other]
(-equiv this other))
IAtom
IMeta
(-meta [_] meta)
IEquiv
(-equiv [this other]
(identical? this other))
IDeref
(-deref [_]
(-deref state))
IWatchable
(-add-watch [this key callback]
(vswap! watch-fns assoc key callback)
this)
(-remove-watch [this key]
(vswap! watch-fns dissoc key)
this)
IHash
(-hash [this] (goog/getUid this))
IPrintWithWriter
(-pr-writer [this writer opts]
(-write writer "#object [citrus.reconciler.Reconciler ")
(pr-writer {:val (-deref this)} writer opts)
(-write writer "]"))
IReconciler
(dispatch! [this cname event args]
(assert (some? event) (str "dispatch! was called without event name:" (pr-str [cname event args])))
(queue-effects! queue [cname event args])
(schedule-update!
batched-updates
scheduled?
(fn batch-runner []
(let [events @queue]
(clear-queue! queue)
(citrus-handler this events)))))
(dispatch-sync! [this cname event args]
(assert (some? event) (str "dispatch! was called without event name:" (pr-str [cname event args])))
(citrus-handler this [[cname event args]]))
(broadcast! [this event args]
(m/doseq [controller (keys controllers)]
(dispatch! this controller event args)))
(broadcast-sync! [this event args]
(m/doseq [controller (keys controllers)]
(dispatch-sync! this controller event args))))