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Separate event handling into handler methods

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Nicholas Kariniemi 2014-10-10 19:03:33 +03:00
parent 52ce9ffb42
commit bef0e8d4e7
1 changed files with 42 additions and 40 deletions
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82
src/cljx/grub/state.cljx
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@ -7,51 +7,53 @@
#+cljs (:require-macros [grub.macros :refer [log logs]]
[cljs.core.async.macros :refer [go]]))
(defmulti handle-message (fn [msg out states shadow client?] (:type msg)))
(defmethod handle-message :diff [msg out states shadow client?]
(let [states* @states
shadow (sync/get-history-state states* (:hash msg))]
(if shadow
(let [new-states (sync/apply-diff states* (:diff msg))
new-shadow (diff/patch-state shadow (:diff msg))
{:keys [diff hash]} (sync/diff-states (sync/get-current-state new-states) new-shadow)]
(if client?
(reset! states (sync/new-state (sync/get-current-state new-states)))
(when-not (= states* new-states)
(reset! states new-states)))
(when-not (or client? (sync/empty-diff? (:diff msg)))
(a/put! out (message/diff-msg diff hash)))
(if client?
new-shadow
(sync/get-current-state new-states)))
(if client?
(do (a/put! out message/full-sync-request)
shadow)
(let [state (sync/get-current-state states*)]
(a/put! out (message/full-sync state))
state)))))
(defmethod handle-message :full-sync-request [msg out states shadow client?]
(let [state (sync/get-current-state @states)]
(a/put! out (message/full-sync state))
state))
(defmethod handle-message :full-sync [msg out states shadow client?]
(let [state (:state msg)]
(reset! states (sync/new-state state))
state))
(defmethod handle-message :new-state [msg out states shadow client?]
(let [{:keys [diff hash]} (sync/diff-states (:state msg) shadow)]
(when-not (sync/empty-diff? diff)
(a/put! out (message/diff-msg diff hash)))
shadow))
(defn make-agent
([client? in out states] (make-agent client? in out states sync/empty-state))
([client? in out states initial-shadow]
(go (loop [shadow initial-shadow]
(when-let [msg (<! in)]
(condp = (:type msg)
:diff
(let [states* @states
shadow (sync/get-history-state states* (:hash msg))]
(if shadow
(let [new-states (sync/apply-diff states* (:diff msg))
new-shadow (diff/patch-state shadow (:diff msg))
{:keys [diff hash]} (sync/diff-states (sync/get-current-state new-states) new-shadow)]
(if client?
(reset! states (sync/new-state (sync/get-current-state new-states)))
(when-not (= states* new-states)
(reset! states new-states)))
(when-not (or client? (sync/empty-diff? (:diff msg)))
(>! out (message/diff-msg diff hash)))
(if client?
(recur new-shadow)
(recur (sync/get-current-state new-states))))
(if client?
(do (>! out message/full-sync-request)
(recur shadow))
(let [state (sync/get-current-state states*)]
(>! out (message/full-sync state))
(recur state)))))
:full-sync-request
(let [state (sync/get-current-state @states)]
(>! out (message/full-sync state))
(recur state))
:full-sync
(let [state (:state msg)]
(reset! states (sync/new-state state))
(recur state))
:new-state
(let [{:keys [diff hash]} (sync/diff-states (:state msg) shadow)]
(when-not (sync/empty-diff? diff)
(>! out (message/diff-msg diff hash)))
(recur shadow))
(recur shadow)))))))
(recur (handle-message msg out states shadow client?)))))))
(defn make-server-agent
([in out states] (make-agent false in out states))