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appstate.cljc
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appstate.cljc
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(ns io.resonant.conjector.appstate
"Provides a convention and a set of support functions for managing application state."
(:require
[io.resonant.conjector :refer [app-component? init shutdown]]
[io.resonant.conjector.debug :refer [debug]]
[io.resonant.conjector.process :as proc]))
(def ^:private PROC-ARGS {:proc-node? app-component?})
(defn- extract-pfn [map-fn defval v]
(or (map-fn (:pdef v)) defval))
(defn app-extract
"Extracts some data from system definition. This is useful for building config/application
state schemas, configuration defaults etc."
[app-def map-fn defval]
(proc/process
(assoc PROC-ARGS :proc-fn (partial extract-pfn map-fn defval))
app-def nil))
(defn- init-pfn [{{:keys [config old-state old-config]} :data,
{app-config :config} :all-data,
:keys [pdef state app-state] :as v}]
(debug 90 :conjector.appstate.init-pfn "initialization PFN" {:init-pfn (:path v)})
(let [rslt (init pdef {:config config, :old-state old-state, :old-config old-config,
:app-config app-config :app-state app-state :state state, :init true})]
(debug 90 :conjector.appstate.init-pfn "initialization result" {:rslt rslt})
rslt))
(defn app-init
"Initializes or reloads application state. "
[app-def config old-state old-config]
(proc/process
(assoc PROC-ARGS :proc-fn init-pfn)
app-def {:config config, :old-state old-state, :old-config old-config}))
(defn- shutdown-pfn [{{:keys [config old-state]} :data
{app-config :config} :all-data,
:keys [pdef state app-state] :as v}]
(debug 90 :conjector.appstate.shutdown-pfn "shutdown PFN" {:shutdown-pfn (:path v)})
(shutdown pdef {:config config, :app-config app-config, :shutdown true,
:old-state old-state, :state state :app-state app-state}))
(defn app-shutdown
"Executes :shutdown handler for all components in reverse order."
[app-def config old-state]
(proc/process
(assoc PROC-ARGS :proc-fn shutdown-pfn, :proc-order reverse)
app-def {:config config, :old-state old-state}))