git clone ''

(ql:quickload :molst.pisto)

pisto is a simplistic formalization of the lifecycle of stateful systems. Removes a lot of the pain related to debugging a system of many simple services as long as they can be run in a single JVM.

Getting Started

A system of, for example, simple services can be expressed in a namespace like this. ```clj (ns system.core (:require [pisto.core :as pisto]) (:require [ :as tns]) (:require [ :as wildrank]) (:require [ :as annagreta]))

;all system state (at least the state needed in order to tear down the system) will be accessible through this var after system startup (defonce system {:start-order [:annagreta :wildrank] :parts {:annagreta {:config {:db {:uri “datomic:mem://auth”} :uri {:port 8060}}} :wildrank {:config {:uri {:port 8080}}}}})

(defn restart [] (alter-var-root #'system #(pisto/restart-parts %))) (defn start [] (alter-var-root #'system #(pisto/start-parts %))) (defn stop [] (alter-var-root #'system #(pisto/stop-parts %)) (alter-var-root #'system #(pisto/clear-all-stateful-info %)))

;These should be mapped to some keyboard shortcuts in the dev environment (defn reload-and-restart (tns/refresh-all :after 'system.core/start)) (defn update-and-restart (tns/refresh :after 'system.core/start)) ```

It is then up to each part/sub system to ensure it can be started and stopped: ```clj (ns (:require [net.cgrand.moustache :as moustache]) (:require [pisto.core :as pisto]))

(defonce state nil)

(def routes (→ (moustache/app [“hello-world-resource”] (moustache/app :get (fn [req] {:body “hello world!!!”})))

(defmethod pisto/start-part :annagreta [[type {:keys [config]}]] (let [db-uri (:uri (:db config)) site-jetty-port (:port (:uri config))] (alter-var-root #'state (fn [_] {:auth-db-conn (when db-uri (connect-and-init! db-uri)) :site-jetty (when site-jetty-port (run-jetty #'routes {:port site-jetty-port :join? false}))}))))

(defmethod pisto/stop-part :annagreta [[type part]] (let [db-uri (:uri (:db (:config part))) site-jetty (:site-jetty (:state part))] (when site-jetty (.stop site-jetty)) (d/delete-database db-uri))) ```

Project Maturity

Developed primarily for my personal use. API's can change without notice.


Pisto on Clojars. If you are using Maven, add the following repository definition to your pom.xml:


With Leiningen: [pisto “0.1”]

Major dependencies


Copyright (C) 2013 Marcus Holst

Licensed under the Eclipse Public License v1.0 (the same as Clojure).