Clojure Web Development Essentials by Ryan Baldwin

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By Ryan Baldwin

If you've gotten already labored with Clojure and enjoyed its concise syntax, and need to begin constructing net apps with it, then this ebook is for you. This ebook is a beacon of sunshine, the robust sign to noise ratio that would get you up and operating. It s top in case you have at the very least a little of expertise constructing net apps, simply so your brain is round the statelessness of all of it. You ll additionally are looking to have just a little adventure with Leiningen, the preferred Clojure construct software.

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Test-routes :refer [test-routes]] …) 2. Finally, add the test-routes to the list of routes in the call to app-handler: (def app (app-handler ;; add your application routes here [home-routes test-routes base-routes] We've now created and incorporated a new routing namespace. It's with this namespace where we will create the rest of the routing examples. [ 45 ] URL Routing and Template Rendering Anatomy of a route So what exactly did we just create? We created a Compojure route, which responds to any HTTP method at /req and returns the result of a called function, in our case a string representation of the original request map.

For example, our application configures various Timbre logging appenders and initiates the session manager. (defn init "init will be called once when app is deployed as a servlet on an app server such as Tomcat put any initialization code here" [] ;…snipped for brevity… ) This initialization hook is configured for use either in the project configuration or through the REPL (discussed later). handler/destroy defines the shutdown hook to invoke immediately before exiting. The application shutdown hook is a function that performs anything our application needs to do before it permanently exits, such as stopping the session manager, or emitting a log statement stating the application is shutting down: (defn destroy "destroy will be called when your application shuts down, put any clean up code here" [] ;…snipped for brevity…) The shutdown hook is configured for use either in the project configuration, or through the REPL (again, which we'll discuss shortly).

Rolling namespace. snipped for brevity... ) [ 40 ] Chapter 3 To add a rolling appender, we will use the assistance of the rolling/makerolling-appender function, which returns a rolling appender map with some defaults set (:enabled? true, :min-level nil, :pattern :daily). However, we can also override these defaults by passing in an override map when we make the call, as shown in the following code snippet. handler/init function: (timbre/set-config! [:appenders :rolling] (rolling/make-rolling-appender {:min-level :info})) Next, configure the location where the log files should be emitted.

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