Introduction to Web Application Development in Clojure

•

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My presentation about web application development with Clojure, Ring, Compojure and Enlive that I gave at JEEConf in Kiev, Ukraine - http://jeeconf.com/.

Technology

Web Application
Development
in Clojure
Jacek
Laskowski @JacekLaskowski
blog.japila.pl
Kiev, Ukraine, 24.05.2013

Map data structure in Clojure
Symbol “m” points at the map

Map in Clojure
• Map maps keys to values
• Maps are functions of their
keys
• Keywords usually keys
• assoc to add key and value
• dissoc to remove keys

“Functional” request
http://localhost:8090/

Leiningen
• Automating Clojure
projects with Clojure
• lein help when in trouble
• http://leiningen.org/

Project setup
• lein new jeeconf-clojure-webapp
• cd jeeconf-clojure-webapp
• Configure project in project.clj
• ...more soon

Ring
• Clojure library for web
application development
• HTTP abstraction = HTTP
requests are Clojure maps
• https://github.com/ring-
clojure/ring

Project’s project.clj
• Ring 1.2.0 Beta 3
• Clojure 1.5.1

Project setup cont.
• lein repl
• (use 'ring.adapter.jetty)
• (run-jetty handler options)
• (doc run-jetty) when in trouble

Ring Utils
• ring.util.response
• response
• not-found
• ring.handler.dump
• handle-dump
• ring.middleware.stacktrace
• wrap-stacktrace-web

Responds differently based on
the URI of a request
What does the handler do?

Compojure
• Clojure library for web routing
• DSL to generate Ring handler
functions
• http://compojure.org/

Project’s project.clj cont.
• Compojure 1.1.5
• Ring 1.2.0 Beta 3
• Clojure 1.5.1

Project setup cont.
• lein repl
• (use 'ring.adapter.jetty)
• (run-jetty handler options)
• (use ‘compojure.core)
• (defroutes)
• GET et al.

Compojure Utils
• compojure.route
• files
• not-found
• resources
• compojure.handler
• api
• site

Generates HTML pages based
on the URI of a request
What does the app do?

Enlive
• Clojure library for web
templates
• Enlive template is a HTML file
and a deftemplate form
• https://github.com/cgrand/
enlive

Project’s project.clj cont.
• Enlive 1.1.1
• Compojure 1.1.5
• Ring 1.2.0 Beta 3
• Clojure 1.5.1

https://github.com/jaceklaskowski/librarian-clojure
http://librarian-clojure.herokuapp.com/

Pitannja?
Jacek
Laskowski @JacekLaskowski
blog.japila.pl
Kiev, Ukraine, 24.05.2013

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Introduction to Web Application Development in Clojure

1. Web Application Development in Clojure Jacek Laskowski @JacekLaskowski blog.japila.pl Kiev, Ukraine, 24.05.2013

2. Map data structure in Clojure Symbol “m” points at the map

3. Map in Clojure • Map maps keys to values • Maps are functions of their keys • Keywords usually keys • assoc to add key and value • dissoc to remove keys

5. “Functional” request http://localhost:8090/

6. “Functional” response

7. Leiningen • Automating Clojure projects with Clojure • lein help when in trouble • http://leiningen.org/

8. Project setup • lein new jeeconf-clojure-webapp • cd jeeconf-clojure-webapp • Configure project in project.clj • ...more soon

9. Ring • Clojure library for web application development • HTTP abstraction = HTTP requests are Clojure maps • https://github.com/ring- clojure/ring

10.

11. Project’s project.clj • Ring 1.2.0 Beta 3 • Clojure 1.5.1

12. Project setup cont. • lein repl • (use 'ring.adapter.jetty) • (run-jetty handler options) • (doc run-jetty) when in trouble

13. “Functional” response

14.

15. Ring Utils • ring.util.response • response • not-found • ring.handler.dump • handle-dump • ring.middleware.stacktrace • wrap-stacktrace-web

16. Responds differently based on the URI of a request What does the handler do?

17. Compojure • Clojure library for web routing • DSL to generate Ring handler functions • http://compojure.org/

18.

19. Project’s project.clj cont. • Compojure 1.1.5 • Ring 1.2.0 Beta 3 • Clojure 1.5.1

20. Project setup cont. • lein repl • (use 'ring.adapter.jetty) • (run-jetty handler options) • (use ‘compojure.core) • (defroutes) • GET et al.

21.

22. Compojure Utils • compojure.route • files • not-found • resources • compojure.handler • api • site

23. Generates HTML pages based on the URI of a request What does the app do?

24. Enlive • Clojure library for web templates • Enlive template is a HTML file and a deftemplate form • https://github.com/cgrand/ enlive

25.

26. Project’s project.clj cont. • Enlive 1.1.1 • Compojure 1.1.5 • Ring 1.2.0 Beta 3 • Clojure 1.5.1

27. https://github.com/jaceklaskowski/librarian-clojure http://librarian-clojure.herokuapp.com/

28. Pitannja? Jacek Laskowski @JacekLaskowski blog.japila.pl Kiev, Ukraine, 24.05.2013

Introduction to Web Application Development in Clojure

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