Clojure on the Google App Engine

http://www.fatvat.co.uk/2009/05/clojure-on-google-app-engine.html

by coglethorpe • 17 years ago

41 8 17 years ago

fatvat.co.uk

themanual• 17 years ago

thanks for the post. I was waiting for this to be setup by someone. We also have php working on the app engine http://www.webdigi.co.uk/blog/2009/run-php-on-the-google-app...

marcusbooster• 17 years ago

For the interested, here's an example of using Clojure with Compojure on the GAE: http://elhumidor.blogspot.com/2009/04/clojure-on-google-appe...

jefffoster2• 17 years ago

There is one big limitation. The GAE doesn't allow you to spawn threads, which stops one big selling point of Clojure (concurrency).

swannodette2• 17 years ago

Only _one_, you still get macros, robust data structures (for example hash-maps that take anything as a key), multimethods (dispatch on anything, not just type), lazy data structures, dynamic variables, metadata, etc. macros alone would be worth it in IMHO, the rest is just icing on the cake.

mahmud2• 17 years ago

> multimethods (dispatch on anything, not just type)

Care to elaborate? I know Common Lisp's multimethods dispatch on class and object identity

  (defmethod foo ((obj class-name)) ..)

  (defmethod foo ((obj (eql object)) ..)

The first one dispatches if obj is of class "class-name", and the second dispatches if obj and object are EQL (i.e. strictly equal by value or pointer.) and this second one allows you to do very clean switch/case style dispatching on actual values.

How does clojure do it?

Clojure on the Google App Engine

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