processi

about processes and engines

ruote on rails 2.0

update (2010/04/06) : this is an old post (2008), if you’re looking for ruote on rails, look at http://github.com/tosch/ruote-on-rails (rails3 branch is at http://github.com/tosch/ruote-on-rails/tree/rails3)

 

Two years ago I started writing Ruote, an open source workflow (incidentally BPM) engine written in Ruby. The immediate reaction was “how do I integrate that with Rails ? Please send me the code”. So I started writing an example Rails web application, it was initially nicknamed ‘densha’ and then renamed to ‘ruote-web’. There is a visible instance of this web application on a demo server.

But I’m not very good at web development and this was almost my first Ruby on Rails application. Time passed, I worked a lot on Ruote-Rest, a Ruby web application based on Rack (not Rails). Ruote-rest is meant to be consumed by HTTP clients that are not browsers, you could say it’s a RESTful webservice.

It is time for a second take at Ruote-Web. I started with a Rails plugin for easy integration of Ruote into a Rails application, it’s simply called ruote_plugin. It provides at first migration generation (workitem storage mainly, but also engine persistence via ActiveRecord instead of the filesystem if necessary) and then helper scripts for installing the engine and its dependencies under vendor/plugins/ or as gem.

The next step was building ruote-web2 on top of the ruote_plugin. Let’s note that the initial implementation of a “ruote plugin” was done by Tomaso Tosolini (who also wrote the rdbms based persistence for the process engine, Thanks a ton Tomaso !).

Ruote-web2 is way simpler than ruote-web, and it adheres to the resource structure laid by ruote-rest. It adds user and group resources though. For the user resource I didn’t look very far, I used the ultra-classic restful-authentication.

This will be an interesting packaging of Ruote for people of want to “just replace the Ruote logo and place theirs” to benefit immediately from a simple and robust open source workflow engine/suite (I’m quoting someone in the community for the “just replace the logo” thing).

Ruote process definitions can be expressed as XML, Ruby and now even JSON (or YAML if you push). I plan to integrate process definition tinkering into ruote-web2 (as I did in ruote-rest) and maybe more. That should mean edition of process definitions in the process portfolio and edition of definitions of processes in-flight (already implemented in ruote-rest).

The hardest part part of this implementation work is the QA, not only the classical QA but also the QA triggered by this goal : I’d like to have the same (RESTful) interface for ruote-rest and ruote-web2. The “connectedness” aspect deserves a big share of the design (and then QA) work.

Ruote-web2 is more perhaps “ruote-rest on Rails” than “ruote-web take 2”. There is a consequent amount of work left, but I’ll probably be done in three or four weeks.

It’s open source after all, so here are some links to the source of these tools :

http://github.com/jmettraux/ruote_plugin
http://github.com/jmettraux/ruote-web2

http://github.com/jmettraux/ruote

And finally to the mailing list :

http://groups.google.com/group/openwferu-users

Written by John Mettraux

September 29, 2008 at 1:38 pm

4 Responses

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  1. “Just replace the Ruote logo”? Who would say such a thing??

    Oh. :)

    This looks like a super good project, I’m very excited to see the results!

    Johnny

    October 8, 2008 at 1:52 pm

  2. :) I took it as a compliment.

    Greetings from Stockholm,

    John

    John Mettraux

    October 8, 2008 at 7:28 pm

  3. John,

    What about converging on WfXML-R and your RUOTE-REST effort?
    I would like to finalize the spec asap.
    Are you interested?
    Thanks,
    Pat.

    Pat Cappelaere

    October 31, 2008 at 4:44 pm

  4. Hello Pat,

    why not, I will try to help. Let’s discuss on the WfXML-R list.

    Cheers,

    John

    John Mettraux

    November 1, 2008 at 10:49 am


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