Inroads to Application Development for Fedora Commons
In recent months, I have increasingly found myself connecting different Fedora developers with each other. Due to the ongoing upsurge of interest in Fedora Commons, and the constant increase in the number of projects using Fedora, it’s difficult to keep track of who is doing what. Last year, after a lively BoF at OpenRepositories, I created a page on the Fedora wiki listing Fedora User Interface Projects.This page is useful to read, but it doesn’t really answer the question “Where do I start if I want to create my own Fedora client app?”
The Fedora commons team is working hard to set up stable channels of information to help people answer questions like this. In the meantime, here is my quick rundown. This is not meant to be a definitive reference. I’m just rattling off the most salient points from the top of my head in the hope that someone will find it useful.
Java Solutions
Fedora’s APIs are entirely webservice based, so Java is not actually a necessity. Nonetheless many projects choose to implement their client applications in Java since they already have a Java stack in play on their servers.
The Fedora Client (distro)
Fedora itself is distributed with a Java Swing GUI client called fedora-admin. This is a good place to get raw components for a client app. If you download the source code for the fedora distribution, you can re-use the SOAP stubs from the fedora-admin client to connect your applications to Fedora. This pretty much gives you the same code that you would get by generating Java code from Fedora’s WSDL, but I hear that it has been tweaked by the Fedora dev team to work more smoothly.
Muradora
Muradora is a Java application created by the DRAMA team in Australia. Muradora started out as a proof of concept for the DRAMA Authentication and Authorization middleware. Since then, it has become a prominent end-user client for Fedora. Muradora does a good job of using Fedora’s existing features as much as possible. It creates really clean Fedora objects, and will also recognize new Fedora objects automatically as long as you use some very simple, re-usable RELS-EXT relationships to arrange your objects into collections.
If you want to create your own client application, Muradora is a good place to look for samples of best practices for creating and using Fedora objects.
Struts & Spring
As the Fedora Wiki reflects, there are a number of projects using Struts and Spring to create Fedora client applications. Muradora is one of those projects.
Grails, Wicket, etc.
I’ve been hearing a lot about the new RAD-inspired Java frameworks like Grails and Apache Wicket. At the moment, I’m not aware of any Fedora projects that are using these frameworks. I’m sure that will change soon.
PHP Solutions
Fez
Fez is a prominent PHP-driven frontend solution for Fedora. It is maintained by developers at the University of Queensland in Australia. I haven’t looked at the Fez code in over a year, but that might be a good place to start if you want to create your own PHP client for Fedora.
Drupal
Numerous projects are currently implementing Drupal modules for Fedora. I’ve heard about most of them informally, so I can’t list the organizations, but I can tell you that the University of Prince Edward Island is one of them. UPEI is hosting the Red Island Repository Institute this August. I anticipate that there will be quite a lot of Drupal-centric skill sharing going on there.
Python Solutions
Ben O’Steen’s work at Oxford
Ben is a rockstar. I’ve already praised him in prior posts and, honestly, his work speaks for itself. If you intend to do any work with Python and Fedora, definitely start by looking at his code. I also recommend planning for the fact that you will almost definitely want to pull his innovations into your code on an ongoing basis. The best place to get up to date information about Ben’s work is on his blog Less Talk, More Code.
Plone
I have heard about at least one substantial project doing work with Plone and Fedora. They are currently in early stages of development.
Django
I’m surprised that I still haven’t heard about anyone using Django with Fedora. This nifty framework by Adrian Holovaty hails from the world of online publishing. It was originally developed in-house by the Washington Post. Django seems like a really great framework for doing rapid application development. Due to its history in publishing, it seems like a perfect fit for quite a few Fedora use cases.
Though I still have not heard about any active projects using Django with Fedora, I have inspired some local developers here in Minneapolis to push for it in their own organization. Watch this space.
Ruby Solutions
RubyFedora
I’m pleased to let you know that the RubyFedora gem is available for download from RubyForge. This library allows any Ruby application or script to use the full REST API of Fedora 3.0. We here at MediaShelf wrote both Fedora’s REST API and the RubyFedora gem that consumes it, so the two work together really well.
ActiveFedora
ActiveFedora is a work in progress. When it’s ready, we will post it on RubyForge alongside RubyFedora. The intention of ActiveFedora is to allow Ruby developers to interact with Fedora repositories in the same ways that they currently interact with relational databases. We want developers to think of Fedora as “just another component” in their user-driven applications. We are achieving this by imitating Ruby on Rail’s ORM and database management features.
The ActiveFedora gem will lay the foundation for true, sustainable, rapid development of Fedora client applications. It will also provide a structure for figuring out and re-using best practices around Fedora’s Content Model Architecture.
acts_as_fedora
acts_as_fedora is a Rails plugin that ties Fedora into an existing Rails application. Rather than replacing the database connection completely, it adds hooks into Fedora within your database objects’ lifecycle. I’m not sure of the status of this gem. It may not be open source, and may not be actively supported. If anyone has more information, let me know.
ColdFusion Solution
At the recent JA-SIG conference, I learned about a project at Cornell University that is using ColdFusion to create a Fedora client application. For more info, check out the page on the JA-SIG website.