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Arbitrary Scripting Languages in XPages
Jesse Gallagher    

I think I've settled on JSR 223, the generic "Scripting in Java" specification, as the likely best way to embed Ruby. It seems like the "correct" way to do it and generally the cleanest. I don't like the notion that the way to customize the runtime is by setting system properties, so I'm still a little wary, but it'll do for now, in any event.

The side benefit of JSR 223 (and this would be true of BSF as well) is that it supports a crapload of languages, and it does so in a very unified and generic way. Accordingly, I modified my ViewHandler and created a GenericBindingFactory to browse through the list of non-Ruby available languages and create EL bindings for each.

The upshot is that, when this code is active, any JSR-223-compliant language in your server's classpath will become available for "#{whatever: ... }" bindings just by virtue of its presence. Note, though, that that doesn't necessarily mean it will be a good experience. For one, the page's variables (like param, facesContext, view, and so forth) aren't just available - you'd have to make something like the method_missing method I wrote for Ruby to automatically resolve them via FacesContext.getCurrentInstance(). Furthermore, some languages are problematic: for some reason, Jython throws NullPointerException errors for even the most basic formulas on almost every page load, while PHP still requires <?php ?> tags and spits anything else out to the server console.

I know what question is on the tip of your tongue, though, so I won't keep you waiting: yes, you can use your home-grown string-concatenation operators in Scheme! You can breathe a sigh of relief now:

<xp:text><xp:this.value><![CDATA[#{scheme: (set! + (let ((original+ +)) (lambda args (if (and (not (null? args)) (string? (car args))) (apply string-append args) (apply original+ args))))) (+ "Hello " "from " "Scheme") }]]></xp:this.value></xp:text>

Yes, that works, and no, there's no reason to do it. If you really like Lisp, though, Scheme and Clojure can now be in your XPages toolbox.

Once I'm able to post to OpenNTF, I'll include this in my first Ruby-in-XPages release, though I may leave the applicable code commented out by default. Who knows what horrors this could unleash?



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http://frostillic.us/f.nsf/posts/F660516EC59A25FC852579E5007D5F9C
Apr 19, 2012
92 hits



Recent Blog Posts
142


The Basic Xots Tasklet in the Blog
Sat, Sep 6th 2014 7:12a   Jesse Gallagher
Continuing in my two-day spat of blog posts shamelessly containing "blog" in the title, I figured I'd mention how I'm using Xots for new-comment notifications. If you're not familiar with it, Xots is a recent addition to the OpenNTF Domino API (added in the recently-released M5 RC1 build), intended to replace both agents and DOTS. There's still more work to be done on the scheduling portion, but Xots is perfectly capable of running manually-created tasks in a similar manner to Threa [read] Keywords: agent domino database openntf server
253


How I'm Handling URLs for the Blog
Fri, Sep 5th 2014 6:13p   Jesse Gallagher
As I mentioned in the introductory post for the blog, I'm putting my investigation into RequestCustomizerFactory classes to work in the blog. At its core, the point of what I'm doing is to allow me to write code like this: ...and have the generated link be something like: whatever The core of this is the ability of a RequestCustomizerFactory to specify a UrlProcessor that is used by basically every URL-generation routine in XPages to map the XSP-side URLs to their final HTML version. [read] Keywords: xpages database java server
141


New Blog Structure
Fri, Sep 5th 2014 3:13p   Jesse Gallagher
So I finally got around to re-doing my blog app after letting the previous one wither on the vine for years. The main things this new template has over the previous one are: A properly responsive design care of WrapBootstrap. Conveniently, it's the same design I use for our internal task-tracking app, so I had most of the renderers ready. Along those lines, the XSP structure is heavily based on standard/ExtLib components when at all possible, rather than putting the Bootstrap structure i [read] Keywords: development
159


(Not) My Slide Decks From MWLUG
Tue, Sep 2nd 2014 6:14p   Jesse Gallagher
At this year's MWLUG, I presented two sessions: one on using nginx as a reverse proxy and load balancer, and one on structured XPages development. Normally, the next step would be to post the slides, but my decks aren't particularly useful on their own - they were small 8-slide affairs that mostly served as a memory assistance to me, one sight gag, and then a "Demo" slide where I switched to the normal screen for the actual code. So my plan instead is to blog with the details. The latter s [read] Keywords: xpages development twitter
111


A Centralized Bean for Translation
Mon, Sep 1st 2014 2:12p   Jesse Gallagher
The normal method for doing translation in XPages is by using the built-in Designer tooling, which creates properties files for each language for each XPage in your app. This is okay, though it requires using Designer to update the properties (since apparently the translation happens as part of the build process). For the refresh of my blog I'm working on, I'm taking a different tack, inspired by the way a client does it and similar to how I do it in the Framework. Specifically, I have a cent [read] Keywords: domino ibm xpages application java javascript properties
114


Quick Tip: Use Dojo Content Panes for Speedier Initial Page Loads
Mon, Aug 18th 2014 5:13p   Jesse Gallagher
The XPages Extension Library is full of hidden gems and one I particularly like keeping in my back pocket is the control. It's a fairly unassuming control; like the rest of the components in the "Dojo Layout" category, it takes its name and basic concept from the underlying Dijit. However, you don't have to use it in a full Dojo layout - and, in fact, all of the actual layout types have more-appropriate XSP components. Presumably, its initial use is to load content from a specified UR [read] Keywords: xpages database dojo javascript network properties
109


My Sessions at MWLUG This Year
Mon, Aug 18th 2014 1:13p   Jesse Gallagher
As I mentioned at the end of this morning's post about SSL and reverse proxies, I'm going to be giving a session on using a reverse proxy in front of Domino at this year's MWLUG next week. Specifically, it will be one of two sessions, both on Friday: OS101: Load Balancing, Failover, and More With nginx I'll be discussing the general reasons why you would use a reverse proxy - not just the aforementioned SSL benefit, but also load balancing, failover, multi-app integration, new feature [read] Keywords: domino xpages integration server
235


Domino SSL and Reverse Proxies
Mon, Aug 18th 2014 7:12a   Jesse Gallagher
Domino's SSL stack has been long-in-the-tooth and awkward to deal with for a while. Until recently, this has mostly just resulted in the sort of stilted way you have to set up SSL keychains, using the Server Certificate Admin database initially and then "IKeyMan" more and more (specifically, an old version you need 32-bit Windows XP for, like a barbarian), but the job eventually got done. However, as a post from Steve Pitcher points out, this is becoming rapidly impractical. While I gen [read] Keywords: admin domino ibm database development server smtp websphere
164


Quicker Tip: Lowering XPage Build Overhead When Using Jars
Thu, Aug 14th 2014 1:13p   Jesse Gallagher
(Caveat: I don't actually know if this matters with the Jar design element in 9.0+, since the only times I've needed it are with clients using obsolete versions) If you use Jar files stored in an NSF in your build path with XPages apps, you've likely noticed that it makes your build times interminable, particularly if it's a large library. From what I can tell, Designer seems convinced that it must download the entire Jar file during every build, in order to find out what's inside of [read] Keywords: xpages archive eclipse
206


Be a Better Programmer, Part 4
Thu, Aug 14th 2014 7:12a   Jesse Gallagher
This topic isn't, strictly speaking, in the same vein as the rest of this series; instead, it's more of a meandering "case study" sort of thing. But it has something of a unifying theme, if you'll bear with me: Be Mindful of Your Layer of Abstraction Basically everything about computers has to do with layers of abstraction, but what I have in mind at the moment is how it interacts with web programming. First, I'll dive into a bit of background. The original premise of HTML was that [read] Keywords: domino xpages best practice css desktop development java javascript properties server widgets




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