Metadata as Parameters to Stylesheets

How to pass parameters into a stylesheet when you’re using an adapter

I’m never really been all that interested in data manipulation; one of my stock phrases is it’s just data1. From an integration perspective I might never understand the business semantics around each field in your data file. The critical part of our work is to make sure that your data gets out of System A, and gets to System B in the right format. For me, the interesting part is always understanding the esoteric limitations or complexities around the communications protocol rather than the data formatting itself. This probably goes back to messing around with protocol analyzers and gender benders (not that kind; the kind that you fit to an RS232 port) when I first started.

  1. According to company lore there are quite a number of features and behaviours that are ascribed to my personality; like all things that other people say about you, I can’t quite see it myself. Still I have found myself saying It’s just data on more than one occasion. ↩︎

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The Perils Of Open Proxies

I setup an open proxy by mistake, and used iptables to filter out rogue connections

Once upon a time, a very long ago now, about last Friday, I was provisioning some new VM images kindly provided to me by our infrastructure team. Apparently I have my own dedicated ESX server (admittedly running on some old hardware they had lying around) with which to play around to my heart’s content. That environment is intended to be a replacement for this server; but truth be told I haven’t had time to migrate all the services running on this machine over. In fact I’m currently having trouble making hudson run the unit tests.

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Dynamically switching XSLT processing engines

Setting up the adapter to use both XSLT 1.0 and 2.0 in the same JVM

At the moment, for legacy reasons, the adapter ships with Xalan as the XSLT transformation engine. There are still a lot of stylesheets out that that won’t work with XSLT 2.0. If your environment is XSLT2.0 only then our recommendation has always been to switch the default transformer factory to something like Saxon using the appropriate JVM system property on the commandline : -Djavax.xml.transform.TransformerFactory=net.sf.saxon.TransformerFactoryImpl but this makes all the transforms use saxon as the XSLT processing engine.

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Embedded Scripting part 2

Using a jruby script to re-format EDI messages

This week I had the first real use case for embedding a script inside an adapter workflow. In one particular instance we were actually receiving EDI files that were terminated by an odd character; od and hexdump thought it was \0205 (0x85) but when we read the file in using a java test stub it turned out to be 0xffffff85 which was annoying to say the least.

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Advanced Adapter Error Handling

Setting up the adapter for multiple ways of handling errors

As we all know error handling within the adapter can be configured at the workflow, channel or adapter level. Most of the time we just write the original file out to something that can’t fail (well, unlikely to fail in the context of things) like the file system.

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