A subtle clash-of-namespace bug in Commerce

Recently I got the opportunity to do Sitecore’s “Implementing Experience Commerce” training course, and get certified in the details of how Commerce works these days. While I was doing the lab exercises for the course I hit an interesting bug, which seemed like just the sort of thing that others might encounter.

So if you’re extending the Commerce OData APIs, watch out: Continue reading


Thinking about errors in code pipelines

A while back I wrote a couple of posts on the subject of how code pipelines can work in a more functional .Net world. I’ve made use of those patterns in some code of my own, and I’ve found these posts have generated quite a lot of questions from readers here and followers on twitter. But I’ve never been quite happy with the implementation in my own code… Continue reading

Simple background scheduling

Every so often I come across the need for some simple code to schedule a bit of work in the background of an application. Sometimes because a service (for integration tasks, perhaps) needs to kick off processing every so often, or sometimes because some background part of a larger program needs to happen in parallel with the main execution. A common part of these requirements is that the task should run every so often, but two instances of the task should not overlap no matter how long the background processing takes.

A few times I’ve come across projects with subtly broken implementations of this requirement, so I thought I’d write down a simple approach that has worked for me. That way next time I need it, I won’t have to go digging through git repos… Continue reading

Spotting common challenges when you’re doing performance tracing

I find myself doing quite a lot of work on performance for Sitecore websites at the moment. Whenever I do a similar job for a group of clients, I start to spot patterns in the sites I’m working on – and it struck me that there are some common performance issues that can be spotted just from the overview graphs you see when you collect trace data.

So to try and help you all improve the sites you ship, here are three that I’ve come across in a few projects recently: Continue reading

An experiment with automatic tests

I spent some time working with some code recently, which had some annoying habits of failing oddly in scenarios where nulls got passed into constructors. While I was trying to work around some of these issues, it struck me that tests for parameter handling for constructors are one of those annoying things that tend to make unit testing frustrating. They’re annoying boiler-plate to write if you need them, and then a constructor signature changes, you end up with a lot of make-work test changes to do.

So as an exercise in “learning something new”, wondered whether I could automate them in a reasonable way… Continue reading

Chasing down a browser detection bug

A colleague of mine recently hit upon an odd issue with the Sitecore integration for the 51Degrees browser detection service. It worked fine for most of his testing, but raised an exception in some circumstances. Trying to dig into this and create a test to demonstrate the bug kept us amused for a few hours – maybe it will help you to? Continue reading