An introduction to unit testing: Step-by-step walkthrough

by Leon Cullens 22. februari 2012 19:34

Now that you probably have a good grasp on the basics of unit testing, you probably want to see some examples that put all of this knowledge together. This chapter will do just that; I built a little simple ASP.NET MVC 3 application that allows us to withdraw money from an account, deposit money on an account and transfer money to another account. I kept everything very simple, ignoring lots of best-practices to keep the unit testing as easy as possible. More...

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An introduction to unit testing: How to build a testable architecture?

by Leon Cullens 11. februari 2012 16:48

In order to be able to test your software without applying many dirty hacks, you have to embrace a couple of architectural patterns that allow you to isolate the pieces of code that you want to test. I will explain a few principles that are crucial if you want to build good, testable software. More...

Simple explanation of the Repository pattern

by Leon Cullens 10. januari 2012 19:44

One of my favorite design patterns is the 'repository pattern'. That's why I decided to dedicate a complete blog post to it. Using the repository pattern in your application can yield a lot of benefits, such as improved testability, easier ways to implement caching and transactions, avoidance of code duplication and it allows you to replace the data source easier (although that probably won't happen too often). More...

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Design patterns

Fixing MySQL's InnoDB poor COUNT() performance in 3 easy steps.

by Leon Cullens 21. december 2011 09:36

During my internship at sound of data I had to build a management interface that enabled the user to view the push messages our platform (IRIS) sent to our clients. The amount of messages we are sending on a daily base are immense, so I had to come up with a good way to display this data pretty much on the fly. I ran into a lot of issues (all of which I've fixed), but the main problem was MySQL's InnoDB very poor COUNT() performance when iterating through ~2 million lines of test data I've inserted into the database. I found a nice work-around for this problem that speeded up querying the amount of rows in the database by a factor ~million. More...

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Name: Leon Cullens
Country: The Netherlands
Job: Software Engineer / Entrepreneur
Studied: Computer Science 
Main skills: Microsoft technology (Azure, ASP.NET MVC, Windows 8, C#, SQL Server, Entity Framework), software architecture (enterprise architecture, design patterns), Marketing, growth hacking, entrepreneurship


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