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  • Why Acceptance Tests Matter

    While consulting on a migration project I was refactoring the way to load country reference data when I noticed some oddities in the business rules for formatting phone and fax numbers. I had changed from loading based on hard-coded country codes to using an Enum and mapping it to the correct instance...
    Posted to Ative at Work (Weblog) by Martin Jul on 10-06-2006

  • Bug-by-Bug Compatibility

    When you are porting an old system you will often be confronted with the pragmatic decision to be bug-by-bug compatible with the old system at the integration points, since it is sometimes not feasible to fix the bugs in the clients to the system. On the other hand, we have the principle of "Don't...
    Posted to Ative at Work (Weblog) by Martin Jul on 09-29-2006

  • Don't Port the Dead Code

    Once upon a time when Gildenpfennig and I were porting a mainframe to .NET we received specifications for one of the integration points - to another mainframe that would still be running. So we set forth and started implementing. More and more "protocol" ("services" in modern lingo...
    Posted to Ative at Work (Weblog) by Martin Jul on 09-22-2006

  • Don't Propagate a Bad Decision

    If you get data in a weird format, don't let that mistake propagate into your app. For example, I once worked on a legacy system that received data from an external source in a CSV file. Dates in this file were, split into three columns: day, month and year. Surprisingly this had led the system's...
    Posted to Ative at Work (Weblog) by Martin Gildenpfennig on 09-15-2006

  • Notes on Mainframe Migration

    Migration projects are often initiated with the objective to save on operational cost. And due to the ridiculous price of keeping a mainframe going the business case is often very attractive. The savings from this alone leads to the decision to do a one-to-one conversion to a lower cost platform such...
    Posted to Ative at Work (Weblog) by Martin Jul on 09-12-2006
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