In a previous post I showed you some pseudo code Gregory Young mentioned in his DDD CQRS course I attended in Krakow, Poland. In this course Greg made clear to us locking of databases isn’t necessary. He showed us some pseudo code how to easily write a merge handler to handle all concurrency conflicts.
In my current project, based on the ncqrs-framework I implemented a simpler version of this merge handler which only retries each command if a ConcurrencyException occurs. To achieve this you can easily build a wrapper around the ncqrs commandservice.
I’m still searching for a better name for my class, because SafeCommandExecutor isn’t the best name I think. So let me know if you have a better one. I hope this article will be useful for you guys. As always, please share…
If you improved my code let me know, so I can learn from it.