CQS stands for the command query separation. There’s a chance that you may have not heard about it, but on the other hand the CQRS might ring a bell. Even though these 2 patterns have very much in common, there is a significant difference (definitely a bigger one than the additional “R” character within the CQRS acronym) in how do they apply to the architecture of our system. In this post I’ll focus on the CQS – the older brother of the CQRS – that will help you understand how to design the software that...