Command Query Notification Separation (CQNS)

Command Query Notification Separation (CQNS)

CQS (Command Query Separation) is a well known principle for disentangling method responsibilities in OO software. I had known it for quite some time, but only recently actually have taken it to heart. And now I’m really loving it. I cannot imagine doing without it....
Event Sourcing for Constructivist Software

Event Sourcing for Constructivist Software

What’s Event Sourcing (ES) for? Why deviate from the all encompassing cosy domain data models for keeping and storing application state? Why jump through all the hoops of ES and risk overengineered code? The other day I read an article about Event Sourcing by Tobias...
Eventual Consistency for Mere Mortals

Eventual Consistency for Mere Mortals

Developers shun it, if they can: Eventual Consistency (EC). Rather they jump through hoops and invest huge efforts and drive technologies through all sorts of contortions to avoid even small areas of EC in their applications. What developers love is Immediate...