DRY is about Knowledge
Have a look at these two classes: <?php // example 1 final class Basket { private $products; public function addProduct($product) { if (3 == count($this->products)) { throw new Exception("Max 3 products allowed"); } $this->products[] = $product; } } final class Shipment { private $products; public function addProduct($product) { if (3 == count($this->products)) { throw new Exception("Max 3 product
Fighting Bottlenecks with CQRS
I hadn’t done any presentations or blog posts about Command/Query Responsibility Segregation yet, even though I’ve been working with it for more than year (and have been wanting to use it for another year). Volker Dusch invited me to speak at the first ResearchGate Developer Day in Berlin, and offered me the luxury to choose any SE topic I wanted, I just had to do it. See the slides on Speakerdeck
Unbreakable Domain Models
Video Slides Abstract Data Mappers (like Doctrine2) help us a lot to persist data. Yet many projects are still struggling with tough questions: Where to put business logic? How to protect our code from abuse? Where to put queries, and how test them? Let’s look beyond the old Gang of Four design patterns, and take some clues from tactical Domain Driven Design. At the heart of our models, we can use
Extract Till You Drop
“Extract Till You Drop” is a live refactoring that I used to do at conferences and as a webinar. Abstract We’ve all seen them: applications out of control. Under the pressure of deadlines and endless change requests, with the weight of years of legacy, the code has become unmaintainable. Adding features is a slow hit and miss process. You know something needs to be done, but nobody knows how. To c
Casting Value Objects to strings
tl;dr: Cast Value Objects to strings that can be parsed back into the Value Object. I’m a big fan of Value Objects, as they are very helpful in encapsulating behavior, and communicating intent. In fact, as a friend remarked, Value Objects are the heart and soul of Object Oriented Programming. Discussing the uses of Value Objects is not what I want to talk about here though. Let’s set up two simple
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Final Classes: Open for Extension, Closed for Inheritance
Towards Modelling Processes
Practical Event Sourcing
Domain-Driven Design is Linguistic
How to read more books
Sensible Interfaces
Decoupling (Symfony2) Forms from Entities