CQRS-kväll med Edument

CQRS-kväll med Jonathan Worthington (http://www.edument.se/konsulter/namn/jonathan-worthington) och Carl Mäsak från Edument (http://www.edument.se/).

Det blir föreläsningar, öl och en helkväll med härliga människor. Ännu en SoftPub-succé med andra ord!

Presentationer

The Pain of Relational Dominance

By Jonathan Worthington

We all know the drill. Design a database. Write code against it, maybe helped along by some ORM. As the system grows, add more tables to the database... And where does it lead us? All too often, to databases with hundreds of tables, monolithic applications, and all sorts of other pain.

It's not that relational databases are bad per se; they're just somewhat overused, and widely misused. In this talk, I'll pick apart the causes of some of the pain this can lead to. I'll discuss why using events can help to free us from this situation, and lead to some powerful unifications. Along the way, I'll also show how the CQRS architectural pattern fits in to the picture.

Giving your saga a happy ending

By Carl Mäsak

A saga, traditionally, is a story, a heroic tale, or telling of events. The word comes from old Norse and originally meant "what is said".

In a message-based setting, a saga is a message handler. It can help uphold inter-aggregate consistency, or mediate between bounded contexts. Sagas absorb much of the complexity that was previously encoded in the domain model as foreign keys and immediate consistency — which often led to rigid, unmanageable systems.

As sagas grow in size and complexity, however, they themselves need external management. This is the point where sagas show their real strength: we get to analyze and improve the business workflow on the story level. Business concerns live directly in the code.

In this talk, Carl Mäsak shows how to build sagas from scratch, how they fit in a message-based application, how they can be used to highlight business workflows, and how to manage complex sagas.