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Event Sourcing applied – the application service

In my previous posts I revisited Event Sourcing (ES) and introduced in detail how I apply ES when implementing the aggregates of a domain model. In this post I want to talk about the application services that are the hosts … Continue reading 

Posted in architecture, DDD, design, Event sourcing, How To, patterns, practices | 1 Comment

Workshop about Event Sourcing

In my last two posts (here and here) I am talking about Event Sourcing. Now I am very pleased to announce that on Saturday June 20th I will be leading a free workshop about Event Sourcing. Yes, the workshop is … Continue reading 

Posted in Elasticsearch, Event sourcing, GetEventStore, learning, MongoDB, workshop | Comments Off

Event Sourcing applied – the Aggregate

This is my 100th post – I have to open a good bottle of wine tonight! In my last post I was presenting my thoughts about event sourcing (ES) as an architectural pattern. In this post I want to show in … Continue reading 

Posted in Uncategorized | 1 Comment

Event sourcing revisited

Event Sourcing (ES) over the last few years has become one of my favorite architectural patterns when implementing a complex line of business (LOB) application or a complex component making part of a LOB application. Attention – paradigm change! It … Continue reading 

Posted in architecture, DDD, design, Event sourcing, How To | 1 Comment

DDD – The aggregate

In my last posts I revisited domain driven design (DDD), applied it to a concrete domain and shed some light onto special scenarios (here and here) and how one could possibly solve them using DDD. In this post I want … Continue reading 

Posted in architecture, DDD, design, How To, patterns, TDD | 2 Comments

DDD – Special scenarios, part 2

In my last post I discussed possible solutions for two specific problems when using DDD. In this post I want to analyze more Collaboration of aggregates Aggregates in DDD are very self centric or self focused. An aggregate does not … Continue reading 

Posted in architecture, DDD, design, How To, practices | 1 Comment

DDD – Special scenarios, part 1

Introduction In the last two posts (here and here) I first revisited domain driven design (DDD) in general and then I showed how we apply DDD on a realistic sample domain. For most people DDD sounds very compelling but as … Continue reading 

Posted in DDD, design, How To, practices | 1 Comment

DDD applied

Introduction In my last post DDD revisited I talked about what is important when using domain driven design (DDD) as an architectural pattern. I have had the pleasant surprise that this post was event mentioned on InfoQ. Today I want … Continue reading 

Posted in architecture, DDD, How To | 2 Comments

CQRS Workshop – Retrospective

Introduction Today I had the honor of leading the first of a series of workshops at ClearMeasure. The topic of this workshop was CQRS. After a brief introduction into the topic the attendees were working in teams of 2 to … Continue reading 

Posted in architecture, CQRS, design, How To, introduction, learning, practices, workshop | 1 Comment

DDD revisited

Introduction Way too many times I encounter applications that claim to have a domain (model) and that domain driven design has been used to develop it, but in reality what I find is a collection of entities or shall I … Continue reading 

Posted in DDD, design, How To, practices | 2 Comments