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Architecture & Design Follow 898 Followers

Selecting an Event Architecture

by Jan Stenberg Follow 10 Followers on  Aug 24, 2017

When designing a distributed system, maybe based on microservices, and you are considering an event architecture, there are several models and technologies available. When choosing how to implement the architecture the non-functional requirements are a main factor, David Dawson claims when describing different styles of event architectures in a recent blog post.

Architecture & Design Follow 898 Followers

Process Managers in Event-Based Systems

by Jan Stenberg Follow 10 Followers on  Jul 28, 2017 1

Publishing events to notify about changes in a domain keeps different domains decoupled from each other, but if there really is a logical flow of events it becomes implicit and hard to follow. A better solution is to use a Process Manager to keep track of the overall process, Bernd Rücker stated in his presentation at this year’s DDD eXchange conference.

Architecture & Design Follow 898 Followers

Capture - Embed - Protect, Guidelines for Domain-Driven Design

by Jan Stenberg Follow 10 Followers on  Jul 07, 2017

When using the core philosophy and the practices of DDD as guidelines for software design and development, they can be summarized in three principles: Capture – Embed – Protect, Steven A. Lowe claimed in his presentation at this year’s DDD eXchange conference. Capture the domain model. Embed the model in the code. Protect the domain model from corruption from other domains.

Architecture & Design Follow 898 Followers

The Importance of Patterns in DDD

by Jan Stenberg Follow 10 Followers on  Feb 28, 2017

There are lots of patterns outside of Domain-Driven Design (DDD) that are important to know, and they will help you design better systems, Cyrille Martraire claimed in his presentation at the recent DDD Europe Conference in Amsterdam when discussing the importance of patterns.

Architecture & Design Follow 898 Followers

Eric Evans: DDD is Not for Perfectionists

by Jan Stenberg Follow 10 Followers on  Feb 15, 2017

A problem with Domain-Driven Design (DDD) since the beginning has been the too common hunt for perfect designs, but DDD is not for perfectionists. In order to stop that hunt you need to have some idea of how to create software that is well designed, yet not perfect, Eric Evans noted in his presentation at the recent DDD Europe Conference in Amsterdam.

Architecture & Design Follow 898 Followers

The Dangers of If Statements in Domain Logic

by Jan Stenberg Follow 10 Followers on  Feb 10, 2017 3

The if statement found in most programming languages has two major roles, validating input to protect the domain from erroneous data, and for dealing with business logic inside the domain. Unfortunately, we spend too little time managing the risks from a business or domain perspective, Udi Dahan claimed in his presentation at the recent DDD Europe Conference in Amsterdam.

Architecture & Design Follow 898 Followers

Bringing the Domain Back to Software Development

by Jan Stenberg Follow 10 Followers on  Feb 08, 2017

If you read the business press of today, you will find that the business side of the world sees IT as an impediment that holds them back. To overcome this, we need to shift focus from the machines to the domains and start reading and learning about the domains we are working in, David West noted in his presentation at the recent DDD Europe Conference in Amsterdam.

Architecture & Design Follow 898 Followers

Start with Events and DDD When Building Microservices

by Jan Stenberg Follow 10 Followers on  Dec 28, 2016 2

Domain-Driven Design (DDD) is a great technique bringing designs closer to the domains we are working in, but too often we make early decisions with a focus on structure, which is not the intention of DDD. Instead we should start with the events in a domain, Russ Miles claims when describing the advantages of going “events-first” when building microservices.

Architecture & Design Follow 898 Followers

Focus on the Process, Not on Individual Microservices

by Jan Stenberg Follow 10 Followers on  Dec 18, 2016

The key to success when working with a microservices based distributed system is to focus on the distributed process as a whole, not on the microservices themselves. The services are the least important part, Eric Ess claimed at the recent Microservices Conference in London, in his presentation on how to monitor distributed processes at jet.com.

Architecture & Design Follow 898 Followers

Behaviour-Driven Development Anti-Patterns

by Jan Stenberg Follow 10 Followers on  Sep 30, 2016 1

Behaviour-Driven Development (BDD) can help in improving how business stakeholders and software developers communicate with each other, but there are some common anti-patterns when using Cucumber to run the automated tests, which Aslak Hellesøy, Matt Wynne and Steve Tooke described in a recent discussion.

Architecture & Design Follow 898 Followers

Experiences with Behaviour-Driven Development

by Jan Stenberg Follow 10 Followers on  Sep 09, 2016 1

Behaviour-Driven Development (BDD) recognizes that software development is fundamental to businesses of today and helps to improve how business stakeholders and software developers communicate with each other, Kevin Smith claims in a recent blog post about his experiences working with BDD.

Architecture & Design Follow 898 Followers

Data is the Hard Part Working with Microservices

by Jan Stenberg Follow 10 Followers on  Aug 28, 2016 2

One of the hardest problem when creating and developing microservices for an enterprise is their data. Analysing the business domain using Domain-Driven Design (DDD) and reason about what your data represents will help in achieving a microservices architecture, Christian Posta claims in one of a series of blog posts about microservices implementations.

Architecture & Design Follow 898 Followers

Vaughn Vernon on Microservices and Domain-Driven Design

by Jan Stenberg Follow 10 Followers on  Jul 31, 2016

Although a monolith can be modeled in a respectable way, often they are turned into a big ball of mud. This is caused by multiple domain models becoming entangled within the monolith, and in Vaughn Vernon's experience this can happen within a few weeks or months, he claimed in a presentation at the Scala Days conference earlier this year.

Architecture & Design Follow 898 Followers

Experiences Using Event Storming

by Jan Stenberg Follow 10 Followers on  Jun 30, 2016

In the context of Domain-Driven Design (DDD), Event Storming is incredibly useful and valuable, Dan North claimed in his presentation at the recent DDD eXchange conference in London, explaining the basic mechanics of Event Storming and sharing his experiences from modelling different systems during the last few years.

Architecture & Design Follow 898 Followers

Eric Evans: Is Domain-Driven Design Beneficial for Software Development?

by Jan Stenberg Follow 10 Followers on  Jun 16, 2016 1

The last couple of years the interest in Domain-Driven Design (DDD) has increased, Eric Evans noted in his keynote at the recent DDD eXchange conference in London. He thinks that we are in a time when developers care more about design, partially because we are working more with distributed systems where models have a higher value.

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