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Architecture & Design Follow 1867 Followers

Retroactive and Future Events in an Event Sourced System

by Jan Stenberg Follow 29 Followers on  Feb 09, 2018

When Thomas Pierrain started a new project with an asset management company, one important requirement was the ability to go back in time to understand why they took decisions that today look strange. At the recent DDD Europe 2018 conference in Amsterdam, Pierrain discussed his experiences when building an event sourced system that included some temporal challenges.

Architecture & Design Follow 1867 Followers

Evolving CQRS and Event Sourced Systems

by Jan Stenberg Follow 29 Followers on  Feb 07, 2018

After talking with people about upgrading of CQRS and event sourced systems, Michiel Overeem came to the conclusion that many working with event sourced systems lack an understanding and don’t know how to approach the problem. At the recent DDD Europe 2018 conference in Amsterdam he described how this was a trigger for him to do an exploratory research on how to evolve this kind of system.

Architecture & Design Follow 1867 Followers

Eric Evans: Practicing Domain-Driven Design

by Jan Stenberg Follow 29 Followers on  Feb 06, 2018

For Eric Evans, who gave a keynote at the recent DDD Europe 2018 conference in Amsterdam, it’s important to explore and practice building software. He enjoys working with strategic patterns in Domain-Driven Design (DDD), but what he finds really interesting is taking a difficult domain and reason about it differently; breaking out of the mental box trying to find new concepts.

JavaScript Follow 340 Followers

Firefox Quantum Commits to Cross-Browser Extension Architecture

by Kevin Ball Follow 3 Followers on  Dec 19, 2017 1

With the Firefox 57 “Quantum” release, Firefox now only supports extensions based on the WebExtensions API, joining Chrome and Edge in supporting extension development with pure HTML, CSS, and JavaScript based on a cross-browser shared extension architecture.

Architecture & Design Follow 1867 Followers

Selecting an Event Architecture

by Jan Stenberg Follow 29 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.

Culture & Methods Follow 570 Followers

First Annual Retrospective Report Published

by Ben Linders Follow 20 Followers on  Aug 07, 2017

The First Annual Retrospective Report provides a deeper understanding of how retrospectives are used in the real world. The results indicate that retrospectives lead to improved team communication and productivity and help to create an environment of trust. Major challenges are that topics discussed cannot be solved by the team and people do not feel comfortable speaking up.

Architecture & Design Follow 1867 Followers

Process Managers in Event-Based Systems

by Jan Stenberg Follow 29 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 1867 Followers

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

by Jan Stenberg Follow 29 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.

Culture & Methods Follow 570 Followers

Strategy for Mobile and Web Test Coverage

by Ben Linders Follow 20 Followers on  Jun 22, 2017

Teams need to match testing with the market usage patterns across geographies of their apps as consumers are expecting smooth apps functionality across all digital channels. Here's a methodology and index for considering device/OS combinations together with other characteristics like aging, screen parameters and other testing related guidelines for data driven test coverage of the mobile market.

Architecture & Design Follow 1867 Followers

The Importance of Patterns in DDD

by Jan Stenberg Follow 29 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 1867 Followers

Eric Evans: DDD is Not for Perfectionists

by Jan Stenberg Follow 29 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 1867 Followers

The Dangers of If Statements in Domain Logic

by Jan Stenberg Follow 29 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 1867 Followers

Bringing the Domain Back to Software Development

by Jan Stenberg Follow 29 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 1867 Followers

Start with Events and DDD When Building Microservices

by Jan Stenberg Follow 29 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 1867 Followers

Focus on the Process, Not on Individual Microservices

by Jan Stenberg Follow 29 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.

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