January 6th, 2019
When you are identifying service boundaries, it’s not enough to consider the domain model alone. There are other, more pragmatic concerns to bear in mind.
November 27th, 2018
ArchUnit is a java library that provides a fluent API for creating self-testing architectures via unit tests. A similar library can be written for .Net Standard that acts on compiled assemblies rather than raw code.
October 12th, 2018
Event-driven integration can improve the scalability, resilience and scalability of distributed applications… but this does depend on the design of your event messages…
August 12th, 2018
Twelve factor apps provide a methodology for building apps that are optimised for modern cloud environments. It’s only been achievable in the Microsoft world since the advent of .Net Core.
July 29th, 2018
It’s easy to get caught up in unrealistic notions that you can re-write a legacy system or gradually decompose it. There are other, more pragmatic approaches that can help to modernise architectures and enable new development.
February 16th, 2018
Agile teams still need to make architecture decisions, but in supporting them architects should seek “just enough” architecture over “big design up front” and practical solutions over large-scale abstract thinking.
January 28th, 2017
No architect will ever admit to being out of touch with software development. However, unless you are writing code then it’s difficult to avoid becoming an “ivory tower” or “PowerPoint” architect that can only discuss systems in the abstract.
January 7th, 2017
Event stores and event sourcing are a powerful idea, but they can be vulnerable to a number of technical and operational challenges when faced with real world complexity.
July 29th, 2016
Event sourcing can scale very nicely, though this does depend on a number of key design decisions for the underlying event store.
March 9th, 2015
We know that micro services are small and focused by design – just how small is this in practice?
January 4th, 2015
REST is sometimes described as the next “evolutionary step” in service integration. The problem is that REST provides too much of a “dumb pipe” to support genuinely decoupled, fault-tolerant service integration.
November 22nd, 2014
Debates on the finer points of REST can bring out the worst in people as they seek to define what is and is not “RESTful”. In most cases the debate is unlikely to make the difference between success and failure for an API.
August 21st, 2014
When developers first start using messaging they can be tempted to use it as a brand new hammer for every nail. Messaging brings a lot to the party, but it isn’t necessarily a suitable transport for fast, synchronous query processing.
July 9th, 2014
An architecture based on tiers or layers is too inflexible to deal with the more flexible demands of modern systems, particularly when you working with high-volume systems that require distributed processing.
June 12th, 2014
There’s nothing really new about many of the ideas that underpin microservices. Are they just an agile re-branding of SOA?
May 4th, 2014
Developers who have been brought up on the certainties of ACID transactions often have a problem trusting eventual consistency. Once you start exploring the requirements in more depth this really so much of a handicap.
April 21st, 2014
Structured and “Hackable” URIs are a staple part of SEO-friendly websites. Although developers generically expect to see them in HTTP-based APIs, they should be irrelevant to consumers of a fully RESTful API that leverages HATEOAS.
March 12th, 2014
Agile principals encourage self-organising teams to take ownership of solutions. This doesn’t leave architects out in the cold, but it does require a more engaged role based on influence rather than governance.
February 21st, 2014
Lean development’s “last responsible moment” should address uncertainty, not justify procrastination
Deferring decisions to the “last responsible moment” can help you to adapt to the inevitable uncertainty that comes with agile development. The risk is that it can become an excuse for uncertainty that undermines development velocity.
January 13th, 2014
Every system has some level of coupling. After all, systems need to collaborate and in doing so they will inevitably share some characteristics of language and behaviour. It’s important to recognise where coupling occurs and the impact it has on stability and flexibility.
February 22nd, 2013
Shared databases risk turning into performance bottlenecks that encourage close-coupling and create a single point of failure. There’s no justification for using them to integrate processes and applications.
July 2nd, 2012
Development teams can struggle with dependency injection, often because they don’t have a clear understanding of how best to use it.
April 30th, 2012
Developers and architects like to build things, so their initial impulse is often to flatten the place, lay some stronger foundations and build something impressive. It can be difficult to get them excited about incremental innovation, even when this is generally the most sensible approach from both a technical and commercial perspective.
April 11th, 2012
Despite all the best intentions, software reuse tends to be confined to third party frameworks and tools rather than being an integral part of the development process. Are we expecting too much from software reuse and should we learn to set our sights a little lower?
December 29th, 2011
Everybody would agree that quality is an important part of the software development process. However, the complexity involved in delivering quality is often poorly understood and the amount of effort it requires tends to be underestimated.