Cohesion vs. Coupling
“High cohesion, low coupling” is one of the most cited, and yet, most misunderstood principles in software engineering.
So in this short post, let’s explain their difference with a few easy-to-understand examples.
Architecture
How to end-to-end test microservices across bounded contexts?
There is more than one way to test user journeys that span multiple bounded contexts. Your choice depends on organizational structure, team responsibilities, and the maturity of your testing practices.
Ultimately, every part of the user journey should be tested, whether it’s done piecemeal by individual teams or centrally by a QA/cross-functional team.
In this article, let’s look at several ways you can approach this problem, depending on if you have full-stack teams or specialised frontend and backend teams. We will look at trade-offs and whether it’s best to host other teams’ services in your environment, or use mock APIs, or delegate testing user journeys to a QA team and use a dedicated integration environment for testing.
DynamoDB now supports cross-account access. But is that a good idea?
DynamoDB now supports resource-based policies, which simplified cross-account access to tables.
But just because you can, doesn’t mean you should!
Cross-account access to DynamoDB tables is almost always a smell. But as with everything, there are exceptions and edge cases. You should think carefully before you use resource-based policies to enable cross-account access to your DynamoDB tables.
In this post, let’s explore some legitimate use cases for cross-account access to DynamoDB tables.
QCon London 2015–Takeaways from “Scaling Uber’s realtime market platform”
On day three of QCon London, we were treated to some really insightful stories from the likes of Google, Atlas and Spotify. And for the first time in a while Uber is talking publically about what they’ve been up to. The challenge for Uber’s platform is that both supply (Uber drivers) and demand (riders) …
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QCon London 2015–Takeaways from “Service Architectures at Scale, Lessons from Google and eBay”
Day three of QCon London was a treat, with full day tracks on architecture and microservices, it presented some nice challenges of what to see during the day. My favourite talk of the day was Randy Shoup’s Service Architectures at Scale, Lessons from Google and eBay. Randy kicked off the session by identifying a …