General Performance Tips
Performance is a mystical thing our systems must have. But as with most things in software engineering, there is no clearly defined set of steps that have to be followedContinue reading
TLS Client Authentication
I decided to do a prototype for an electronic identification scheme, so I investigated how to do TLS client authentication with a Java/Spring server-side (you can read on even ifContinue reading
Setting Up CloudFront With S3
Yesterday I decided to setup CloudFront for Computoser. I store all the generated tracks in AWS S3, and every time a track is played or downloaded, I was making aContinue reading
Retryable operations
In every project that I’ve worked on, there’s always a need of a certain piece of functionality: retrying an operation. Normally it’s about calls over the network that can failContinue reading
Common Sense Driven Development [talk]
A few months ago I spoke on a conference (jPrime) about common sense driven development (and what it isn’t). Here’s the video: And here are the slides: As you’ll see,Continue reading
“Forget me” and Tests
Your users have profiles on your web application. And normally you should give them a way to delete their profiles (at least that’s what the European Court has decided). ThatContinue reading
Comments on The Twelve-Factor App
The Twelve-Factor App is a recent methodology (and/or a manifesto) for writing web applications that hopefully is getting quite popular. Although I don’t agree 100% with the recommendations, I ‘llContinue reading
Events Don’t Eliminate Dependencies
Event (or message) driven systems (in their two flavors) have some benefits. I’ve already discussed why I think they are overused. But that’s not what I’m going to write aboutContinue reading
Tomcat’s Default Connector(s)
Tomcat has a couple of connectors to choose from. I’ll leave aside the APR connector, and focus on the BIO and NIO. The BIO connector (blocking I/O) is blocking –Continue reading
Blue-Green Deployment With a Single Database
A blue-green deployment is a way to have incremental updates to your production stack without downtime and without any complexity for properly handling rolling updates (including the rollback functionality) IContinue reading