Recently I’ve spent a lot of time making my team’s Grafana dashboards great again. It was all nice & fun adding domain-specific metrics to the dashboard until I realized that I can’t find any values for Spring Boot system metrics like CPU usage or memory usage. What happened to them? Who stole my system metrics?! Let’s find out.
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I believe that the decorator pattern is one of the most powerful design patterns out there. It is the rule “composition > inheritance” at it’s best: it makes your classes easily testable, it allows to decompose huge classes into smaller ones, and it makes your code reusable and modular. In fact, Spring Framework relies heavily on this pattern. Unfortunately, I think that Spring doesn’t provide a really convenient way to configure decorators with it. This is the second part of how to customize dependency injection in Spring, and today we’re going to see how to make Spring’s DI respect decorators.
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I work with Spring Framework a lot. I can’t even remember a single project I had at work where I didn’t use it. There is one part of Spring that I use especially often – it’s DI (Dependency Injection). And as often as I use it, I face a situation where it turns out to be not smart enough for me. This article is a result of me trying to customize dependency injection in Spring to make it smarter as well as trying to get a deeper understanding of how does it work. I hope you’ll find it useful as well!
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In my team we’re using Docker a lot, especially in pair with testcontainers. When we’re running functional tests locally, there might be spinned up localstack, WireMock, Postgres and a container with the service itself. Running them all at the same time as well as the tests might heat up your laptop a lot, as well as make it next to unusable for quite some time. Luckily, thanks to having Linux on my laptop, this issue can be solved using CGroups.
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