Mi e' tornato in mano un bel libro di Piergiorgio Odifreddi, intitolato C'e' spazio per tutti che tratta di geometria, e mi ha ispirato alcune riflessioni.

La prima, e' che benche' il liceo classico sia intriso di cultura greca, c'e' una grave mancanza, poiche' viene insegnata poco la genesi della geometria e della matematica, fortemente connesse nel mondo greco. Cosi' tanto connesse che gli Elementi di Euclide trattano non solo di Geometria, ma anche di Algebra e Aritmetica.

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On the current project, I had the need to extract the cpu limits from the deployment descriptor, sum them to check resource usage and print a report.

I need to do it on a lot of microservices, and also it can change in respect of the target environment.

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Today I have an hard time using the @Profile directive for enable feature toggle on Spring, so I decided to write a small guide on it.

Introduction

Feature toggle is a way to write your code to be able to 'turn' on/off specific modules of your (micro) service. Because Spring Autowiring can 'discover' the right service for the right need, you can easily introduce feature toggle in an Inversion of Control engine like Spring.
I am not a super fan of feature toggle, but it helped me on more than one project. Also sometimes on production delivery you have some legal constraints (like enable a service not before a specifica date) and so a dynamic, parametrized run become a must.

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