Kotlin – Try type for functional exception handling

Scala has a Try type to functionally handle exceptions. I could get my head around using this type using the…

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Kotlin – tail recursion optimization

Kotlin compiler optimizes tail recursive calls with a few catches. Consider a rank function to search for the index of an…

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Spring Webflux – Writing Filters

Spring Webflux is the new reactive web framework available as part of Spring 5+.  The way filters were written in a…

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Annotated controllers – Spring Web/Webflux and Testing

Spring Webflux and Spring Web are two entirely different web stacks. Spring Webflux, however, continues to support an annotation-based programming model An endpoint defined…

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Using Micrometer with Spring Boot 2

This is a very quick introduction to using the excellent Micrometer library to instrument a Spring Boot 2 based application and…

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Raw performance numbers – Spring Boot 2 Webflux vs Spring Boot 1

My set-up for the performance test is the following: The sample applications expose an endpoint(/passthrough/message) which in-turn calls a downstream…

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Kata – implementing a functional List data structure in Kotlin

I saw an exercise in chapter 3 of the excellent Functional Programming in Scala book which deals with defining functional data…

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Testing time based reactor core streams with Virtual time

Reactor Core implements the Reactive Streams specification and deals with handling a (potentially unlimited) stream of data. If it interests you,…

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Spring Webflux – Kotlin DSL – a walkthrough of the implementation

In a previous blog post I had described how Spring Webflux, the reactive programming support in Spring Web Framework, uses a…

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