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Recently, my Raspberry Pi was complaining that the disk was full. Which was strange because I just recently removed a bunch of files from there, yet df -h was reporting 99% usage. But wait, du -h --summarize was only reporting a couple gigs used instead of the whole 14Gb… What gives?

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In this post, we’ll look at a reactive solution for the Run Length Encoding problem, which is summarized (on Wikipedia) as:

A form of lossless data compression in which runs of data (that is, sequences in which the same data value occurs in many consecutive data elements) are stored as a single data value and count, rather than as the original run.

The challenge here is to perform it in a Reactive way using Reactor operators. Let’s jump in!

update 2018-03-13: Found a few shortcomings of the first implementation and added two new sections that present alternatives.

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In this post, we’ll look at how to combine the MDC feature of current logging framework with Reactor's own Context, in order to make contextualized logging possible within a reactive application.

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With Java 9 out the door, you might wonder what the future holds for Java. I do too, so I had a quick look at current JEPs and Projects candidates to see what is looming ahead (you’ll get this joke in a second 😁).

In this article I will glance at the ones that stood out to me. Keep in mind most of these are not finalized, some are even just exploratory…

Without further ceremony, let’s dive in!

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File reading, line by line in Java… It’s never been a breeze, and until Java 8 the only high level option you had was to read the lines into a List<String> 😓

Then Java 8 came along, with its Stream interface, and a Files.lines(Path) method that returns a Stream<String>. Turns out, this stream will lazily read the lines from the file, without ever having to hold the whole content of the file in memory 😍

Let’s see how we can use that with Reactor!

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Recent and Upcoming Talks

More Talks

Talking at SpringOne Platform 2017

2017-12-03, SpringOne Platform 2017

Talking at JavaDay 2017

2017-11-04, JavaDay Kiev 2017

Selected Talks

A look at how to start contributing to Open Source, and tips to be a good open source citizen
MiXiT 2017

Discover Reactive Programming and the Reactor 3 API
Various Conferences