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Kafka with selective acknowledgments performance & latency benchmark

  • By Adam Warski
  • 26 June, 2017
  • 3 Comments

By default Kafka can only acknowledge all messages up to an offset; with kmq, it’s possible to acknowledge individual messages. How does this impact performance & latency? Read more on … Continue Reading →


Why I started learning Emacs in 2016

  • By Adam Warski
  • 25 August, 2016
  • 35 Comments

Why learn another editor in the first place? The main role of a good editor is to not get into your way while working, and maybe even help a bit … Continue Reading →


Add a “dependencies” badge & tree to your project using UpdateImpact

  • By Adam Warski
  • 24 February, 2016
  • No Comments

Most Java/Scala/Groovy project depend on a number of libraries, these libraries depend on other libraries, and so on for many levels deep. When creating the final project bundle we end … Continue Reading →


Event sourcing + free monads = free sourcing?

  • By Adam Warski
  • 28 October, 2015
  • 6 Comments

I recently wrote about Event Sourcing and Free Monads. The natural next step is combining the two! How would a free monad adjusted for event sourcing look like? Please bear … Continue Reading →


MacWire 2.0: composing modules & cleanup

  • By Adam Warski
  • 30 September, 2015
  • No Comments

Recently we released MacWire 2.0, with a number of new features and general code cleanup. The majority of the work was done by Bruno Bieth – thanks! If you don’t … Continue Reading →


When & why to use Supler for web forms?

  • By Adam Warski
  • 30 June, 2015
  • 1 Comment

If you haven’t yet heard about Supler, it’s a Rapid Form Development library, working with your favorite Javascript frontend and Scala backend frameworks. It keeps the form definition centralized, taking … Continue Reading →


akka-stream vs scalaz-stream

  • By Adam Warski
  • 2 June, 2015
  • No Comments

I recently published a comparison of akka-stream and scalaz-stream, with code examples (same problems implemented using both libraries) on SoftwareMill’s blog.


MacWire 1.0 is here!

  • By Adam Warski
  • 7 April, 2015
  • 1 Comment

A couple of days ago MacWire 1.0 was released! If you don’t yet know what MacWire is: a light-weight and non-intrusive Scala Dependency Injection library. In fact, it’s more of … Continue Reading →


Supler update: 0.3.0 release

  • By Adam Warski
  • 19 March, 2015
  • No Comments

It’s been some time since the last release of Supler. Just as a short reminder: Supler is a Rapid Form Development library, allowing you to use your favorite Javascript frontend, … Continue Reading →


Quicklens: traversing options and lists

  • By Adam Warski
  • 14 March, 2015
  • 21 Comments

Quicklens is a small library which allows to modify deeply nested fields in case classes e.g.: modify(person)(_.address.street.name).using(_.toUpperCase), without the need to create dedicated lens objects. I got some very good … Continue Reading →


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Recent Posts


  • Kafka with selective acknowledgments performance & latency benchmark
  • Why I started learning Emacs in 2016
  • Add a “dependencies” badge & tree to your project using UpdateImpact
  • Event sourcing + free monads = free sourcing?
  • MacWire 2.0: composing modules & cleanup

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  • Quicklens: modify deeply nested case class fields
  • How do iBeacons work?
  • Clean URLs in Seam: URLRewriteFilter
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  • DI in Scala: Cake Pattern pros & cons
  • Trying to understand CAP
  • Using Scala traits as modules, or the "Thin Cake" Pattern
  • Benchmarking SQS
  • MacWire 1.0 is here!
  • Dry parameter names

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