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For All You Know, It’s Just a Java Library

Blast from the past… I wrote this in May, 2008… and I’ve gotta say, I was pretty spot-on including Java 8 adopting some of Scala’s better features: It’s ...
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Use Cases for Elasticsearch: Index and Search Log Files

In the last posts we have seen some of the properties of using Elasticsearch as a document store, for searching text content and geospatial search. In this post we will look at how ...
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Scala and Java 8 type inference in higher order functions sample

One of the concepts mentioned in the Functional Programming in Scala is about the type inference in higher order functions in Scala and how it fails in certain situations and a workaround ...
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Akka Cluster with Docker containers

This article will show you how to build docker images that contain a single akka cluster application. You will be able to run multiple seed nodes and multiple cluster nodes. The code ...
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Test your Dependencies with Degraph

I wrote before about (anti)patterns in package dependencies. And of course the regular reader of my blog knows about Degraph, my private project to provide a visualization for ...
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Making the Reactive Queue durable with Akka Persistence

Some time ago I wrote how to implement a reactive message queue with Akka Streams. The queue supports streaming send and receive operations with back-pressure, but has one downside: ...
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Explicit Implicit Conversion

One of the most common pattern we use on our day to day is converting objects from one type of object to another. The reasons for that are varied; one reason is to distinguish between ...
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Option.fold() considered unreadable

We had a lengthy discussion recently during code review whether scala.Option.fold() is idiomatic and clever or maybe unreadable and tricky? Let’s first describe what the problem ...
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Scala Maps and Sorting

This is blog entry originally written in the middle May 2014. I also seem to writing this code every 3 months or so and then I forgot. So I need a trigger to remember exactly how to ...
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Scala for-comprehension with concurrently running futures

Can you tell what’s the difference between the following two? If yes, then you’re great and you don’t need to read further.                 Version ...
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