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scala-logo

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 ...
scala-logo

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 ...
akka-logo

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 ...
scala-logo

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 ...
grails-logo

Grails Goodness: Using Converter Named Configurations with Default Renderers

Sometimes we want to support in our RESTful API a different level of detail in the output for the same resource. For example a default output with the basic fields and a more detailed ...
akka-logo

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: ...
scala-logo

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 ...
scala-logo

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 ...
groovy-logo

Java 8 Lambdas vs Groovy Closures Compactness: Grouping And Summing

Java 8 is featuring lambdas, which are similar to a construction Groovy has already for some time: closures. In Groovy we could already do this:               def ...
groovy-logo

MongoDB and Grails

So recently, I had a requirement to store unstructured JSON data that was coming back from a web service. The web service was returning back various soccer teams from around the world. ...
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