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Structural simplicity


You’ve all seen Rich Hickey’s excellent Simple-made-easy presentation, in which Mr Hickey trawls the dictionary to remind us that, “Simple,” doesn’t mean ease-of-use or intellectually un-challenging but, “Not complex or compound.” The opposite of simple is not, “Hard,” but, “Composition.” If a piece of software is simple then it is not composed of other pieces of software. We all know, ...

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Following a Select Statement Through Postgres Internals


This is the third in a series of Postgres posts that Pat Shaughnessy wrote based on his presentation at the Barcelona Ruby Conference. You can also watch the video recording of the presentation. The series was originally published on his personal blog, and we are republishing it on Codeship with his kind permission. You can also read posts one and ...

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Setting up your own VPC with AWS


When you are using AWS resources like EC2 instances they will be assigned to a default VPC. However, by using AWS it is quite easy to setup your own VPC. In this post I describe how to setup a basic configuration. This is a setup in which we have a public subnet for our servers that have to be accessible ...

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Resilient Distributed Datasets (RDDs)


In this post I’ll mention RDD paper, Resilient Distributed Datasets: A Fault-Tolerant Abstraction for In-Memory Cluster Computing. If you didn’t check my post about Spark, I strongly advice you to read it from here: Spark: Cluster Computing with Working Sets. RDD Abstraction RDDs is a distributed memory abstraction which leverages applications performance due to it is suitable for iterative algorithms and interactive ...

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Constructors in Ceylon


Since the earliest versions of Ceylon, we’ve supported a streamlined syntax for class initialization where the parameters of a class are listed right after the class name, and initialization logic goes directly in the body of the class. class Color(shared Integer rgba) { assert (0 <= rgba <= #FFFFFFFF); function encodedValue(Integer slot) => rgba.rightLogicalShift(8*slot).and(#FF); shared Integer alpha => encodedValue(3); shared ...

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R: Scraping Neo4j release dates with rvest


As part of my log analysis I wanted to get the Neo4j release dates which are accessible from the release notes and decided to try out Hadley Wickham’s rvest scraping library which he released at the end of 2014. rvest is based on Python’s beautifulsoup which has become my scraping library of choice so I didn’t find it too difficult ...

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How to monitor a Java EE DataSource


Introduction FlexyPool is an open-source framework that can monitor a DataSource connection usage. This tool come out of necessity, since we previously lacked support for provisioning connection pools. FlexyPool was initially designed for stand-alone environments and the DataSource proxy configuration was done programmatically. Using Spring bean aliases, we could even substitute an already configured DataSource with the FlexyPool Metrics-aware proxy ...

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Motivation And Goals Of Project Jigsaw


A couple of weeks ago I wrote about how Project Jigsaw may break existing code. So what do we get in return? Let’s look at the pain points the project addresses and its goals for how to solve them in Java 9. Series This post is part of an ongoing series about Project Jigsaw. In the recommended order (which is different ...

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Long-term log analysis with AWS Redshift


You will aggregate a lot of logs over the lifetime of your product and codebase, so it’s important to be able to search through them. In the rare case of a security issue, not having that capability is incredibly painful. You might be able to use services that allow you to search through the logs of the last two weeks ...

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