UUIDs make great identifiers – ones that are, for most practical purposes, unique, easy to generate, and hard to guess. The only problem is that they are long – 256 bits, but with a textual representation that’s 36 characters. So what if they were shorter?
In my previous post, I had demonstrated how to configure a Jenkins Server using Docker. The next step is to create a Jenkins job to build some software. Now, we could just do a simple freestyle job, or a basic Maven build – but that will require configuration of Jenkins every time we want to make a new project, and that makes managing the Jenkins Server via Docker more annoying. So, instead, I’m going to use the Cloudbees Bitbucket Branch Source Plugin and create a Bitbucket Team/Project job that will create the rest of my Jenkins jobs automagically for me. A similar plugin exists for GitHub, though I haven’t looked into it.
With the upcoming end-of-life for Bamboo Cloud, I’m in the market for a new build server setup. For this1 experiment, I’m returning to an old favourite – Jenkins – paired with a potential new favourite – Docker. In this post, I describe how I’ve set up a Jenkins server in a Docker container, using the Multibranch Pipeline plugin to automatically configure a simple build2.
Equality is context sensitive. It’s very rarely as cut-and-dried as people think it is.
As a simple example, consider two $5 notes. I think everyone can agree that these notes have the same value – they are both worth $5. But are they equal?
Building properly immutable objects in Java can be annoying, especially if they’ve got a bunch of properties – too many to put into a readable constructor.1
You can implement the Builder pattern, but a lot of the time that just feels like overkill. But you don’t want to put in a bunch of setter methods, because that’s just asking for trouble. So what do you do?
TL;DR version: Don’t implement
equals() on mutable objects.
This is a post I’ve been tossing around for a couple of years, ever since a lunchtime debate with a colleague. It’s a simple statement: You shouldn’t implement the
equals() method if your object isn’t immutable.1
I had all sorts of problems getting my head around how cache files work with Hadoop. Finally, I stumbled across the answer – when you add a cache file (see HadoopMain#48), it’s available to read as a local file inside the mapper (MyMapper#36).
When running in Elastic MapReduce, the file URI can be an S3 file, using either s3://bucket/path or s3n://bucket/path – this may or may not work in other Hadoop implementations, but the general approach would work fine.
See the gist at https://gist.github.com/twasink/8813628