GoCD - Slack Build Notifier

In my last post I wrote about a GoCD plugin that I've been working on. I finally got to complete it this weekend. Check it out https://github.com/ashwanthkumar/gocd-slack-build-notifier.  This is how the final result looks like

There are two features in the plugin that I'm really happy about (apart from pushing messages to slack)

1. Pipeline rules set. It is heavily inspired from the current email notification framework available as part of GoCD. Check out the "Pipeline Rules" section in README.
2. Notifier is pluggable. Slack Notifier is provided out of the box. With very little change, one can write any type of notifications transport using the existing framework. 

Overall it was a time well spent that helped me to write (which I guess is) first notification plugin in the GoCD community.

Slack Java Webhook

GoCD recently added support for notification extension point. I've started building slack notification plugin (its a WIP here). As part of that I wrote a Java client for Slack Webhooks. Although I found a java library here, which said it was published but I couldn't find it anywhere on sonatype / maven central. I can't even publish it, so I took that as an inspiration and wrote my own implementation on https://github.com/ashwanthkumar/slack-java-webhook.

Usage

new Slack(webhookUrl)
    .icon(":smiling_imp:") // Ref - http://www.emoji-cheat-sheet.com/
    .sendToUser("slackbot")
    .displayName("slack-java-client")
    .push(new SlackMessage("Text from my ").bold("Slack-Java-Client"));

It gets posted in the slack channel like below

Dependencies

For Maven,

<dependency>
  <groupId>in.ashwanthkumar</groupId>
  <artifactId>slack-java-webhook</artifactId>
  <version>0.0.3</version>
</dependency>

For SBT,

libraryDependencies += "in.ashwanthkumar" % "slack-java-webhook" % "0.0.3"

Java Utils Library

After a long time I seem to be writing Java code more often recently. A bunch GoCD plugins, code kata sessions with friends and things like that. I saw there are few things like List transformations, filter, I automatically start searching for Option / Some and None implementations. Simple solutions would be just write it in Scala, right? I know, but there are places where I wasn't. Example was GoCD plugins. Reasons being - Scala standard library is heavy and usually causes OOM on Agent without increasing heap sizes and final jar is also heavy in terms of size.

Check out https://github.com/ashwanthkumar/my-java-utils. If you find some implementations not so efficient or can be done better, please do let me know.

Features

List

• Lists#map
• Lists#filter
• Lists#foldL
• Lists#find
• Lists#isEmpty
• Lists#nonEmpty
• Lists#mkString

Set

• Sets#copy
• Sets#isEmpty
• Sets#nonEmpty

Iterable

• Iterables#exists
• Iterables#forall

Lang

• Option / Some / None
• Tuple2 / Tuple3
• Function
• Predicate

Dependencies

For Maven,

<dependency>
  <groupId>in.ashwanthkumar</groupId>
  <artifactId>my-java-utils</artifactId>
  <version>0.0.2</version>
</dependency>

For SBT,

libraryDependencies += "in.ashwanthkumar" % "my-java-utils" % "0.0.2"