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"

JSFoo Chennai Runup Event

Interesting times it has been a last few months. One of 'em was JSFoo Chennai Runup event at Indix office.

I wrote a blog post (my first official blog post, yay!) on our blog that summaries the event.

Our Chennai Office Hosted a Run-up Event for @hasgeek @jsfooindia 2014. Read About it on Our Blog. @_ashwanthkumar http://t.co/l1AfuvdQ9U

— Indix (@Indix) September 11, 2014

User ID Normalization from Big Data book using Scalding

Thanks to my mentor, I have been following Big Data book closely in MEAP. On Chapter 6, he talks about the User Identifier Normalization problem, which is an iterative graph algorithm. He provides a reference implementation using Cascalog.

Since I have been using Scalding close to a year now. I re-wrote the same in scalding. This is my first attempt in writing an iterative algorithm using scalding.

Any kind of feedback is highly appreciated.

Thrift Notes on Default values

I have been using Apache Thrift at production for close to 2 years now and something that we did not know for a long time was how to assign default values to thrift's collection types like map, list, set.

It so seems that Thrift IDL default value assignments can be JSON style values.