Code Archives - Codes And Notes

Published on 23 April 2020

A Java-based WebSocket Client in Spring

By Diego , In Code, Java, Spring

In my previous post, we saw how to implement a real-time notification system using WebSockets. But if you are like me, you know that’s only …

Published on 31 March 2020

WebSocket-based Notification System using Spring

By Diego , In Angular, Code, Java, Javascript, Spring

In this post I’ll examine how to implement a simple WebSocket-based notification system built on top of Spring. We’ll use the Stomp protocol over SockJS to communicate with either a JQuery-based client or an Angular application.

Published on 27 February 2020

SQLLine in Apache Ignite doesn’t start

By Diego , In Ansible, Code, gotcha!

If you’re having trouble starting SQLLine from that sqlline.sh file included in Apache Ignite distributions, please read this. This gotcha made me waste some precious time… who knows, it might save yours!

Published on 14 February 2020

Builders of test objects for hierarchies of classes

By Diego , In Code, Java

So you need to implement builders of test objects for hierarchies of classes, eh? I went down that road a few years ago, and I …

Published on 13 January 2020

Generate SSH keys using Ansible

By Diego , In Ansible, Code, DevOps

This post proposes a couple of techniques to generate SSH keys on your local host machine, using Ansible. Always useful when configuring your servers!

Published on 11 June 2019

Elliptic Curve Cryptography with OpenPGP.js

By Diego , In Code, Javascript

PGP encryption is not only about RSA keys. Elliptic Curve Cryptography (ECC) offers another twist on the subject, requiring smaller key sizes to provide an equivalent level of security.

Published on 14 May 2019

First Steps with Guice

By Diego , In Code, Java

A majority of Java developers came to embrace and love Spring’s Inversion of Control (IoC) to inject dependencies. However not all projects are Spring-based! One may want to consider alternatives for taking care of dependency injection… And one of those options is the Guice framework.

Published on 29 March 2019

OpenPGP Integration (Java and JavaScript): PGP exchange between Java and JavaScript

By Diego , In Code, Java, Javascript

At last! It was about time! Allow me to bring a conclusion to our experiments in encryption. Let’s use what we previously learned about working with PGP on Java and JavaScript and make the two exchange PGP messages.

Published on 27 February 2019

Questions you should ask during an interview

By Diego , In Opinion

You decided to apply for that position or mission and nailed the technical interview. They want you on board! That sounds great, but… before saying “yes” there might be a few questions you should ask and a few things to clarify.

Published on 27 December 2018

Expressing intent using fluent code

By Diego , In Code, Opinion

As professional developers, we constantly try to make our code readable for all to understand. We use the term “fluent code” to describe that line of thought. But beginners may find that a bit of an abstract notion… In this post I propose you to examine a concrete case I have recently encountered, and one solution for turning that bit of code into something I am proud(er) of.

Category: Code