Articles on orestkyrylchuk

Rust Testing: A Short Guide to Mocking

Sun, 23 Nov 2025 00:00:00 +0000

So you need to mock something in Rust? There are a few different approaches you can take, and the best one depends on your needs. You can either roll your own mocking implementation or use an existing crate.

Onboarding Home Assistant: Solving Smart Switch Issues

Fri, 04 Jul 2025 00:00:00 +0000

I recently had problems with smart dimmer switches that led me down a path to Home Assistant. What started as a simple switch replacement ended up being a full automation setup.

Serverless in action. Part 4: CI/CD

Sun, 03 Mar 2019 00:00:00 +0000

Part 0: Intro, Part 1: Auth and Part 2: CRUD and Part 3: Notification

Introduction

In this part, we will create a CI/CD process using AWS tools. There are a few AWS services for that:

CodeBuild - continuous integration service.
CodeDeploy - deployment service.
CodePipeline - continuous delivery service.

Is Java enum underused?

Tue, 01 Jan 2019 00:00:00 +0000

Introduction

An enum type is a special data type that holds a list of constants. An enum type variable must be equal to one of those constants. Java Enum is a type of class that is defined with the enum keyword and was introduced in Java 5. As mentioned, it’s used to define a list of constants, but is not limited to that and can also contain methods and fields.

More specific information could be found in Java enum’s documentation.

Serverless in action. Part 3: Notification

Sat, 17 Nov 2018 00:00:00 +0000

Part 0: Intro, Part 1: Auth and Part 2: CRUD

Introduction

Here we will implement the last, but not least part of our application - notifying customers that they should come to the place they are waiting for: It has two lambda functions:

Producer - sends waitees that should be notified into SQS.
Consumer - processes SQS and sends notifications to the waitees.

Serverless in action. Part 2: CRUD

Tue, 06 Nov 2018 00:00:00 +0000

Part 0: Intro and Part 1: Auth

Introduction

This section is about the core of our application - CRUD lambda functions. To remind you of the architecture: On the design above we have:

CRUD Waitlist - lambda function to handle all the operations on the waitlist.
CRUD Waitee - lambda function to handle all the operations on waitees from a specific waitlist.

Serverless in action. Part 1: Auth

Sun, 21 Oct 2018 15:00:00 +0000

Part 0: Intro could be found here.

Introduction

We start our deep dive into the architecture from the Auth section. To remind you from the previous part, it has the following design:

Serverless in action. Part 0: Intro

Sun, 21 Oct 2018 00:00:00 +0000

Introduction

Nowadays serverless architecture has become a thing in application design. The main advantage it gives us is that we don’t need to manage servers anymore, however, technically it still runs on servers. Serverless architecture became popular after the release of AWS Lambda which gave us the possibility to deploy a single function (piece of code) to the AWS environment and then execute it. This article consists of 3 parts which describe how to build a serverless application step by step.

Is there an alternative to Lombok?

Wed, 29 Aug 2018 00:00:00 +0000

Over the last few years Lombok has become one of the most used Java libraries.

Unfortunately with the latest releases of Java it has some problems Java 9, Java 10.

I won’t list all the advantages and disadvantages of it, but rather show some alternative libraries:

Fishshell, is it worth a try?

Sat, 18 Aug 2018 00:00:00 +0000

Disclaimer: This post is more like a list of notes rather than structured material.

Introduction

To be honest, before using fishshell I only used bash and it satisfied my needs, but around 6 months ago my friend suggested I try fishshell instead and it was totally worth it. Below I’m going to list some pros and cons that I discovered (some of them are pretty straightforward and obvious).