Allan MacGregor

If you work in software development, SRE, or DevOps, you’ve likely heard the terms observability, telemetry, and tracing. These concepts are crucial for understanding how applications behave in production environments, and they’re an essential part of modern software development practices. You’ve also likely heard OpenTelemetry mentioned in the context of observability. In this article, we’ll cover OpenTelemetry 101: what it is, how it works, and why it’s important for modern software development.

In our last post, we explored how Dependency Injection (DI) is a powerful design pattern that can improve our ExUnit tests. In this article, we will dive deeper into the topic of DI in Elixir, focusing on the Rewire library for Elixir projects. We will cover Rewire's core concepts, how to get started with it, and practical examples. We will also see how to use Rewire alongside Mox.

While controversial in functional programming, dependency injection can be a useful pattern in Elixir for managing dependencies and improving testability. In this, the first part of a two-part series, we will cover the basic concepts, core principles, and types of dependency injection. We'll explore its benefits in terms of modularity, testability, and maintainability. Then, we will look into a specific scenario where dependency injection can be beneficial, in this case, testing.