April 25, 2020

Using Elixir's Registry for Process Pooling

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Using Elixir's Registry for Process Pooling

Source: andrealeopardi.com

This article delves into resource pooling strategy using Elixir’s Registry module. It begins with an explanation of two common pool types: checkout pools and routing pools. Checkout pools allow exclusive resource uses by callers, suitable for non-shareable resources. In contrast, routing pools enable shared resource usage and use a variety of strategies to route callers to these resources. Leopardi discusses the advantages of both types and presents a use case for each, emphasizing the role of HTTP/1 and HTTP/2 connections. The article then guides readers on creating routing pools, starting by examining a resource example involving GenServers managing TCP sockets. It provides a detailed code walkthrough for setting up a registry-based routing pool with random routing and explores how to supervise the pool's connections with a layered supervision strategy to handle crashes. Leopardi also presents an optimization for handling disconnected resources by registering and unregistering connections based on their status. The discussion moves on to round-robin routing as a more robust strategy using an ETS table to track resource selection. The article concludes by reflecting on the complexities of pool building, providing a comprehensive look at the distinctions between checkout and routing pools.

Combining Example-Based and Property-Based Testing in Elixir

Andrea Leopardi believes that example-based tests and property-based tests are like good friends. By combining the ability of property-based testing to test a wide range of input data with practical example-based tests, you can ensure that your code behaves as expected on real inputs and discover unhandled corner cases. Leopardi shares an example of how this technique can be used and emphasizes the effectiveness and practicality of this approach.

Jan 09, 2022

Structured Logging in Phoenix Applications

Sophie DeBenedetto provides a guide on configuring a Phoenix LiveView application to use a structured logger with logfmt format and how to integrate it with AppSignal for log correlation. The post emphasizes the benefits of structured logging and offers tips on optimizing logging in Phoenix applications.

Jul 18, 2023

Understanding GraphQL Subscriptions in Elixir with Absinthe

In this blog post by Sapan Diwakar, he introduces readers to Absinthe, a toolkit for building a GraphQL API with Elixir. He explains the basics of GraphQL, the schema of a GraphQL API, and how to set up an Elixir app with Absinthe.

Aug 08, 2023