Command-Query separation in Elixir
CQS is a well-known concept from the early age of programming introduced by Bertrand Meyer in the Eiffel language. It says that every action should be either a command (that performs an action) or a query (that returns some data) but not both at the same time. It was devised to draw a clear line between performing mutations and collecting results. Meyer, Bertrand. “Eiffel: a language for software
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Designing a scalable application with Elixir: from umbrella project to distributed system
Elixir/Erlang OTP abstractions enforce developers to split programs into independent parts. While “gen_servers” encapsulate parts of business logic on micro-level, “applications” present a more general (“service”) part of the system. Complex programs written in Elixir are always a collection of communicating OTP applications. The main question appeared while developing such programs is how to spli
Réinventons la banque ensemble - Memo Bank
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Introducing Nebulex, a fast, flexible and powerful caching library for Elixir
Introducing Nebulex, a fast, flexible and powerful caching library for Elixir 14 Aug 2017 Caching might be one of the most common and used techniques to improve performance, and in Elixir there are different options available; some of them very good options. However, most of them are focused on local caching, but let’s face it, we seldom deploy our systems in a single node, it’s not a common scena
Event Bus Implementation(s) | HackerNoon
Too Long; Didn't ReadEvent driven architecture pattern is a distributed asynchronous architecture pattern to create highly scalable reactive applications. The pattern suits for on every level application stack from small to complex ones. The main idea is delivering and processing events asynchronously. Event driven architecture pattern is a distributed asynchronous architecture pattern to create h
Supporting multiple event stores in Commanded using an adapter based approach for Elixir - Binary Consulting
Announcing the release of Commanded v0.10 with support for using Greg Young’s Event Store. Commanded is an open-source library you can use to build Elixir applications following the Command Query Responsibility Segregation and event sourcing (CQRS/ES) pattern. The project’s README contains a useful getting started guide that covers its features and I’ve written an article on building a CQRS/ES web
Event Sourcing in Elixir
In this post we will explore how we can use some of Elixir’s more interesting features to implement event sourcing. OTP is the star of this show, enabling us to do some very nice tricks that would be practically impossible with Ruby. OTP stands for Open Telecom Platform, and is Erlang’s answer to the problem of concurrency. OTP relies on immutability of data to provide some very nice abstractions
Form “objects” in Elixir
Well, let’s begin with explaining the title: Form Object is a common pattern in web development which wraps user input into a convenient structure to be processed in the application. It’s basically an aggregation of an incoming payload, for the program’s convenience, with some basic casting and validation. Why did I put objects in quotes then? Because in Elixir we actually don’t have objects thems
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