@learncqrs

Sharing the best content on CQRS: Command Query Responsibility Segregation.

learncqrs.com
Joined September 2022
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Fun way to think about Composition and Inheritance! Follow the YouTube channel if you're interested in #softwaredevelopment & #programming
Andrew Cairns
@andrewcairns29 Jan 2024
We can learn a lot about Software Development by playing retro games. Explore what Composition, Inheritance and what Composition over Inheritance means with a little help from our 8-bit friends! Hope you enjoy.
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What is a Command Bus? If you haven't encountered a Command Bus before, or not quite clear on it's purpose - this might help you develop an easy way to think about them. youtu.be/pXVZhFE2pbk
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What can we learn about Software Development from Retro Games? As it turns out... quite a lot! Sharing a teaser for the upcoming video:

Teaser

What can we learn about Software Development from Retro Games?

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Accidentally discovered some funky behaviour when running an artisan command - and I recommend you avoid using it!! 😅 youtube.com/watch?v=gCQRhXnp… #laravel #php

Artisan shortcuts can be dangerous for your project! #laravel #php

Don't make this mistake in your Laravel project. Laravel uses Symfo...

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Playing around with an idea to visually explain Partition Tolerance. Thinking about doing a more in-depth video about CAP Theorem, how it can be used as a design tool for distributed systems and how #CQRS relates.
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Understanding CAP Theorem is important when designing distributed systems. CQRS can avoid the limitations of CAP Theorem by splitting Reads (optimised for Availability) and Writes (optimised for Consistency) into different systems. youtube.com/shorts/DxywRiKDJ…

CAP Theorem | Distributed System Design

🔍 Dip your toes into the world of distributed systems with a short ...

youtube.com
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Fascinating talk by @UdiDahan at @ndc_conferences: "CQRS pitfalls and patterns" - particularly interesting perspective on Public/Private Responsibility Segregation. learncqrs.com/bOi45N

CQRS pitfalls and patterns - Udi Dahan - NDC Oslo 2023

As more developers apply Command/Query Responsibility Segregation to their projects, many find that it INCREASES the complexity of their systems rather than decreasing it, often without any perform...

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Wrote an integration test, got 3 people educating me why unit tests shouldn't touch the database. How is your day going?
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This guy is gonna be talking about #DDDesign and #CQRS soon. Maybe even a little #EventSourcing! youtube.com/@andrew.cairns
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Working with a legacy system presented some challenges with transaction boundaries. Be mindful of consumers with side-effects. More in my devlog: youtu.be/y67hTtS37yw

What Are Transaction Boundaries?

This is the first in a series of devlogs I'll be doing to discuss t...

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"Events are our primary mechanism for achieving consistency outside of consistency boundaries." - @heynickc learncqrs.com/dPnLxw

Projection

The article discusses the development of a Read Model for a Bounded Context, which is a separate persistence store optimized for reading data. Data is inserted into the Read Model by using Event...

learncqrs.com
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"Architecture is the translation of strategy into technology." — @DanaBredemeyer
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Shitting on SOLID has become too popular. Which principle are you so against and why? Do you like objects w/ many responsibilities and reasons to change? Modifying stable code to add functionality? Perhaps you love large interfaces? Or new'ing within your classes? You do you.
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An ACK/NACK strategy for Commands when applying #CQRS by @andrewcairns learncqrs.com/1HkVSB

ACK/NACK for Commands with CQRS

How to signify acknowledgement, or negative-acknowledgement, of Commands when applying CQRS.

learncqrs.com
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Making your Application Stable with the Outbox Pattern. In this article @DariuszGafka discusses the advantages of the Outbox pattern and why you want to persist your events at the same time as other state changes. learncqrs.com/vY7A3z

Making your Application stable with Outbox Pattern

Whenever we send asynchronous messages and modify state in database within same action, we put ourselves at risk. The risk come from the possibility that state will be persisted and message will...

learncqrs.com
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In this article, I explore what ACK/NACK protocol messages are and how they can be used with #CQRS. acairns.substack.com/p/ackna…
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Replying to @boyney123
Marvel Snap uses CQRS, event sourcing, recomposing on client. Only within a 1v1 game session, and pinned to a version. We avoided schema versioning problems that way. IME it's great for short lived uses or archival-only, difficult if long lived + you plan to interpret the events.
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Bringing idempotency to a distributed reactive system is a considerable challenge. What do I mean by idempotency treatment? Absolutely is not a message HASH or GUID control. Modeling Uncertainty is the more efficient way to deal with this... #DDDesign
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Great read from the engineering team at @AutoTraderLife: Real-Time Personalisation of Search Results with Auto Trader's Customer Data Platform Broadcasting user behaviour events. Derived data. API gateway. Lots of goodness. learncqrs.com/wp2dCa?list=ar…

Real-Time Personalisation of Search Results with Auto Trader's Customer Data Platform

Engineers from Auto Trader explain how they use User behaviour to improve the quality of search results for customers. An interesting article exploring events, relays, derived data projections,...

learncqrs.com
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Nice concise introduction to #CQRS and #EventSourcing with - The Dynamic Duo: Event Sourcing and CQRS by @marat_mif learncqrs.com/8HoqGv?list=ar…

The Dynamic Duo: Event Sourcing and CQRS

A quick and simple overview of what CQRS and Event Sourcing is.

learncqrs.com
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