Derek Comartin @codeopinion Twitter profile | Pikagi

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Derek Comartin

@codeopinion

11,135

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👑 Context is King 💻 Software Architecture & Design 📺

Canada

https://t.co/x7DcgbWeiQ

Joined November 2008

Don't wanna be here? Send us removal request.

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@codeopinion

Derek Comartin

1 year

Random reminder that I have a YouTube channel where I post videos about software architecture and design. Usually in the 10 min range trying be concise as possible. If you enjoy please share. Have suggestions? Please let me know.

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CodeOpinion is by Derek Comartin, a software developer with over two decades of professional software development experience. He's written software for a variety of business domains such as distrib...

www.youtube.com

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@codeopinion

Derek Comartin

1 year

Comment of the Day

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@codeopinion

Derek Comartin

4 years

This weekend I'm going to work on my next video about how Microservices (or any size service) have absolutely nothing to do with Container/Docker/K8s. I can't deal with reading these articles anymore. Next to nobody mentions it's about logical separation and not physical.

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@codeopinion

Derek Comartin

1 year

Developers can justify anything by saying it's "clean"

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@codeopinion

Derek Comartin

2 years

I'm creating a series of videos that will take an existing sample app and move a portion of it to be event sourced. Along the way, I'll be removing a bunch of layers and "services" which I think will give a better gist of Vertical Slices and how that plays with CQRS.

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@codeopinion

Derek Comartin

3 years

Almost every HTTP API that I've consumed implements errors differently. Can we just agree to use Problem Details and be done with it?

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@codeopinion

Derek Comartin

3 years

Blogged: When building Software as a Service (SaaS) you’ll often need to use a Multi-tenant Architecture. There are many different ways that you can segregate and share compute and data storage in a multi-tenant architecture.

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Multi-tenant Architecture for SaaS

Building SaaS you'll often need to use a Multi-tenant Architecture. Here are different ways that you can segregate compute and data storage.

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@codeopinion

Derek Comartin

3 years

I really don't understand having the defined role of "Software Architect". The architecture will evolve by the team. Someone on the team can be leading that charge. Everyone on the team can have varying degrees of input but ultimately it should involve everyone.

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@codeopinion

Derek Comartin

2 years

I love code. I love writing code. I love creating software. The challenging part in the software I write isn't writing the actual code. It's understanding the domain, really understanding. Then translating that to code, evolving the design and architecture over time.

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@codeopinion

Derek Comartin

3 years

I'm really curious about the software industry's love for making language/framework/tools the top priority of knowledge and experience. Why isn't the type/domain of software you develop the most important thing? Ex, hiring C# developer vs. hiring a developer for insurance.

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@codeopinion

Derek Comartin

2 years

Recently crossed the 50k subscribers mark. It's been a long road over the past few years. I try not to concern myself with the subscriber count, but it's hard not to notice. These videos aren't for everyone, but I appreciate everyone watching, liking, and commenting.

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@codeopinion

Derek Comartin

2 years

Friendly reminder that I have a YouTube channel that has over 100 videos about Software Architecture and Design. New content every week. If you enjoy my channel, please share!

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CodeOpinion is by Derek Comartin, a software developer with over two decades of professional software development experience. He's written software for a variety of business domains such as distrib...

www.youtube.com

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@codeopinion

Derek Comartin

3 years

Blogged: Everyone creating HTTP APIs seems to implement error responses differently. Wouldn't it be great if HTTP API Errors had a standard? Well there is! It's called Problem Details.

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Problem Details for Better REST HTTP API Errors

Do you wish there was a standard way to return errors from a REST HTTP API? There is, it's called Problem Details. Here's how to use it!

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@codeopinion

Derek Comartin

1 year

I finally read the Amazon AWS Lambda thing that was all the rage last week. Most of the takes I read were head-scratchers or just clickbait, I guess... It didn't help that the post stated it was moving from Microservices to a Monolith. From the post, they kept the logical

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@codeopinion

Derek Comartin

2 years

Curious how many folks developing "microservices" but share a database and integrate at the DB level? Just a free for all.

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@codeopinion

Derek Comartin

2 years

Some *interesting* replies. If you write CRUD-type systems primarily without "business logic" go talk to the people using it. The business logic is in their head. Watch their workflow and ask what they're actually doing and why. Guess what you'll discover, business logic.

@danielcranney

Daniel Cranney 🇬🇧

2 years

Confession: I don’t really know what business logic is.

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@codeopinion

Derek Comartin

11 months

FirstOrDefault kills me. Why would it possibly be null? And if it is null, you're then going to do what? Throw an exception. No thanks.

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Code Review & Refactoring to a Better Design

It's code review and design time! Here's some refactoring to remove the usage of null and throwing exceptions.

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@codeopinion

Derek Comartin

3 years

CRUD based apps leave workflows and processes up to the end user (in their head). Task based apps drive the user through workflow. Trying to shove business logic into CRUD driven "entity services" is recipe for a brittle system.

@Swizec

Swizec Teller

3 years

I wish more engineers thought of APIs as abstractions instead of pass-thru access to the database

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@codeopinion

Derek Comartin

2 years

Why is clean architecture so popular? I believe people want and use it as a prescription. Unfortunately, not all contexts have the exact needs for various levels of abstraction and stability. Context is King.

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Why is Clean Architecture so Popular?

Clean Architecture is popular because its used as a prescriptive way of organizing code, but should you use it as a prescription? Not really.

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@codeopinion

Derek Comartin

4 years

My continued .NET Core migration saga. We're running on 3.1 now in production. Anyone interested in a video of *my* entire saga (all aspects) of moving a large web app from .NET Framework to .NET Core 3? If so, any particular things you want answered?

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@codeopinion

Derek Comartin

10 months

@davidfowl It's absurd. Completely absurd. I could do a whole talk on the absurdity of it "in practice". I digress.

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@codeopinion

Derek Comartin

1 year

Curious if developers using C# forget there is a virtual keyword.

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@codeopinion

Derek Comartin

1 year

What’s the biggest scam in tech that is deemed acceptable? Best practices. Everything has trade-offs and your context matters. Let me give various examples to get out of this dogma about best practices.

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@codeopinion

Derek Comartin

4 years

Well, I was not expecting to migrate a small WinForms app to .NET Core 3.1 today. I did not read the docs at all. I simply did a dotnet new winforms in a new folder, copied over all my existing files to the new folder, added appropriate package references. Bingo Bango, it runs.

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@codeopinion

Derek Comartin

3 years

Can I mute all the one-sided conversations about Code Reviews, PR, and other nonsense? Can teams just figure out what works best for them that delivers the best working software and just do that. Can we start being pragmatic? Probably not but I still hold out hope.

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@codeopinion

Derek Comartin

5 years

7 y/o built this as his first real wood project. Cut, varnished, and assembled himself.

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@codeopinion

Derek Comartin

2 years

I just changed my IDE theme from dark mode to light. Am I a bad person?

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@codeopinion

Derek Comartin

6 years

Blogged: Is CQRS Complicated? CQRS is often referenced alongside other patterns that can make it seem difficult and complicated. Is CQRS complicated? No. CQRS is simple. Really simple.

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There are many misconceptions about CQRS. It's often mentioned alongside other patterns that make it seem complicated. CQRS is simple. Really simple.

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@codeopinion

Derek Comartin

1 year

Developer: I'm writing this hacky code that's a turd pile because I'm getting pressure to get this done. Oh well. Same developer on a different existing project: Look at this crappy code. Who is the brutal developer that wrote this hot mess? What were they thinking?

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@codeopinion

Derek Comartin

1 year

IApplicationDbContext that exposes a DbSet<T>. Amazing.

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@codeopinion

Derek Comartin

1 year

Genuinely curious how people who do content "full time" don't lose touch with the reality of the industry? Meaning that if you're not in the trenches of production systems. I'm coming at this from my own angle: everything I post is based on experience in production systems.

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@codeopinion

Derek Comartin

1 year

I'll keep yelling it. Logical boundaries aren't physical boundaries. When the industry finally acknowledges this, we can finally move on.

@jamesmh_dev

James Hickey 🇨🇦👨‍💻

1 year

2018: "How to split your monolith into microservices" 2023: "How to consolidate your microservices back into a monolith"

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@codeopinion

Derek Comartin

1 year

YouTube comments are enforcing the generalization that people using ORMs have no idea how SQL or databases work.

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@codeopinion

Derek Comartin

4 years

Blogged: If you’re developing an HTTP API how does that fit alongside a Task-Based UI and CQRS? How can you create a REST API with CQRS? For starters, resources don’t need to map to Entities. Second, HTTP Methods don’t need to map to CRUD.

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Is a REST API with CQRS Possible?

Is it possible to use REST API with CQRS? Of course! Resources can represent more than just Entities, they can be Commands and Queries.

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@codeopinion

Derek Comartin

3 years

Video: Want to see an example of how CQRS & Event Sourcing work together? Here's a code walk-through that illustrates CQRS, Event Sourcing, and Projections.

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CQRS & Event Sourcing Code Walk-Through

Want to see an example of how CQRS & Event Sourcing work together? Here's a code walk-through that illustrates sending commands to your domain that stores Ev...

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@codeopinion

Derek Comartin

2 years

Underrated skill (?): Critical Thinking. You'd think we as developers have this, but we seemingly lose all ability when something is "best practice", or it's "what we do" without thinking about our own context and if it serves us value.

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@codeopinion

Derek Comartin

2 years

Why is Clean Architecture so popular? I guess people are tired of working or creating turd piles that are poorly structured with mixed concerns. Ultimately it addresses coupling. But what about cohesion?

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Why is Clean Architecture so Popular?

Why is Clean Architecture so popular? You've probably noticed many videos and blogs that somewhat explain what Clean Architecture is and show you how to use ...

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@codeopinion

Derek Comartin

3 years

Slight adjustment: 99% of problems can be solved by a server-side rendered web app that queries an SQL database.

@CubicleApril

April King 🌀

3 years

99% of problems can be solved by a website with some JavaScript calling a Python REST API that queries an SQL database. Stop chasing the decisions of people with problems several orders of magnitude more complex than yours unless you understand why they did it.

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@codeopinion

Derek Comartin

2 years

Friendly reminder that I have a YouTube channel about Software Architecture and Design. Please share and spread the word if you find the videos helpful.

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CodeOpinion is by Derek Comartin, a software developer with over two decades of professional software development experience. He's written software for a variety of business domains such as distrib...

www.youtube.com

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@codeopinion

Derek Comartin

3 years

Event Sourcing is seemingly constantly being confused with Event Driven Architecture. In this blog/video I'm clarifying the difference. You will introduce a whole set a problems if you conflate the two.

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Event Sourcing vs Event Driven Architecture

Event Sourcing vs Event Driven Architecture. What's the difference? One is about state, the other is about communication.

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@codeopinion

Derek Comartin

2 years

Friendly reminder of my YouTube channel where I focus on Software Architecture and Design. Pretty good library now of videos with a new video every week! Please share if you find them helpful.

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CodeOpinion is by Derek Comartin, a software developer with over two decades of professional software development experience. He's written software for a variety of business domains such as distrib...

www.youtube.com

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@codeopinion

Derek Comartin

1 year

Did you know you can write an HTML file. Yes, a file you end with a .html extension. Amazingly, you can create html without JavaScript. Crazy, I know!

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@codeopinion

Derek Comartin

2 years

Just noticed that my YouTube channel passed 40k subscribers 🎉. For those that watch and subscribed, thank you! I'll continue to post my nonsense opinions 😂

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@codeopinion

Derek Comartin

2 years

I don't create abstraction "in case the underlying implementation needs to change". I create them to simplify the API surface. If I don't need to do that, don't create more indirection. Abstraction or no abstraction, limit coupling and "in case it changes" becomes less relevant.

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@codeopinion

Derek Comartin

1 year

Almost every video I watched about domain modeling started with creating data models and calling them entities. Very few of them talk about the actual domain concepts about how that data comes to be. As a whole, little has changed regarding modeling a domain in the past 20+

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@codeopinion

Derek Comartin

4 years

I'm not sure why exactly, but I have almost zero interest in Blazor. And this coming from someone that thinks frontend JS ecosystem is a tire fire. You'd think I'd be excited about this yet... meh.

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@codeopinion

Derek Comartin

1 year

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@codeopinion

Derek Comartin

2 years

Microservices vs monolith seems to be a thing I keep seeing more of. Once the larger dev community can figure out that logical boundaries aren't physical boundaries we'll be over this nonsense.

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@codeopinion

Derek Comartin

2 years

False alarm; I switched back to dark mode. Experiment over.

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@codeopinion

Derek Comartin

2 years

I'm somewhat convinced of you start with a task driven UI, you'll also end up with an event driven architecture.

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@codeopinion

Derek Comartin

3 years

Synchronous request/response is tight coupling. It doesn't matter if it's in-process or RPC. Tossing HTTP calls between services doesn't make anything less coupled.

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@codeopinion

Derek Comartin

2 years

Friendly reminder: I have a YouTube Channel and a lovely blog where I post about software architecture and design. If you enjoy it, please share!

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CodeOpinion is by Derek Comartin, a software developer with over two decades of professional software development experience. He's written software for a variety of business domains such as distrib...

www.youtube.com

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@codeopinion

Derek Comartin

1 year

I knew this was the case that these videos are not for everyone, but it was interesting to get this comment.

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@codeopinion

Derek Comartin

5 years

Unpopular opinion: what most of us do is not engineering and the term software engineer is absurd.

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@codeopinion

Derek Comartin

2 years

I'd argue more complexity has been created by people trying not to repeat themselves. I also don't call that technical debt.

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@codeopinion

Derek Comartin

2 years

I learn and use new C# features via Rider.

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@codeopinion

Derek Comartin

3 years

The most impressive developers in my experience are the ones that can transparently jump between code and talking with business folks.

@davidfowl

David Fowler

3 years

The most impressive engineers in my experience are ones that can transparently jump between the layers of the stack. Up to the UI and down to the assembly (ok maybe not that low...)

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Derek Comartin

2 years

I'm on a mission to create a video illustrating how useless an object model (aggregate) is with a bunch of SetPropertyThingy(value) methods. Serves absolutely no purpose. The template of WebAPI > AppLayer > Repository > Data Model with useless setters needs to die in a tire fire

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@codeopinion

Derek Comartin

1 year

Comment of the Day.

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Derek Comartin

2 years

McDonald's uses an event-driven architecture! I love it when companies have technical blog posts. I gave some of my thoughts and did a breakdown of what they posted.

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McDonald’s Journey to Event-Driven Architecture

McDonald's uses an Event Driven Architecture! Luckily for us they've written a couple of blog posts providing some details of their journey into event-driven...

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@codeopinion

Derek Comartin

1 year

Fairly sure when you say "unit" tests, what most developers (in OO) really think are "class" tests. If more than one class involved they then equate that to integration.

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@codeopinion

Derek Comartin

2 years

You often think of messages as fire and forget. Send a command to a queue, and the consumer handles it asynchronously. You don't know when the message was processed or the result. However, there is a solution!

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@codeopinion

Derek Comartin

2 years

Good to know people using JS aren't doing any domain modeling and bullshit.

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@codeopinion

Derek Comartin

3 years

I've noticed that "Software Developer" YouTube is much like "Fitness" YouTube. There's a ton of bad information and the overwhelming majority of it is targeted at beginners.

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@codeopinion

Derek Comartin

1 year

Separation of concerns, principles, yadda yadda, yet I see over and over a data model also being used as a domain model. What's more amusing is "persistence ignorance" as a driver and it's absolutely affecting your design. Even if you didn't want to use event sourcing, I think if

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@codeopinion

Derek Comartin

3 years

Value Objects don't need an IValueObject or a ValueObject abstract base class. I'm looking at you almost every example.

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@codeopinion

Derek Comartin

2 years

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@codeopinion

Derek Comartin

4 years

Inconsistent and poorly formatted code bothers me. Bad indentation, missing whitespace, casing, braces... It really bothers me. There, I said it.

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@codeopinion

Derek Comartin

2 years

You can think I'm an idiot, and my opinion is nonsense. I'm giving my opinion based on my experience. You don't have to agree with it.

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@codeopinion

Derek Comartin

2 years

After 20+ years, I'd suspect my code is closer to the earlier years than around the ~10 year mark. Earlier years were simpler but naive. Middle years were "flow a crap ton of patterns because reasons". I hope that blog/videos can help others with that middle part to be pragmatic.

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@codeopinion

Derek Comartin

2 years

Comparing Kafka and RabbitMQ is like comparing a distributed Log and a Queue. Wat? Exactly, they're different things.

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@codeopinion

Derek Comartin

1 year

“Clean Architecture” and indirection. No thanks. I reviewed a video that was trying to apply the query side of CQRS by adding a whole lot of useless indirection. Please don't do this.

"Clean Architecture" and indirection. No thanks.

I reviewed a video illustrating Clean Architecture and the query side of CQRS. All I kept thinking was, "this is useless indirection".

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Derek Comartin

2 years

You don't need an interface for everything! You can design and use different abstractions where appropriate. Not everything needs an interface and mocking to be deterministic.

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Testing WITHOUT Mocks or Interfaces!

You don't need an interface for everything! There are other abstractions and designs that allow you to test without mocks or interfaces.

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Derek Comartin

2 years

Based on YouTube comments, I get the feeling there are many people with "Sr. Developer" titles that should be "Sr. Hot Mess Maker." Reading some of these comments makes me feel bad for Jr. devs trying to sort through it and likely being shot down for suggesting it's too complex.

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Derek Comartin

4 years

Can we get a C# build task that rips out tests from an assembly for release builds. I'm really tired of separate projects.

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@codeopinion

Derek Comartin

2 years

I'll never convince some folks that useless abstractions and indirection add no value (net negative). Just because you're not abstracting dependencies does not mean you're going to be stuck with them and have technical debt. Define boundaries (cohesion). Control coupling. Period.

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@codeopinion

Derek Comartin

1 year

One of the building blocks of messaging is, you guessed it, messages! But there are different kinds of messages: Commands and Events. So what's the difference? They have distinct purposes, usage, naming, ownership, and more!

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Derek Comartin

2 years

Generally, I find anything that's implicit to be a trap. I'd rather things be more explicit even of it's more verbose.

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@codeopinion

Derek Comartin

2 years

Are you using .NET and want to use Event Sourcing for persisting state? @jeremydmiller and the @marten_lib to the rescue!

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Event Sourcing in 1 Hour with Marten in .NET

Are you using .NET and want to get into event sourcing for persisting state? Well, I have a presentation by Jeremy Miller, a maintainer of Marten. Marten is ...

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@codeopinion

Derek Comartin

1 year

Does anyone know of a Roslyn analyzer to help me in this situation?

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@codeopinion

Derek Comartin

4 years

"I'm a software developer who got promoted to management". To some, that's not called a promotion.

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@codeopinion

Derek Comartin

1 year

Anything new in the .NET space? Seems kinda quiet. 😂

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@codeopinion

Derek Comartin

2 years

Consistency is critical when working with an event-driven architecture. You must ensure that when you make state changes to your database, the relevant events you want to publish are published. You can’t fail to publish events.

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Don't Fail Publishing Events!

Consistency is critical in event-driven architecture. Saving state and publishing events must be consistent. Don't fail publishing events!

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Derek Comartin

4 years

This is my full experience report and journey to migrating a large (+250k LOC) project from .NET Framework to .NET Core.

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Migration Journey of a Large App to .NET Core

Here's my full experience report of migrating a large (250k+ LOC) app from .NET Framework to .NET Core. This has taken over 3 years to fully migrate and thi...

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@codeopinion

Derek Comartin

2 years

Sometimes I just need to reply, especially after a long day of traveling.

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Derek Comartin

2 years

SOLID Principles, Clean Architecture. Meh. I rarely think of them but rather just coupling and cohesion from higher to lower levels.

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@codeopinion

Derek Comartin

3 years

Just passed 14k subscribers on my YouTube channel. Goal at the beginning of the year was 15k. Although total subs means nothing, I do think I've got a pretty engaged community happening. I appreciate all the comments, views, and likes.

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Derek Comartin

1 year

Can someone explain why many developers won't pay for crap? "That library is great but it's got extension features that are paid and I'm not buying it". Are they afraid to ask their manager/procurement? I get people working in all kinds of orgs that make it difficult, but it's

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Derek Comartin

4 years

Holy crap. I passed 8k subscribers on my YouTube channel and I have no idea when. Onwards and upwards!

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@codeopinion

Derek Comartin

3 years

After reading some puzzling comments on Reddit, I'm creating a video on DDD. Stop caring so much about the structural/pattern nonsense and start caring about the domain, modeling, language, and boundaries.

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Derek Comartin

3 years

@ardalis @TheCodeJunkie I was once given the advice to ask someone the downsides/pain/problems/tradeoffs of something they say they know deeply. It's a pretty good indicator of how deep their knowledge really runs. Doing so I've concluded a lot of folks' opinions are just the opinions of others.

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Derek Comartin

2 years

You'd be surprised how far you can scale a monolith. There are a lot of options you have before you start to decompose into separate physical boundaries.

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Scaling a Monolith with 5 Different Patterns

Want strategies for scaling monolithic applications? If you have a monolith that you need to scale, you have many options. If you're thinking of moving micro...

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@codeopinion

Derek Comartin

1 year

I've found there's a common path developer take once they get over only thinking about database schemas. Commands, Task based UIs, and Events.

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Path to Event-Driven Architecture. Start capturing INTENT!

CRUD (Create Read Update Delete) needs to burn in a tire fire.While it seems simple, it often leads to a spaghetti code mess of complexity in a large system....

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@codeopinion

Derek Comartin

2 years

Coupling and Cohesion go hand in hand. Yet, cohesion is often left out of the conversation, and we focus on coupling. Then we organize our code based on coupling of technical concerns. Add cohesion to the forefront and start organizing code around it.

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Vertical Slice Architecture, not Layers!

Why Vertical Slice Architecture? Nobody wants to deal with a system that is hard to change and easy to introduce bugs because it's a spaghetti code mess of v...

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@codeopinion

Derek Comartin

10 months

Domain-Driven Design sample/reference applications do more harm than good. In a vacuum, they’re a net negative. It isn’t easy to convey the complexity and trade-offs made using trivial code examples. They're the wrong starting point.

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DDD is just giving a $h!t about your Domain

Want to start with Domain-Driven Design (DDD)? Don't start with sample apps or looking at code. It's the wrong place to start.

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Derek Comartin

1 year

I'm convinced sample/reference applications do more harm than good for beginners. As in, they are overall a net negative. It isn't easy to illustrate why something is done when you're fabricating the context and scope of the problem.

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Derek Comartin

2 years

This is my problem with CDC in the form of "EDA". I struggled to express it, but thankfully @ylorph pointed it out. It's no different than this.

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Derek Comartin

2 years

So dotnet 7 is out and I have no clue what's new. Blazor likely something or other.

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Derek Comartin

1 year

IEverythingIsAService 🤡💩

@sfeldman

Sean Feldman

1 year

I still can't understand why .NET developers insist on having an interface for every single class.

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Derek Comartin

3 years

I'd be happier with exhaustive pattern matching and an option type rather than nullable reference types in C#. Be done with all this nullable nonsense and move forward.

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