Use Null Object Pattern in Your Rich Domain Model
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- čas přidán 25. 05. 2023
- The source code from this demo is available on Patreon: / use-null-object-83554737
Ever wondered about the impact of the Null Object design pattern on domain modeling? This video offers a deep dive into this fascinating topic, demonstrating how identifying objects that behave like 'zero' can create a more intuitive and friendly model, even in a complex business domain.
We bring this concept to life through a real-world example, demonstrating the significant influence of 'null objects' in a deep domain model when it comes to implementing essential features. Watch this video to experience this simplifying effect firsthand!
And not just that, we also reveal situations where you might want to avoid using the Null Object pattern by adding a touch of complexity to your classes, but gaining more from their simple and intuitive public interface. Discover why maintaining a simple public interface could be advantageous over polymorphic Null Object implementation.
By the end of this journey, you'll be equipped with the know-how to apply these concepts creatively in your domain modeling, ultimately leading to more structured code.
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Hi, I’m Zoran, I have more than 20 years of experience as a software developer, architect, team lead, and more. I have been programming in C# since its inception in the early 2000s. Since 2017 I have started publishing professional video courses at Pluralsight and Udemy and by this point, there are over 100 hours of the highest-quality videos you can watch on those platforms. On my CZcams channel, you can find shorter video forms focused on clarifying practical issues in coding, design, and architecture of .NET applications.❤️
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#dotnet #csharp #designpatterns - Věda a technologie
Excellent presentation. Well balanced. None of the "Your doing X wrong!!" hysterics here.
The greatest secret of software design is that every decision is a tradeof.
I rarely watch videos twice. This one opened my eyes. I think your videos are reminding us how we should look at the code.
Thank you for your comment. I am glad to hear the video was helpful.
Essentially creating an algebra by adding an Identity element under the Add binary operator.
Great presentation from one of my favorite instructors! Making my development team watch it.
Haven’t programmed in C# for a couple of years now, still loving the examples. Good job !
Thank you for not using the default 'Order, product and Order Items' examples. 😊
Of course :)
Thank you again Zoran. Brilliant video!
omg, a list of my favorite books.
Thank you for the impressive video, as always.
Another excellent video sir!
"poor man's polymorphism"
Oh yes, you can find it everywhere.
That makes you wonder which one is rich man polymorphism
@@josebarria3233 Just polymorphism.
"There are obviously two kinds of money - Zero and Non-Zero"
Me: "Wait... You guys have non-zero money?"
IMO there's a flaw in your current implementation, as it is possible create a Money object with Currency.Empty and a non-zero amount.
So it is possible to handle money without a currency.
A possible solution is to throw an exception in the constructor if currency equals Currency.Empty.
Also I would rename Currency.Empty to Currency.None, as there's no such thing as an "empty" currency.
Good observations.
8:30 "Money has just become abstract"
... not just...
Ming the Merciless retired as a coder?
I'm loving your videos! Do you have plans to make content about async programming and synchronization?
I have one video in the queue that talks about asynchronous programming, which I might record in the near future.
@@zoran-horvat glad to hear it, thank you!
Great ideas and insights. Not a big fan of throwing exceptions in this case, thought.
There is a more complex design where Money separates "strict" addition from that with mixed currencies. However, subtraction can never be with mixed currencies, except for subtracting a zero...
For a 100% safe and sound solution, we would need to return an Either monad from all strict methods. But with no syntactic support for errors in C#, the implementation and its use would become significantly more complex and less readable.