Refactoring C# with Chain of Responsibility

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What is the Chain of Responsibility Design Pattern, and how can I apply it in C#.
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Опубликовано:

6 мар 2023

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Комментарии : 48

@OrgesKreka Год назад

Please do another video on design patterns!

@gui.ferreira Год назад

Any Design Pattern, in particular, you would like to see?

@kostasgkoutis8534 Год назад

I would like to see a video on Pipes and Filters pattern and on State Machines. Together with the Chain of Responsibility, Mediator, and Rule Engine patterns, they form (for me) a logical "pipeline patterns" group (maybe with the Monad pattern as well).

@gui.ferreira Год назад

That's a big list 😁 Thanks for sharing

@starterdev Год назад

Show us all the design patterns 🥰

@gui.ferreira Год назад

There's a new one comming soon. 😉

@nucasspro1 Год назад

Thank you so much, after watching this video, now I realize asp net core pipeline is following this pattern

@gui.ferreira Год назад

Excellent and accurate observation! I'm happy you find this video useful.

@ahmet9424 Год назад

Great sample app 👍 Thank you.

@gui.ferreira Год назад

Glad you like it! Thanks!

@moab5102 Год назад

Thank you that's an excellent video I would like a tutorial about rule engine or specification design pattern keep up the good work

@gui.ferreira Год назад

Thanks for the suggestion. Added to the content idea list 😉

@sunnypatel1045 Год назад

I be keep to see your experience with observer and visitor design patterns

@gui.ferreira Год назад

I'm likely doing one on Visitor soon.

@gui.ferreira Год назад

Here it is the video on the Visitor Design Pattern ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yyKrt7zSmv0.html

@alexandrgoncharov5074 Год назад

thank you for the video. great explanation

@gui.ferreira Год назад

Glad you liked it 🙏 Thanks for taking the time to write feedback.

@FreeMindInMotion Год назад

Great explanation. Visitor pattern would be interesting

@gui.ferreira Год назад

Noted 😉 Anything, in particular, you would like to see on the Visitor Pattern?

@FreeMindInMotion Год назад

For me the visitor use case is difficult to identify. That's why I chose it 😀 Maybe you have a good example pointing out the double polymorphic dispatch.

@FreeMindInMotion Год назад

Taking your example with the order I think it could be used, if you have IOrder, PriorityOrder and NormalOrder. Both need to be handled by the different Handlers, but differently by each or at least some handlers based on their concrete type without type checking.

@gui.ferreira Год назад

@@FreeMindInMotion Let me think about it 😁

@gui.ferreira Год назад

Here it is the video on the Visitor Design Pattern ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yyKrt7zSmv0.html

@patbeansoo Год назад

Good stuff. Subscribed :)

@gui.ferreira Год назад

Thanks, Vince! Welcome aboard!

@saqibali7066 Год назад

Good example, Please do explain strategy design pattarn.

@gui.ferreira Год назад

Added to the pipeline! Anything, in particular, you would like to see on Strategy Pattern?

@saqibali7066 Год назад

@@gui.ferreira how the flow goes ? Is loading web project configuration dynamically is good example mean either I can read configuration from web.config or from dynamoDB

@gui.ferreira Год назад

@@saqibali7066 I published it weeks ago: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_kV7lPOLISw.html

@saqibali7066 Год назад

@@gui.ferreirathanks

@ghevisartor6242 8 месяцев назад

I wonder if this is correct to use in a case where i don't have a commonality like a "discount approval" but regardless i need to check a bunch of conditions, for example for deleting a file. Basically to get those conditions, in one i have to check the database, in another just some of the file properties. By separating these into their own handler, now i have the DbContext for example just in the first handler and not the other. So i end up with "IsFileInUseHandler", "IsFileOlderThanHandler" and then lastly "DeleteFileHandler" where i do File.Delete(filePath). It seems to work fine and simplify the code, but as you can see from the naming it sounds odd, also the last handler is actually having side effects. Am i trying to force a square in a circle?

@gui.ferreira 8 месяцев назад

You are building a pipeline, which is a common practice here. As an example, I've seen many implementations similar to the one you mention in MediatR pipelines (which is a Chain of Responsibility).

@LucasSantos-yw4nh Год назад

Do you see any performance downgrade between Chain Of resposibility and Strategy Pattern? Also, is there any technique to find the the best order to fit the handlers in the chain?

@gui.ferreira Год назад

To be honest, they solve different problems, so it's not fair to compare them. Regarding the order, it depends on the problem they are solving. In the example from the video, order matters. But, in some cases, the Order can be ignored. For example, if you want to apply Authorization restrictions, you may want to start with the least resource-intensive ones. Long story short, it depends on the domain and business context. Did my answer help? 😅

@LucasSantos-yw4nh Год назад

@@gui.ferreira Yeah, it helped, thanks. But I still think both design patterns solve the open closed principle in order to create new behaviors without the need to change the class. I would like to know more about your point that it solves different problems.

@gui.ferreira Год назад

@@LucasSantos-yw4nh When I say that they solve different problems it's because Strategy is about having a generic interface that you can use to provide different implementations. On the other hand, a Chain of responsibility is about having a chain of objects which usually go from more detailed to more generic. So, you may solve the same problem with both, but not all the problems.

@xmadcode Год назад

The Chain Of Responsibility and the Pipeline Patterns would make a fair comparison, not as with the Strategy Pattern, in my opinion

@vagnerwentz1189 Год назад

What is this IDE? JetBrains?

@gui.ferreira Год назад

JetBrains Rider 🤘

@xmadcode Год назад

The strategy pattern

@gui.ferreira Год назад

Added to the list! 😉 Anything you would like to see on Strategy Pattern?

@xmadcode Год назад

@@gui.ferreira an overview of the pattern with a simple real life implementation in C#, and how can someone spot a use case for the pattern, would a make a great video ;)

@gui.ferreira Год назад

@@xmadcode Thanks for the Tip. I will think about it!

@SimonLomax-qw3dv Год назад

What colour theme are you using?

@gui.ferreira Год назад

Hi! Dracula for Rider plugins.jetbrains.com/plugin/12275-dracula-theme

@SteveNgaiCheeWeng Год назад

can we also refactor it with DDD?

@gui.ferreira Год назад

Not sure what you are thinking about. For sure, the service/application can be modeled using DDD. However, Design Patterns like the Chain of Responsibility are useful even with DDD. Can you detail your question?