A Step-by-Step Guide for the Cache-Aside Pattern + Stampede Protection

[@MilanJovanovicTech]

Want to master Clean Architecture? Go here: bit.ly/3PupkOJ Want to unlock Modular Monoliths? Go here: bit.ly/3SXlzSt

[@Ebrahem-outlook]

Thank you, Milon, you are a light on my way. I found you when I was searching for what is the Repository pattern. Now I can build powerful and scalable distributed systems, and I understand well almost everything about DDD, modular monolithic and microservices. I got to know many libraries thanks to you and learned from a lot... I am in the first year of the College of Computer and Electronics Engineering and I did not dream of learning about all this now... I hope we meet one day. Thank you for everything.

[@MilanJovanovicTech]

You are crushing it my man 💪 Keep up the good work!

[@InshuMussu]

Whenever I watch your videos, I feel how poorly i write code. Thank you for all the unique and very, very practical, and useful videos.

[@MilanJovanovicTech]

You're most welcome! :)

[@shamjithharidasan]

Thank you Milan. Your tutorials are excellent

[@MilanJovanovicTech]

Glad you think so!

[@andersjuul8310]

Thank you! As always -- great presentation, great coding style and well worth a watch even if there was little new knowledgewise. I look forward to the .Net 9 Caching video!

[@MilanJovanovicTech]

Much appreciated!

[@TellaTrix]

Thank you for sharing this on you channel. lot of new learning on you channel.

[@MilanJovanovicTech]

You are so welcome

[@10Totti]

Great tutorial thanks!

[@MilanJovanovicTech]

You're welcome!

[@jonny.rubber]

Maybe it's worth to mention that the key is important in multi-user/tenant applications which have different security concerns per user. A "NormalUser" could have different rights as an "Administrator" for example, where a "NormalUser" would be restricted in the list of entities he/her could see. When using a multi-tenant environment, an "Organization"-part should also be added to the key (or maybe a completely separate Redis Instance). When the key doesn't take anything of that into consideration, users could get strange/forbidden results. I'm just starting to implement caching now, so am I right here, any tips?

[@MilanJovanovicTech]

Yes, caching and authorization (who can do/see what) is tricky. The implementation you suggested is something I've done in the past in similar situations.

[@GameSteals]

What if the data being cached gets updated within the 2 mins window? Since we are not updating the cache on write wouldn't we get a stale value from the cache? While I understand that we shouldn't be caching all writes but can't we do this? When writing to DB, check if the value is present in the cache. If it is present, update the value in cache, otherwise do nothing.

[@MilanJovanovicTech]

Invalidate the cache and update (write through). Or just invalidate the cache and let it be cached again on next request.

[@GameSteals]

@@MilanJovanovicTech Thank you! That makes sense.

[@codewithkashif]

Excellent content and very well-written code! I have a quick question about the parameter named 'factory'. What was the reasoning behind choosing this name, and are there any other potential alternatives?

[@MilanJovanovicTech]

It's a factory that creates the resource if it's not in the cache, is all

[@InshuMussu]

Hi, can I ask something, why don't use in memory cache with redis, we should check in memory first if not found then goto redis, in that way we can save network call. I don't know, may be I am missing something because I have never seen this approach. Could you please advise?

[@MilanJovanovicTech]

HybridCache will take care of this

[@InshuMussu]

@MilanJovanovicTech yes thank you, since HyridCache is introduced in .net 9, before .net 9 it should be using by manually combining both inmemory and redis for the low latency, this approch seems very powerful to me but it's not commonly discussed in internet don't know if there is drawback..

[@compman73]

It was awesome Thanks for sharing 👍

[@MilanJovanovicTech]

Glad you liked it

[@ChristopherBriddock]

Hey Milan, can you do a video about EF Core and Temporal tables?

[@MilanJovanovicTech]

At some point, yeah

[@phw1009]

Which project should I put `CacheAside` class in Clean-Architecture?

[@MilanJovanovicTech]

Where do we place external concerns?

[@phw1009]

@@MilanJovanovicTech Oh, I guess Infrastructure...? Then, should I put it inside Persistence project?

[@MilanJovanovicTech]

@@phw1009 I would usually place it inside Infrastructure

[@neranjansugumar683]

hey Milan, can you please let us know the theme you're using?

[@MilanJovanovicTech]

It's ReSharper

[@vamvdotnet]

Hello Milan! Excellent video! Very useful information! Congrats! By the way, do you happen to have a video that deep dives into Distributed Locking (what it is, real-world scenarios, how to implement in Redis or another cache technology)? It would be really great! See ya!

[@MilanJovanovicTech]

Sadly, I don't have anything touching distributed locking (so far). But I've been meaning to make some content around that 😅 While you wait, you can checkout Redlock: github.com/samcook/RedLock.net

[@vamvdotnet]

@@MilanJovanovicTech No problem, my lad :) You just did help a whole bunch by giving me this pointer! Thank you once again :)

[@DesaiBharat702]

How to use factory pattern for large property?

[@MilanJovanovicTech]

What do you mean by larger property?

[@DesaiBharat702]

If a class have more than property around 20 so in entity we mark property as private and create a factory method it difficult to set all twenty property using factory

[@Locustfiretree]

@@DesaiBharat702 Builder pattern is one option, or you could consider the class is doing too much if there are too many properties.

[@andersjuul8310]

Would you cache the dto or the entity?

[@MilanJovanovicTech]

Preferably DTO

[@malcolmlaraposada5300]

nice content

[@MilanJovanovicTech]

Thanks!

[@comroec]

I need a sample Blazer project with a report generate. pls

[@MilanJovanovicTech]

Won't find it in this video

[@andersjuul8310]

😂​@@MilanJovanovicTech

[@JoaoSilva-rz4js]

You missed a return if your data was fetched from cache

[@MilanJovanovicTech]

Where?

[@JoaoSilva-rz4js]

When first applying the cache on the minimal API. It works on the example because you press continue. Yourre just calling results.ok not actually returning

[@JoaoSilva-rz4js]

Minute 7:57

[@MilanJovanovicTech]

@@JoaoSilva-rz4js Oh lol, you're right. Typo.