5. Factory Pattern Vs Abstract Factory Pattern Explanation, Low Level System Design interview

Hi, in this video we have covered #factoryPattern and #abstractFactoryPattern design patter out of many design pattern which is asked in Low level system design interview.
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[@kaustavgalacticos]

And regarding abstract factory, although, you haven't coded it here, I just thought it is worth mentioning for the wider audience on the real use-case of that pattern. The example you showed is not the ideal use-case of the abstract factory. Luxury or ordinary, a car is still a car, so it should still be a factory. But, the most appropriate pattern for it is decorator, which prevents class explosion of different types of cars. Now coming to the real use-case of abstract factory. It has a very niche use-case, like some other behavioural patterns (e.g. flyweight). That use-case is creation of products in factory in a package. Imagine a racing game with different backgrounds, different landscapes, etc. you still need to create different unrelated objects, in same quantity, but with minor changes in the characteristics. That's where you use the abstract factory. For instance, one abstract factory will produce all the objects required in the game if it is played in rainy mountainous terrain, another abstract factory will create the same objects but in sunny desert terrain. The point is, when you create an object of sunny desert terrain, all the other objects of the game have to be created in sunny desert terrain, not rainy mountainous terrain. that's where the abstract factory really comes to the fore. so it is a bundled creation of objects based on criteria that drives whether you should use abstract factory or not.

[@HA-ky5vd]

jyada gyat mat do

[@ankitgoyal8556]

Thanks dude.

[@ritikchhillar4963]

good example

[@umangmalhotra1222]

I am following your videos in LLD and HLD religiously. For not only any interview preparation, but to become a good engineer. Upade - finished this today.

[@ConceptandCoding]

Glad to know that buddy 👍

[@srinivasa6981]

These patterns were in my To-Do List since long. May be more than 2 years. But finally I was able to understand and completed the tasks successfully within two days. I really enjoyed the video. Looking forward for more videos like this. Thank you for your great efforts.

[@ConceptandCoding]

Thanks a lot. Kindly check the playlist, you will find many content like this :)

[@anant1995rawat1995]

Studied the design pattern for the first time, but after studying it from your channel it felt like I have known these concepts for a long time. Amazing work bro...

[@ConceptandCoding]

Thanks 👍

[@SugamMaheshwari]

Great explanation of factory and abstract factory design pattern!

[@rohitkumar-gt9wp]

Great work 👍

[@amansharma2466]

Great work!

[@sameerchoudhary8590]

Even in my company's codebase, factory pattern is used a lot. Nicely explained.

[@AtharvaRao0104]

what you have described is a "SimpleFactory" . The creational pattern "factory method" pattern. Most get confused between the 2. in factory method pattern, In your super class you describe the work to be done using an abstraction. (coding to an interface) But someone has to create the real object. This creation is delegated to the sub class. The advantage is conformance to OCP. You create a new class which just creates the derived object which implements the abstraction.

[@naruto5437]

bhai bahot badhiya samjhaya....

[@trilochan6475]

Appreciate your explanation.. thank you very much. Very helpful for redesigning the existing module too.

[@ConceptandCoding]

Thanks

[@suchitrasrinivas4330]

Very Nicely explained both factory and abstract factory patterns. Thanks a lot!

[@ConceptandCoding]

Most welcome!

[@SatyamKumar-bw4vi]

Hare Krishna..! Great Video🙂

[@sachindwivedi546]

Great video, because no one can explain in hindi in a simple way because in english there are tons of videos, but kuch samaj nahi aata unka and many indian FAANG are just making videos in english. pta nahi kya promote kr rahe hai. but acha hai LEARNING VIDEO should always be in hindi tabhi samajh aata hai bhale hi problem kitni bdi kyu na ho.

[@theritesh973]

Awesome explanation!!! Thank you!

[@ConceptandCoding]

thanks

[@ayushijain2911]

Hello Shrayansh, Thanks for quality content. I am learning from your tutorials and also found this playlist one of the best. Recommending to my friends as well. Thanks

[@ConceptandCoding]

thanks a lot Ayushi. Thanks for recommending, It means a lot to me.

[@subhajitkarmakar22]

Nice video. Also please keep on adding more live coding examples along with concepts.

[@rahulsharma15]

Easy to grab explanation 🙂 Please build the full playlist of design patterns. You are doing a great work Thanks buddy

[@ConceptandCoding]

thanks Rahul, pls do check my LLD playlist, i have covered many design pattern in it.

[@AmanSharma-vb5jl]

Good one

[@ayushpanigrahi2041]

the explanation with the code is just on point please keep making such videos 😀

[@ConceptandCoding]

thank you

[@obsessiveDreamer]

Nice Explanation❣❣

[@vinayakgandhi5690]

No words. Hats off.

[@ConceptandCoding]

thank you

[@VanguardHere]

Amazing sir, Very crisp info in such a short time

[@ConceptandCoding]

thank you

[@Mohit_Gupta24]

The first pattern is not Factory pattern. It is Simple Factory, which is more of a good programming practice. Also, In the class diagram, Shape "has a" Shape Factory to delegate responsibility of object creation to factory, but it is missing in the code implementation part. Also, please include Factory Method pattern.

[@shubhamaptekar7748]

than you so much sir great job understanding easily

[@ConceptandCoding]

Thank you

[@tanishajindal5660]

Great work. Best resource for covering all hld and lld topics in a structured way.

[@ConceptandCoding]

Thanks

[@amitthakur2799]

Excellent Explanation!!, Thanks

[@ConceptandCoding]

thank you

[@rishabhvarshney7811]

I really liked and impressed by your explanation in all the videos, very good content. did not understand why your channel has very less subscriber.

[@ConceptandCoding]

Really glad to know that you liked the content. 🙂 youtube reach is less, but I am trying to promote through my LinkedIn as much as I can.

[@veereshb3249]

firstly thanks for doing this, really great stuff... secondly your examples help a lot.. can you please try giving more examples Sir.. I really wanted more abstract factory pattern examples.. helps in remembering

[@ConceptandCoding]

Sure

[@shaileshgande3875]

One small correction: ShapeFactory interface doesn't have a "has-a" relationship with Shape interface. It doesn't hold a Shape object, instead, one of it's method creates and returns a shape object to the client based on some logic. Please correct me if I'm missing anything.

[@rohan8758]

right shailesh, I am also reasoning the same.

[@umangkumar2005]

best way of explaining

[@ConceptandCoding]

thanks

[@RAHULKUMAR-co7ye]

Great Work It help us a lot please make more videos that help us to understand company standard

[@ConceptandCoding]

Thanks, Pls do check the complete LLD and HLD playlist

[@ajayjangid1164]

💡💡The name is “Abstract factory” coz the sub-factory-class is got abstracted in main-factory-class.

[@kanupriya3926]

Great explanation sir thank you so much.....i have a question can i took example of db connections here

[@ravikanhreddymanik7767]

Excellent brother!!!

[@ConceptandCoding]

Thank you

[@shriharikulkarni3986]

Awesome explanation

[@ConceptandCoding]

Glad you liked it

[@akshaymahajan9626]

Very Well explained !

[@ConceptandCoding]

thanks

[@jaymanik]

Great Explaination. Keep up the awesome work.

[@ConceptandCoding]

Thanks

[@jaymanik]

@@ConceptandCoding Which should i learn first LLD or HLD? I am 8 years experienced software developer preparing for interviews.

[@ConceptandCoding]

@@jaymanik both need to be learn parallerly buddy, as both are imp for this much of experience and both are independent of each other

[@jaymanik]

@@ConceptandCoding Thank you for super quick reply. I intend to watch all videos in both your playlists. Thanks again.

[@sravanakirtana2787]

Superb explanation not taking unnecessary extra time. Awesome thank you Sir

[@akshay_g]

Nice videos

[@shantanuverma331]

Hi I have started this playlist today, will edit this comment after completing, hope I am motivated to do so

[@ConceptandCoding]

:) sure

[@kaustavgalacticos]

Good content. Although, I just wanted to point out something so that other viewers are also aware of the nuance. This is a factory pattern, which is not really a design pattern, technically speaking. The actual pattern is factory method pattern, where the same over-ridden method will create different products.

[@vishaldas5692]

do you have any video of it

[@chandrikasaha6301]

Too good

[@ConceptandCoding]

Thanks

[@eshaandevgan312]

Help me understand it right. If we have a new Factory coming up as an economical luxury, is such a case, I would change the lower classes, right? For example, Hyundai should move from ordinary to econ. luxury. But that would be violating the SOLID principle classes not open to change. Any recommendation? Is there a way for concrete classes to select which factory they should belong to?

[@ADITYAKUMARking]

Great Explanation. Thanks for video. One Question, though: In many codebases i saw that developers use HashMap() instead of switch cases in factory function/method. Is this good practice or bad practice? Can you clarify ?

[@ShekharSingh-qr3qu]

They are using that to remove switch or if conditions. From a collection they can manage. In dependency injections framework like ninject same way they are implementing i thought 🤔

[@ShekharSingh-qr3qu]

Hi Shrayansh, You are doing a great job and the number of people like me get to learn the concepts in an easy way. However, in this video the factory pattern you explained is not the one from the gang of four factory patterns.please correct me if I mistaken.

[@deepanshukumar3943]

I had the same question but I didn't ask.

[@hemakiran5968]

Correct me if Im wrong, the "Has-A" relation-ship symbol should be in reverse right? Ex: ShapeFactory

[@bodybuildingtheory5337]

It would be great if you can share the notes in description.

[@sauravlikhar]

Nice video

[@ConceptandCoding]

Thanks

[@harshinredzone]

Shrayansh, will you please consider my one request? Sort the videos in the playlist in proper order. I'm watching this video and you mentioned that we have covered strategy and observer etc but in the playlist, they are below this video. So, I've not covered them all. It might be case for many. Just a suggestion. Thaks again for these insights. 🙂

[@ConceptandCoding]

Hi, i have given the numbering to the videos and also mentioned in playlist description that, pls start the playlist from bottom buddy.

[@ConceptandCoding]

It's in sorted form, start from bottom and move upwards

[@harshinredzone]

@@ConceptandCoding correct but when KZbin doesn't give auto Play option in reverse order. No worries. ☺️

[@sourabhchoudhary7289]

How there is "has a" relationship btw factory and shape ? as factory don't have a shape instance it just returns it.

[@_dheerajmittal]

Hey, I was trying to get the youtube membership for your channel, but transaction keeps on failing, is it still enabled?

[@ConceptandCoding]

i am not sure buddy, i can see yesterday also some engineers joined the membership. So its working fine. you can try udemy then. Link is in Channel about section

[@khalidhashimeh]

I was hoping you would explain in English for a larger audience, thank you

[@ConceptandCoding]

i covered in english too, pls check "All Creational", "All Behavioral", "All Structural" design patterns.

[@manvendrasingh3664]

In the previous videos you said that system design should be free now you also made it for members only.

[@ConceptandCoding]

Only interview questions buddy, everything else is free

[@HEMANTVERMA-pv2pe]

Great explanation. Though 1 thing I always struggle with is if factory needs to be an interface or abstract class. In one of the scalar masterclass It was said that behaviour difference => interface, attribute commons => abstract class. Is that correct?

[@ConceptandCoding]

Why you need factory class to be interface or abstract. It can be normal class also right. Could you please elaborate your question?

[@HEMANTVERMA-pv2pe]

​@@ConceptandCoding When we talk about abstract factory design pattern. Factory needs to be abstract, rather than being a concrete class, right?

[@dhanbahadurchhettri2712]

@@HEMANTVERMA-pv2pe Ig yes, becoz it has different sub classes ( luxury and normal cars classes) under it And we want to return the factory obj assigned to those specific sub classes.. Not sure if I'm getting it right I'm assuming from the factory pattern at 5:26 , like he is assigning circle obj to Shape interface object ( he could assign square obj to Shape interface as well) , becoz both classes circle and square are implementing Shape interface

[@premium3968]

Need more of interview questions examples with pattern this vehicle pen pencil less relatable

[@ConceptandCoding]

Noted

[@aryankumar488]

Can you please provide link for demo code of abstract factory pattern as well.

[@ConceptandCoding]

Noted

[@ayushsahu8731]

How is factory pattern different from strategy pattern?

[@prasad.kenkre]

Strategy pattern is a behavioral design pattern which is basically used to interchangibly use only one algorithm using polymorphism based on the object need where as factory is a creational design pattern that delegates object creation process to other class seperating out the dependent class and its actual dependacy (object of another class that it needs)

[@darkhorse4466]

Hi Sir, just 1 doubt. What is the use of Abstract factory pattern. We could have use factory pattern itself for luxury and ordinary cars. What are the cons of using factory pattern in the scenario mentioned in the video??

[@ConceptandCoding]

Its nothing but a factory of factory. Whenever in your code you have multiple factory pattern and we want to pick which particular factory method to call, then this pattern can be used. To be honest. Factory pattern is very popularly used but Abstract Factory is very rarely used. But good to know this,

[@anookimmidisetty2939]

@@ConceptandCoding can you share code for Abstract factory pattern for the example you explained here?

[@rohan8758]

Hi shreyansh, can you please provide code/github repo of given example of Abstract Factory pattern please ? I am trying to implement it but unable to do so.

[@ConceptandCoding]

this is the link, but abstract factory pattern code seems not there, will add it : gitlab.com/shrayansh8/interviewcodingpractise/-/tree/main/src/LowLevelDesign

[@rohan8758]

Ok sir, Thanks

[@itsankit09]

Please provide real example github code links as well. Understanding these patterns are easy but we need to see how they where implemented in real code. Some ref github repo should be enough

[@ConceptandCoding]

Sure Ankit.

[@siddhantjaiswal5999]

Hey, can you please provide the onenote link or some notes images? it would be very helpful.

[@ConceptandCoding]

Sure will do

[@yogeshjoshi8021]

Can you please provide github link for the project

[@prankuragrawal1206]

I Have jpined the channel but not able to see members only videos. Please do needful

[@ConceptandCoding]

You should be able to buddy, pls check again

[@puskinmittal8956]

why are you lock the main videos ex parking lot and other.If you want to earn then you can earn via adds easily?

[@ConceptandCoding]

Those are interview questions buddy. All basics, principles, patterns and fundamentals are open.

[@sashibhushanarajput1194]

abstract factory kaa bhi code example plzz

[@ConceptandCoding]

Noted

[@shivomkumar628]

you have not explained abstract factory design properly, you should make another video for the same , also one suggestion , try to extend example of factory design pattern only for abstract factory , that will help students more to clearly understand the difference between the two

[@ConceptandCoding]

Hi Shivom. Thanks for the feedback. Sure, in Live LLD session will do that and cover in detail

[@commentator2407]

U didn't show us abstract factory Patten code😢

[@sabbulingineni]

If i want see videos of membership I need to pay 199 for lld and hld videos ?

[@ConceptandCoding]

199rs for lld, hld and java (all will get unlocked)

[@sabbulingineni]

@@ConceptandCoding can we get some notes or material. We need to pay every month right ? Once after completion we can stop it is like that ?

[@ConceptandCoding]

@@sabbulingineni yes it can be stopped anytime. notes link i have given in description section. for few it’s missing

[@sabbulingineni]

@@ConceptandCoding thanks

[@umeshkaushik710]

Its a humble request please don't make LLD & HLD paid like everyone. It was really great when all video were free. Please bhaiya

[@ConceptandCoding]

almost all videos are free only, only few interview questions are for member only buddy.

[@soundarya4314]

I really wish you explain in English

[@ConceptandCoding]

covered it in English too, pls check video no 27 in this playlist

[@premium3968]

This 1 felt fast with no code

[@ConceptandCoding]

Sorry to hear this, let me know if it's not clear, we can discuss.

[@pnthrillz]

Bro this is not a factory pattern. This is just a simple factory, it is not even considered a design pattern.

[@ekrem8847]

i am watching for a minute to decide if this is English or not

[@ConceptandCoding]

It's Hindi. But all latest videos are in English:)

[@akhilkumaramarneni8153]

github link please

[@ConceptandCoding]

gitlab.com/shrayansh8/interviewcodingpractise/-/tree/main/src/LowLevelDesign

[@mynameisjeff9124]

Dude is this english or what am I listening to?

[@ConceptandCoding]

Few initial videos are in Hindi, but I have covered them in English in later videos. Like: All Creational Design Patterns in 1 video and All Structural Design Patterns in 1 video