30. Design Word Processor using Flyweight Design Pattern | Low Level System Design FlyWeight Pattern 

thanks for the feedback

Thank you

I have answered to Kola question. Let me check if there is any follow up question too. Thank you

Thank you

tha

Thank you

character+type+size as key?

Yes, this is the latest videos, so i keep it at top for one day and will push it down in the playlist tomm

Noted

Maybe we can change the letter type to being extrinsic too along with row and column being extrinsic, lemme know if you come across a better solution

in the cache right

Flightweight class can not be Singleton. Because you can create more than 1 object like we did in Robot and processor example. Objects with unique data. Why we need to create unique class for each character? A field in a class is sufficient in my opinion. Yes i agree with you on part that, for word processor example, in cache we can generate a key by multiple combinations. But since our explanation, i used only 1 font Arial font, so based on character only i implemented the cache.

@@ConceptandCoding amazing video.. hats off 2 u sir, but still sir, why NOT singleton?... reason being we are just updating the X and Y coordinates of a SINGLE object only (by single I mean single in terms of type, i.e HUMANOID or Dog) Its the leverage of display function which is allowing us to update a single object, but still the previous position of the character / sprite printed remains intact, as we might had already done something like print(character / humanoid-sprite) we can't create it as a singleton , is this because of the fact that there are 2 implementations (humanoid and dog)of a same Interface IRobot ??.. if that so, can we create 2 separate interfaces ?.. then in that case it wont be needing cache, as we would have 2 different singleton classes ??

There is ane more reason that it can not be Singleton because let's take an example of Humanoid only, Let's say i have to create a green color robot, red color robot, now do i have to create different classes for each color of robot, no i can use the same class but update my Cache key. Hope that clarifies why Singleton will not work here

@@ConceptandCoding I am still not convinced about why we can't use singleton. Let's take the use case u mentioned(where we need different color robots): Case 1: If we take the color as attribute in humanoid robot class , if we use singleton we need to create 2 objects, so as in case of using cache in factory. Case 2: since the color is extrinsic, we can remove it as attribute and put it as parameter in display method, so in that case if we use singleton, we create only one object for humanoid and same as using caching. So I don't see any extra advantage of caching here.

@@kolasphoorti1030 don't think singleton would be efficient since if you go with that approach we would need to create 26 classes which will be a lot of duplicated code.Singleton only allows one instance of a class so we would have to create 26 classes for each character from scratch whereas in the example in the video they used only one class ILetter to hold 26 characters then 26 instances for each character is mapped to the Hash.

The map logic in the Flyweight pattern is not thread-safe by default and requires concurrency mechanisms like synchronized blocks or ConcurrentHashMap to ensure thread safety. Intrinsic data should not be static to avoid concurrent modification issues and complex lifecycle management. The Flyweight pattern aims to share immutable common state while allowing unique extrinsic state per instance.

Factory class is thread safe. In this scenario of factory method it worked on member variable which is HashMap, we can use concurrent HashMap if required.

@@ConceptandCoding Okay, thank you sir for the explanation.

Yes Sprite is a 2D bitmap, which is used to create an object on screen. But yes this is just an example I think of, there can be different examples too.

Hi, instrinic data is one which are common for all and do not change once set. If this example, i make it instrinic, means font size is same for all characters. But in your case, if it's changes, then we can make it extrinsic and passed in display method.

Any OOPs language can be used

Sir waiting for ur reply 😊

In the Flyweight design pattern, intrinsic data, such as font or size, is shared among multiple objects. If the intrinsic data needs to change, you either create a new flyweight object with the updated data or update the existing flyweight object, ensuring that all dependent objects are updated accordingly.

I did not get the question, intrics data mean common data only. How extrinsic will be common (if it's common then it's not extrinsic)

@@ConceptandCoding oh got it ok, that means if we don't have intrics data than we cannot apply flyweight pattern, right?

@@gurupreetsingh8347 yes

@@ConceptandCoding thanks buddy

i have kept HLD and LLD topics in respective playlist buddy

If you understand the concept it would really help you in interview

@@ConceptandCoding Thank you sir. One more question. This is good for Microsoft fresher system design interview ???

Thanks buddy. I am adding it