Uber/Ola Low Level System Design explained with CODE, UML Diagram | Easy & Detailed Explanation!!
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- Опубликовано: 2 авг 2024
- You asked for it and it’s here. If you have ANY doubts, I am here to solve that as well!
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Here's the Code and UML Diagram for reference-
github.com/keertipurswani/Ube...
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The video has following parts-
0:00-0:19 - Introduction
0:19-2:50 - Imp steps for trip creation
2:50-7:35 - Managing Riders & Drivers
7:35-9:08 - Trip meaning
9:08-16:55 - DriverMatching & Pricing Strategy
16:55-19:45 - Trip Meta Data
19:45-20:55 - Strategy is per trip
20:55-24:50 - Trip Manager
24:50-26:00 - Cab Creation
26:00-30:47 - UML class diagram in detail
30:47-48:03 - Code Walkthrough with output
#systemdesign #lowleveldesign #software-engineer
One of the best LLD videos I have watched so far! Thank you.
Thank you so much keerthi. I had several doubts in lld, this video cleared almost all of them.
Hi Kreeti great work , I have watched all LLD videos they are very well explained , I really appreciate yr time and effort.
Thank you so much Keerti for putting so so much efforts in the videos. ❤. Keep growing and Glowing !
Greatttttt please dont stop this series
I love your attitude. Thanks for the video!
Thankyou for such amazing explanation .Apreaciate the hardwork you have put
It's gives me atmost satisfaction as I understood this video very well❤❤❤
Amazing content, Keerti. So helpful.
Thanks, Keerti for creating this excellent video with the entire thinking flow with a coding sample. Really appreciate your time and effort behind such a great video. Expecting more from your channel.
dedication what it is!! Hats off to u di
thanks keerti !! this very interesting and important topic .
really help to understand the concept and LLD design flow...🤩
This is excellent! Thank you for creating this video.
thank for creating these excellent LLD,with such effort
Loved the content and the way you explained. Please continue creating more such content. ❤
Super helpful. Thank you for putting in all the effort to create this.
This is so helpful. Thanks for the video Keerti
Amazing Explannation
loved this
This is really amazing.. thank you Keerthi..
Best Low Level Design Tutorial Thanks for clear-cut explanation.
Thank you so much Keerthi It's a really nice explanation.
Very nice content created. Kindly prepare videos like this in detail since I had seen your mock interview videos earlier they were not much in depth and in real interviews , interviewers ask in detail
Finally, was waiting for this!
Hope you like it! ❤️😇
Excellent video Keerti..
Thanks for the wonderful explanation, please keep on posting more videos and playlist related to LLD , design patterns, HLD with proper roadmap from scratch to end in order.
Great work!!
Such an informative video, Thanks Keerti !!
Keerti Rocks
Thank you, no one explained LLD the way you did.
What a nice explanation.
Amazing video. Described very well.
Great content. Very helpful.
Super highly appreciated the efforts.
Thankyou for the effort! 🙏🏼😀
Thanks for the detailed explanation
Loved the video and the word Hotch Motch😊
This is so helpful mam, Thanks a lot for the efforts:)
Thank you dear for your efforts god bless you ❤❤
Thanks for putting a lot of effort in making UML diagrams as well as clearly explaining thought process behind chosing class relationships & Also, for explaining how to make design scalable and extensible in case if we need to add different strategies for driver matching and price calculation.
BTW, this is my first youtube comment ever. Thanks Again!!!!
Thank you for the insightful video on design systems. I appreciate the clarity in your explanation. I'm curious about the "pricing calculation
" process after selecting a driver. In the typical scenario, a rider selects the origin and destination first and then would like to see the corresponding fare before confirming the trip request. It seems intuitive to have the pricing information available at this stage, and then proceed to assign a driver once the rider confirms the trip. I understand this may involve simplification, but it seems crucial to treat pricing as an independent factor from the driver assignment.
However, I acknowledge my perspective might be influenced by the absence of Uber in Iran, where the services we utilize may follow a different implementation approach. If my understanding is incorrect, I would appreciate any clarification on this matter. Thank you again for the informative content.
Nice explanation
amazing video!
An excellent LLD video; I appreciate the work
Small Doubt: why are we passing pricingStartegy and driverMatchingStartergy pointers to the Trip class?
In what scenarios these instances of strategies are needed in Trip class.
Thank you so much for this video
Trip Manager should have a composition relationship with RiderManager, but an aggregation with Driver Manager, because a trip is created only if a rider is there. It's like a body can be there only if eye is there. Rider is totally a part of the trip, particularly when rider is creating trip. Although I think this should be true for the limited functionality that we discussed right now. Maybe for more expansion its better to have an aggregation relationship with rider manager as well
Hi Keerti,
Thanks for the video. It was super clear.
I just had one doubt. Why do we need an instance of riderManager and driverManager in TripManager. I see those instances are not being used anywhere in the TripManager class.
Flawless
Amazing keerti... understood the lld first time... but a request... explain it slowly...its very fast
Wow ! Keerti- great work
Excellent contribution. Please keep it up
कभी महक की तरह हम गुलों से उड़ते हैं
कभी धुएं की तरह पर्वतों से उड़ते हैं
यह क्या उड़ने से ख़ाक रोकेंगे
कि हम परों से नहीं हौसलों से उड़ते हैं
Thanks!
Mind blowing explanation, best content ever found on LLD so far, really liked the flow of your explanation....overview, UML class diagram and then code. Thanks Keerti!! ✨
Thanks, nice content❤
are the maps inside all the above singleton classes thread safe? if not,
we might have to have mutex lock before setting the value inside map& then unlock right
?
There are many LLD questions on the basic features of large systems like WhatsApp(How to manage users, send messages, receive messages, and manage groups), Facebook, and Twitter.
Please help us by making videos on that too by covering the basics of those.
It will be really beneficial for us.
please also show us on how you are building the code in the end. That would be helpful
Thanks for taking the time and doing this video. It is very interesting and informative.
But can you please slow down a little bit when you are talking.
Thanks
Keep it up beta 👍👍
Thanks Keerti for yet another amazing video.
I have a noob question:
The RiderManager was created with a single instance. I suppose that is a single instance for each host (assuming we will have the code deployed in multiple hosts). How do we manage those multiple single instances from each host working on a single or multiple DB? Thanks in advance.
Thanks keerthi for an excellent video. It was very helpful as we used to see many video with explanations but not this much detailed explanation with code and UML. Please add more designs like this with code and UML. Hats off to you for your contribution
Hi Keerti, when it is a coding problem, I will try to find solution to it whereas for system design i dont know what i am doing and also, it's not right if I just do as you do by mugging up.. Please help in understanding how can I gain confidence in system design things
@KeertiPurswani Thanks so much♥ Is the manager class same as service class we use in Spring Boot?
My quest for the best LLD tutorial concludes here
Thank you so much
Keep up the good work
Thank you! ❤️
Thanks nice content. Do we have separate video for strategy design pattern?
very good content
Great Work please make a video on low level design of CRED app
This is so so helpful. Thanks Keerti for making this kind of video. Now you have responsibilty of making such more videos.
this video is very good, lot of videos only describe but will not show in coding.
We have different cars,auto avaible over uber and ola both, that we need to mention in this , right ?
What does the mtx:mutex represent in the above uml?
thank youuuu❤❤
❤️❤️😇😇
I love the intelligent lady ❤
Nice video. Would it be possible to have the code for the same in Java?
i am very confused choosing abstract class and interface for achieving abstarction By choosing anyone implement in Uber/Ola Low Level System Design it does not effect any thing and we make the code loose coupling with one to other .
In my case i choosing according to derived class
1.if derived class extends only multiple classes then i choose interface because java does not support multiple inheritence.
can anyone tell me which one should i select and in which case?
where do we use these classes and create this structure while building the product? FE? BE? or this is just some theory stuff that is never used in actual implementation?
@23:30 Hey Keerti,
There is relationship between TripManager to StrategyManager so don;t u think the relationship between StrategyManager and TripMetadata is redundant?
I really appreciate the amount of work you have put into it so I shared in my group
Hey could you please provide the code in java
Please 🥺
What a coincidence .... i need in java too😢
I don't think Strategy Manager has to be singleton! But overall great explanation :)
Thank you for this amazing video. Which IDE are you using for building and running this project ?
Visual Studio
Great explanation, I just assumed that we send requests to nearest drivers and pricing is all based on km travelled. so I didn't get into this pricing strategy and driver strategy, but its a good thing to demonstrate in an interview.
What is hpp ? Do you have solution in Java
Improv: Builder patterns can used for the Metadata or other Objects instead of Constructor parameters.
Thank you so much, Keerti. What an amazing video. Your thoughts and efforts are absolutely visible. It cleared so many of my concepts and doubts, at the same time, helped me a lot with my confidence for the interviews and LLD rounds. Subscribed and definitely gonna share this video and your content with others. Big thumbs up.
I think you did not use riderMgr and driverMgr in your tripMgr at all, can we skip it in UML too?
Nicely done. Thanks. Very much informative and brainstorming.
We can decide to do Strategy run time, may be based on timing or location. That would be nice.
Very nicely explained and implemented Keerti! Thanks for sharing!
Attendance marked . This content is better than paid courses that white board is worth ❤️. Going replay to the same comment when i complete the whole video ❤️
A small doubt maam,
I have often seen lld videos in java..
Is java more preferred in interview rounds by interviewers or it doesnt matter as far as we are able come up with solution?
doesn't matter unless job posting or recruiter specifically mentions that opening is only for a specific programming language
Please make some more on lld 😊
I am not able to understand : Why you have created riderMgr and driverMgr in TripMgr?
They are never initialized or used!
Do you think somebody can come up with this solution and then code it in a hour or hour and a half long interview?
@keerti You mentioned all the managers should be singleton across all trips, I believe all the manager should be singleton for a particular trip instead of all trips. please correct me if I am missing something here.
If trips cannot exist without TripManager and you are making that a composition, then why can't we say the same thing about RiderManager? Riders cannot exist without RiderManager as well. I am unable to clearly understand what's the difference between the relationships of Trip-TripManager versus Rider-RiderManager.
Why not use unique_lock?
Thanks for the session, its amazing !But quad ka explanation kidhar h ...
Channel kholke dekha toh karo 🫢
Here’s the link. Hope you like it ❤️
ruclips.net/video/kClPBNmTCf0/видео.html
Most of the videos and courses out there have code in java, can you please provide java code also?
Superb video, can see the work gone behind it.
One tweak could be having a TripRequest class that has status: {pending, accepted, in progress, completed, cancelled} etc and when the driver accepts, it creates a Trip object and returns it.
Thanks for the video. It's very informative and good. One request though. Can you please create a playlist for all the design patterns?
Nice explanation and use of those design patterns !
One question, why do we have a strategy for matching of drivers to riders? In actual scenario, it is upto the drivers in that region to accept the user's trip or not right? The ride request of the user is sent to all the drivers in that bounded region where the user has to start the trip I believe.
To emulate in this LLD, we can maybe use a mediator for communication of a ride request to all drivers nearby, and whichever driver accepts the trip request, we again use the mediator to inform the owner of the ride request, i.e, the rider. How does that seem?
Waiting for your feedback !