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Implementation of Gang of Four design patterns in Java

Java 100.00%

design-patterns's Introduction

Hey there I'm Tanmay

👨🏻‍💻 About Me

💡 I'm a Computer Science and ML Engineer who has spent 8+ years building scalable distributed systems, optimisation engines and low latency financial systems. These days I just wrangle LLMs. 🤖
🎓 I'm an alumnus of NIT Allahabad. A proud Moti ka lal :D
🎓 My most recent academic misadventure was as postgraduate student studying Artificial Intelligence at the School of Aerospace at Cranfield University.
🛠 My last work project was building NodeIQ at Locus.sh. I have previously worked for Practo.
🌱 The brain fascinates me and you had me at Computational Neuroscience.
🌱 The space is where we are headed, and that just might save us from impending doom.
✉️ If you need a consultation on your project, you can reach me at [email protected].
✉️ If you want to say Hi, you can email me at [email protected].

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design-patterns's Issues

implementation of builder pattern in typescript

Hi,
implementation of builder pattern in TS looks like -

export class Student {
name: String;
age: Number;

constructor(studentBuilder: StudentBuilder) {
    this.name = studentBuilder.name;
    this.age = studentBuilder.age;
}

}

export class StudentBuilder {
private _name: String = "";
private _age: Number = 0;

constructor(){
    
}

setName(name: String) {
    this._name = name
    return this
}

setAge(age: Number) {
    this._age = age
    return this
}

get name(): String {
    return this._name
}

get age(): Number {
    return this._age
}

build() {
    return new Student(this);
}

}

==================================================
client code:
const student = new StudentBuilder().setName("vijay").setAge(29).build()

======================================================

but in java it is some what different.

or there is better way to implementing it.

Netflix Assignment

Exercise

Design the class Diagram and database Schema for a system like Netflix with following Use Cases.

Netflix has users.
Every user has an email and a password.
Users can create profiles to have separate independent environments.
Each profile has a name and a type. Type can be KID or ADULT.
There are multiple videos on netflix.
For each video, there will be a title, description and a cast.
A cast is a list of actors who were a part of the video. For each actor we need to know their name and list of videos they were a part of.
For every video, for any profile who watched that video, we need to know the status (COMPLETED/ IN PROGRESS).
For every profile for whom a video is in progress, we want to know their last watch timestamp.

Solution

Class Diagram

classDiagram
    direction LR
    class User {
        +String name
        +String email
        -String password
        -String phone
        +getName() String
        +getEmail() String
        +getPhone() String
    }
    
    class Profile {
        +User user
        +ProfileType type
        +String name
        +Video[] videos
        +getVideoStatus(Video) : String
        +getVideoProgress(Video) : Datetime
    }

    class ProfileType {
        <<enumeration>>
        KID
        ADULT
    }

    Profile "*"-->"1" ProfileType
    User "1"*--"*" Profile : has

    class VideoStatus{
        <<enumeration>>
        COMPLETED
        IN_PROGRESS
        RECOMMENDED
    }

    class Video {
        +String title
        +String description
        +Actor[] cast
    }
    
    class Actor {
        +String name
    }

    Profile "1" --o "*" Video
    Video "*"--o"*" Actor

ER Diagram

erDiagram
    USER {
        int id PK
        varchar name
        varchar email
        varchar password
        varchar phone
    }

    PROFILE {
        int id PK
        varchar name
        enum type
        int user_id FK
    }

    USER ||--|{ PROFILE : creates
    
    VIDEO {
        int id PK
        varchar title
        varchar description
    }
    ACTOR {
        int id PK
        varchar name
    }
    CAST {
        int id PK
        int video_id FK
        int actor_id FK
    }

    PROFILE_VIDEO {
        int id PK
        int profile_id FK
        int video_id FK
    }

    PROFILE ||--o{ PROFILE_VIDEO : has
    VIDEO ||--o{ PROFILE_VIDEO : has
    VIDEO ||--|{ CAST : has
    ACTOR ||--|{ CAST : part_of

Prototype Design Pattern

In the sample code of Prototype Design pattern, the User class is declared as an abstract class but just below that it's been instantiated with the new keyword which is a syntax error in Java as objects of Abstract classes can't be created.

Netflix Assigment

Take Home Exercise

Design the class Diagram and database Schema for a system like Netflix with following Use Cases.

Netflix has users.
Every user has an email and a password.
Users can create profiles to have separate independent environments.
Each profile has a name and a type. Type can be KID or ADULT.
There are multiple videos on netflix.
For each video, there will be a title, description and a cast.
A cast is a list of actors who were a part of the video. For each actor we need to know their name and list of videos they were a part of.
For every video, for any profile who watched that video, we need to know the status (COMPLETED/ IN PROGRESS).
For every profile for whom a video is in progress, we want to know their last watch timestamp.

MY SOLUTION

NETFLIX

Class Diagram

classDiagram
direction TB
    class User {
        -String email
        -String password
    }
    
    class Profile {
        -User user
        -String name
        -ProfileType type
        -Video[] videos
    }
    
    class ProfileType {
        <<enumeration>>
        ADULT
        KID
    }
    
    class VideoStatus {
        <<enumeration>>
        COMPLETED
        IN_PROGRESS
    }
    
    class Video {
        -String title
        -String descripiton
        -Actor[] cast
    }
    
    class Actor {
        -String name
    }
    
    class ProfileVideo {
        Profile profile
        Video video
        VideoStatus status
        DateTime timeStamp
    }
    
    User "1" *-- "*" Profile
    Actor "*" o-- "*" Video
    Video "*" o-- "*" Profile
    Profile *-- ProfileVideo
    Video *-- ProfileVideo

erDiagram
    USER {
        int id PK
        String email
        String passoword
    }
    
    PROFILE {
        int id PK
        String type
        int user_id FK
    }
    
    ACTOR {
        int id PK
        String name
    }
    
    VIDEO {
        int id PK
        String title
        String description
    }
    
    ACTOR_VIDEO {
        int actor_id FK "Composite PK"
        int video_id FK "Composite PK"
    }
    
    VIDEOSTATUS {
        int id PK
        String name
    }
    
    PROFILE_VIDEO {
        int profile_id FK "Composte PK"
        int video_id FK "Composite PK"
        int video_status_id FK
        DateTime timestamp 
    }

kanmaytacker / design-patterns Goto Github PK

design-patterns's Introduction

Hey there I'm Tanmay

👨🏻‍💻 About Me

📚 Latest publications

🔧 Latest work

✍ Latest posts

📖 Reading list

🔧 Technologies & Tools

📫 How to reach me:

If you like what I do

design-patterns's People

Contributors

Stargazers

Watchers

Forkers

design-patterns's Issues

Hi, implementation of builder pattern in TS looks like -

Exercise

Solution

Class Diagram

ER Diagram

Take Home Exercise

Design the class Diagram and database Schema for a system like Netflix with following Use Cases.

MY SOLUTION

NETFLIX

Class Diagram

Recommend Projects

Recommend Topics

Recommend Org

Hi,
implementation of builder pattern in TS looks like -