Implementing User and Medicine Modules using Service Layer

Business Scenario

The objective of this lab is to implement User and Medicine module APIs using a structured service layer approach. The focus is on applying business logic, handling validations, and exposing REST APIs for frontend integration.

Service Layer Design

The service layer is responsible for:

Applying business logic
Validating input data
Preventing duplicate record

Managing update operations
Handling filtering logic

Functionalities

1. Add User

Ensure email is unique
Prevent duplicate registration

2. Get All Users

Fetch all users for UI display

3. Update User

Update only if user exists
Modify all required fields

4. Filter Users by Role

Filter based on USER / ADMIN
Case-insensitive comparison

Step 3: User Business Logic

Duplicate Email Check

Prevents multiple accounts with same email

Safe Update

Ensures only valid user is updated

Role Filtering

Helps frontend implement role-based dashboards

Implement MedicineService

Functionalities

1. Add Medicine

Prevent duplicate medicine names

2. Get All Medicines

Used to display medicine store

3. Update Medicine

Update only if medicine exists

4. Filter by Category

Filter medicines like Pain Relief, Vitamins

Medicine Business Logic

Duplicate Medicine Prevention

Avoids redundant medicine entries

Safe Update Logic

Prevents invalid updates

Category Filtering

Helps frontend implement search/filter features

Controller Layer (User + Medicine)

Controller responsibilities:

Accept HTTP requests
Pass data to service layer
Return responses to frontend

API Endpoints

User APIs

POST /api/users → Add User
GET /api/users → Get All Users
PUT /api/users/{id} → Update User
GET /api/users/filter?role=USER → Filter Users

Medicine APIs

POST /api/medicines → Add Medicine
GET /api/medicines → Get All Medicines
PUT /api/medicines/{id} → Update Medicine
GET /api/medicines/filter?category=Pain Relief → Filter Medicines

Run Application

Start Spring Boot application
Verify APIs are running

Application running

Test APIs

Test all APIs:

User:

POST
GET
PUT
FILTER

Medicine:

POST
GET
PUT
FILTER

Pre-Lab Preparation

Explore different restaurants
View food items and menus
Add items to cart
Place orders online

Topic : Weaving the world of Web

1) Navigating the world of Web

2) Building Blocks of Website,

3) Tag Titans: Fundamental Web Construct.

git pull origin branchName

Git Pull

Task 1: Understanding BRD

Before you start building anything, you need to clearly understand what the client actually wants.So, let’s begin by understanding the BRD (Business Requirement Document) shared by the client.

BRD Full Form is Business Requirement Details.BRD like a plan for building a house. This plan helps the builder understand what to build.In the same way,BRD tells developers what the client wants to build

Click to download BRD : BiteBox_BRD.pdf

Activity

After going through BRD list down the Core Features and Web Pages in the tabulated Format as shown Below.

Col 1	Col 2	Col 3
Row 1
Row 2
Row 3

Formula

Profit = Revenue - Cost

Task 2: Create WireFrame

Now that you understand the requirements, don’t jump into coding yet. Before development, we always visualize the layout.

Now lets create a simple wireframe for the homepage.

A wireframe is like a layout plan of a house. Before building, you decide where rooms, doors, and windows will be placed.Similarly, a wireframe helps you plan where elements like headers, images, and buttons will appear on a webpage—before adding design or colours.

Task 3: Code Editor Installation

Good work on completing the planning phase.

Now we will start development. Before that, make sure your system is ready with the required tools.

In this step we will install the VS code editor that will help to Write code efficiently,Organize files , Run and test your application

Go to the visual studio code official website

Click to download Homepage Wireframe : Homepage Wireframe

Link - https://code.visualstudio.com/download

Choose your operating system(windows / Mac) and download the installation file.

Double click on the download app and Accept the agreement and click next

It is a long established fact that a reader will be distracted

Sub Steps

Double click on the download app and Accept the agreement and click next

public class MathSample {
    public static void main(String[] args) {
        int x = 10;
        int y = 20;
        int sum = x + y;
        
        System.out.println("The sum is: " + sum);
    }
}

public class MathSample {
    public static void main(String[] args) {
        int x = 10;
        int y = 20;
        int sum = x + y;
        
        System.out.println("The sum is: " + sum);
    }
}

public class MathSample {
    public static void main(String[] args) {
        int x = 10;
        int y = 20;
        int sum = x + y;
        
        System.out.println("The sum is: " + sum);
    }
}

Great job!
You have successfully completed your first lab on BiteBox Project Onboarding.

In this lab, you have: Understood the BRD, Created a wireframe, Set up your development environment, Organised your project structure, Run your first program

You are now ready to move to the next stage of development

Checkpoint

Next-Lab Preparation

Git Push

git push origin branchName

Topic : Working with a Text and Listin HTML

1) Power of HTML text tags
2) Customizing your style with CSS
3) Listing it right using HTML
4) HTML Link up , attributes of tag, block vs inline elements

Text box Width : 887
Business Scenario, Pre-lab Preparation, Next-lab Preparation, Task, Activity, Checkpoint : 90%.
Steps : 1,2,3 [Sub Steps - a,b,c]
Normal Text, Topic Name : 80%
Subtopic : 70%
Code Box font Size : 16px

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