This Spring Boot application includes functionality for Menu Management, Order Management, and Revenue Calculation.

• Spring Boot: Spring Boot is used to set up a production-ready Spring application.
• H2 Database: H2 in-memory database is used for storing menu items.
• Map<RestId,Map<OrderId, Order>: Map Data structure is used for storing orders at each restaurant
• RESTful API: RESTful endpoints are exposed for interacting with the system.

• POST /menu/add: Add a new menu item.
• GET /menu/all: Get all menu items.
• GET /menu/all/{restId}: Get all menu items for a specific restaurant.
• DELTE /menu/remove/{menuId}: To remove a menuItem.

• POST /order/add: Add a new item to the order.
• DELETE /order/remove/{itemId}: Remove an item from the order.
• GET /order/summary: Get the total ordered items for a particular order.

• GET /revenue/{restId}: To get the revenue generated per restaurant wise.
• GET /revenue/all: To get the total revenue generate from all the restaurant.

1. Navigate to the project directory
2. Build the project: ./gradlew build
3. Run the application: ./gradlew bootRun

The application will start on http://localhost:8080. Use Postman or curl to interact with the endpoints. or use Swagger url to interact with the UI at: http://localhost:8080/swagger-ui/index.html#/

• Proper Database configuration can be done To Implement a persistent database to store orders and menu items permanently., something like this schema:
• Restaurant | id (PK) | restaurantName | description | location |

MenuItem | id (PK) | name | description | price | stock | restaurant_id (FK) |

Order | id (PK) | restaurant_id (FK) |

OrderItem | id (PK) | order_id (FK) | item_id (FK) | item_name | item_price | quantity |

• robust error handling and validation for input data can be done