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The Tool Rental Service is simple tool rental application with the below features:
- Customers rent a tool for a specified number of days.
- When a customer checks out a tool, a Rental Agreement is produced.
- The store charges a daily rental fee, whose amount is different for each tool type.
- Some tools are free of charge on weekends or holidays.
- Clerks may give customers a discount that is applied to the total daily charges to reduce the final charge.
- The service exposes an REST API that supports the below resources/operations
- Operation to read all available tools
- Operation to add/delete tools available for rent [Future state]
- Operation to read pricing details per tool
- Operation to add/update pricing details per tool [Future state]
- Operation to checkout and create a rental agreement per tool
- Each operation should validate user entered input and throw
HTTP BAD Requestfor validation errors - The service should follow an API First Design approach while adding new functionality. See API First Design approach for more details
- The service should auto-generate Spring REST code using the supplied Open API file. The OpenAPI file is available here
The Class Diagram includes some classes auto-generated from the OpenApi specification for this service
- The OpenAPI specification for the Tool Rental Service is available here.
- Please use a API first approach to implement this service. Use an OpenAPI tool to generate the API related classes
- Create an RentalAgreementService service that implements the API functionality
- Create JPA repository classes to interface with the database
- ToolRepository to fetch available tools from the database
- ToolPriceRepository to fetch pricing details about a tool
- RentalRequestRepository to persist each rental request in the database
- RentalAgreementRepository to persist rental agreements in the database
---
title: ToolRentalService Class Diagram
---
classDiagram
ToolRentalAPI <-- Tool
ToolRentalAPI <-- ToolRentalPrice
ToolRentalAPI <-- RentalRequest
ToolRentalAPI <-- RentalAgreement
ToolRentalAPI <|-- AbstractController
class Tool{
}
class ToolRentalPrice{
}
class RentalRequest{
}
class RentalAgreement{
}
class AbstractController{
}
IRentalAgreementService <|-- RentalAgreementService
class RentalAgreementService{
}
IRentalAgreementService <-- AbstractController
ToolRepository <-- RentalAgreementService
ToolPriceRepository <-- RentalAgreementService
RentalRequestRepository <-- RentalAgreementService
RentalAgreementRepository <-- RentalAgreementService
IHoliday <|-- FourthJuly
IHoliday <|-- LaborDay
IHoliday <|-- Weekend
IHoliday <|-- ObserverableHoliday
IHoliday: +isHoliday()
class FourthJuly{
+isHoliday()
}
class LaborDay{
+isHoliday()
}
class Weekend{
+isHoliday()
}
class ObserverableHoliday{
+isHoliday()
}
Class Diagram
Sequence diagram for fetching all tools available for rent in the system
Sequence diagram for fetching pricing details per tool
Sequence Diagram to checkout out a tool for rent
Expand to view code
{
"openapi": "3.0.1",
"info": {
"title": "ToolRentalApi",
"description": "An API to facilitate the rentai of tools",
"termsOfService": "",
"contact": {
"email": ""
},
"license": {
"name": "",
"url": "http://unlicense.org"
},
"version": "1.0"
},
"servers": [
{
"url": "http://localhost:3000",
"description": "Generated server url"
}
],
"paths": {
"/api/v1/tool/{code}/checkout": {
"post": {
"tags": [
"Tool"
],
"summary": "Create a rental agreement",
"operationId": "postApiV1ToolCodeCheckout",
"parameters": [
{
"name": "code",
"in": "path",
"required": true,
"schema": {
"type": "string"
}
}
],
"requestBody": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/RentalRequest"
}
}
},
"required": true
},
"responses": {
"200": {
"description": "OK",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/RentalAgreement"
}
}
}
}
}
}
},
"/api/v1/tool/{code}/inventory": {
"get": {
"tags": [
"Tool"
],
"summary": "Get Inventory details",
"operationId": "getApiV1ToolInventory",
"parameters": [
{
"name": "code",
"in": "path",
"required": true,
"schema": {
"type": "string"
}
}
],
"responses": {
"200": {
"description": "OK",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Inventory"
}
}
}
}
}
}
},
"/api/v1/tool/{code}": {
"get": {
"tags": [
"Tool"
],
"summary": "Get pricing details",
"operationId": "getApiV1ToolCode",
"parameters": [
{
"name": "code",
"in": "path",
"required": true,
"schema": {
"type": "string"
}
}
],
"responses": {
"200": {
"description": "OK",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/ToolPricingDetails"
}
}
}
}
}
}
},
"/api/v1/tool/rentalAgreement": {
"get": {
"tags": [
"RentalAgreement"
],
"summary": "Get all rental agreements",
"operationId": "getAllRentalAgreements",
"responses": {
"200": {
"description": "OK",
"content": {
"application/json": {
"schema": {
"type": "array",
"items": {
"$ref": "#/components/schemas/RentalAgreement"
}
}
}
}
}
}
}
},
"/api/v1/tool": {
"get": {
"tags": [
"Tool"
],
"summary": "Get tools available for rent",
"operationId": "getApiV1Tool",
"responses": {
"200": {
"description": "OK",
"content": {
"application/json": {
"schema": {
"type": "array",
"items": {
"$ref": "#/components/schemas/Tool"
}
}
}
}
}
}
}
}
},
"components": {
"schemas": {
"RentalRequest": {
"required": [
"checkout_date",
"rental_days_count",
"tool_code"
],
"type": "object",
"properties": {
"tool_code": {
"type": "string",
"readOnly": true
},
"rental_days_count": {
"type": "integer",
"format": "int32"
},
"discount_percent": {
"maximum": 100,
"minimum": 0,
"type": "integer",
"format": "int32"
},
"checkout_date": {
"type": "string"
}
}
},
"RentalAgreement": {
"required": [
"checkout_date",
"tool_code"
],
"type": "object",
"properties": {
"tool_code": {
"type": "string"
},
"tool_type": {
"type": "string"
},
"tool_brand": {
"type": "string"
},
"rental_days": {
"type": "string"
},
"checkout_date": {
"type": "string"
},
"due_date": {
"type": "string"
},
"daily_charge": {
"type": "number"
},
"charge_days": {
"type": "number"
},
"pre_discount_charge": {
"type": "number"
},
"discount_percent": {
"type": "string"
},
"discount_amount": {
"type": "number"
},
"final_charge": {
"type": "number"
}
}
},
"Inventory": {
"required": [
"current_count",
"max_available",
"tool_code"
],
"type": "object",
"properties": {
"tool_code": {
"type": "string"
},
"max_available": {
"type": "number"
},
"current_count": {
"type": "number"
}
}
},
"ToolPricingDetails": {
"required": [
"code",
"daily_charge",
"holiday_charge",
"weekend_charge"
],
"type": "object",
"properties": {
"code": {
"type": "string",
"description": "Unique identifier for a tool instance"
},
"daily_charge": {
"type": "number",
"description": "Daily Charge of the tool"
},
"weekend_charge": {
"type": "boolean",
"description": "Is the tool chargable on weekends?"
},
"holiday_charge": {
"type": "boolean",
"description": "Is the tool chargeable on observed holidays?"
}
},
"description": "Rental price details about each tool available for rent"
},
"Tool": {
"required": [
"brand",
"code",
"type"
],
"type": "object",
"properties": {
"code": {
"type": "string",
"description": "Unique identifier for a tool instance"
},
"type": {
"type": "string",
"description": "The type of tool."
},
"brand": {
"type": "string"
}
},
"description": "Tools available for rent"
}
}
}
}Request to fetch all tools available for rent
The below curl command can be used to fetch all available tools
curl --location 'http://localhost:3000/api/v1/tool' \ --header 'Accept: application/json'
Fetch All Available tools Response
The service should respond back with the below json:
[
{
"code": "CHNS",
"type": "Chainsaw",
"brand": "Stihl"
},
{
"code": "LADW",
"type": "Ladder",
"brand": "Werner"
},
{
"code": "JAKD",
"type": "Jackhammer",
"brand": "DeWalt"
},
{
"code": "JAKR",
"type": "Jackhammer",
"brand": "Ridgid"
}
]Request to fetch pricing details for a tool
The below curl command can be used to fetch all available tools
curl --location --globoff '{{baseUrl}}/api/v1/tool/:CHNS/rentalprice' \ --header 'Accept: application/json'
Response to fetch pricing details for a tool
{
"code": "CHNS",
"daily_charge": "2.99",
"holiday_charge": "true",
"weekend_charge": "false"
}Request to checkout and create a rental agreement
The below curl command can be used to checkout and create a rental agreement
curl --location --globoff '{{baseUrl}}/api/v1/tool/CHNS/checkout' \ --header 'Content-Type: application/json' \ --header 'Accept: application/json' \ --data '{ "checkout_date": "01/12/2024", "rental_days_count": "10", "tool_code": "CHNS", "discount_percent": "10" }'
{
"checkout_date": "01/12/2024",
"rental_days_count": "10",
"tool_code": "CHNS",
"discount_percent": "10"
}Sample Response to checkout and create a rental agreement
The service should respond back with the below json
{
"tool_code": "CHNS",
"tool_type": "Chainsaw",
"tool_brand": "Stihl",
"rental_days": "10",
"checkout_date": "01/12/2024",
"due_date": "01/22/2024",
"daily_charge": 2.99,
"charge_days": 7,
"pre_discount_charge": 20.93,
"discount_percent": "10%",
"discount_amount": 2.09,
"final_charge": 18.84
}The service responds with the below error codes for invalid inputs
| Error Condition | Response Code and Desciption |
|---|---|
| Unknown Tool Code | Http 400 Bad Request Invalid tool code |
| Invalid or missing checkout date | Http 400 Bad Request Invalid or missing checkout date |
| Invalid discount percent | Http 400 Bad Request Invalid discount %. Please enter a value between 0-100 |
- All business errors should be wrapped in an
ValidationExceptionclass - Communicate business exception as HTTP 400 Bad Request
Sample error handling Spring-based RestService . Reference Error Handling for Spring Rest Services
@ControllerAdvice
public class RestResponseEntityExceptionHandler
extends ResponseEntityExceptionHandler {
@ExceptionHandler(value
= { ValidationException.class })
protected ResponseEntity<Object> handleConflict(
RuntimeException ex, WebRequest request) {
String bodyOfResponse = "This should be application specific";
return handleExceptionInternal(ex, bodyOfResponse,
new HttpHeaders(), HttpStatus.BAD_REQUEST, request);
}
}