doyunbk / spring-boot-project

Spring Boot Project 🍋

✨ Intro

This application is built to order the investment products

🚀 Built with

• Spring Boot 2.6.0
• Java 8
• H2
• JPA
• Maven
• Junit5

📦 Structure

Entity

• Product

fields : productId, title, totalInvestmentAmt, currentInvestmentAmt, noOfInvestors, status,  startAt, finishAt

• Order

fields : orderId, userId, productId, title, totalInvestmentAmt, investAmt, createdAt

CRUD API Operations

1. Product

• Create : Create a Product
• Get : Fetch Product details
• Get : Fetch Product details for a specific duration

2. Order

• Create : Create an Order 🚨 HTTP Header : 'X-User-ID'
• Get : Fetch Order details for a given User 🚨 HTTP Header : 'X-User-ID'

👨🏻‍💻👩🏻‍💻 Example of Usage

In this project, a sample data set is already included in H2 database

INSERT INTO Product(product_id, title, total_investment_amt, current_investment_amt, no_of_investors, status, start_at, finish_at) VALUES (1, 'annuity', 1000, 100, 10, true, '2021-01-01', '2021-12-31')
INSERT INTO Product(product_id, title, total_investment_amt, current_investment_amt, no_of_investors, status, start_at, finish_at) VALUES (2, 'bond', 2000, 500, 20, true, '2021-05-01', '2021-12-31')
INSERT INTO Product(product_id, title, total_investment_amt, current_investment_amt, no_of_investors, status, start_at, finish_at) VALUES (3, 'saving bond', 5000, 2000, 5, false, '2021-03-01', '2021-05-01')
...

1. Search all the investment products

curl --location --request GET 'http://localhost:8080/api/products/'

2. Order an investment product

curl --location --request POST 'http://localhost:8080/api/order/' \
--header 'X-USER-ID: 1' \
--header 'Content-Type: application/json' \
--data-raw '{
    "productId": "1",
    "investAmt": 100
}'

3. Find my investment orders

curl --location --request GET 'http://localhost:8080/api/order/' \
--header 'X-USER-ID: 1'

🤔 Thoughts

When a number of users are trying to order investment products at the same time, a huge bottleneck could be an issue about accessing data and reliability of the system.

Synchronized methods is being used as an implicit lock to allow only one thread to execute at any given time. Therefore, when multiple threads executing simultaenously, and access the same resource at the same time, thread-safe can be acheived to resolve inconsistency problems by allowing only one thread at a time.