Case Study - Sample Book Delivery App (Spring Boot, Spring Security , Mysql, JUnit, Integration Test, Docker, Test Container, AOP, CI/CD, Prometheus, Grafana, Github Actions)

System design exercises by Arpit Bhayani

A basic hotel reservation system with 2PC using pessimistic and optimistic locks in Go

distributed and local lock provider

In this repo I would like to show 4 strategies of concurrency control for writing data using Python SQLAlchemy ORM and PostgresSQL (however this examples could be easily transformed to plain SQL).

A basic e-commerce application is built using Go/Gin and follows micro-service architecture

Examples of applying pessimistic and optimistic concurrency control with AWS DynamoDB.

Inflearn. 재고시스템으로 알아보는 동시성이슈 해결 방법

Pessimistic Locking example over MySQL database table row

REST service that allows users to create bank accounts, transfer money between them, view them, and handle concurrent transfers requests safely.

A Jakarta EE banking system featuring EJB Persistent Timers, Container-Managed Transactions & modular EAR architecture. Uses AOP Security Interceptors, IdentityStore & HttpAuthenticationMechanism for RBAC. Implements thread-safe Singleton beans, pessimistic locking & atomic rollbacks via "@ ApplicationException" for high-concurrency data integrity.

Concurrency Control Locking manages concurrent transactions using pessimistic locking, which locks records to prevent conflicts, and skip locking, which skips locked records to improve processing efficiency. These mechanisms ensure data consistency while optimizing performance in high-concurrency scenarios.

🔐 Learning Concurrency

A Spring boot application, showcasing different locks that can be implemented in a Ticketmaster clone.

A production-grade Fintech Backend Simulation built with Spring Boot 4. Features Stateful Authentication (Redis), ACID Transactions, and Concurrency Control (Pessimistic Locking) to prevent race conditions.

High-integrity financial transaction engine implementing Double-Entry Ledger, ACID compliance, and Pessimistic Locking (SELECT FOR UPDATE) to prevent race conditions. Built with Node.js, TypeScript & Postgres.

Implementando a Reserva de um Quarto de Hotel evitando conflitos com Lock Pessimista

Hibernate’in Pessimistic (Kötümser) ve Optimistic (İyimser) kilitleme stratejilerini Spring Boot tabanlı bir uygulama üzerinde nasıl kullanabileceğimizi gösteren bir örnek uygulamadır.