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concurrenthashmap

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Thread-safe Parking Lot System in Java using Singleton with double-checked locking, Strategy pattern for fee and payment logic, and Factory pattern for vehicle creation. AtomicBoolean and synchronized spot-level locking handle concurrent races via a TOCTOU-safe retry loop. Fluent Builder for lot configuration and UUID-based ticket generation.

  • Updated May 12, 2026
  • Java

A concurrent job queue system built in Java w/ Spring Boot, retry logic, configurable worker pools, RESTful API endpoints. Designed as a learning project to explore idiomatic Java concurrency (ExecutorService) and the Producer–Consumer model. Inspired by real job queue systems such as Celery. This is a Java remake of my GoQueue project

  • Updated Jan 28, 2026
  • Java

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