Type-Safe Event Bus (In Progress)

A learning project where I build a simple event-driven system in Java from scratch.

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Current Progress

-- ✔ Manual event publishing and listeners implemented

• ✔ EventBus introduced for automatic listener management
• ✔ Listeners (WelcomeEmailListener, AnalyticsListener) registered dynamically
• ✔ UserService fully decoupled from listeners
• ✔ EventBus refactored to be type-safe and support multiple event types
• ✔ Added a second event (UserDeletedEvent) and verified multi-event handling
• ✔ Each event type triggers its respective listeners correctly
• ✔ Application successfully tested end-to-end

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Next Steps

🚧 Add asynchronous event dispatching using ExecutorService
🚧 Introduce a global event logger to track all published events
🚧 Write unit tests for EventBus and individual listeners
🚧 Add error handling for failed or unregistered listeners

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Goal

Build a type-safe, generic event bus similar to Spring’s ApplicationEventPublisher or Guava EventBus, capable of handling multiple event types and listeners dynamically.