Event Bus vs Global State

Developers should learn and use an Event Bus when building applications that require decoupled communication, such as microservices, frontend frameworks, or complex systems with multiple interacting modules meets developers should use global state when building applications with complex data flows, such as single-page applications (spas) or large-scale web apps, where multiple components need access to shared data like user sessions, shopping carts, or real-time updates. Here's our take.

Event Bus

Nice Pick

Developers should learn and use an Event Bus when building applications that require decoupled communication, such as microservices, frontend frameworks, or complex systems with multiple interacting modules

Pros

• It is particularly useful for scenarios like real-time updates, logging, error handling, or coordinating state changes across components, as it simplifies event management and reduces direct component dependencies
• Related to: publish-subscribe-pattern, message-queue

Cons

• Specific tradeoffs depend on your use case

Global State

Developers should use global state when building applications with complex data flows, such as single-page applications (SPAs) or large-scale web apps, where multiple components need access to shared data like user sessions, shopping carts, or real-time updates

Pros

• It simplifies state management by avoiding prop drilling and making state changes predictable, which is crucial for debugging and maintaining scalable codebases
• Related to: redux, context-api

Cons

• Specific tradeoffs depend on your use case

The Verdict

Use Event Bus if: You want it is particularly useful for scenarios like real-time updates, logging, error handling, or coordinating state changes across components, as it simplifies event management and reduces direct component dependencies and can live with specific tradeoffs depend on your use case.

Use Global State if: You prioritize it simplifies state management by avoiding prop drilling and making state changes predictable, which is crucial for debugging and maintaining scalable codebases over what Event Bus offers.

The Bottom Line

Event Bus wins

Developers should learn and use an Event Bus when building applications that require decoupled communication, such as microservices, frontend frameworks, or complex systems with multiple interacting modules