Question 1

How does EventBus compare to using native Go channels for event handling?

Accepted Answer

EventBus provides a higher-level pub-sub abstraction with topic management and async support, ideal for decoupled components. Native Go channels are lower-level and better for direct goroutine communication, requiring more manual coordination.

Question 2

How to handle panics in EventBus callbacks?

Accepted Answer

EventBus does not catch panics in handlers. You should wrap callback functions in recover() to prevent application crashes, as error handling is left to the developer.

Question 3

Can EventBus scale across multiple servers in a distributed system?

Accepted Answer

It supports cross-process events via RPC, but this is point-to-point and lacks clustering or load balancing. For large-scale distribution, dedicated message brokers are more suitable.

Question 4

What's the performance impact of transactional async callbacks in EventBus?

Accepted Answer

Transactional async callbacks run serially, which can bottleneck performance with high event volumes. Use non-transactional for concurrency, but ensure thread safety in handlers.

Question 5

How to unsubscribe all handlers for a topic in EventBus?

Accepted Answer

EventBus requires unsubscribing each handler individually; there's no built-in method to clear all subscriptions for a topic, so manual tracking is necessary.

Question 6

EventBus vs RabbitMQ for Go microservices?

Accepted Answer

EventBus is a lightweight library for in-process or simple cross-process events, best for small to medium apps. RabbitMQ is a full-featured broker with persistence, complex routing, and better scalability for production systems.

EventBus

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