番石榴事件总线内存限制

Question

I implemented a singleton EventBus with one subscriber. My application has many producer (any request can be a producer).

@Bean
public EventBus eventBus() {
    EventBus eventBus = new EventBus();
    eventBus.register(new MyEventHandler());
    return eventBus;
}

I could not find how to set a limit on number of events for the EventBus (how to set a memory limit for the EventBus ) and also what happens if the number of produced events is greater than EventBus capacity.

I would like EventBus to throw an exception to log the failure.

Answer 1

No need to set a memory limit. It's safe, because EventBus works stateless .

In a single thread, the EventBus cleans up the event-queue every time once EventBus.post() completes, so it's safe in a single thread.

In multiple-thread, EventBus uses independent event-queue for each thread.