@AllowConcurrentEvents should be used

[yososs]

When parallel performance comparison, should you use @AllowConcurrentEvents annotation for Guava?

[bennidi]

@AllowConcurrentEvents configures an event handler as eligible for multi-threaded invocation. This is the same as using @Handler(dispatch = Invoke.asynchronously) with MBassador. It's a different test scenario which is currently not implemented.

[yososs]

@handler(dispatch = Invoke.asynchronously)

Is not it the same as using Guava's AsyncEventBus?

AsyncEventBus -> Async Dispatch
EventBus -> Sync Dispatch

@subscribe @AllowConcurrentEvents -> Allow Concurrent Subscribe method
@subscribe -> Disallow Concurrent Subscribe method(Synchronize using synchronized block)

[bennidi]

No. You have to draw a distinction between asynchronous publication (fire and forget) when publishing an event. And the invocation of handlers for a specific event publication (which can be synchronous or asynchronous).