I am trying to implement a simple event publishing solution but fear I am barking up the wrong tree. I am using version 6.2.3. Basically I want to send emails when certain events take place (password change or reset) and thought publishing an event to a listener that subsequently sends the email would make sense. However the code I currently have is based on the Spring "ApplicationEventPublisher" and a listener on the Spring "@EventListener". In addition to this my listener is based under ./src/main/groovy as a Spring Component. Needless to say this is not working. The publish code runs but the Listener is either not running or at least not listening for an event. I saw the following docs - https://async.grails.org/latest/guide/index.html#notifying Does anyone have a simple example/pointers how to get this working? Basically I want to have a service that will Publish an Event after-which a generic Email Service can listen and act on this and take care of sending. The user wont notice any delay etc Much appreciated if someone can help me out

event publishing is a reasonable approach to this. I'd use the built-in spring publishing since it can already support async publishing. We wrapper our event publisher in a service to match the grails conventions, something like this:

class EventService implements ApplicationEventPublisherAware {
    private ApplicationEventPublisher publisher
     
    void publish(MyEventClass applicationEvent) {
        if (publisher) {
            publisher.publishEvent(applicationEvent)
        }
    }

    @Override
    void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
        this.publisher = applicationEventPublisher
    }
}

As for subscribing to events, you add a method on a bean and annotate it with either

@EventListener

or

@TransactionalEventListener

. You'll want to use TransactionEventListener with

@Async

to asynchronously trigger a response.

@Async
@TransactionalEventListener(phase = TransactionPhase.AFTER_COMMIT, condition = '#event.myEnum == T(com.example.MyEnum).CREATE')
void myResponseMethod(MyEventClass event)

Note that the syntax for the event listener uses spring el

👍