Chapter 7. Events
We're now going to find out about events within CDI, such as how they are fired, how we listen for new events, what we can use as an event payload, and how we can narrow what events we can listen to and fire. All of these we will discover while staying within the boundaries of typesafe Java, making our runtime less error-prone.
Events may be produced and consumed by beans of our application, but there is absolutely no coupling between the bean producing an event and the one consuming it. This allows our beans to interact without any coupling or compile-time dependencies between them.
What is a payload?
The payload of an event, the event object, carries any necessary state from the producer to the consumer and is nothing but an instance ...
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