Java EE 8 High Performance

Events

CDI events globally provide an event BUS inside the application. They can be synchronous or asynchronous. To let you have an idea, here is what the code can look like:

@ApplicationScopedpublic class LifecycleManager {    @Inject    private Event<Starting> startingEvent;    public void starting() {        final Starting event = new Starting();        startingEvent.fire(event);        startingEvent.fireAsync(event);    }}

As both types of invocations are exclusive, what we can note here is that these snippets call fire() and fireAsync(). To be able to target all the observers, you need to invoke both. This means that the associated logic will be twice.

Without entering into the details that do not impact our performance, both cases share the same resolution mechanism: ...