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Add callback listener section to README

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Kai S. K. Engelbart 2021-11-24 10:45:58 +01:00
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@ -94,6 +94,18 @@ private void onSimpleEvent() {
Make sure that you **do not** both declare a parameter and specify the event type in the annotation, as this would be ambiguous. Make sure that you **do not** both declare a parameter and specify the event type in the annotation, as this would be ambiguous.
## Callback listeners
While defining event handlers as annotated methods is rather simple and readable, sometimes a more flexible approach is required.
For this reason, there are callback event handlers that allow the registration of an "inline" event listener consisting of just one handler in the form of a consumer:
```java
EventBus.getInstance().registerListener(SimpleEvent.class, e -> System.out.println("Received " + e));
```
The event type has to be defined explicitly, with the priority and polymorphism parameters being optional.
If you intend to remove the listener later, remember to keep a reference to it, as you would have to clear the entire event bus if you didn't.
## Listener-Level Properties ## Listener-Level Properties
When defining a dedicated event listener that, for example, performs pre- or post-processing, all event handlers will probably have the same non-standard priority. When defining a dedicated event listener that, for example, performs pre- or post-processing, all event handlers will probably have the same non-standard priority.