ExtensionEventListener (BlueJ Extensions API)

```
public interface ExtensionEventListener
```
This interface allows an extension to listen for all BlueJ events by using a single listener. Normally, extensions will use the specialised event types and listeners, but in some cases (e.g.) logging or testing extensions this overarching event type will be more appropriate.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void eventOccurred(ExtensionEvent event)
  This method will be called when an event occurs.

- Method Detail
  - eventOccurred
```
void eventOccurred(ExtensionEvent event)
```
    This method will be called when an event occurs. Note that this method is called from the JavaFX (GUI) thread and therefore the extension must return as quickly as possible. If a long operation must be performed the extension should start a Thread.
    
    Parameters:
    
    event - An ExtensionEvent object, typically one of the ExtensionEvent's subclasses.