Listeners can be seen as hooks. They wait for a specific event and take a used-defined action if the event occurs.

Figure 24.1. Listeners
The event is specific to the particular listener
| Graph Event Listeners |
| Jobflow Event Listeners |
| JMS Messages Listeners |
| Universal Event Listeners |
| File Event Listeners (remote and local) |
| Task Failure Listeners |
The available actions taken by the listeners are common for all listeners. The action, that can be taken are: