The WSO2 SOA Enablement Server application fires an event using the static method fireEvent(org.systinet.monitoring.Event) in org.systinet.monitoring.EventManager. EventManager gets a list of registered instances of org.systinet.monitoring.EventListener for events of the given type and calls its handle (event) method. Event Listeners are processed in the order specified in the configuration. A graphic representation is shown in Figure 1.

Figure 1. Event Monitoring Sequence