1. Calix ONOS Contribution
Native applications are written in Java
External applications use the REST API
May be written in any language.
Not possible to receive notifications
Native apps are
written in Java
No notifications from ONOS,
so external apps serve limited use cases

2. Calix ONOS Contribution
Problem statement: Currently there is no notifications infrastructure for non-native, non-Java apps, so external apps serve limited use cases Solution: Add a Kafka based notification infrastructure for non-Java apps
Release demo here
Kafka integration allows existing and new applications written in virtually any language to integrate with the ONOS SDN controller via Kafka clients.
Apache Kafka