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How can i store customized data and notify data changed to registered application in ODL?

Good to see you.

I`m newbie in Opendaylight.

I try to develop applications.

I know about other SDN controller, NOX, Floodlight ..., But i don`t know about ODL deeply.


I wanna make customized data structure which is used for storing data globally. The customized data is accessed in anywhere(any applications). And, when an element in customized data is changed, registered applications are received data change notification.

How can i do in ODL?

I found some solution about this.

Do i need to know about "Yang", "Data Broker" ??! (Have to know about MD-sal??!)

Though i try to get this, I don`t understand properly.

If you guys have solution about my question, please give me a advice