Listening for FlowRule Events.

[Abhishek Dwaraki]

Hey folks,
I am trying to figure out how to listen for FlowRule related events, particularly events that occur due to success or failure to program flow rules into the data path. So far, I have been able to trace the control flow down to the Pipeliner code, where I can see an ObjectiveError.FLOWINSTALLATIONFAILED message being added, but how do I listen for this message?

Could someone briefly explain how to listen for and process events in the ONOS framework?

Regards,
Abhishek.

[Jonathan Hart]

That depends if you are installing FlowRules or FlowObjectives.

If you're installing FlowRules and want to listen to notifications, the FlowRuleService has an addListener method that allows you to register a listener.

If you're installing FlowObjectives, when you build the FlowObjective you can use the overloaded Builder.add(ObjectiveContext) method to pass in an ObjectiveContext with the flow objective. The ObjectiveContext is a callback that will be called either on the success or failure of the objective installation.

Thanks,

Jono

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