Sending and listening to custom events between applications

JoonKim — Mon, 27 Oct 2014 01:43:24 GMT

Hello all,

I have question about sending and listening events between applications.

An VAN interal SDN application can register a listener to specific, built-in events which HP VAN provides. For example, an application can register a MessageListener or Sequenced Packet Listerner and get notified when OpenFlow messages or Packet-ins arrive at the controller. The application can implement a callback function to decide how to handle such events. I also see there is a built-in service called TopologyManager, which allows other applications to register a listener and get notified when the topology is recomputed.

Now my question is:

Is it possible to create a custom listener for my own application so that other arbitrary applications can register for that listener and get notified when my application raises a certain event? If it is possible, is there any example source code that I can check out so that I can implement my own?

I want this essentially because I want to make my own service application which other applications can consume by getting notifications from it.

I am currently using HP VAN 2.0.0, and cannot find a useful document that explains or guides me to do this. I skimmed through the 2.3.5's programming guide, but I cannot find something useful either. Please let me know if you have any pointers or guidance.

Thank you in advance!

Thanks,

Joon Kim

topic Sending and listening to custom events between applications in Software Defined Networking

Sending and listening to custom events between applications