What does the Action ADD in fabric8 watch API mean? My initial understanding of it is to add a resource, but I tested it and a bunch of ADD Actions were triggered.
What does the Action ADD in kubernetes-fabric8 watch API mean?
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Yes, Fabric8 Kubernetes Client's
WatchEvent
basically maps to Kubernetespkg/watch/json
. SoEventType
in it is basically aString
value which is sent by Kubernetes API server as a response and you need to handle what you need to do on the type of event. It can have these values:ADDED
,DELETED
,MODIFIED
,BOOKMARK
,ERROR
. When you start the watch without anyresourceVersion
as a parameter, it would just start with resource version set to0
. It starts watch from the beginning and you seeADD
actions being triggered for the resources which are already in the cluster. I think you must have seen this behavior when you usekubectl
as well:If you go ahead and create some more resources, you should be able to see more
ADDED
actions being triggered. On modifying, you should be seeingMODIFIED
events as well. These are sent by Kubernetes APIServer and Fabric8 Kubernetes Client just deserializes them into Java objects.So, while watching I would suggest you to handle all the cases depending upon your situation inside the
eventReceived()
call like this:I hope this clears your understanding of Fabric8's WatchEvent types.