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Creating your first Trigger

Creating your first Trigger

kn trigger create cloudevents-player --sink cloudevents-player

//TODO

Expected Output 

Trigger 'cloudevents-player' successfully created in namespace 'default'.

What CloudEvents is my Trigger listening for?

Since we didn't specify a --filter in our kn command, our Trigger is listening for any CloudEvents coming into the Broker.

Now, when we go back to the CloudEvents Player and send an Event, we see that CloudEvents are both sent and received by the CloudEvents Player:

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What if I want to filter on CloudEvent attributes?

First, delete your existing Trigger: 

  kn trigger delete cloudevents-player
Now let's add a Trigger that listens for a certain CloudEvent Type 
  kn trigger create cloudevents-player --sink cloudevents-player --filter type=some-type

If you send a CloudEvent with type "some-type," it will be reflected in the CloudEvents Player UI. Any other types will be ignored by the Trigger.

You can filter on any aspect of the CloudEvent you would like to.

Some people call this "Event-Driven Architecture" which can be used to create your own "Functions as a Service" on Kubernetes 🎉 🌮 🔥