io.github.ljnelson.dev5432.configmap.controller

Annotation Type AllDefaultConfigMapsController.AllDefaultConfigMaps

@Documented
 @KubernetesEventSelector
 @Qualifier
 @Retention(value=RUNTIME)
 @Target(value={FIELD,METHOD,PARAMETER,TYPE})
public static @interface AllDefaultConfigMapsController.AllDefaultConfigMaps

A qualifier annotation that itself is qualified with KubernetesEventSelector allowing it to pair relevant producer and observer methods so that certain ConfigMap resources can be observed.

Learning Notes

Note that this annotation is annotated with both Qualifier—making it a CDI qualifier—and KubernetesEventSelector—allowing it to be recognized by the microBean Kubernetes Controller CDI framework.

Because it "is a" KubernetesEventSelector, you apply this annotation to two things:

1. To a bean—most commonly to a producer method—that can be assigned to a reference that can be described by the following type declaration: <X extends Listable<? extends KubernetesResourceList> & VersionWatchable<? extends Closeable, Watcher<? extends HasMetadata>>>. This bean is known as a Kubernetes event selector: it is something whose list() method and watch(W) method will be called to select what Kubernetes events will get delivered to your Kubernetes event observer method. While that type declaration looks complicated, it conveniently describes the return types of most of the methods on KubernetesClient.
2. To an observer method's event parameter whose type is identical to the "primary type" in the matching bean or producer method. For example, given a bean type—usually the return value of a producer method—of NonNamespaceOperation<ConfigMap, ConfigMapList, DoneableConfigMap, Resource<ConfigMap, DoneableConfigMap>> the "primary type" is ConfigMap. This identifies your observer method to the microBean Kubernetes Controller CDI framework and allows it to deliver Kubernetes events to it using the similarly-annotated bean or producer method (described above). An observer method whose event parameter is annotated in this way—together with Added, Modified or Deleted qualifier annotations—constitutes a Kubernetes event observer method.

When you "connect" a Kubernetes event selector with a Kubernetes event observer method using this annotation, then events produced by the Kubernetes event selector will be delivered to the Kubernetes event observer method. If you "connect" a different Kubernetes event selector with a different Kubernetes event observer method using another KubernetesEventSelector-annotated qualifier annotation, then that Kubernetes event selector will be used to deliver Kubernetes events to that Kubernetes event observer method.

See Also:

KubernetesEventSelector