chore: support KubernetesInformers annotation on bean constructor

Author: yue9944882

spring/src/main/java/io/kubernetes/client/spring/extended/controller/KubernetesInformerFactoryProcessor.java

@@ -21,8 +21,11 @@
 import io.kubernetes.client.spring.extended.controller.annotation.KubernetesInformer;
 import io.kubernetes.client.spring.extended.controller.annotation.KubernetesInformers;
 import io.kubernetes.client.util.generic.GenericKubernetesApi;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.BeanFactory;
+import org.springframework.beans.factory.BeanFactoryAware;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
@@ -41,17 +44,18 @@
  * injects informers to spring context with the underlying constructing process hidden from users.
  */
 public class KubernetesInformerFactoryProcessor
-    implements BeanDefinitionRegistryPostProcessor, Ordered {
+    implements BeanDefinitionRegistryPostProcessor, BeanFactoryAware, Ordered {
+
+  private static final Logger log =
+      LoggerFactory.getLogger(KubernetesInformerFactoryProcessor.class);
 
   public static final int ORDER = 0;
 
   private ConfigurableListableBeanFactory beanFactory;
 
   @Override
   public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
-      throws BeansException {
-    this.beanFactory = beanFactory;
-  }
+      throws BeansException {}
 
   @Override
   public int getOrder() {
@@ -65,15 +69,22 @@ public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry)
       return;
     }
     for (String name : registry.getBeanDefinitionNames()) {
+      KubernetesInformers kubernetesInformers = null;
       Class<?> cls = ((BeanFactory) registry).getType(name);
       if (cls != null) {
-        KubernetesInformers kubernetesInformers =
+        kubernetesInformers =
             AnnotatedElementUtils.getMergedAnnotation(cls, KubernetesInformers.class);
-        if (kubernetesInformers != null && kubernetesInformers.value().length > 0) {
-          for (KubernetesInformer kubernetesInformer : kubernetesInformers.value()) {
-            registerInformer(registry, kubernetesInformer);
-            registerLister(registry, kubernetesInformer);
-          }
+      }
+      if (kubernetesInformers == null) {
+        kubernetesInformers = beanFactory.findAnnotationOnBean(name, KubernetesInformers.class);
+      }
+      if (kubernetesInformers == null) {
+        continue;
+      }
+      if (kubernetesInformers.value().length > 0) {
+        for (KubernetesInformer kubernetesInformer : kubernetesInformers.value()) {
+          registerInformer(registry, kubernetesInformer);
+          registerLister(registry, kubernetesInformer);
         }
       }
     }
@@ -137,4 +148,9 @@ private <T extends KubernetesObject> SharedInformer<T> informer(
             api, type, kubernetesInformer.resyncPeriodMillis(), kubernetesInformer.namespace());
     return sharedIndexInformer;
   }
+
+  @Override
+  public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+    this.beanFactory = (ConfigurableListableBeanFactory) beanFactory;
+  }
 }

spring/src/main/java/io/kubernetes/client/spring/extended/controller/annotation/KubernetesInformers.java

@@ -26,7 +26,7 @@
  * io.kubernetes.client.spring.extended.controller.annotation.KubernetesInformer} onto one bean
  * method.
  */
-@Target({ElementType.TYPE})
+@Target({ElementType.TYPE, ElementType.METHOD})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface KubernetesInformers {
 

spring/src/test/java/io/kubernetes/client/spring/extended/controller/KubernetesInformerCreatorTest.java

@@ -66,10 +66,6 @@ public ApiClient testingApiClient() {
     }
 
     @Bean
-    public TestSharedInformerFactory testSharedInformerFactory() {
-      return new TestSharedInformerFactory();
-    }
-
     @KubernetesInformers({
       @KubernetesInformer(
           apiTypeClass = V1Pod.class,
@@ -86,7 +82,9 @@ public TestSharedInformerFactory testSharedInformerFactory() {
                   apiVersion = "v1",
                   resourcePlural = "configmaps")),
     })
-    static class TestSharedInformerFactory {}
+    public SharedInformerFactory testSharedInformerFactory() {
+      return new SharedInformerFactory();
+    }
   }
 
   @Autowired private SharedInformerFactory informerFactory;