feat: expose logic to determine whether a kube dependent resource uses SSA or not

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/ConfigurationService.java

@@ -23,6 +23,9 @@
 import io.javaoperatorsdk.operator.api.reconciler.Reconciler;
 import io.javaoperatorsdk.operator.api.reconciler.dependent.DependentResourceFactory;
 import io.javaoperatorsdk.operator.processing.dependent.kubernetes.KubernetesDependent;
+import io.javaoperatorsdk.operator.processing.dependent.kubernetes.KubernetesDependentResource;
+import io.javaoperatorsdk.operator.processing.dependent.kubernetes.KubernetesDependentResourceConfig;
+import io.javaoperatorsdk.operator.processing.dependent.kubernetes.ResourceUpdaterMatcher;
 import io.javaoperatorsdk.operator.processing.dependent.workflow.ManagedWorkflowFactory;
 
 /** An interface from which to retrieve configuration information. */
@@ -358,6 +361,32 @@ default boolean ssaBasedCreateUpdateMatchForDependentResources() {
     return true;
   }
 
+  /**
+   * This is mostly useful as an integration point for downstream projects to be able to reuse the
+   * logic used to determine whether a given {@link KubernetesDependentResource} should use SSA or
+   * not.
+   *
+   * @param dependentResource the {@link KubernetesDependentResource} under consideration
+   * @return {@code true} if SSA should be used for
+   * @param <R> the dependent resource type
+   * @param <P> the primary resource type
+   * @since 4.9.4
+   */
+  default <R extends HasMetadata, P extends HasMetadata> boolean shouldUseSSA(
+      KubernetesDependentResource<R, P> dependentResource) {
+    if (dependentResource instanceof ResourceUpdaterMatcher) {
+      return false;
+    }
+    Optional<Boolean> useSSAConfig = dependentResource.configuration()
+        .flatMap(KubernetesDependentResourceConfig::useSSA);
+    // don't use SSA for certain resources by default, only if explicitly overriden
+    if (useSSAConfig.isEmpty()
+        && defaultNonSSAResource().contains(dependentResource.resourceType())) {
+      return false;
+    }
+    return useSSAConfig.orElse(ssaBasedCreateUpdateMatchForDependentResources());
+  }
+
   /**
    * Returns the set of default resources for which Server-Side Apply (SSA) will not be used, even
    * if it is the default behavior for dependent resources as specified by

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/kubernetes/GenericKubernetesDependentResource.java

@@ -8,7 +8,7 @@
 public class GenericKubernetesDependentResource<P extends HasMetadata>
     extends KubernetesDependentResource<GenericKubernetesResource, P> {
 
-  private GroupVersionKind groupVersionKind;
+  private final GroupVersionKind groupVersionKind;
 
   public GenericKubernetesDependentResource(GroupVersionKind groupVersionKind) {
     super(GenericKubernetesResource.class);
@@ -19,6 +19,7 @@ protected InformerConfiguration.InformerConfigurationBuilder<GenericKubernetesRe
     return InformerConfiguration.from(groupVersionKind);
   }
 
+  @SuppressWarnings("unused")
   public GroupVersionKind getGroupVersionKind() {
     return groupVersionKind;
   }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/kubernetes/KubernetesDependentResource.java

@@ -38,15 +38,13 @@ public abstract class KubernetesDependentResource<R extends HasMetadata, P exten
   private final ResourceUpdaterMatcher<R> updaterMatcher;
   private final boolean garbageCollected = this instanceof GarbageCollected;
   private KubernetesDependentResourceConfig<R> kubernetesDependentResourceConfig;
-
-  private final boolean usingCustomResourceUpdateMatcher;
+  private volatile Boolean useSSA;
 
   @SuppressWarnings("unchecked")
   public KubernetesDependentResource(Class<R> resourceType) {
     super(resourceType);
 
-    usingCustomResourceUpdateMatcher = this instanceof ResourceUpdaterMatcher;
-    updaterMatcher = usingCustomResourceUpdateMatcher
+    updaterMatcher = this instanceof ResourceUpdaterMatcher
         ? (ResourceUpdaterMatcher<R>) this
         : GenericResourceUpdaterMatcher.updaterMatcherFor(resourceType);
   }
@@ -194,18 +192,10 @@ protected void addMetadata(boolean forMatch, R actualResource, final R target, P
   }
 
   protected boolean useSSA(Context<P> context) {
-    if (usingCustomResourceUpdateMatcher) {
-      return false;
-    }
-    Optional<Boolean> useSSAConfig =
-        configuration().flatMap(KubernetesDependentResourceConfig::useSSA);
-    var configService = context.getControllerConfiguration().getConfigurationService();
-    // don't use SSA for certain resources by default, only if explicitly overriden
-    if (useSSAConfig.isEmpty() && configService.defaultNonSSAResource().contains(resourceType())) {
-      return false;
+    if (useSSA == null) {
+      useSSA = context.getControllerConfiguration().getConfigurationService().shouldUseSSA(this);
     }
-    return useSSAConfig.orElse(context.getControllerConfiguration().getConfigurationService()
-        .ssaBasedCreateUpdateMatchForDependentResources());
+    return useSSA;
   }
 
   private boolean usePreviousAnnotation(Context<P> context) {