Improve stereotypes support

docs/src/main/asciidoc/cdi-integration.adoc

@@ -478,6 +478,28 @@ QualifierRegistrarBuildItem addQualifiers() {
 }
 ----
 
+== Use Case - Additional Stereotypes
+
+It is sometimes useful to register an existing annotation that is not annotated with `@javax.enterprise.inject.Stereotype` as a CDI stereotype.
+This is similar to what CDI achieves through `BeforeBeanDiscovery#addStereotype()`.
+We are going to use `StereotypeRegistrarBuildItem` to get it done.
+
+.`StereotypeRegistrarBuildItem` Example
+[source,java]
+----
+@BuildStep
+StereotypeRegistrarBuildItem addStereotypes() {
+    return new StereotypeRegistrarBuildItem(new StereotypeRegistrar() {
+        @Override
+        public Set<DotName> getAdditionalStereotypes() {
+            return Collections.singleton(DotName.createSimple(NotAStereotype.class.getName()));
+        }
+    });
+}
+----
+
+If the newly registered stereotype annotation doesn't have the appropriate meta-annotations, such as scope or interceptor bindings, use an <<annotations_transformer_build_item,annotation transformation>> to add them.
+
 [[injection_point_transformation]]
 == Use Case - Injection Point Transformation
 

extensions/arc/deployment/src/main/java/io/quarkus/arc/deployment/AdditionalStereotypeBuildItem.java

@@ -9,8 +9,13 @@
 import io.quarkus.builder.item.MultiBuildItem;
 
 /**
- * A map of additional stereotype classes to their instances that we want to process.
+ * A map of additional annotation types (that have the same meaning as the {@code @Stereotype} meta-annotation)
+ * to their occurences on other annotations (that become custom stereotypes).
+ *
+ * @deprecated use {@link StereotypeRegistrarBuildItem};
+ *             this class will be removed at some time after Quarkus 3.0
  */
+@Deprecated
 public final class AdditionalStereotypeBuildItem extends MultiBuildItem {
 
     private final Map<DotName, Collection<AnnotationInstance>> stereotypes;

extensions/arc/deployment/src/main/java/io/quarkus/arc/deployment/ArcProcessor.java

@@ -73,6 +73,7 @@
 import io.quarkus.arc.processor.ReflectionRegistration;
 import io.quarkus.arc.processor.ResourceOutput;
 import io.quarkus.arc.processor.StereotypeInfo;
+import io.quarkus.arc.processor.StereotypeRegistrar;
 import io.quarkus.arc.processor.Transformation;
 import io.quarkus.arc.processor.Types;
 import io.quarkus.arc.runtime.AdditionalBean;
@@ -156,6 +157,25 @@ AdditionalBeanBuildItem quarkusApplication(CombinedIndexBuildItem combinedIndex)
                 .build();
     }
 
+    @BuildStep
+    StereotypeRegistrarBuildItem convertLegacyAdditionalStereotypes(List<AdditionalStereotypeBuildItem> buildItems) {
+        return new StereotypeRegistrarBuildItem(new StereotypeRegistrar() {
+            @Override
+            public Set<DotName> getAdditionalStereotypes() {
+                Set<DotName> result = new HashSet<>();
+                for (AdditionalStereotypeBuildItem buildItem : buildItems) {
+                    result.addAll(buildItem.getStereotypes()
+                            .values()
+                            .stream()
+                            .flatMap(Collection::stream)
+                            .map(AnnotationInstance::name)
+                            .collect(Collectors.toSet()));
+                }
+                return result;
+            }
+        });
+    }
+
     // PHASE 1 - build BeanProcessor
     @BuildStep
     public ContextRegistrationPhaseBuildItem initialize(
@@ -169,7 +189,7 @@ public ContextRegistrationPhaseBuildItem initialize(
             List<ObserverTransformerBuildItem> observerTransformers,
             List<InterceptorBindingRegistrarBuildItem> interceptorBindingRegistrars,
             List<QualifierRegistrarBuildItem> qualifierRegistrars,
-            List<AdditionalStereotypeBuildItem> additionalStereotypeBuildItems,
+            List<StereotypeRegistrarBuildItem> stereotypeRegistrars,
             List<ApplicationClassPredicateBuildItem> applicationClassPredicates,
             List<AdditionalBeanBuildItem> additionalBeans,
             List<ResourceAnnotationBuildItem> resourceAnnotations,
@@ -253,11 +273,6 @@ public void transform(TransformationContext transformationContext) {
                 .map((s) -> new BeanDefiningAnnotation(s.getName(), s.getDefaultScope())).collect(Collectors.toList());
         beanDefiningAnnotations.add(new BeanDefiningAnnotation(ADDITIONAL_BEAN, null));
         builder.setAdditionalBeanDefiningAnnotations(beanDefiningAnnotations);
-        final Map<DotName, Collection<AnnotationInstance>> additionalStereotypes = new HashMap<>();
-        for (final AdditionalStereotypeBuildItem item : additionalStereotypeBuildItems) {
-            additionalStereotypes.putAll(item.getStereotypes());
-        }
-        builder.setAdditionalStereotypes(additionalStereotypes);
         builder.addResourceAnnotations(
                 resourceAnnotations.stream().map(ResourceAnnotationBuildItem::getName).collect(Collectors.toList()));
         // register all annotation transformers
@@ -280,6 +295,10 @@ public void transform(TransformationContext transformationContext) {
         for (QualifierRegistrarBuildItem registrar : qualifierRegistrars) {
             builder.addQualifierRegistrar(registrar.getQualifierRegistrar());
         }
+        // register additional stereotypes
+        for (StereotypeRegistrarBuildItem registrar : stereotypeRegistrars) {
+            builder.addStereotypeRegistrar(registrar.getStereotypeRegistrar());
+        }
         builder.setRemoveUnusedBeans(arcConfig.shouldEnableBeanRemoval());
         if (arcConfig.shouldOnlyKeepAppBeans()) {
             builder.addRemovalExclusion(new AbstractCompositeApplicationClassesPredicate<BeanInfo>(

extensions/arc/deployment/src/main/java/io/quarkus/arc/deployment/AutoProducerMethodsProcessor.java

@@ -3,7 +3,7 @@
 import static io.quarkus.arc.processor.Annotations.contains;
 import static io.quarkus.arc.processor.Annotations.containsAny;
 
-import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -32,20 +32,20 @@ public class AutoProducerMethodsProcessor {
     @BuildStep
     void annotationTransformer(ArcConfig config, BeanArchiveIndexBuildItem beanArchiveIndex,
             CustomScopeAnnotationsBuildItem scopes,
-            List<AdditionalStereotypeBuildItem> additionalStereotypes,
+            List<StereotypeRegistrarBuildItem> stereotypeRegistrars,
             BuildProducer<AnnotationsTransformerBuildItem> annotationsTransformer) throws Exception {
         if (!config.autoProducerMethods) {
             return;
         }
-        List<DotName> qualifiersAndStereotypes = new ArrayList<>();
+        Set<DotName> qualifiersAndStereotypes = new HashSet<>();
         for (AnnotationInstance qualifier : beanArchiveIndex.getIndex().getAnnotations(DotNames.QUALIFIER)) {
             qualifiersAndStereotypes.add(qualifier.target().asClass().name());
         }
-        for (AnnotationInstance qualifier : beanArchiveIndex.getIndex().getAnnotations(DotNames.STEREOTYPE)) {
-            qualifiersAndStereotypes.add(qualifier.target().asClass().name());
+        for (AnnotationInstance stereotype : beanArchiveIndex.getIndex().getAnnotations(DotNames.STEREOTYPE)) {
+            qualifiersAndStereotypes.add(stereotype.target().asClass().name());
         }
-        for (AdditionalStereotypeBuildItem additionalStereotype : additionalStereotypes) {
-            qualifiersAndStereotypes.addAll(additionalStereotype.getStereotypes().keySet());
+        for (StereotypeRegistrarBuildItem stereotypeRegistrar : stereotypeRegistrars) {
+            qualifiersAndStereotypes.addAll(stereotypeRegistrar.getStereotypeRegistrar().getAdditionalStereotypes());
         }
         LOGGER.debugf("Add missing @Produces to methods annotated with %s", qualifiersAndStereotypes);
         annotationsTransformer.produce(new AnnotationsTransformerBuildItem(new AnnotationsTransformer() {

extensions/arc/deployment/src/main/java/io/quarkus/arc/deployment/StereotypeRegistrarBuildItem.java

@@ -0,0 +1,21 @@
+package io.quarkus.arc.deployment;
+
+import io.quarkus.arc.processor.StereotypeRegistrar;
+import io.quarkus.builder.item.MultiBuildItem;
+
+/**
+ * Makes it possible to register annotations that should be considered stereotypes but are not annotated with
+ * {@code javax.enterprise.inject.Stereotype}.
+ */
+public final class StereotypeRegistrarBuildItem extends MultiBuildItem {
+
+    private final StereotypeRegistrar registrar;
+
+    public StereotypeRegistrarBuildItem(StereotypeRegistrar registrar) {
+        this.registrar = registrar;
+    }
+
+    public StereotypeRegistrar getStereotypeRegistrar() {
+        return registrar;
+    }
+}

extensions/spring-di/deployment/src/main/java/io/quarkus/spring/di/deployment/SpringDIProcessor.java

@@ -27,21 +27,22 @@
 import org.jboss.jandex.MethodParameterInfo;
 import org.jboss.jandex.Type;
 
-import io.quarkus.arc.deployment.AdditionalStereotypeBuildItem;
 import io.quarkus.arc.deployment.AnnotationsTransformerBuildItem;
 import io.quarkus.arc.deployment.BeanArchiveIndexBuildItem;
+import io.quarkus.arc.deployment.StereotypeRegistrarBuildItem;
 import io.quarkus.arc.processor.BuiltinScope;
 import io.quarkus.arc.processor.DotNames;
+import io.quarkus.arc.processor.StereotypeRegistrar;
 import io.quarkus.arc.processor.Transformation;
 import io.quarkus.deployment.Feature;
 import io.quarkus.deployment.annotations.BuildProducer;
 import io.quarkus.deployment.annotations.BuildStep;
 import io.quarkus.deployment.builditem.FeatureBuildItem;
 
-/*
- * A simple processor that maps annotations Spring DI annotation to CDI annotation
+/**
+ * A simple processor that maps Spring DI annotations to CDI annotations.
  * Arc's handling of annotation mapping (by creating an extra abstraction layer on top of the Jandex index)
- * suits this sort of handling perfectly
+ * suits this sort of handling perfectly.
  */
 public class SpringDIProcessor {
 
@@ -50,11 +51,10 @@ public class SpringDIProcessor {
     static final DotName SPRING_COMPONENT = DotName.createSimple("org.springframework.stereotype.Component");
     static final DotName SPRING_SERVICE = DotName.createSimple("org.springframework.stereotype.Service");
     static final DotName SPRING_REPOSITORY = DotName.createSimple("org.springframework.stereotype.Repository");
-    private static final Set<DotName> SPRING_STEREOTYPE_ANNOTATIONS = Arrays.stream(new DotName[] {
+    private static final Set<DotName> SPRING_STEREOTYPE_ANNOTATIONS = Set.of(
             SPRING_COMPONENT,
             SPRING_SERVICE,
-            SPRING_REPOSITORY,
-    }).collect(Collectors.toSet());
+            SPRING_REPOSITORY);
 
     private static final DotName CONFIGURATION_ANNOTATION = DotName
             .createSimple("org.springframework.context.annotation.Configuration");
@@ -120,18 +120,24 @@ SpringBeanNameToDotNameBuildItem createBeanNamesMap(BeanArchiveIndexBuildItem be
     @BuildStep
     AnnotationsTransformerBuildItem beanTransformer(
             final BeanArchiveIndexBuildItem beanArchiveIndexBuildItem,
-            final BuildProducer<AdditionalStereotypeBuildItem> additionalStereotypeBuildItemBuildProducer) {
+            final BuildProducer<StereotypeRegistrarBuildItem> stereotypeRegistrarProducer) {
         final IndexView index = beanArchiveIndexBuildItem.getIndex();
         final Map<DotName, Set<DotName>> stereotypeScopes = getStereotypeScopes(index);
-        final Map<DotName, Collection<AnnotationInstance>> instances = new HashMap<>();
+        final Set<DotName> stereotypeAnnotations = new HashSet<>();
         for (final DotName name : stereotypeScopes.keySet()) {
-            instances.put(name, index.getAnnotations(name)
+            stereotypeAnnotations.addAll(index.getAnnotations(name)
                     .stream()
                     .filter(it -> it.target().kind() == AnnotationTarget.Kind.CLASS
                             && it.target().asClass().isAnnotation())
+                    .map(AnnotationInstance::name)
                     .collect(Collectors.toSet()));
         }
-        additionalStereotypeBuildItemBuildProducer.produce(new AdditionalStereotypeBuildItem(instances));
+        stereotypeRegistrarProducer.produce(new StereotypeRegistrarBuildItem(new StereotypeRegistrar() {
+            @Override
+            public Set<DotName> getAdditionalStereotypes() {
+                return stereotypeAnnotations;
+            }
+        }));
         return new AnnotationsTransformerBuildItem(context -> {
             final Collection<AnnotationInstance> annotations = context.getAnnotations();
             if (annotations.isEmpty()) {

independent-projects/arc/processor/src/main/java/io/quarkus/arc/processor/BeanConfigurator.java

@@ -43,6 +43,30 @@ public void done() {
             if (implClass == null) {
                 throw new IllegalStateException("Unable to find the bean class in the index: " + implClazz);
             }
+
+            ScopeInfo scope = this.scope;
+            if (scope == null) {
+                scope = Beans.initStereotypeScope(stereotypes, implClass, beanDeployment);
+            }
+            if (scope == null) {
+                scope = BuiltinScope.DEPENDENT.getInfo();
+            }
+
+            String name = this.name;
+            if (name == null) {
+                name = Beans.initStereotypeName(stereotypes, implClass);
+            }
+
+            Boolean alternative = this.alternative;
+            if (alternative == null) {
+                alternative = Beans.initStereotypeAlternative(stereotypes);
+            }
+
+            Integer priority = this.priority;
+            if (priority == null) {
+                priority = Beans.initStereotypeAlternativePriority(stereotypes);
+            }
+
             beanConsumer.accept(new BeanInfo.Builder()
                     .implClazz(implClass)
                     .providerType(providerType)
@@ -52,6 +76,7 @@ public void done() {
                     .qualifiers(qualifiers)
                     .alternative(alternative)
                     .priority(priority)
+                    .stereotypes(stereotypes)
                     .name(name)
                     .creator(creatorConsumer)
                     .destroyer(destroyerConsumer)

independent-projects/arc/processor/src/main/java/io/quarkus/arc/processor/BeanConfiguratorBase.java

@@ -9,8 +9,10 @@
 import io.quarkus.gizmo.ResultHandle;
 import java.lang.annotation.Annotation;
 import java.lang.annotation.Inherited;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Consumer;
@@ -32,7 +34,8 @@ public abstract class BeanConfiguratorBase<THIS extends BeanConfiguratorBase<THI
     protected final Set<Type> types;
     protected final Set<AnnotationInstance> qualifiers;
     protected ScopeInfo scope;
-    protected boolean alternative;
+    protected Boolean alternative;
+    protected final List<StereotypeInfo> stereotypes;
     protected String name;
     protected Consumer<MethodCreator> creatorConsumer;
     protected Consumer<MethodCreator> destroyerConsumer;
@@ -47,7 +50,7 @@ protected BeanConfiguratorBase(DotName implClazz) {
         this.implClazz = implClazz;
         this.types = new HashSet<>();
         this.qualifiers = new HashSet<>();
-        this.scope = BuiltinScope.DEPENDENT.getInfo();
+        this.stereotypes = new ArrayList<>();
         this.removable = true;
     }
 
@@ -68,6 +71,8 @@ public THIS read(BeanConfiguratorBase<?, ?> base) {
         scope(base.scope);
         alternative = base.alternative;
         priority = base.priority;
+        stereotypes.clear();
+        stereotypes.addAll(base.stereotypes);
         name(base.name);
         creator(base.creatorConsumer);
         destroyer(base.destroyerConsumer);
@@ -197,6 +202,16 @@ public THIS priority(int value) {
         return self();
     }
 
+    public THIS addStereotype(StereotypeInfo stereotype) {
+        this.stereotypes.add(stereotype);
+        return self();
+    }
+
+    public THIS stereotypes(StereotypeInfo... stereotypes) {
+        Collections.addAll(this.stereotypes, stereotypes);
+        return self();
+    }
+
     /**
      * The provider type is the "real" type of the bean instance created via
      * {@link InjectableReferenceProvider#get(CreationalContext)}.