Introduce AutoAddScopeBuildItem to remove boilerplate necessary when annotation transformers are used to add a scope annotation to a class

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

@@ -0,0 +1,243 @@
+package io.quarkus.arc.deployment;
+
+import java.util.Collection;
+
+import org.jboss.jandex.AnnotationInstance;
+import org.jboss.jandex.ClassInfo;
+import org.jboss.jandex.DotName;
+import org.jboss.jandex.IndexView;
+
+import io.quarkus.arc.processor.Annotations;
+import io.quarkus.arc.processor.BuiltinScope;
+import io.quarkus.arc.processor.DotNames;
+import io.quarkus.builder.item.MultiBuildItem;
+
+/**
+ * This build item can be used to turn a class that is not annotated with a CDI scope annotation into a bean, i.e. the default
+ * scope annotation is added automatically if conditions are met.
+ */
+public final class AutoAddScopeBuildItem extends MultiBuildItem {
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    private final MatchPredicate matchPredicate;
+    private final boolean containerServicesRequired;
+    private final DotName defaultScope;
+    private final boolean unremovable;
+    private final String reason;
+
+    private AutoAddScopeBuildItem(MatchPredicate matchPredicate, boolean containerServicesRequired,
+            DotName defaultScope, boolean unremovable, String reason) {
+        this.matchPredicate = matchPredicate;
+        this.containerServicesRequired = containerServicesRequired;
+        this.defaultScope = defaultScope;
+        this.unremovable = unremovable;
+        this.reason = reason;
+    }
+
+    public boolean isContainerServicesRequired() {
+        return containerServicesRequired;
+    }
+
+    public DotName getDefaultScope() {
+        return defaultScope;
+    }
+
+    public boolean isUnremovable() {
+        return unremovable;
+    }
+
+    public String getReason() {
+        return reason != null ? ": " + reason : "";
+    }
+
+    public boolean test(ClassInfo clazz, Collection<AnnotationInstance> annotations, IndexView index) {
+        return matchPredicate.test(clazz, annotations, index);
+    }
+
+    public interface MatchPredicate {
+
+        /**
+         * @param clazz
+         * @param annotations
+         * @param index
+         * @return {@code true} if the input arguments match the predicate,
+         *         {@code false} otherwise
+         */
+        boolean test(ClassInfo clazz, Collection<AnnotationInstance> annotations, IndexView index);
+
+        default MatchPredicate and(MatchPredicate other) {
+            return new MatchPredicate() {
+                @Override
+                public boolean test(ClassInfo clazz, Collection<AnnotationInstance> annotations, IndexView index) {
+                    return test(clazz, annotations, index) && other.test(clazz, annotations, index);
+                }
+            };
+        }
+
+    }
+
+    public static class Builder {
+
+        private MatchPredicate matchPredicate;
+        private boolean requiresContainerServices;
+        private DotName defaultScope;
+        private boolean unremovable;
+        private String reason;
+
+        private Builder() {
+            this.defaultScope = BuiltinScope.DEPENDENT.getName();
+            this.unremovable = false;
+            this.requiresContainerServices = false;
+        }
+
+        /**
+         * At least one injection point or lifecycle callback must be declared in the class hierarchy. Otherwise, the scope
+         * annotation is not added.
+         * <p>
+         * Note that the detection algorithm is just the best effort. Some inheritance rules defined by the spec are not
+         * followed, e.g. per spec an initializer method is only inherited if not overriden. This method merely scans the
+         * annotations.
+         * 
+         * @return self
+         */
+        public Builder requiresContainerServices() {
+            this.requiresContainerServices = true;
+            return this;
+        }
+
+        /**
+         * The bean will be unremovable.
+         * 
+         * @see ArcConfig#removeUnusedBeans
+         * @return self
+         */
+        public Builder unremovable() {
+            this.unremovable = true;
+            return this;
+        }
+
+        /**
+         * Set a custom predicate.
+         * 
+         * @param predicate
+         * @return self
+         */
+        public Builder match(MatchPredicate predicate) {
+            this.matchPredicate = predicate;
+            return this;
+        }
+
+        /**
+         * The class must be annotated with the given annotation. Otherwise, the scope annotation is not added.
+         * <p>
+         * The final predicate is a short-circuiting logical AND of the previous predicate (if any) and this condition.
+         * 
+         * @param annotationName
+         * @return self
+         */
+        public Builder isAnnotatedWith(DotName annotationName) {
+            return and((clazz, annotations, index) -> Annotations.contains(annotations, annotationName));
+        }
+
+        /**
+         * The class or any of its element must be annotated with the given annotation. Otherwise, the scope annotation is not
+         * added.
+         * <p>
+         * The final predicate is a short-circuiting logical AND of the previous predicate (if any) and this condition.
+         * 
+         * 
+         * @param annotationNames
+         * @return self
+         */
+        public Builder containsAnnotations(DotName... annotationNames) {
+            return and((clazz, annotations, index) -> {
+                for (DotName annotation : annotationNames) {
+                    if (clazz.annotations().containsKey(annotation)) {
+                        return true;
+                    }
+                }
+                return false;
+            });
+        }
+
+        /**
+         * The class must directly or indirectly implement the given interface.
+         * <p>
+         * The final predicate is a short-circuiting logical AND of the previous predicate (if any) and this condition.
+         * 
+         * @param interfaceName
+         * @param index
+         * @return self
+         */
+        public Builder implementsInterface(DotName interfaceName) {
+            return and((clazz, annotations, index) -> {
+                if (clazz.interfaceNames().contains(interfaceName)) {
+                    return true;
+                }
+                DotName superName = clazz.superName();
+                while (superName != null && !superName.equals(DotNames.OBJECT)) {
+                    ClassInfo superClass = index.getClassByName(superName);
+                    if (superClass != null) {
+                        if (superClass.interfaceNames().contains(interfaceName)) {
+                            return true;
+                        }
+                        superName = superClass.superName();
+                    }
+                }
+                return false;
+            });
+        }
+
+        /**
+         * The scope annotation added to the class.
+         * 
+         * @param scopeAnnotationName
+         * @return self
+         */
+        public Builder defaultScope(DotName scopeAnnotationName) {
+            this.defaultScope = scopeAnnotationName;
+            return this;
+        }
+
+        /**
+         * The scope annotation added to the class.
+         * 
+         * @param scope
+         * @return
+         */
+        public Builder defaultScope(BuiltinScope scope) {
+            return defaultScope(scope.getName());
+        }
+
+        /**
+         * Specify an optional reason description that is used in log messages.
+         * 
+         * @param reason
+         * @return the reason why the scope annotation was added
+         */
+        public Builder reason(String reason) {
+            this.reason = reason;
+            return this;
+        }
+
+        private Builder and(MatchPredicate other) {
+            if (matchPredicate == null) {
+                matchPredicate = other;
+            } else {
+                matchPredicate = matchPredicate.and(other);
+            }
+            return this;
+        }
+
+        public AutoAddScopeBuildItem build() {
+            if (matchPredicate == null) {
+                throw new IllegalStateException("A matching predicate must be set!");
+            }
+            return new AutoAddScopeBuildItem(matchPredicate, requiresContainerServices, defaultScope, unremovable, reason);
+        }
+    }
+
+}

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

@@ -0,0 +1,129 @@
+package io.quarkus.arc.deployment;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+import org.jboss.jandex.AnnotationTarget.Kind;
+import org.jboss.jandex.ClassInfo;
+import org.jboss.jandex.DotName;
+import org.jboss.jandex.IndexView;
+import org.jboss.logging.Logger;
+
+import io.quarkus.arc.processor.AnnotationsTransformer;
+import io.quarkus.arc.processor.BeanInfo;
+import io.quarkus.arc.processor.DotNames;
+import io.quarkus.deployment.annotations.BuildProducer;
+import io.quarkus.deployment.annotations.BuildStep;
+
+public class AutoAddScopeProcessor {
+
+    private static final Logger LOGGER = Logger.getLogger(AutoAddScopeProcessor.class);
+
+    @BuildStep
+    void annotationTransformer(List<AutoAddScopeBuildItem> autoScopes, CustomScopeAnnotationsBuildItem scopes,
+            List<AutoInjectAnnotationBuildItem> autoInjectAnnotations,
+            BuildProducer<AnnotationsTransformerBuildItem> annotationsTransformers,
+            BuildProducer<UnremovableBeanBuildItem> unremovableBeans,
+            BeanArchiveIndexBuildItem beanArchiveIndex) throws Exception {
+        if (autoScopes.isEmpty()) {
+            return;
+        }
+        Set<DotName> containerAnnotationNames = autoInjectAnnotations.stream().flatMap(a -> a.getAnnotationNames().stream())
+                .collect(Collectors.toSet());
+        containerAnnotationNames.add(DotNames.POST_CONSTRUCT);
+        containerAnnotationNames.add(DotNames.PRE_DESTROY);
+        containerAnnotationNames.add(DotNames.INJECT);
+
+        Set<DotName> unremovables = new HashSet<>();
+
+        annotationsTransformers.produce(new AnnotationsTransformerBuildItem(new AnnotationsTransformer() {
+
+            @Override
+            public boolean appliesTo(Kind kind) {
+                return kind == Kind.CLASS;
+            }
+
+            @Override
+            public void transform(TransformationContext context) {
+                if (scopes.isScopeIn(context.getAnnotations())) {
+                    // Skip classes annotated with a scope
+                    return;
+                }
+                ClassInfo clazz = context.getTarget().asClass();
+                Boolean requiresContainerServices = null;
+
+                for (AutoAddScopeBuildItem autoScope : autoScopes) {
+                    if (autoScope.isContainerServicesRequired()) {
+                        if (requiresContainerServices == null) {
+                            requiresContainerServices = requiresContainerServices(clazz, containerAnnotationNames,
+                                    beanArchiveIndex.getIndex());
+                        }
+                        if (!requiresContainerServices) {
+                            // Skip - no injection point detected
+                            continue;
+                        }
+                    }
+                    if (autoScope.test(clazz, context.getAnnotations(), beanArchiveIndex.getIndex())) {
+                        context.transform().add(autoScope.getDefaultScope()).done();
+                        if (autoScope.isUnremovable()) {
+                            unremovables.add(clazz.name());
+                        }
+                        LOGGER.debugf("Automatically added scope %s to class %s" + autoScope.getReason(),
+                                autoScope.getDefaultScope(), clazz, autoScope.getReason());
+                        break;
+                    }
+                }
+            }
+        }));
+
+        if (!unremovables.isEmpty()) {
+            unremovableBeans.produce(new UnremovableBeanBuildItem(new Predicate<BeanInfo>() {
+
+                @Override
+                public boolean test(BeanInfo bean) {
+                    return bean.isClassBean() && unremovables.contains(bean.getBeanClass());
+                }
+            }));
+        }
+    }
+
+    private boolean requiresContainerServices(ClassInfo clazz, Set<DotName> containerAnnotationNames, IndexView index) {
+        // Note that transformed methods/fields are not taken into account
+        if (hasContainerAnnotation(clazz, containerAnnotationNames)) {
+            return true;
+        }
+        if (index != null) {
+            DotName superName = clazz.superName();
+            while (superName != null && !superName.equals(DotNames.OBJECT)) {
+                ClassInfo superClass = index.getClassByName(superName);
+                if (superClass != null) {
+                    if (hasContainerAnnotation(clazz, containerAnnotationNames)) {
+                        return true;
+                    }
+                    superName = superClass.superName();
+                }
+            }
+        }
+        return false;
+    }
+
+    private boolean hasContainerAnnotation(ClassInfo clazz, Set<DotName> containerAnnotationNames) {
+        if (clazz.annotations().isEmpty() || containerAnnotationNames.isEmpty()) {
+            return false;
+        }
+        return containsAny(clazz, containerAnnotationNames);
+    }
+
+    private boolean containsAny(ClassInfo clazz, Set<DotName> annotationNames) {
+        for (DotName annotation : clazz.annotations().keySet()) {
+            if (annotationNames.contains(annotation)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+}

extensions/jsonb/deployment/pom.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <parent>
         <artifactId>quarkus-jsonb-parent</artifactId>
         <groupId>io.quarkus</groupId>
@@ -34,6 +34,11 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-jsonb</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-junit5-internal</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>