add run on virtual threads

Author: Robert Pospisil

common/schema-builder/src/main/java/io/smallrye/graphql/schema/Annotations.java

@@ -581,6 +581,8 @@ private static Map<DotName, AnnotationInstance> getAnnotationsWithFilter(org.jbo
     // SmallRye Common Annotations
     public static final DotName BLOCKING = DotName.createSimple("io.smallrye.common.annotation.Blocking");
     public static final DotName NON_BLOCKING = DotName.createSimple("io.smallrye.common.annotation.NonBlocking");
+    public static final DotName RUN_ON_VIRTUAL_THREAD = DotName
+            .createSimple("io.smallrye.common.annotation.RunOnVirtualThread");
 
     // SmallRye GraphQL Annotations (Experimental)
     public static final DotName TO_SCALAR = DotName.createSimple("io.smallrye.graphql.api.ToScalar"); // TODO: Remove

common/schema-builder/src/main/java/io/smallrye/graphql/schema/creator/OperationCreator.java

@@ -326,13 +326,17 @@ private Execute getExecution(Annotations annotationsForMethod, Annotations annot
             return Execute.BLOCKING;
         } else if (annotationsForMethod.containsOneOfTheseAnnotations(Annotations.NON_BLOCKING)) {
             return Execute.NON_BLOCKING;
+        } else if (annotationsForMethod.containsOneOfTheseAnnotations(Annotations.RUN_ON_VIRTUAL_THREAD)) {
+            return Execute.RUN_ON_VIRTUAL_THREAD;
         }
 
         // then check annotation on class
         if (annotationsForClass.containsOneOfTheseAnnotations(Annotations.BLOCKING)) {
             return Execute.BLOCKING;
         } else if (annotationsForClass.containsOneOfTheseAnnotations(Annotations.NON_BLOCKING)) {
             return Execute.NON_BLOCKING;
+        } else if (annotationsForClass.containsOneOfTheseAnnotations(Annotations.RUN_ON_VIRTUAL_THREAD)) {
+            return Execute.RUN_ON_VIRTUAL_THREAD;
         }
 
         // lastly use default based on return type

common/schema-model/src/main/java/io/smallrye/graphql/schema/model/Execute.java

@@ -8,5 +8,6 @@
 public enum Execute {
     BLOCKING,
     NON_BLOCKING,
-    DEFAULT
+    DEFAULT,
+    RUN_ON_VIRTUAL_THREAD
 }