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  1. camunda BPM
  2. CAM-13770

In Quarkus, @ProcessVariableTyped and @ProcessVariable engine-cdi annotations cannot be used to create variables

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Details

    • Feature Request
    • Resolution: Unresolved
    • L3 - Default
    • None
    • None
    • quarkus
    • None

    Description

      User Story (Required on creation):

      As a user of the Quarkus Engine Extension, I can create variables by assigning values to class fields annotated with @ProcessVariableTyped or @ProcessVariable in a @StartProcess annotated method.

      Problem

      When a StartProcessInterceptor assigns a value to a field annotated with the annotations @ProcessVariableTyped or @ProcessVariable, and without @Inject, a new variable is created. This conflicts with the default Quarkus behavior: it tries to inject beans since the aforementioned annotations get in turn the annotation @Qualifier dynamically (implicitly) assigned. This breaks the engine-cdi behavior.

      Functional Requirements (Required before implementation):

      IDEA: @ProcessVariableTyped or @ProcessVariable annotated methods are skipped by the Quarkus auto-inject-fields feature.

      Technical Requirements (Required before implementation):

      Limitations of Scope (Optional):

      Hints (Optional):

      Solution idea

      Add a AnnotationsTransformerBuildItem to the quarkus extension:

        @BuildStep
        protected void annotationTransformer(ArcConfig config,
            BuildProducer<AnnotationsTransformerBuildItem> annotationsTransformer) {
          if (!config.autoInjectFields) {
            return;
          }
      
          annotationsTransformer.produce(new AnnotationsTransformerBuildItem(new AnnotationsTransformer() {
            @Override
            public boolean appliesTo(AnnotationTarget.Kind kind) {
              return kind == AnnotationTarget.Kind.FIELD;
            }
      
            @Override
            public int getPriority() {
              // Make sure this transformer is called after the AutoInjectFieldProcessor transformer
              return DEFAULT_PRIORITY;
            }
      
            @Override
            public void transform(TransformationContext ctx) {
              Collection<AnnotationInstance> fieldAnnotations = ctx.getAnnotations();
              if (Modifier.isStatic(ctx.getTarget().asField().flags()) || contains(fieldAnnotations, DotNames.INJECT)
                  || contains(fieldAnnotations, DotNames.PRODUCES)) {
                return;
              }
              DotName variableAnnotation = DotName.createSimple(ProcessVariable.class.getName());
              if (contains(fieldAnnotations, variableAnnotation)) {
                ctx.transform()
                    .remove(annotation -> annotation.name().equals(variableAnnotation))
                    .done();
      
              }
              DotName variableTypedAnnotation = DotName.createSimple(ProcessVariableTyped.class.getName());
              if (contains(fieldAnnotations, variableTypedAnnotation)) {
                ctx.transform()
                    .remove(annotation -> annotation.name().equals(variableTypedAnnotation))
                    .done();
      
              }
            }
          }));
        }
      

      mgm-controller-panel

        This is the controller panel for Smart Panels app

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                Unassigned Unassigned
                tassilo.weidner Tassilo Weidner
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                Dates

                  Created:
                  Updated:

                  Salesforce