feat(core): only detect listeners written by a developer

(Bridge) methods generated by the compiler (java) or for example synthetic kotlin suspend methods should be skipped.

These are placed next to the method written by the developer, have a cryptic method postfix and would otherwise show up as duplicate in the Springwolf documentation.

Note: All bridge methods are also synthetic methods.

springwolf-core/src/main/java/io/github/springwolf/core/asyncapi/scanners/channels/annotations/SpringAnnotationMethodLevelChannelsScanner.java

@@ -47,7 +47,7 @@ public Stream<Map.Entry<String, ChannelObject>> scan(Class<?> clazz) {
                 methodAnnotationClass.getName());
 
         return Arrays.stream(clazz.getDeclaredMethods())
-                .filter(method -> !method.isBridge())
+                .filter(AnnotationScannerUtil::isMethodInSourceCode)
                 .filter(method -> AnnotationScannerUtil.findAnnotation(methodAnnotationClass, method) != null)
                 .map(this::mapMethodToChannel);
     }

springwolf-core/src/main/java/io/github/springwolf/core/asyncapi/scanners/common/AsyncAnnotationScanner.java

@@ -60,7 +60,7 @@ protected Stream<MethodAndAnnotation<A>> getAnnotatedMethods(Class<?> type) {
         log.debug("Scanning class \"{}\" for @\"{}\" annotated methods", type.getName(), annotationClass.getName());
 
         return Arrays.stream(ReflectionUtils.getAllDeclaredMethods(type))
-                .filter(method -> !method.isBridge())
+                .filter(AnnotationScannerUtil::isMethodInSourceCode)
                 .filter(method -> AnnotationScannerUtil.findAnnotation(annotationClass, method) != null)
                 .peek(method -> log.debug("Mapping method \"{}\" to channels", method.getName()))
                 .flatMap(method -> AnnotationScannerUtil.findAnnotations(annotationClass, method).stream()

springwolf-core/src/main/java/io/github/springwolf/core/asyncapi/scanners/common/ClassLevelAnnotationScanner.java

@@ -18,7 +18,6 @@
 import io.github.springwolf.core.asyncapi.scanners.operations.annotations.SpringAnnotationClassLevelOperationsScanner;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.core.annotation.AnnotationUtils;
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Method;
@@ -58,8 +57,8 @@ protected Set<Method> getAnnotatedMethods(Class<?> clazz) {
                 methodAnnotationClass.getName());
 
         return Arrays.stream(clazz.getDeclaredMethods())
-                .filter(method -> !method.isBridge())
-                .filter(method -> AnnotationUtils.findAnnotation(method, methodAnnotationClass) != null)
+                .filter(AnnotationScannerUtil::isMethodInSourceCode)
+                .filter(method -> AnnotationScannerUtil.findAnnotation(methodAnnotationClass, method) != null)
                 .collect(toSet());
     }
 

springwolf-core/src/main/java/io/github/springwolf/core/asyncapi/scanners/common/utils/AnnotationScannerUtil.java

@@ -10,12 +10,20 @@
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.AnnotatedElement;
+import java.lang.reflect.Method;
 import java.util.Set;
 
 public class AnnotationScannerUtil {
 
     private AnnotationScannerUtil() {}
 
+    /**
+     * Check that a method was written by a developer and not generated by the compiler.
+     */
+    public static boolean isMethodInSourceCode(Method method) {
+        return !method.isSynthetic();
+    }
+
     public static <T extends Annotation> T findAnnotationOrThrow(Class<T> annotationClass, AnnotatedElement element) {
         T annotation = findAnnotation(annotationClass, element);
         if (annotation == null) {

springwolf-core/src/main/java/io/github/springwolf/core/asyncapi/scanners/operations/annotations/SpringAnnotationMethodLevelOperationsScanner.java

@@ -50,7 +50,7 @@ public Stream<Map.Entry<String, Operation>> scan(Class<?> clazz) {
                 methodAnnotationClass.getName());
 
         return Arrays.stream(clazz.getDeclaredMethods())
-                .filter(method -> !method.isBridge())
+                .filter(AnnotationScannerUtil::isMethodInSourceCode)
                 .filter(method -> AnnotationScannerUtil.findAnnotation(methodAnnotationClass, method) != null)
                 .map(this::mapMethodToOperation);
     }