Remove reflection and replace it with static Doneable class, thanks @adam-sandor

Author: kirek007

operator-framework/src/main/java/io/javaoperatorsdk/operator/ControllerUtils.java

@@ -51,26 +51,15 @@ static String getCrdName(ResourceController controller) {
                 return (Class<? extends CustomResourceDoneable<T>>) doneableClassCache.get(customResourceClass);
             }
 
-            ClassPool pool = ClassPool.getDefault();
-            pool.appendClassPath(new LoaderClassPath(Thread.currentThread().getContextClassLoader()));
-
-            CtClass superClass = pool.get(CustomResourceDoneable.class.getName());
-            CtClass function = pool.get(Function.class.getName());
-            CtClass customResource = pool.get(customResourceClass.getName());
-            CtClass[] argTypes = {customResource, function};
-            CtClass customDoneable = pool.makeClass(className, superClass);
-            CtConstructor ctConstructor = CtNewConstructor.make(argTypes, null, "super($1, $2);", customDoneable);
-            customDoneable.addConstructor(ctConstructor);
-
-            Class<? extends CustomResourceDoneable<T>> doneableClass;
-            if (JAVA_VERSION >= 9) {
-                doneableClass = (Class<? extends CustomResourceDoneable<T>>) customDoneable.toClass(customResourceClass);
-            } else {
-                doneableClass = (Class<? extends CustomResourceDoneable<T>>) customDoneable.toClass();
+            if (!getAnnotation(controller).customResourceDoneableClass().equals(Controller.EMPTY_DONEABLE.class)) {
+                Class<? extends CustomResourceDoneable<T>> doneableClass = (Class<? extends CustomResourceDoneable<T>>) getAnnotation(controller).customResourceDoneableClass();
+                doneableClassCache.put(customResourceClass, doneableClass);
+                return doneableClass;
             }
-            doneableClassCache.put(customResourceClass, doneableClass);
-            return doneableClass;
-        } catch (CannotCompileException | NotFoundException e) {
+
+            throw new RuntimeException("Cannot initialize Donealbe class");
+
+        } catch (RuntimeException e) {
             throw new IllegalStateException(e);
         }
     }

operator-framework/src/main/java/io/javaoperatorsdk/operator/api/Controller.java

@@ -1,6 +1,8 @@
 package io.javaoperatorsdk.operator.api;
 
+import io.fabric8.kubernetes.api.builder.Function;
 import io.fabric8.kubernetes.client.CustomResource;
+import io.fabric8.kubernetes.client.CustomResourceDoneable;
 
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
@@ -17,6 +19,8 @@
 
     Class<? extends CustomResource> customResourceClass();
 
+    Class<? extends CustomResourceDoneable<? extends CustomResource>> customResourceDoneableClass() default EMPTY_DONEABLE.class;
+
     String finalizerName() default DEFAULT_FINALIZER;
 
     /**
@@ -26,4 +30,10 @@
      * <a href="https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/#status-subresource">here</a>
      */
     boolean generationAwareEventProcessing() default true;
+
+    static final class EMPTY_DONEABLE extends CustomResourceDoneable<CustomResource> {
+        public EMPTY_DONEABLE(CustomResource resource, Function function) {
+            super(resource, function);
+        }
+    }
 }