refactor: use interface instead of implementation class

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/internal/CustomResourceEventSource.java

@@ -11,7 +11,6 @@
 import io.fabric8.kubernetes.client.WatcherException;
 import io.fabric8.kubernetes.client.dsl.MixedOperation;
 import io.fabric8.kubernetes.client.dsl.Resource;
-import io.fabric8.kubernetes.client.dsl.internal.CustomResourceOperationsImpl;
 import io.javaoperatorsdk.operator.api.config.ControllerConfiguration;
 import io.javaoperatorsdk.operator.processing.CustomResourceCache;
 import io.javaoperatorsdk.operator.processing.KubernetesResourceUtils;
@@ -30,7 +29,7 @@ public class CustomResourceEventSource<T extends CustomResource<?, ?>> extends A
 
   private static final Logger log = LoggerFactory.getLogger(CustomResourceEventSource.class);
 
-  private final CustomResourceOperationsImpl<T, KubernetesResourceList<T>> client;
+  private final MixedOperation<T, KubernetesResourceList<T>, Resource<T>> client;
   private final Set<String> targetNamespaces;
   private final boolean generationAware;
   private final String resourceFinalizer;
@@ -73,7 +72,7 @@ public CustomResourceEventSource(
       String resourceFinalizer,
       Class<T> resClass,
       CustomResourceCache customResourceCache) {
-    this.client = (CustomResourceOperationsImpl<T, KubernetesResourceList<T>>) client;
+    this.client = client;
     this.targetNamespaces = targetNamespaces;
     this.generationAware = generationAware;
     this.resourceFinalizer = resourceFinalizer;

operator-framework-core/src/test/java/io/javaoperatorsdk/operator/processing/event/internal/CustomResourceEventSourceTest.java

@@ -7,7 +7,8 @@
 
 import io.fabric8.kubernetes.api.model.KubernetesResourceList;
 import io.fabric8.kubernetes.client.Watcher;
-import io.fabric8.kubernetes.client.dsl.internal.CustomResourceOperationsImpl;
+import io.fabric8.kubernetes.client.dsl.MixedOperation;
+import io.fabric8.kubernetes.client.dsl.Resource;
 import io.javaoperatorsdk.operator.TestUtils;
 import io.javaoperatorsdk.operator.processing.event.EventHandler;
 import io.javaoperatorsdk.operator.sample.simple.TestCustomResource;
@@ -19,8 +20,11 @@
 class CustomResourceEventSourceTest {
 
   public static final String FINALIZER = "finalizer";
-  CustomResourceOperationsImpl<TestCustomResource, KubernetesResourceList<TestCustomResource>>
-      client = mock(CustomResourceOperationsImpl.class);
+  MixedOperation<
+          TestCustomResource,
+          KubernetesResourceList<TestCustomResource>,
+          Resource<TestCustomResource>>
+      client = mock(MixedOperation.class);
   EventHandler eventHandler = mock(EventHandler.class);
 
   private CustomResourceEventSource<TestCustomResource> customResourceEventSource =