fix: avoid computing potentially unused values (#1759)

Fixes #1758

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/MDCUtils.java

@@ -14,10 +14,11 @@ public class MDCUtils {
   private static final String RESOURCE_VERSION = "resource.resourceVersion";
   private static final String GENERATION = "resource.generation";
   private static final String UID = "resource.uid";
+  private static final String NO_NAMESPACE = "no namespace";
 
   public static void addResourceIDInfo(ResourceID resourceID) {
     MDC.put(NAME, resourceID.getName());
-    MDC.put(NAMESPACE, resourceID.getNamespace().orElse("no namespace"));
+    MDC.put(NAMESPACE, resourceID.getNamespace().orElse(NO_NAMESPACE));
   }
 
   public static void removeResourceIDInfo() {

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/AbstractDependentResource.java

@@ -66,7 +66,7 @@ protected ReconcileResult<R> reconcile(P primary, R actualResource, Context<P> c
         if (updatable) {
           final Matcher.Result<R> match = match(actualResource, primary, context);
           if (!match.matched()) {
-            final var desired = match.computedDesired().orElse(desired(primary, context));
+            final var desired = match.computedDesired().orElseGet(() -> desired(primary, context));
             throwIfNull(desired, primary, "Desired");
             logForOperation("Updating", primary, desired);
             var updatedResource = handleUpdate(actualResource, desired, primary, context);
@@ -125,7 +125,7 @@ protected R handleCreate(R desired, P primary, Context<P> context) {
    * @param primary the {@link ResourceID} of the primary resource associated with the newly created
    *        resource
    * @param created the newly created resource
-   * @param context
+   * @param context the context in which this operation is called
    */
   protected abstract void onCreated(P primary, R created, Context<P> context);
 
@@ -136,7 +136,7 @@ protected R handleCreate(R desired, P primary, Context<P> context) {
    *        resource
    * @param updated the updated resource
    * @param actual the resource as it was before the update
-   * @param context
+   * @param context the context in which this operation is called
    */
   protected abstract void onUpdated(P primary, R updated, R actual, Context<P> context);
 

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

@@ -89,7 +89,7 @@ private EventProcessor(
         .map(c -> Map.of(
             Constants.RESOURCE_GVK_KEY, c.getAssociatedGroupVersionKind(),
             Constants.CONTROLLER_NAME, controllerConfiguration.getName()))
-        .orElse(new HashMap<>());
+        .orElseGet(HashMap::new);
   }
 
   @Override

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/informer/Mappers.java

@@ -20,28 +20,30 @@ public static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromAnnotation
     return fromMetadata(nameKey, null, false);
   }
 
+  @SuppressWarnings("unused")
   public static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromAnnotation(
       String nameKey, String namespaceKey) {
     return fromMetadata(nameKey, namespaceKey, false);
   }
 
-  public static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromLabel(
-      String nameKey) {
+  @SuppressWarnings("unused")
+  public static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromLabel(String nameKey) {
     return fromMetadata(nameKey, null, true);
   }
 
   public static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromDefaultAnnotations() {
     return fromMetadata(DEFAULT_ANNOTATION_FOR_NAME, DEFAULT_ANNOTATION_FOR_NAMESPACE, false);
   }
 
+  @SuppressWarnings("unused")
   public static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromLabel(
       String nameKey, String namespaceKey) {
     return fromMetadata(nameKey, namespaceKey, true);
   }
 
   public static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromOwnerReference() {
     return resource -> ResourceID.fromFirstOwnerReference(resource).map(Set::of)
-        .orElse(Collections.emptySet());
+        .orElseGet(Collections::emptySet);
   }
 
   private static <T extends HasMetadata> SecondaryToPrimaryMapper<T> fromMetadata(

operator-framework/src/test/java/io/javaoperatorsdk/operator/sample/externalstate/ExternalStateReconciler.java

@@ -10,7 +10,14 @@
 import io.fabric8.kubernetes.api.model.ObjectMetaBuilder;
 import io.fabric8.kubernetes.client.KubernetesClient;
 import io.javaoperatorsdk.operator.api.config.informer.InformerConfiguration;
-import io.javaoperatorsdk.operator.api.reconciler.*;
+import io.javaoperatorsdk.operator.api.reconciler.Cleaner;
+import io.javaoperatorsdk.operator.api.reconciler.Context;
+import io.javaoperatorsdk.operator.api.reconciler.ControllerConfiguration;
+import io.javaoperatorsdk.operator.api.reconciler.DeleteControl;
+import io.javaoperatorsdk.operator.api.reconciler.EventSourceContext;
+import io.javaoperatorsdk.operator.api.reconciler.EventSourceInitializer;
+import io.javaoperatorsdk.operator.api.reconciler.Reconciler;
+import io.javaoperatorsdk.operator.api.reconciler.UpdateControl;
 import io.javaoperatorsdk.operator.junit.KubernetesClientAware;
 import io.javaoperatorsdk.operator.processing.event.ResourceID;
 import io.javaoperatorsdk.operator.processing.event.source.EventSource;
@@ -89,9 +96,7 @@ private void createExternalResource(ExternalStateCustomResource resource) {
   public DeleteControl cleanup(ExternalStateCustomResource resource,
       Context<ExternalStateCustomResource> context) {
     var externalResource = context.getSecondaryResource(ExternalResource.class);
-    externalResource.ifPresent(er -> {
-      externalService.delete(er.getId());
-    });
+    externalResource.ifPresent(er -> externalService.delete(er.getId()));
     client.configMaps().inNamespace(resource.getMetadata().getNamespace())
         .withName(resource.getMetadata().getName()).delete();
     return DeleteControl.defaultDelete();
@@ -116,7 +121,7 @@ public Map<String, EventSource> prepareEventSources(
       }
       var id = configMap.getData().get(ID_KEY);
       var externalResource = externalService.read(id);
-      return externalResource.map(Set::of).orElse(Collections.emptySet());
+      return externalResource.map(Set::of).orElseGet(Collections::emptySet);
     }, context.getPrimaryCache(), 300L, ExternalResource.class);
 
     return EventSourceInitializer.nameEventSources(configMapEventSource,

operator-framework/src/test/java/io/javaoperatorsdk/operator/sample/externalstate/ExternalWithStateDependentResource.java

@@ -40,8 +40,8 @@ public Set<ExternalResource> fetchResources(
     return configMapOptional.map(configMap -> {
       var id = configMap.getData().get(ID_KEY);
       var externalResource = externalService.read(id);
-      return externalResource.map(Set::of).orElse(Collections.emptySet());
-    }).orElse(Collections.emptySet());
+      return externalResource.map(Set::of).orElseGet(Collections::emptySet);
+    }).orElseGet(Collections::emptySet);
   }
 
   @Override

sample-operators/mysql-schema/src/main/java/io/javaoperatorsdk/operator/sample/dependent/SchemaDependentResource.java

@@ -108,7 +108,7 @@ public static String decode(String value) {
   public Set<Schema> fetchResources(MySQLSchema primaryResource) {
     try (Connection connection = getConnection()) {
       return SchemaService.getSchema(connection, primaryResource.getMetadata().getName())
-          .map(Set::of).orElse(Collections.emptySet());
+          .map(Set::of).orElseGet(Collections::emptySet);
     } catch (SQLException e) {
       throw new RuntimeException("Error while trying read Schema", e);
     }
@@ -123,7 +123,7 @@ public ResourcePollerConfig configFrom(SchemaConfig configAnnotation,
         Class<SchemaDependentResource> originatingClass) {
       if (configAnnotation != null) {
         return new ResourcePollerConfig(configAnnotation.pollPeriod(),
-            new MySQLDbConfig(configAnnotation.host(), "" + configAnnotation.port(),
+            new MySQLDbConfig(configAnnotation.host(), String.valueOf(configAnnotation.port()),
                 configAnnotation.user(), configAnnotation.password()));
       }
       return new ResourcePollerConfig(SchemaConfig.DEFAULT_POLL_PERIOD,