refactor: clean-up (operator-framework#2325)

Signed-off-by: Chris Laprun <claprun@redhat.com>
Co-authored-by: Attila Mészáros <csviri@gmail.com>
Signed-off-by: Attila Mészáros <csviri@gmail.com>

Author: metacosm

bootstrapper-maven-plugin/src/main/java/io/javaoperatorsdk/boostrapper/Bootstrapper.java

@@ -21,7 +21,7 @@ public class Bootstrapper {
 
   private static final Logger log = LoggerFactory.getLogger(Bootstrapper.class);
 
-  private MustacheFactory mustacheFactory = new DefaultMustacheFactory();
+  private final MustacheFactory mustacheFactory = new DefaultMustacheFactory();
 
   // .gitignore gets excluded from resource, using here a prefixed version
   private static final Map<String, String> TOP_LEVEL_STATIC_FILES =

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/BuilderUtils.java

@@ -10,7 +10,7 @@ public final class BuilderUtils {
   // prevent instantiation of util class
   private BuilderUtils() {}
 
-  public static final <T, B> B newBuilder(Class<B> builderType, T item) {
+  public static <T, B> B newBuilder(Class<B> builderType, T item) {
     Class<T> builderTargetType = builderTargetType(builderType);
     try {
       Constructor<B> constructor = builderType.getDeclaredConstructor(builderTargetType);

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/ReconcilerUtils.java

@@ -9,7 +9,6 @@
 import java.util.Objects;
 import java.util.function.Predicate;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
 import io.fabric8.kubernetes.api.builder.Builder;
 import io.fabric8.kubernetes.api.model.GenericKubernetesResource;
@@ -126,8 +125,7 @@ public static boolean specsEqual(HasMetadata r1, HasMetadata r2) {
   // will be replaced with: https://github.com/fabric8io/kubernetes-client/issues/3816
   public static Object getSpec(HasMetadata resource) {
     // optimize CustomResource case
-    if (resource instanceof CustomResource) {
-      CustomResource cr = (CustomResource) resource;
+    if (resource instanceof CustomResource cr) {
       return cr.getSpec();
     }
 
@@ -142,8 +140,7 @@ public static Object getSpec(HasMetadata resource) {
   @SuppressWarnings("unchecked")
   public static Object setSpec(HasMetadata resource, Object spec) {
     // optimize CustomResource case
-    if (resource instanceof CustomResource) {
-      CustomResource cr = (CustomResource) resource;
+    if (resource instanceof CustomResource cr) {
       cr.setSpec(spec);
       return null;
     }
@@ -191,8 +188,7 @@ public static void handleKubernetesClientException(Exception e, String resourceT
       throw ((MissingCRDException) e);
     }
 
-    if (e instanceof KubernetesClientException) {
-      KubernetesClientException ke = (KubernetesClientException) e;
+    if (e instanceof KubernetesClientException ke) {
       // only throw MissingCRDException if the 404 error occurs on the target CRD
       if (404 == ke.getCode() &&
           (resourceTypeName.equals(ke.getFullResourceName())
@@ -217,7 +213,7 @@ private static boolean matchesResourceType(String resourceTypeName,
           group = group.substring(0, group.length() - 1);
         }
         final var segments = Arrays.stream(group.split("/")).filter(Predicate.not(String::isEmpty))
-            .collect(Collectors.toUnmodifiableList());
+            .toList();
         if (segments.size() != 3) {
           return false;
         }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/BaseConfigurationService.java

@@ -260,8 +260,7 @@ private static <T> Configurator<T> configuratorFor(Class<T> instanceType,
 
   @SuppressWarnings({"unchecked", "rawtypes"})
   private static void configureFromAnnotatedReconciler(Object instance, Reconciler<?> reconciler) {
-    if (instance instanceof AnnotationConfigurable) {
-      AnnotationConfigurable configurable = (AnnotationConfigurable) instance;
+    if (instance instanceof AnnotationConfigurable configurable) {
       final Class<? extends Annotation> configurationClass =
           (Class<? extends Annotation>) Utils.getFirstTypeArgumentFromSuperClassOrInterface(
               instance.getClass(), AnnotationConfigurable.class);

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/ControllerConfigurationOverrider.java

@@ -10,7 +10,6 @@
 import io.fabric8.kubernetes.api.model.HasMetadata;
 import io.fabric8.kubernetes.client.informers.cache.ItemStore;
 import io.javaoperatorsdk.operator.api.config.dependent.DependentResourceSpec;
-import io.javaoperatorsdk.operator.api.config.workflow.WorkflowSpec;
 import io.javaoperatorsdk.operator.processing.event.rate.RateLimiter;
 import io.javaoperatorsdk.operator.processing.event.source.filter.GenericFilter;
 import io.javaoperatorsdk.operator.processing.event.source.filter.OnAddFilter;
@@ -39,7 +38,6 @@ public class ControllerConfigurationOverrider<R extends HasMetadata> {
   private String name;
   private String fieldManager;
   private Long informerListLimit;
-  private WorkflowSpec workflowSpec;
 
   private ControllerConfigurationOverrider(ControllerConfiguration<R> original) {
     this.finalizer = original.getFinalizerName();
@@ -57,7 +55,6 @@ private ControllerConfigurationOverrider(ControllerConfiguration<R> original) {
     this.fieldManager = original.fieldManager();
     this.informerListLimit = original.getInformerListLimit().orElse(null);
     this.itemStore = original.getItemStore().orElse(null);
-    this.workflowSpec = original.getWorkflowSpec().orElse(null);
   }
 
   public ControllerConfigurationOverrider<R> withFinalizer(String finalizer) {

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/LeaderElectionConfigurationBuilder.java

@@ -6,9 +6,10 @@
 
 import static io.javaoperatorsdk.operator.api.config.LeaderElectionConfiguration.*;
 
+@SuppressWarnings("unused")
 public final class LeaderElectionConfigurationBuilder {
 
-  private String leaseName;
+  private final String leaseName;
   private String leaseNamespace;
   private String identity;
   private Duration leaseDuration = LEASE_DURATION_DEFAULT_VALUE;

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/ResolvedControllerConfiguration.java

@@ -1,7 +1,10 @@
 package io.javaoperatorsdk.operator.api.config;
 
 import java.time.Duration;
-import java.util.*;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
 import io.fabric8.kubernetes.api.model.HasMetadata;
@@ -105,7 +108,6 @@ protected ResolvedControllerConfiguration(Class<P> resourceClass, String name,
     this.finalizer =
         ControllerConfiguration.ensureValidFinalizerName(finalizer, getResourceTypeName());
     this.fieldManager = fieldManager;
-    this.workflowSpec = workflowSpec;
   }
 
   protected ResolvedControllerConfiguration(Class<P> resourceClass, String name,

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/dependent/DependentResourceConfigurationResolver.java

@@ -22,8 +22,7 @@ private DependentResourceConfigurationResolver() {}
 
   public static <C extends ControllerConfiguration<? extends HasMetadata>> void configure(
       DependentResource dependentResource, DependentResourceSpec spec, C parentConfiguration) {
-    if (dependentResource instanceof DependentResourceConfigurator) {
-      final var configurator = (DependentResourceConfigurator) dependentResource;
+    if (dependentResource instanceof DependentResourceConfigurator configurator) {
       final var config = configurationFor(spec, parentConfiguration);
       configurator.configureWith(config);
     }
@@ -33,8 +32,7 @@ public static <C extends ControllerConfiguration<? extends HasMetadata>> Object
       DependentResourceSpec spec, C parentConfiguration) {
 
     // first check if the parent configuration has potentially already resolved the configuration
-    if (parentConfiguration instanceof DependentResourceConfigurationProvider) {
-      final var provider = (DependentResourceConfigurationProvider) parentConfiguration;
+    if (parentConfiguration instanceof DependentResourceConfigurationProvider provider) {
       final var configuration = provider.getConfigurationFor(spec);
       if (configuration != null) {
         return configuration;

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

@@ -237,8 +237,7 @@ public void initAndRegisterEventSources(EventSourceContext<P> context) {
     final var size = dependentResourcesByName.size();
     if (size > 0) {
       dependentResourcesByName.forEach((key, dependentResource) -> {
-        if (dependentResource instanceof EventSourceProvider) {
-          final var provider = (EventSourceProvider) dependentResource;
+        if (dependentResource instanceof EventSourceProvider provider) {
           final var source = provider.initEventSource(context);
           eventSourceManager.registerEventSource(key, source);
         } else {

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

@@ -11,7 +11,10 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.TreeMap;
-import java.util.stream.Collectors;
+import java.util.Optional;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.TreeMap;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -332,12 +335,12 @@ private static Map.Entry<Integer, Map<String, Object>> selectListEntryBasedOnKey
     }
     if (possibleTargets.isEmpty()) {
       throw new IllegalStateException("Cannot find list element for key: " + key + ", in map: "
-          + values.stream().map(Map::keySet).collect(Collectors.toList()));
+          + values.stream().map(Map::keySet).toList());
     }
     if (possibleTargets.size() > 1) {
       throw new IllegalStateException(
           "More targets found in list element for key: " + key + " in map: "
-              + values.stream().map(Map::keySet).collect(Collectors.toList()));
+              + values.stream().map(Map::keySet).toList());
     }
     return new AbstractMap.SimpleEntry<>(lastIndex, possibleTargets.get(0));
   }
@@ -349,7 +352,7 @@ private Optional<ManagedFieldsEntry> checkIfFieldManagerExists(R actual, String
         // field manager name.
         .filter(
             f -> f.getManager().equals(fieldManager) && f.getOperation().equals(APPLY_OPERATION))
-        .collect(Collectors.toList());
+        .toList();
     if (targetManagedFields.isEmpty()) {
       log.debug("No field manager exists for resource: {} with name: {} and operation {}",
           actual.getKind(),

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

@@ -166,8 +166,7 @@ private void submitReconciliationExecution(ResourceState state) {
 
   private void handleEventMarking(Event event, ResourceState state) {
     final var relatedCustomResourceID = event.getRelatedCustomResourceID();
-    if (event instanceof ResourceEvent) {
-      var resourceEvent = (ResourceEvent) event;
+    if (event instanceof ResourceEvent resourceEvent) {
       if (resourceEvent.getAction() == ResourceAction.DELETED) {
         log.debug("Marking delete event received for: {}", relatedCustomResourceID);
         state.markDeleteEventReceived();
@@ -331,8 +330,8 @@ private void handleRetryOnException(
   private void retryAwareErrorLogging(RetryExecution retry, boolean eventPresent,
       Exception exception,
       ExecutionScope<P> executionScope) {
-    if (!eventPresent && !retry.isLastAttempt() && exception instanceof KubernetesClientException) {
-      KubernetesClientException ex = (KubernetesClientException) exception;
+    if (!eventPresent && !retry.isLastAttempt()
+        && exception instanceof KubernetesClientException ex) {
       if (ex.getCode() == HttpURLConnection.HTTP_CONFLICT) {
         log.debug("Full client conflict error during event processing {}", executionScope,
             exception);

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

@@ -1,6 +1,11 @@
 package io.javaoperatorsdk.operator.processing.event;
 
-import java.util.*;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -104,8 +109,7 @@ public synchronized void stop() {
   @SuppressWarnings("rawtypes")
   private void logEventSourceEvent(NamedEventSource eventSource, String event) {
     if (log.isDebugEnabled()) {
-      if (eventSource.original() instanceof ResourceEventSource) {
-        ResourceEventSource source = (ResourceEventSource) eventSource.original();
+      if (eventSource.original() instanceof ResourceEventSource source) {
         log.debug("{} event source {} for {}", event,
             eventSource.isNameSet() ? eventSource.name() : eventSource,
             source.resourceType());
@@ -152,8 +156,7 @@ public final synchronized void registerEventSource(String name, EventSource even
       if (name == null || name.isBlank()) {
         name = EventSourceUtils.generateNameFor(eventSource);
       }
-      if (eventSource instanceof ManagedInformerEventSource) {
-        var managedInformerEventSource = ((ManagedInformerEventSource) eventSource);
+      if (eventSource instanceof ManagedInformerEventSource managedInformerEventSource) {
         managedInformerEventSource.setConfigurationService(
             controller.getConfiguration().getConfigurationService());
       }

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

@@ -49,8 +49,7 @@ public Class<?> type() {
   @Override
   @SuppressWarnings({"rawtypes", "unchecked"})
   public Optional<Class<?>> resourceType() {
-    if (original instanceof ResourceEventSource) {
-      ResourceEventSource resourceEventSource = (ResourceEventSource) original;
+    if (original instanceof ResourceEventSource resourceEventSource) {
       return Optional.of(resourceEventSource.resourceType());
     }
     return Optional.empty();
@@ -59,8 +58,7 @@ public Optional<Class<?>> resourceType() {
   @Override
   @SuppressWarnings("rawtypes")
   public Optional<?> configuration() {
-    if (original instanceof Configurable) {
-      Configurable configurable = (Configurable) original;
+    if (original instanceof Configurable configurable) {
       return Optional.ofNullable(configurable.configuration());
     }
     return Optional.empty();

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

@@ -36,11 +36,10 @@ public LinearRateLimiter(Duration refreshPeriod, int limitForPeriod) {
 
   @Override
   public Optional<Duration> isLimited(RateLimitState rateLimitState) {
-    if (!isActivated() || !(rateLimitState instanceof RateState)) {
+    if (!isActivated() || !(rateLimitState instanceof RateState actualState)) {
       return Optional.empty();
     }
 
-    var actualState = (RateState) rateLimitState;
     if (actualState.getCount() < limitForPeriod) {
       actualState.increaseCount();
       return Optional.empty();

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

@@ -1,6 +1,13 @@
 package io.javaoperatorsdk.operator.processing.event.source;
 
-import java.util.*;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -90,8 +97,7 @@ protected synchronized void handleResources(ResourceID primaryID, Set<R> newReso
   }
 
   protected synchronized void handleResources(Map<ResourceID, Set<R>> allNewResources) {
-    var toDelete = cache.keySet().stream().filter(k -> !allNewResources.containsKey(k))
-        .collect(Collectors.toList());
+    var toDelete = cache.keySet().stream().filter(k -> !allNewResources.containsKey(k)).toList();
     toDelete.forEach(this::handleDelete);
     allNewResources.forEach(this::handleResources);
   }
@@ -153,21 +159,15 @@ private boolean acceptedByFiler(Map<String, R> cachedResourceMap,
         .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
 
     if (onUpdateFilter != null || genericFilter != null) {
-      var anyUpdated = possibleUpdatedResources.entrySet().stream()
+      return possibleUpdatedResources.entrySet().stream()
           .anyMatch(
               entry -> {
                 var newResource = newResourcesMap.get(entry.getKey());
                 return acceptedByGenericFiler(newResource) &&
                     onUpdateFilter.accept(newResource, entry.getValue());
               });
-      if (anyUpdated) {
-        return true;
-      }
-    } else if (!possibleUpdatedResources.isEmpty()) {
-      return true;
-    }
-
-    return false;
+    } else
+      return !possibleUpdatedResources.isEmpty();
   }
 
   private boolean acceptedByGenericFiler(R resource) {

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

@@ -1,6 +1,10 @@
 package io.javaoperatorsdk.operator.processing.event.source.informer;
 
-import java.util.*;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
 import java.util.function.Function;
 import java.util.function.Predicate;
 import java.util.stream.Stream;
@@ -25,6 +29,7 @@
 import io.javaoperatorsdk.operator.processing.event.source.Configurable;
 import io.javaoperatorsdk.operator.processing.event.source.IndexerResourceCache;
 
+@SuppressWarnings("rawtypes")
 public abstract class ManagedInformerEventSource<R extends HasMetadata, P extends HasMetadata, C extends ResourceConfiguration<R>>
     extends AbstractResourceEventSource<R, P>
     implements ResourceEventHandler<R>, Cache<R>, IndexerResourceCache<R>,
@@ -36,7 +41,7 @@ public abstract class ManagedInformerEventSource<R extends HasMetadata, P extend
   private final boolean parseResourceVersions;
   private ConfigurationService configurationService;
   private final C configuration;
-  private Map<String, Function<R, List<String>>> indexers = new HashMap<>();
+  private final Map<String, Function<R, List<String>>> indexers = new HashMap<>();
   protected TemporaryResourceCache<R> temporaryResourceCache;
   protected MixedOperation client;
 
@@ -75,6 +80,7 @@ public void changeNamespaces(Set<String> namespaces) {
     }
   }
 
+  @SuppressWarnings("unchecked")
   @Override
   public synchronized void start() {
     if (isRunning()) {
@@ -124,6 +130,7 @@ public Optional<R> get(ResourceID resourceID) {
     }
   }
 
+  @SuppressWarnings("unused")
   public Optional<R> getCachedValue(ResourceID resourceID) {
     return get(resourceID);
   }