improve: named event sources and related changes (#2340)

Signed-off-by: Attila Mészáros <[email protected]>
Signed-off-by: Chris Laprun <[email protected]>
Co-authored-by: Chris Laprun <[email protected]>
Signed-off-by: Attila Mészáros <[email protected]>

Author: csviri

caffeine-bounded-cache-support/src/test/java/io/javaoperatorsdk/operator/processing/event/source/cache/sample/AbstractTestReconciler.java

@@ -1,6 +1,7 @@
 package io.javaoperatorsdk.operator.processing.event.source.cache.sample;
 
 import java.time.Duration;
+import java.util.List;
 import java.util.Map;
 
 import org.slf4j.Logger;
@@ -69,7 +70,7 @@ protected void createConfigMap(P resource, Context<P> context) {
   }
 
   @Override
-  public Map<String, EventSource> prepareEventSources(
+  public List<EventSource> prepareEventSources(
       EventSourceContext<P> context) {
 
     var boundedItemStore =
@@ -82,7 +83,7 @@ public Map<String, EventSource> prepareEventSources(
             Mappers.fromOwnerReference(this instanceof BoundedCacheClusterScopeTestReconciler))
         .build(), context);
 
-    return EventSourceUtils.nameEventSources(es);
+    return List.of(es);
   }
 
   private void ensureStatus(P resource) {

docs/documentation/features.md

@@ -533,7 +533,7 @@ public class TomcatReconciler implements Reconciler<Tomcat> {
                       .withSecondaryToPrimaryMapper(
                               Mappers.fromAnnotation(ANNOTATION_NAME, ANNOTATION_NAMESPACE)
                                       .build(), context));
-      return EventSourceUtils.nameEventSources(configMapEventSource);
+      return List.of(configMapEventSource);
    }
 
 }

docs/documentation/v5-0-migration.md

@@ -17,8 +17,22 @@ permalink: /docs/v5-0-migration
    [`EventSourceUtils`](https://github.com/operator-framework/java-operator-sdk/blob/main/operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/EventSourceUtils.java#L11-L11)
    now contains all the utility methods used for event sources naming that were previously defined in
    the `EventSourceInitializer` interface.
-3. Updates through `UpdateControl` now use [Server Side Apply (SSA)](https://kubernetes.io/docs/reference/using-api/server-side-apply/) by default to add the finalizer and for all
-   the patch operations in `UpdateControl`. The update operations were removed. If you do not wish to use SSA, you can deactivate the feature using `ConfigurationService.useSSAToPatchPrimaryResource` and related `ConfigurationServiceOverrider.withUseSSAToPatchPrimaryResource`.
+3. Event sources are now explicitly named (via the `name` method of the `EventSource` interface). Built-in event sources
+   implementation have been updated to allow you to specify a name when instantiating them. If you don't provide a name
+   for your `EventSource` implementation (for example, by using its default, no-arg constructor), one will be
+   automatically generated. This simplifies the API to define event source to
+   `List<EventSource> prepareEventSources(EventSourceContext<P> context)`.
+   !!! IMPORTANT !!!
+   If you use dynamic registration of event sources, be sure to name your event sources explicitly as letting JOSDK name
+   them automatically might result in duplicated event sources being registered as JOSDK relies on the name to identify
+   event sources and concurrent, dynamic registration might lead to identical event sources having different generated
+   names, thus leading JOSDK to consider them as different and hence, register them multiple times.
+4. Updates through `UpdateControl` now
+   use [Server Side Apply (SSA)](https://kubernetes.io/docs/reference/using-api/server-side-apply/) by default to add
+   the finalizer and for all
+   the patch operations in `UpdateControl`. The update operations were removed. If you do not wish to use SSA, you can
+   deactivate the feature using `ConfigurationService.useSSAToPatchPrimaryResource` and
+   related `ConfigurationServiceOverrider.withUseSSAToPatchPrimaryResource`.
 
    !!! IMPORTANT !!!
 
@@ -27,15 +41,16 @@ permalink: /docs/v5-0-migration
    where it is demonstrated. Also, the related part of
    a [workaround](https://github.com/operator-framework/java-operator-sdk/blob/main/operator-framework/src/test/java/io/javaoperatorsdk/operator/StatusPatchSSAMigrationIT.java#L110-L116).
 
-   Related automatic observed generation handling changes: 
+   Related automatic observed generation handling changes:
    Automated Observed Generation (see features in docs), is automatically handled for non-SSA, even if
-   the status sub-resource is not instructed to be updated. This is not true for SSA, observed generation is updated 
+   the status sub-resource is not instructed to be updated. This is not true for SSA, observed generation is updated
    only when patch status is instructed by `UpdateControl`.
 
-4. `ManagedDependentResourceContext` has been renamed to `ManagedWorkflowAndDependentResourceContext` and is accessed
+5. `ManagedDependentResourceContext` has been renamed to `ManagedWorkflowAndDependentResourceContext` and is accessed
    via the accordingly renamed `managedWorkflowAndDependentResourceContext` method.
-5. `ResourceDiscriminator` was removed. In most of the cases you can just delete the discriminator, everything should
-    work without it by default. To optimize and handle special cases see the relevant section in [Dependent Resource documentation](/docs/dependent-resources#multiple-dependent-resources-of-same-type).
-6. `ConfigurationService.getTerminationTimeoutSeconds` and associated overriding mechanism have been removed,
+6. `ResourceDiscriminator` was removed. In most of the cases you can just delete the discriminator, everything should
+   work without it by default. To optimize and handle special cases see the relevant section
+   in [Dependent Resource documentation](/docs/dependent-resources#multiple-dependent-resources-of-same-type).
+7. `ConfigurationService.getTerminationTimeoutSeconds` and associated overriding mechanism have been removed,
    use `Operator.stop(Duration)` instead.
-7. `Operator.installShutdownHook()` has been removed, use `Operator.installShutdownHook(Duration)` instead
+8. `Operator.installShutdownHook()` has been removed, use `Operator.installShutdownHook(Duration)` instead

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

@@ -88,4 +88,5 @@ public Optional<ItemStore<R>> getItemStore() {
   public Optional<Long> getInformerListLimit() {
     return Optional.ofNullable(informerListLimit);
   }
+
 }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/Context.java

@@ -26,7 +26,6 @@ default <R> Stream<R> getSecondaryResourcesAsStream(Class<R> expectedType) {
     return getSecondaryResources(expectedType).stream();
   }
 
-  @Deprecated(forRemoval = true)
   <R> Optional<R> getSecondaryResource(Class<R> expectedType, String eventSourceName);
 
   ControllerConfiguration<P> getControllerConfiguration();

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/EventSourceUtils.java

@@ -6,66 +6,21 @@
 import io.javaoperatorsdk.operator.api.reconciler.dependent.DependentResource;
 import io.javaoperatorsdk.operator.processing.dependent.workflow.Workflow;
 import io.javaoperatorsdk.operator.processing.event.source.EventSource;
-import io.javaoperatorsdk.operator.processing.event.source.ResourceEventSource;
 
 public class EventSourceUtils {
-  /**
-   * Utility method to easily create map with generated name for event sources. This is for the use
-   * case when the event sources are not access explicitly by name in the reconciler.
-   *
-   * @param eventSources to name
-   * @return even source with default names
-   */
-  public static Map<String, EventSource> nameEventSources(EventSource... eventSources) {
-    Map<String, EventSource> eventSourceMap = new HashMap<>(eventSources.length);
-    for (EventSource eventSource : eventSources) {
-      eventSourceMap.put(generateNameFor(eventSource), eventSource);
-    }
-    return eventSourceMap;
+
+  @SuppressWarnings("unchecked")
+  public static <R extends HasMetadata> List<EventSource> dependentEventSources(
+      EventSourceContext<R> eventSourceContext, DependentResource... dependentResources) {
+    return Arrays.stream(dependentResources)
+        .flatMap(dr -> dr.eventSource(eventSourceContext).stream()).toList();
   }
 
   @SuppressWarnings("unchecked")
-  public static <K extends HasMetadata> Map<String, EventSource> eventSourcesFromWorkflow(
+  public static <K extends HasMetadata> List<EventSource> eventSourcesFromWorkflow(
       EventSourceContext<K> context,
       Workflow<K> workflow) {
-    Map<String, EventSource> result = new HashMap<>();
-    for (var e : workflow.getDependentResourcesByNameWithoutActivationCondition().entrySet()) {
-      var eventSource = e.getValue().eventSource(context);
-      eventSource.ifPresent(es -> result.put(e.getKey(), (EventSource) es));
-    }
-    return result;
-  }
-
-  @SuppressWarnings("rawtypes")
-  public static <K extends HasMetadata> Map<String, EventSource> nameEventSourcesFromDependentResource(
-      EventSourceContext<K> context, DependentResource... dependentResources) {
-    return nameEventSourcesFromDependentResource(context, Arrays.asList(dependentResources));
-  }
-
-  @SuppressWarnings("unchecked,rawtypes")
-  public static <K extends HasMetadata> Map<String, EventSource> nameEventSourcesFromDependentResource(
-      EventSourceContext<K> context, Collection<DependentResource> dependentResources) {
-
-    if (dependentResources != null) {
-      Map<String, EventSource> eventSourceMap = new HashMap<>(dependentResources.size());
-      for (DependentResource dependentResource : dependentResources) {
-        Optional<ResourceEventSource> es = dependentResource.eventSource(context);
-        es.ifPresent(e -> eventSourceMap.put(generateNameFor(e), e));
-      }
-      return eventSourceMap;
-    } else {
-      return Collections.emptyMap();
-    }
-  }
-
-  /**
-   * Used when event sources are not explicitly named when created/registered.
-   *
-   * @param eventSource EventSource
-   * @return generated name
-   */
-  public static String generateNameFor(EventSource eventSource) {
-    // we can have multiple event sources for the same class
-    return eventSource.getClass().getName() + "#" + eventSource.hashCode();
+    return workflow.getDependentResourcesWithoutActivationCondition().stream()
+        .flatMap(dr -> dr.eventSource(context).stream()).toList();
   }
 }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/Reconciler.java

@@ -19,17 +19,16 @@ public interface Reconciler<P extends HasMetadata> {
    */
   UpdateControl<P> reconcile(P resource, Context<P> context) throws Exception;
 
-
   /**
    * Prepares a map of {@link EventSource} implementations keyed by the name with which they need to
    * be registered by the SDK.
    *
    * @param context a {@link EventSourceContext} providing access to information useful to event
    *        sources
-   * @return a map of event sources to register
+   * @return a list of event sources
    */
-  default Map<String, EventSource> prepareEventSources(EventSourceContext<P> context) {
-    return Map.of();
+  default List<EventSource> prepareEventSources(EventSourceContext<P> context) {
+    return Collections.emptyList();
   }
 
 }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/dependent/EventSourceProvider.java

@@ -4,6 +4,7 @@
 import java.util.stream.Collectors;
 
 import io.javaoperatorsdk.operator.processing.event.EventSourceManager;
+import io.javaoperatorsdk.operator.processing.event.source.EventSource;
 
 @SuppressWarnings("rawtypes")
 public class ControllerHealthInfo {
@@ -15,21 +16,21 @@ public ControllerHealthInfo(EventSourceManager eventSourceManager) {
   }
 
   public Map<String, EventSourceHealthIndicator> eventSourceHealthIndicators() {
-    return eventSourceManager.allEventSources().entrySet().stream()
-        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    return eventSourceManager.allEventSources().stream()
+        .collect(Collectors.toMap(EventSource::name, e -> e));
   }
 
   public Map<String, EventSourceHealthIndicator> unhealthyEventSources() {
-    return eventSourceManager.allEventSources().entrySet().stream()
-        .filter(e -> e.getValue().getStatus() == Status.UNHEALTHY)
-        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    return eventSourceManager.allEventSources().stream()
+        .filter(e -> e.getStatus() == Status.UNHEALTHY)
+        .collect(Collectors.toMap(EventSource::name, e -> e));
   }
 
   public Map<String, InformerWrappingEventSourceHealthIndicator> informerEventSourceHealthIndicators() {
-    return eventSourceManager.allEventSources().entrySet().stream()
-        .filter(e -> e.getValue() instanceof InformerWrappingEventSourceHealthIndicator)
-        .collect(Collectors.toMap(Map.Entry::getKey,
-            e -> (InformerWrappingEventSourceHealthIndicator) e.getValue()));
+    return eventSourceManager.allEventSources().stream()
+        .filter(e -> e instanceof InformerWrappingEventSourceHealthIndicator)
+        .collect(Collectors.toMap(EventSource::name,
+            e -> (InformerWrappingEventSourceHealthIndicator) e));
 
   }
 
@@ -40,11 +41,11 @@ public Map<String, InformerWrappingEventSourceHealthIndicator> informerEventSour
    *         {@link io.javaoperatorsdk.operator.processing.event.source.informer.InformerEventSource}.
    */
   public Map<String, InformerWrappingEventSourceHealthIndicator> unhealthyInformerEventSourceHealthIndicators() {
-    return eventSourceManager.allEventSources().entrySet().stream()
-        .filter(e -> e.getValue().getStatus() == Status.UNHEALTHY)
-        .filter(e -> e.getValue() instanceof InformerWrappingEventSourceHealthIndicator)
-        .collect(Collectors.toMap(Map.Entry::getKey,
-            e -> (InformerWrappingEventSourceHealthIndicator) e.getValue()));
+    return eventSourceManager.allEventSources().stream()
+        .filter(e -> e.getStatus() == Status.UNHEALTHY)
+        .filter(e -> e instanceof InformerWrappingEventSourceHealthIndicator)
+        .collect(Collectors.toMap(EventSource::name,
+            e -> (InformerWrappingEventSourceHealthIndicator) e));
   }
 
 }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/health/ControllerHealthInfo.java

@@ -36,7 +36,6 @@
 import io.javaoperatorsdk.operator.api.reconciler.Reconciler;
 import io.javaoperatorsdk.operator.api.reconciler.UpdateControl;
 import io.javaoperatorsdk.operator.api.reconciler.dependent.EventSourceNotFoundException;
-import io.javaoperatorsdk.operator.api.reconciler.dependent.EventSourceProvider;
 import io.javaoperatorsdk.operator.api.reconciler.dependent.EventSourceReferencer;
 import io.javaoperatorsdk.operator.api.reconciler.dependent.managed.DefaultManagedWorkflowAndDependentResourceContext;
 import io.javaoperatorsdk.operator.health.ControllerHealthInfo;
@@ -235,22 +234,17 @@ public void initAndRegisterEventSources(EventSourceContext<P> context) {
 
     // register created event sources
     final var dependentResourcesByName =
-        managedWorkflow.getDependentResourcesByNameWithoutActivationCondition();
+        managedWorkflow.getDependentResourcesWithoutActivationCondition();
     final var size = dependentResourcesByName.size();
     if (size > 0) {
-      dependentResourcesByName.forEach((key, dependentResource) -> {
-        if (dependentResource instanceof EventSourceProvider provider) {
-          final var source = provider.initEventSource(context);
-          eventSourceManager.registerEventSource(key, source);
-        } else {
-          Optional<ResourceEventSource> eventSource = dependentResource.eventSource(context);
-          eventSource.ifPresent(es -> eventSourceManager.registerEventSource(key, es));
-        }
+      dependentResourcesByName.forEach(dependentResource -> {
+        Optional<ResourceEventSource> eventSource = dependentResource.eventSource(context);
+        eventSource.ifPresent(eventSourceManager::registerEventSource);
       });
 
       // resolve event sources referenced by name for dependents that reuse an existing event source
       final Map<String, List<EventSourceReferencer>> unresolvable = new HashMap<>(size);
-      dependentResourcesByName.values().stream()
+      dependentResourcesByName.stream()
           .filter(EventSourceReferencer.class::isInstance)
           .map(EventSourceReferencer.class::cast)
           .forEach(dr -> {