Refined Interface of EventSource and EventSourceManager (#597)

* WIP

* Addressing Custom Resource by Name and Namespace refactor + Informer Cache WIP

* fix: DefaultEventHandler init from EventSourceManager

* fix: custom resource selector test improvement

* fix: wip test imrpovements

* fix: test improvements

* fix: further improvements

* fix: build

* feature: add mvn jar to gitignore

* Exposing CustomResourceEventSource and informers

* fix: cleanup

* fix: remove caching optimization since it not possible anymore with informer

* fix:  formatting

* refactor: make name/namespace final

* feature: Simple label selector support

* fix: formatting

* fix: code inspection reports

* fix: merge from v2

* fix: removed most deprecated apis

* chore: renaming vars named k8sClient to kubernetsClient

* chore(deps): bump jandex-maven-plugin from 1.1.1 to 1.2.1 (#592)

Bumps [jandex-maven-plugin](https://github.com/wildfly/jandex-maven-plugin) from 1.1.1 to 1.2.1.
- [Release notes](https://github.com/wildfly/jandex-maven-plugin/releases)
- [Commits](wildfly/jandex-maven-plugin@1.1.1...1.2.1)

---
updated-dependencies:
- dependency-name: org.jboss.jandex:jandex-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps-dev): bump mockito-core from 3.12.4 to 4.0.0 (#591)

Bumps [mockito-core](https://github.com/mockito/mockito) from 3.12.4 to 4.0.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v3.12.4...v4.0.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* feature: Build PR on v2

* chore(ci): use Java 17

* chore(ci): use only Temurin distribution

* fix: Updated informer mapping to CustomResourceID

* chore: add generics to PostExecutionControl to reduce IDEs noise (#594)

* chore: polish the junit5 extension (#593)

* fix: EventSourceManager API wip

* fix: code review fixes

* fix: improvements of Event Source related APIs

* fix: remarks from code review

Co-authored-by: Chris Laprun <[email protected]>
Co-authored-by: Ioannis Canellos <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Luca Burgazzoli <[email protected]>

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

@@ -271,7 +271,7 @@ private RetryExecution getOrInitRetryExecution(ExecutionScope<R> executionScope)
   }
 
   private void cleanupAfterDeletedEvent(CustomResourceID customResourceUid) {
-    eventSourceManager.cleanup(customResourceUid);
+    eventSourceManager.cleanupForCustomResource(customResourceUid);
     eventBuffer.cleanup(customResourceUid);
   }
 

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

@@ -1,11 +1,6 @@
 package io.javaoperatorsdk.operator.processing.event;
 
-import java.io.IOException;
-import java.util.Collections;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.concurrent.ConcurrentHashMap;
+import java.util.*;
 import java.util.concurrent.locks.ReentrantLock;
 
 import org.slf4j.Logger;
@@ -22,119 +17,81 @@
 public class DefaultEventSourceManager<R extends CustomResource<?, ?>>
     implements EventSourceManager {
 
-  public static final String RETRY_TIMER_EVENT_SOURCE_NAME = "retry-timer-event-source";
-  public static final String CUSTOM_RESOURCE_EVENT_SOURCE_NAME = "custom-resource-event-source";
   private static final Logger log = LoggerFactory.getLogger(DefaultEventSourceManager.class);
 
   private final ReentrantLock lock = new ReentrantLock();
-  private final Map<String, EventSource> eventSources = new ConcurrentHashMap<>();
+  private final Set<EventSource> eventSources = Collections.synchronizedSet(new HashSet<>());
   private DefaultEventHandler<R> defaultEventHandler;
   private TimerEventSource<R> retryTimerEventSource;
+  private CustomResourceEventSource customResourceEventSource;
 
   DefaultEventSourceManager(DefaultEventHandler<R> defaultEventHandler) {
     init(defaultEventHandler);
   }
 
   public DefaultEventSourceManager(ConfiguredController<R> controller) {
-    CustomResourceEventSource customResourceEventSource =
-        new CustomResourceEventSource<>(controller);
+    customResourceEventSource = new CustomResourceEventSource<>(controller);
     init(new DefaultEventHandler<>(controller, customResourceEventSource));
-    registerEventSource(CUSTOM_RESOURCE_EVENT_SOURCE_NAME, customResourceEventSource);
+    registerEventSource(customResourceEventSource);
   }
 
   private void init(DefaultEventHandler<R> defaultEventHandler) {
     this.defaultEventHandler = defaultEventHandler;
     defaultEventHandler.setEventSourceManager(this);
 
     this.retryTimerEventSource = new TimerEventSource<>();
-    registerEventSource(RETRY_TIMER_EVENT_SOURCE_NAME, retryTimerEventSource);
+    registerEventSource(retryTimerEventSource);
   }
 
   @Override
   public void close() {
+    lock.lock();
     try {
-      lock.lock();
-
       try {
         defaultEventHandler.close();
       } catch (Exception e) {
         log.warn("Error closing event handler", e);
       }
-
-      for (var entry : eventSources.entrySet()) {
+      log.debug("Closing event sources.");
+      for (var eventSource : eventSources) {
         try {
-          log.debug("Closing {} -> {}", entry.getKey(), entry.getValue());
-          entry.getValue().close();
+          eventSource.close();
         } catch (Exception e) {
-          log.warn("Error closing {} -> {}", entry.getKey(), entry.getValue(), e);
+          log.warn("Error closing {} -> {}", eventSource);
         }
       }
-
       eventSources.clear();
     } finally {
       lock.unlock();
     }
   }
 
   @Override
-  public final void registerEventSource(String name, EventSource eventSource)
+  public final void registerEventSource(EventSource eventSource)
       throws OperatorException {
     Objects.requireNonNull(eventSource, "EventSource must not be null");
-
+    lock.lock();
     try {
-      lock.lock();
-      if (eventSources.containsKey(name)) {
-        throw new IllegalStateException(
-            "Event source with name already registered. Event source name: " + name);
-      }
-      eventSources.put(name, eventSource);
+      eventSources.add(eventSource);
       eventSource.setEventHandler(defaultEventHandler);
       eventSource.start();
     } catch (Throwable e) {
       if (e instanceof IllegalStateException || e instanceof MissingCRDException) {
         // leave untouched
         throw e;
       }
-      throw new OperatorException("Couldn't register event source named '" + name + "'", e);
-    } finally {
-      lock.unlock();
-    }
-  }
-
-  @Override
-  public Optional<EventSource> deRegisterEventSource(String name) {
-    try {
-      lock.lock();
-      EventSource currentEventSource = eventSources.remove(name);
-      if (currentEventSource != null) {
-        try {
-          currentEventSource.close();
-        } catch (IOException e) {
-          throw new RuntimeException(e);
-        }
-      }
-
-      return Optional.ofNullable(currentEventSource);
+      throw new OperatorException(
+          "Couldn't register event source: " + eventSource.getClass().getName(), e);
     } finally {
       lock.unlock();
     }
   }
 
-  @Override
-  public Optional<EventSource> deRegisterCustomResourceFromEventSource(
-      String eventSourceName, CustomResourceID customResourceUid) {
+  public void cleanupForCustomResource(CustomResourceID customResourceUid) {
+    lock.lock();
     try {
-      lock.lock();
-      EventSource eventSource = this.eventSources.get(eventSourceName);
-      if (eventSource == null) {
-        log.warn(
-            "Event producer: {} not found for custom resource: {}",
-            eventSourceName,
-            customResourceUid);
-        return Optional.empty();
-      } else {
-        eventSource.eventSourceDeRegisteredForResource(customResourceUid);
-        return Optional.of(eventSource);
+      for (EventSource eventSource : this.eventSources) {
+        eventSource.cleanupForCustomResource(customResourceUid);
       }
     } finally {
       lock.unlock();
@@ -146,19 +103,13 @@ public TimerEventSource getRetryTimerEventSource() {
   }
 
   @Override
-  public Map<String, EventSource> getRegisteredEventSources() {
-    return Collections.unmodifiableMap(eventSources);
+  public Set<EventSource> getRegisteredEventSources() {
+    return Collections.unmodifiableSet(eventSources);
   }
 
   @Override
   public CustomResourceEventSource getCustomResourceEventSource() {
-    return (CustomResourceEventSource) getRegisteredEventSources()
-        .get(CUSTOM_RESOURCE_EVENT_SOURCE_NAME);
+    return customResourceEventSource;
   }
 
-  public void cleanup(CustomResourceID customResourceUid) {
-    getRegisteredEventSources()
-        .keySet()
-        .forEach(k -> deRegisterCustomResourceFromEventSource(k, customResourceUid));
-  }
 }

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

@@ -20,5 +20,10 @@ default void close() throws IOException {}
 
   void setEventHandler(EventHandler eventHandler);
 
-  default void eventSourceDeRegisteredForResource(CustomResourceID customResourceUid) {}
+  /**
+   * Automatically called when a custom resource is deleted from the cluster.
+   *
+   * @param customResourceUid - id of custom resource
+   */
+  default void cleanupForCustomResource(CustomResourceID customResourceUid) {}
 }

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

@@ -2,8 +2,7 @@
 
 import java.io.Closeable;
 import java.io.IOException;
-import java.util.Map;
-import java.util.Optional;
+import java.util.Set;
 
 import io.fabric8.kubernetes.client.CustomResource;
 import io.javaoperatorsdk.operator.OperatorException;
@@ -14,29 +13,15 @@ public interface EventSourceManager<T extends CustomResource<?, ?>> extends Clos
   /**
    * Add the {@link EventSource} identified by the given <code>name</code> to the event manager.
    *
-   * @param name the name of the {@link EventSource} to add
    * @param eventSource the {@link EventSource} to register
    * @throws IllegalStateException if an {@link EventSource} with the same name is already
    *         registered.
    * @throws OperatorException if an error occurred during the registration process
    */
-  void registerEventSource(String name, EventSource eventSource)
+  void registerEventSource(EventSource eventSource)
       throws IllegalStateException, OperatorException;
 
-  /**
-   * Remove the {@link EventSource} identified by the given <code>name</code> from the event
-   * manager.
-   *
-   * @param name the name of the {@link EventSource} to remove
-   * @return an optional {@link EventSource} which would be empty if no {@link EventSource} have
-   *         been registered with the given name.
-   */
-  Optional<EventSource> deRegisterEventSource(String name);
-
-  Optional<EventSource> deRegisterCustomResourceFromEventSource(
-      String name, CustomResourceID customResourceUid);
-
-  Map<String, EventSource> getRegisteredEventSources();
+  Set<EventSource> getRegisteredEventSources();
 
   CustomResourceEventSource<T> getCustomResourceEventSource();
 

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

@@ -50,7 +50,7 @@ public void scheduleOnce(R customResource, long delay) {
   }
 
   @Override
-  public void eventSourceDeRegisteredForResource(CustomResourceID customResourceUid) {
+  public void cleanupForCustomResource(CustomResourceID customResourceUid) {
     cancelSchedule(customResourceUid);
     cancelOnceSchedule(customResourceUid);
   }

operator-framework-core/src/test/java/io/javaoperatorsdk/operator/processing/DefaultEventHandlerTest.java

@@ -119,7 +119,7 @@ public void cleanUpAfterDeleteEvent() {
 
     waitMinimalTime();
     verify(defaultEventSourceManagerMock, times(1))
-        .cleanup(CustomResourceID.fromResource(customResource));
+        .cleanupForCustomResource(CustomResourceID.fromResource(customResource));
   }
 
   @Test

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

@@ -1,7 +1,7 @@
 package io.javaoperatorsdk.operator.processing.event;
 
 import java.io.IOException;
-import java.util.Map;
+import java.util.Set;
 
 import org.junit.jupiter.api.Test;
 
@@ -10,16 +10,13 @@
 import io.javaoperatorsdk.operator.processing.DefaultEventHandler;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 import static org.mockito.Mockito.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
 class DefaultEventSourceManagerTest {
 
-  public static final String CUSTOM_EVENT_SOURCE_NAME = "CustomEventSource";
-
   private DefaultEventHandler defaultEventHandlerMock = mock(DefaultEventHandler.class);
   private DefaultEventSourceManager defaultEventSourceManager =
       new DefaultEventSourceManager(defaultEventHandlerMock);
@@ -28,12 +25,12 @@ class DefaultEventSourceManagerTest {
   public void registersEventSource() {
     EventSource eventSource = mock(EventSource.class);
 
-    defaultEventSourceManager.registerEventSource(CUSTOM_EVENT_SOURCE_NAME, eventSource);
+    defaultEventSourceManager.registerEventSource(eventSource);
 
-    Map<String, EventSource> registeredSources =
+    Set<EventSource> registeredSources =
         defaultEventSourceManager.getRegisteredEventSources();
-    assertThat(registeredSources.entrySet()).hasSize(2);
-    assertThat(registeredSources.get(CUSTOM_EVENT_SOURCE_NAME)).isEqualTo(eventSource);
+    assertThat(registeredSources).hasSize(2);
+
     verify(eventSource, times(1)).setEventHandler(eq(defaultEventHandlerMock));
     verify(eventSource, times(1)).start();
   }
@@ -42,37 +39,25 @@ public void registersEventSource() {
   public void closeShouldCascadeToEventSources() throws IOException {
     EventSource eventSource = mock(EventSource.class);
     EventSource eventSource2 = mock(EventSource.class);
-    defaultEventSourceManager.registerEventSource(CUSTOM_EVENT_SOURCE_NAME, eventSource);
-    defaultEventSourceManager.registerEventSource(CUSTOM_EVENT_SOURCE_NAME + "2", eventSource2);
+    defaultEventSourceManager.registerEventSource(eventSource);
+    defaultEventSourceManager.registerEventSource(eventSource2);
 
     defaultEventSourceManager.close();
 
     verify(eventSource, times(1)).close();
     verify(eventSource2, times(1)).close();
   }
 
-  @Test
-  public void throwExceptionIfRegisteringEventSourceWithSameName() {
-    EventSource eventSource = mock(EventSource.class);
-    EventSource eventSource2 = mock(EventSource.class);
-
-    defaultEventSourceManager.registerEventSource(CUSTOM_EVENT_SOURCE_NAME, eventSource);
-    assertThatExceptionOfType(IllegalStateException.class)
-        .isThrownBy(
-            () -> defaultEventSourceManager.registerEventSource(CUSTOM_EVENT_SOURCE_NAME,
-                eventSource2));
-  }
-
   @Test
   public void deRegistersEventSources() {
     CustomResource customResource = TestUtils.testCustomResource();
     EventSource eventSource = mock(EventSource.class);
-    defaultEventSourceManager.registerEventSource(CUSTOM_EVENT_SOURCE_NAME, eventSource);
+    defaultEventSourceManager.registerEventSource(eventSource);
 
-    defaultEventSourceManager.deRegisterCustomResourceFromEventSource(
-        CUSTOM_EVENT_SOURCE_NAME, CustomResourceID.fromResource(customResource));
+    defaultEventSourceManager
+        .cleanupForCustomResource(CustomResourceID.fromResource(customResource));
 
     verify(eventSource, times(1))
-        .eventSourceDeRegisteredForResource(eq(CustomResourceID.fromResource(customResource)));
+        .cleanupForCustomResource(eq(CustomResourceID.fromResource(customResource)));
   }
 }

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

@@ -61,7 +61,7 @@ public void deRegistersPeriodicalEventSources() {
     untilAsserted(() -> assertThat(eventHandlerMock.events).hasSizeGreaterThan(1));
 
     timerEventSource
-        .eventSourceDeRegisteredForResource(CustomResourceID.fromResource(customResource));
+        .cleanupForCustomResource(CustomResourceID.fromResource(customResource));
 
     int size = eventHandlerMock.events.size();
     untilAsserted(() -> assertThat(eventHandlerMock.events).hasSize(size));
@@ -103,7 +103,7 @@ public void deRegistersOnceEventSources() {
 
     timerEventSource.scheduleOnce(customResource, PERIOD);
     timerEventSource
-        .eventSourceDeRegisteredForResource(CustomResourceID.fromResource(customResource));
+        .cleanupForCustomResource(CustomResourceID.fromResource(customResource));
 
     untilAsserted(() -> assertThat(eventHandlerMock.events).isEmpty());
   }

operator-framework/src/test/java/io/javaoperatorsdk/operator/sample/event/EventSourceTestCustomResourceController.java

@@ -32,7 +32,7 @@ public class EventSourceTestCustomResourceController
 
   @Override
   public void init(EventSourceManager eventSourceManager) {
-    eventSourceManager.registerEventSource("Timer", timerEventSource);
+    eventSourceManager.registerEventSource(timerEventSource);
   }
 
   @Override

operator-framework/src/test/java/io/javaoperatorsdk/operator/sample/informereventsource/InformerEventSourceTestCustomResourceController.java

@@ -37,7 +37,7 @@ public class InformerEventSourceTestCustomResourceController implements
   public void init(EventSourceManager eventSourceManager) {
     eventSource = new InformerEventSource<>(kubernetesClient, ConfigMap.class,
         Mappers.fromAnnotation(RELATED_RESOURCE_UID));
-    eventSourceManager.registerEventSource("configmap", eventSource);
+    eventSourceManager.registerEventSource(eventSource);
   }
 
   @Override