GH-3227: Implement handleOne() in CDEH

Fixes: #3227

* Implement handleOne() in `CommonDelegatingErrorHandler`
* Add tests for handle methods in `CommonDelegatingErrorHandler`
* Add tests for the new `handleOne()` method, as well as a test for `handleOtherException()`
* Checkstyle fixes

(cherry picked from commit 4e06c2c)

Author: Blackney

spring-kafka/src/main/java/org/springframework/kafka/listener/CommonDelegatingErrorHandler.java

@@ -38,6 +38,8 @@
  *
  * @author Gary Russell
  * @author Adrian Chlebosz
+ * @author Antonin Arquey
+ * @author Dan Blackney
  * @since 2.8
  *
  */
@@ -188,6 +190,19 @@ public void handleOtherException(Exception thrownException, Consumer<?, ?> consu
 		}
 	}
 
+	@Override
+	public boolean handleOne(Exception thrownException, ConsumerRecord<?, ?> record, Consumer<?, ?> consumer,
+			MessageListenerContainer container) {
+
+		CommonErrorHandler handler = findDelegate(thrownException);
+		if (handler != null) {
+			return handler.handleOne(thrownException, record, consumer, container);
+		}
+		else {
+			return this.defaultErrorHandler.handleOne(thrownException, record, consumer, container);
+		}
+	}
+
 	@Nullable
 	private CommonErrorHandler findDelegate(Throwable thrownException) {
 		Throwable cause = findCause(thrownException);

spring-kafka/src/test/java/org/springframework/kafka/listener/CommonDelegatingErrorHandlerTests.java

@@ -18,6 +18,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
@@ -27,6 +28,7 @@
 import java.util.Map;
 
 import org.apache.kafka.clients.consumer.Consumer;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
 import org.apache.kafka.clients.consumer.ConsumerRecords;
 import org.junit.jupiter.api.Test;
 
@@ -39,13 +41,15 @@
  *
  * @author Gary Russell
  * @author Adrian Chlebosz
+ * @author Antonin Arquey
+ * @author Dan Blackney
  * @since 2.8
  *
  */
 public class CommonDelegatingErrorHandlerTests {
 
 	@Test
-	void testRecordDelegates() {
+	void testHandleRemainingDelegates() {
 		var def = mock(CommonErrorHandler.class);
 		var one = mock(CommonErrorHandler.class);
 		var two = mock(CommonErrorHandler.class);
@@ -69,7 +73,7 @@ void testRecordDelegates() {
 	}
 
 	@Test
-	void testBatchDelegates() {
+	void testHandleBatchDelegates() {
 		var def = mock(CommonErrorHandler.class);
 		var one = mock(CommonErrorHandler.class);
 		var two = mock(CommonErrorHandler.class);
@@ -92,6 +96,54 @@ void testBatchDelegates() {
 		verify(one).handleBatch(any(), any(), any(), any(), any());
 	}
 
+	@Test
+	void testHandleOtherExceptionDelegates() {
+		var def = mock(CommonErrorHandler.class);
+		var one = mock(CommonErrorHandler.class);
+		var two = mock(CommonErrorHandler.class);
+		var three = mock(CommonErrorHandler.class);
+		var eh = new CommonDelegatingErrorHandler(def);
+		eh.setErrorHandlers(Map.of(IllegalStateException.class, one, IllegalArgumentException.class, two));
+		eh.addDelegate(RuntimeException.class, three);
+
+		eh.handleOtherException(wrap(new IOException()), mock(Consumer.class),
+				mock(MessageListenerContainer.class), true);
+		verify(def).handleOtherException(any(), any(), any(), anyBoolean());
+		eh.handleOtherException(wrap(new KafkaException("test")), mock(Consumer.class),
+				mock(MessageListenerContainer.class), true);
+		verify(three).handleOtherException(any(), any(), any(), anyBoolean());
+		eh.handleOtherException(wrap(new IllegalArgumentException()), mock(Consumer.class),
+				mock(MessageListenerContainer.class), true);
+		verify(two).handleOtherException(any(), any(), any(), anyBoolean());
+		eh.handleOtherException(wrap(new IllegalStateException()), mock(Consumer.class),
+				mock(MessageListenerContainer.class), true);
+		verify(one).handleOtherException(any(), any(), any(), anyBoolean());
+	}
+
+	@Test
+	void testHandleOneDelegates() {
+		var def = mock(CommonErrorHandler.class);
+		var one = mock(CommonErrorHandler.class);
+		var two = mock(CommonErrorHandler.class);
+		var three = mock(CommonErrorHandler.class);
+		var eh = new CommonDelegatingErrorHandler(def);
+		eh.setErrorHandlers(Map.of(IllegalStateException.class, one, IllegalArgumentException.class, two));
+		eh.addDelegate(RuntimeException.class, three);
+
+		eh.handleOne(wrap(new IOException()), mock(ConsumerRecord.class), mock(Consumer.class),
+				mock(MessageListenerContainer.class));
+		verify(def).handleOne(any(), any(), any(), any());
+		eh.handleOne(wrap(new KafkaException("test")), mock(ConsumerRecord.class), mock(Consumer.class),
+				mock(MessageListenerContainer.class));
+		verify(three).handleOne(any(), any(), any(), any());
+		eh.handleOne(wrap(new IllegalArgumentException()), mock(ConsumerRecord.class), mock(Consumer.class),
+				mock(MessageListenerContainer.class));
+		verify(two).handleOne(any(), any(), any(), any());
+		eh.handleOne(wrap(new IllegalStateException()), mock(ConsumerRecord.class), mock(Consumer.class),
+				mock(MessageListenerContainer.class));
+		verify(one).handleOne(any(), any(), any(), any());
+	}
+
 	@Test
 	void testDelegateForThrowableIsAppliedWhenCauseTraversingIsEnabled() {
 		var defaultHandler = mock(CommonErrorHandler.class);