GH-344 - Polishing.

Switch to DelegatingEventExternalizer APIs changed to return CompletableFuture. Imports, formatting. Drop dependencies not needed.

pom.xml

@@ -43,6 +43,7 @@
 		<spring.version>6.1.0-RC1</spring.version> <!-- For Javadoc links only -->
 		<spring-boot.version>3.2.0-RC1</spring-boot.version>
 		<spring-cloud-aws-bom.version>3.0.2</spring-cloud-aws-bom.version>
+
 	</properties>
 
 	<developers>

spring-modulith-events/spring-modulith-events-aws-sns/pom.xml

@@ -34,12 +34,6 @@
 			<artifactId>spring-cloud-aws-sns</artifactId>
 		</dependency>
 
-		<dependency>
-			<groupId>com.fasterxml.jackson.core</groupId>
-			<artifactId>jackson-databind</artifactId>
-			<optional>true</optional>
-		</dependency>
-
 		<!-- Test dependencies -->
 
 		<dependency>

spring-modulith-events/spring-modulith-events-aws-sns/src/main/java/org/springframework/modulith/events/aws/sns/SnsEventExternalizerConfiguration.java

@@ -18,10 +18,11 @@
 import io.awspring.cloud.sns.core.SnsNotification;
 import io.awspring.cloud.sns.core.SnsOperations;
 import io.awspring.cloud.sns.core.SnsTemplate;
+
+import java.util.concurrent.CompletableFuture;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import software.amazon.awssdk.services.sns.model.InvalidParameterException;
-
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
@@ -30,7 +31,6 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.expression.BeanFactoryResolver;
 import org.springframework.expression.spel.support.StandardEvaluationContext;
-import org.springframework.messaging.MessageDeliveryException;
 import org.springframework.modulith.events.EventExternalizationConfiguration;
 import org.springframework.modulith.events.config.EventExternalizationAutoConfiguration;
 import org.springframework.modulith.events.support.BrokerRouting;
@@ -40,6 +40,7 @@
  * Auto-configuration to set up a {@link DelegatingEventExternalizer} to externalize events to SNS.
  *
  * @author Maciej Walkowiak
+ * @author Oliver Drotbohm
  * @since 1.1
  */
 @AutoConfiguration
@@ -64,22 +65,17 @@ DelegatingEventExternalizer snsEventExternalizer(EventExternalizationConfigurati
 		return new DelegatingEventExternalizer(configuration, (target, payload) -> {
 
 			var routing = BrokerRouting.of(target, context);
-
 			var builder = SnsNotification.builder(payload);
 			var key = routing.getKey(payload);
+
 			// when routing key is set, SNS topic must be a FIFO topic
 			if (key != null) {
 				builder.groupId(key);
 			}
-			try {
-				operations.sendNotification(routing.getTarget(), builder.build());
-			} catch (MessageDeliveryException e) {
-				// message delivery may fail if groupId is set and topic is not a FIFO topic, or content based deduplication has not been set on topic attributes.
-				if (e.getCause() instanceof InvalidParameterException) {
-					logger.error("Failed to send notification to SNS topic {}:{}", routing.getTarget(), e.getCause().getMessage());
-				}
-				throw e;
-			}
+
+			operations.sendNotification(routing.getTarget(), builder.build());
+
+			return CompletableFuture.completedFuture(null);
 		});
 	}
 }

spring-modulith-events/spring-modulith-events-aws-sns/src/main/java/org/springframework/modulith/events/aws/sns/package-info.java

@@ -1,5 +1,5 @@
 /**
- * SNS event externalization support.
+ * AWS SNS event externalization support.
  */
 @org.springframework.lang.NonNullApi
 package org.springframework.modulith.events.aws.sns;

spring-modulith-events/spring-modulith-events-aws-sns/src/test/java/org/springframework/modulith/events/aws/sns/SnsEventExternalizerConfigurationIntegrationTests.java

@@ -15,17 +15,17 @@
  */
 package org.springframework.modulith.events.aws.sns;
 
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
 import io.awspring.cloud.sns.core.SnsOperations;
-import org.junit.jupiter.api.Test;
 
+import org.junit.jupiter.api.Test;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.modulith.events.EventExternalizationConfiguration;
 import org.springframework.modulith.events.support.DelegatingEventExternalizer;
 
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.mockito.Mockito.mock;
-
 /**
  * Integration tests for {@link SnsEventExternalizerConfiguration}.
  *
@@ -34,7 +34,7 @@
  */
 class SnsEventExternalizerConfigurationIntegrationTests {
 
-	@Test // GH-342
+	@Test // GH-344
 	void registersExternalizerByDefault() {
 
 		basicSetup()
@@ -43,7 +43,7 @@ void registersExternalizerByDefault() {
 				});
 	}
 
-	@Test // GH-342
+	@Test // GH-344
 	void disablesExternalizationIfConfigured() {
 
 		basicSetup()