Merge pull request #41335 from travisriegler

* gh-41335:
  Polish "Group Kafka back-off properties"
  Group Kafka back-off properties

Closes gh-41335

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,7 +32,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.boot.autoconfigure.kafka.KafkaProperties.Jaas;
-import org.springframework.boot.autoconfigure.kafka.KafkaProperties.Retry.Topic;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties.Retry.Topic.Backoff;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.boot.ssl.SslBundles;
@@ -186,7 +186,7 @@ public class KafkaAutoConfiguration {
 			.useSingleTopicForSameIntervals()
 			.suffixTopicsWithIndexValues()
 			.doNotAutoCreateRetryTopics();
-		setBackOffPolicy(builder, retryTopic);
+		setBackOffPolicy(builder, retryTopic.getBackoff());
 		return builder.create(kafkaTemplate);
 	}
 
@@ -214,15 +214,15 @@ public class KafkaAutoConfiguration {
 		}
 	}
 
-	private static void setBackOffPolicy(RetryTopicConfigurationBuilder builder, Topic retryTopic) {
-		long delay = (retryTopic.getDelay() != null) ? retryTopic.getDelay().toMillis() : 0;
+	private static void setBackOffPolicy(RetryTopicConfigurationBuilder builder, Backoff retryTopicBackoff) {
+		long delay = (retryTopicBackoff.getDelay() != null) ? retryTopicBackoff.getDelay().toMillis() : 0;
 		if (delay > 0) {
 			PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 			BackOffPolicyBuilder backOffPolicy = BackOffPolicyBuilder.newBuilder();
 			map.from(delay).to(backOffPolicy::delay);
-			map.from(retryTopic.getMaxDelay()).as(Duration::toMillis).to(backOffPolicy::maxDelay);
-			map.from(retryTopic.getMultiplier()).to(backOffPolicy::multiplier);
-			map.from(retryTopic.isRandomBackOff()).to(backOffPolicy::random);
+			map.from(retryTopicBackoff.getMaxDelay()).as(Duration::toMillis).to(backOffPolicy::maxDelay);
+			map.from(retryTopicBackoff.getMultiplier()).to(backOffPolicy::multiplier);
+			map.from(retryTopicBackoff.isRandom()).to(backOffPolicy::random);
 			builder.customBackoff((SleepingBackOffPolicy<?>) backOffPolicy.build());
 		}
 		else {

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaProperties.java

@@ -34,6 +34,7 @@ import org.apache.kafka.common.serialization.StringDeserializer;
 import org.apache.kafka.common.serialization.StringSerializer;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.DeprecatedConfigurationProperty;
 import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.boot.context.properties.source.MutuallyExclusiveConfigurationPropertiesException;
 import org.springframework.boot.convert.DurationUnit;
@@ -1547,28 +1548,6 @@ public class KafkaProperties {
 			 */
 			private int attempts = 3;
 
-			/**
-			 * Canonical backoff period. Used as an initial value in the exponential case,
-			 * and as a minimum value in the uniform case.
-			 */
-			private Duration delay = Duration.ofSeconds(1);
-
-			/**
-			 * Multiplier to use for generating the next backoff delay.
-			 */
-			private double multiplier = 0.0;
-
-			/**
-			 * Maximum wait between retries. If less than the delay then the default of 30
-			 * seconds is applied.
-			 */
-			private Duration maxDelay = Duration.ZERO;
-
-			/**
-			 * Whether to have the backoff delays.
-			 */
-			private boolean randomBackOff = false;
-
 			public boolean isEnabled() {
 				return this.enabled;
 			}
@@ -1585,36 +1564,113 @@ public class KafkaProperties {
 				this.attempts = attempts;
 			}
 
+			@DeprecatedConfigurationProperty(replacement = "spring.kafka.retry.topic.backoff.delay", since = "3.4.0")
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public Duration getDelay() {
-				return this.delay;
+				return getBackoff().getDelay();
 			}
 
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public void setDelay(Duration delay) {
-				this.delay = delay;
+				getBackoff().setDelay(delay);
 			}
 
+			@DeprecatedConfigurationProperty(replacement = "spring.kafka.retry.topic.backoff.multiplier",
+					since = "3.4.0")
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public double getMultiplier() {
-				return this.multiplier;
+				return getBackoff().getMultiplier();
 			}
 
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public void setMultiplier(double multiplier) {
-				this.multiplier = multiplier;
+				getBackoff().setMultiplier(multiplier);
 			}
 
+			@DeprecatedConfigurationProperty(replacement = "spring.kafka.retry.topic.backoff.maxDelay", since = "3.4.0")
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public Duration getMaxDelay() {
-				return this.maxDelay;
+				return getBackoff().getMaxDelay();
 			}
 
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public void setMaxDelay(Duration maxDelay) {
-				this.maxDelay = maxDelay;
+				getBackoff().setMaxDelay(maxDelay);
 			}
 
+			@DeprecatedConfigurationProperty(replacement = "spring.kafka.retry.topic.backoff.random", since = "3.4.0")
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public boolean isRandomBackOff() {
-				return this.randomBackOff;
+				return getBackoff().isRandom();
 			}
 
+			@Deprecated(since = "3.4.0", forRemoval = true)
 			public void setRandomBackOff(boolean randomBackOff) {
-				this.randomBackOff = randomBackOff;
+				getBackoff().setRandom(randomBackOff);
+			}
+
+			private final Backoff backoff = new Backoff();
+
+			public Backoff getBackoff() {
+				return this.backoff;
+			}
+
+			public static class Backoff {
+
+				/**
+				 * Canonical backoff period. Used as an initial value in the exponential
+				 * case, and as a minimum value in the uniform case.
+				 */
+				private Duration delay = Duration.ofSeconds(1);
+
+				/**
+				 * Multiplier to use for generating the next backoff delay.
+				 */
+				private double multiplier = 0.0;
+
+				/**
+				 * Maximum wait between retries. If less than the delay then the default
+				 * of 30 seconds is applied.
+				 */
+				private Duration maxDelay = Duration.ZERO;
+
+				/**
+				 * Whether to have the backoff delays.
+				 */
+				private boolean random = false;
+
+				public Duration getDelay() {
+					return this.delay;
+				}
+
+				public void setDelay(Duration delay) {
+					this.delay = delay;
+				}
+
+				public double getMultiplier() {
+					return this.multiplier;
+				}
+
+				public void setMultiplier(double multiplier) {
+					this.multiplier = multiplier;
+				}
+
+				public Duration getMaxDelay() {
+					return this.maxDelay;
+				}
+
+				public void setMaxDelay(Duration maxDelay) {
+					this.maxDelay = maxDelay;
+				}
+
+				public boolean isRandom() {
+					return this.random;
+				}
+
+				public void setRandom(boolean random) {
+					this.random = random;
+				}
+
 			}
 
 		}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfigurationTests.java

@@ -442,6 +442,22 @@ class KafkaAutoConfigurationTests {
 
 	@Test
 	void retryTopicConfigurationWithExponentialBackOff() {
+		this.contextRunner.withPropertyValues("spring.application.name=my-test-app",
+				"spring.kafka.bootstrap-servers=localhost:9092,localhost:9093", "spring.kafka.retry.topic.enabled=true",
+				"spring.kafka.retry.topic.attempts=5", "spring.kafka.retry.topic.backoff.delay=100ms",
+				"spring.kafka.retry.topic.backoff.multiplier=2", "spring.kafka.retry.topic.backoff.max-delay=300ms")
+			.run((context) -> {
+				RetryTopicConfiguration configuration = context.getBean(RetryTopicConfiguration.class);
+				assertThat(configuration.getDestinationTopicProperties()).hasSize(5)
+					.extracting(DestinationTopic.Properties::delay, DestinationTopic.Properties::suffix)
+					.containsExactly(tuple(0L, ""), tuple(100L, "-retry-0"), tuple(200L, "-retry-1"),
+							tuple(300L, "-retry-2"), tuple(0L, "-dlt"));
+			});
+	}
+
+	@Test
+	@Deprecated(since = "3.4.0", forRemoval = true)
+	void retryTopicConfigurationWithExponentialBackOffUsingDeprecatedProperties() {
 		this.contextRunner.withPropertyValues("spring.application.name=my-test-app",
 				"spring.kafka.bootstrap-servers=localhost:9092,localhost:9093", "spring.kafka.retry.topic.enabled=true",
 				"spring.kafka.retry.topic.attempts=5", "spring.kafka.retry.topic.delay=100ms",
@@ -471,6 +487,18 @@ class KafkaAutoConfigurationTests {
 
 	@Test
 	void retryTopicConfigurationWithFixedBackOff() {
+		this.contextRunner.withPropertyValues("spring.application.name=my-test-app",
+				"spring.kafka.bootstrap-servers=localhost:9092,localhost:9093", "spring.kafka.retry.topic.enabled=true",
+				"spring.kafka.retry.topic.attempts=4", "spring.kafka.retry.topic.backoff.delay=2s")
+			.run(assertRetryTopicConfiguration(
+					(configuration) -> assertThat(configuration.getDestinationTopicProperties()).hasSize(3)
+						.extracting(DestinationTopic.Properties::delay)
+						.containsExactly(0L, 2000L, 0L)));
+	}
+
+	@Test
+	@Deprecated(since = "3.4.0", forRemoval = true)
+	void retryTopicConfigurationWithFixedBackOffUsingDeprecatedProperties() {
 		this.contextRunner.withPropertyValues("spring.application.name=my-test-app",
 				"spring.kafka.bootstrap-servers=localhost:9092,localhost:9093", "spring.kafka.retry.topic.enabled=true",
 				"spring.kafka.retry.topic.attempts=4", "spring.kafka.retry.topic.delay=2s")
@@ -482,6 +510,18 @@ class KafkaAutoConfigurationTests {
 
 	@Test
 	void retryTopicConfigurationWithNoBackOff() {
+		this.contextRunner.withPropertyValues("spring.application.name=my-test-app",
+				"spring.kafka.bootstrap-servers=localhost:9092,localhost:9093", "spring.kafka.retry.topic.enabled=true",
+				"spring.kafka.retry.topic.attempts=4", "spring.kafka.retry.topic.backoff.delay=0")
+			.run(assertRetryTopicConfiguration(
+					(configuration) -> assertThat(configuration.getDestinationTopicProperties()).hasSize(3)
+						.extracting(DestinationTopic.Properties::delay)
+						.containsExactly(0L, 0L, 0L)));
+	}
+
+	@Test
+	@Deprecated(since = "3.4.0", forRemoval = true)
+	void retryTopicConfigurationWithNoBackOffUsingDeprecatedProperties() {
 		this.contextRunner.withPropertyValues("spring.application.name=my-test-app",
 				"spring.kafka.bootstrap-servers=localhost:9092,localhost:9093", "spring.kafka.retry.topic.enabled=true",
 				"spring.kafka.retry.topic.attempts=4", "spring.kafka.retry.topic.delay=0")