Polish "Add a configuration property for KLC's idleBetweenPolls"

See gh-23048

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

@@ -184,10 +184,10 @@ public class ConcurrentKafkaListenerContainerFactoryConfigurer {
 		map.from(properties::getAckTime).as(Duration::toMillis).to(container::setAckTime);
 		map.from(properties::getPollTimeout).as(Duration::toMillis).to(container::setPollTimeout);
 		map.from(properties::getNoPollThreshold).to(container::setNoPollThreshold);
+		map.from(properties.getIdleBetweenPolls()).as(Duration::toMillis).to(container::setIdleBetweenPolls);
 		map.from(properties::getIdleEventInterval).as(Duration::toMillis).to(container::setIdleEventInterval);
 		map.from(properties::getMonitorInterval).as(Duration::getSeconds).as(Number::intValue)
 				.to(container::setMonitorInterval);
-		map.from(properties.getIdleBetweenPolls()).as(Duration::toMillis).to(container::setIdleBetweenPolls);
 		map.from(properties::getLogContainerConfig).to(container::setLogContainerConfig);
 		map.from(properties::isMissingTopicsFatal).to(container::setMissingTopicsFatal);
 		map.from(this.transactionManager).to(container::setTransactionManager);

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

@@ -886,15 +886,14 @@ public class KafkaProperties {
 		private Duration ackTime;
 
 		/**
-		 * Time between publishing idle consumer events (no data received).
+		 * Sleep interval between Consumer.poll(Duration) calls.
 		 */
-		private Duration idleEventInterval;
+		private Duration idleBetweenPolls = Duration.ZERO;
 
 		/**
-		 * The sleep interval in milliseconds between
-		 * {@link org.apache.kafka.clients.consumer.Consumer#poll(Duration)} calls.
+		 * Time between publishing idle consumer events (no data received).
 		 */
-		private Duration idleBetweenPolls;
+		private Duration idleEventInterval;
 
 		/**
 		 * Time between checks for non-responsive consumers. If a duration suffix is not
@@ -978,20 +977,20 @@ public class KafkaProperties {
 			this.ackTime = ackTime;
 		}
 
-		public Duration getIdleEventInterval() {
-			return this.idleEventInterval;
+		public Duration getIdleBetweenPolls() {
+			return this.idleBetweenPolls;
 		}
 
-		public void setIdleEventInterval(Duration idleEventInterval) {
-			this.idleEventInterval = idleEventInterval;
+		public void setIdleBetweenPolls(Duration idleBetweenPolls) {
+			this.idleBetweenPolls = idleBetweenPolls;
 		}
 
-		public Duration getIdleBetweenPolls() {
-			return idleBetweenPolls;
+		public Duration getIdleEventInterval() {
+			return this.idleEventInterval;
 		}
 
-		public void setIdleBetweenPolls(Duration idleBetweenPolls) {
-			this.idleBetweenPolls = idleBetweenPolls;
+		public void setIdleEventInterval(Duration idleEventInterval) {
+			this.idleEventInterval = idleEventInterval;
 		}
 
 		public Duration getMonitorInterval() {
@@ -1017,6 +1016,7 @@ public class KafkaProperties {
 		public void setMissingTopicsFatal(boolean missingTopicsFatal) {
 			this.missingTopicsFatal = missingTopicsFatal;
 		}
+
 	}
 
 	public static class Ssl {

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

@@ -368,8 +368,8 @@ class KafkaAutoConfigurationTests {
 						"spring.kafka.listener.ack-count=123", "spring.kafka.listener.ack-time=456",
 						"spring.kafka.listener.concurrency=3", "spring.kafka.listener.poll-timeout=2000",
 						"spring.kafka.listener.no-poll-threshold=2.5", "spring.kafka.listener.type=batch",
-						"spring.kafka.listener.idle-event-interval=1s", "spring.kafka.listener.monitor-interval=45",
-						"spring.kafka.listener.log-container-config=true",
+						"spring.kafka.listener.idle-between-polls=1s", "spring.kafka.listener.idle-event-interval=1s",
+						"spring.kafka.listener.monitor-interval=45", "spring.kafka.listener.log-container-config=true",
 						"spring.kafka.listener.missing-topics-fatal=true", "spring.kafka.jaas.enabled=true",
 						"spring.kafka.producer.transaction-id-prefix=foo", "spring.kafka.jaas.login-module=foo",
 						"spring.kafka.jaas.control-flag=REQUISITE", "spring.kafka.jaas.options.useKeyTab=true")
@@ -392,6 +392,7 @@ class KafkaAutoConfigurationTests {
 					assertThat(containerProperties.getAckTime()).isEqualTo(456L);
 					assertThat(containerProperties.getPollTimeout()).isEqualTo(2000L);
 					assertThat(containerProperties.getNoPollThreshold()).isEqualTo(2.5f);
+					assertThat(containerProperties.getIdleBetweenPolls()).isEqualTo(1000L);
 					assertThat(containerProperties.getIdleEventInterval()).isEqualTo(1000L);
 					assertThat(containerProperties.getMonitorInterval()).isEqualTo(45);
 					assertThat(containerProperties.isLogContainerConfig()).isTrue();