Improve Pulsar listener container concurrency configuration

This is a follow-up to gh-42062 that utilizes newly introduced
`concurrency` property in `PulsarContainerProperties` to simplify
auto-configuration support for Pulsar listener container concurrency.

See: spring-projects/spring-pulsar#820

Author: vpavic

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/pulsar/PulsarAutoConfiguration.java

@@ -69,7 +69,6 @@
  * @author Alexander Preuß
  * @author Phillip Webb
  * @author Jonas Geiregat
- * @author Vedran Pavic
  * @since 3.2.0
  */
 @AutoConfiguration
@@ -188,10 +187,7 @@ ConcurrentPulsarListenerContainerFactory<?> pulsarListenerContainerFactory(
 		}
 		pulsarTransactionManager.ifUnique(containerProperties.transactions()::setTransactionManager);
 		this.propertiesMapper.customizeContainerProperties(containerProperties);
-		ConcurrentPulsarListenerContainerFactory<Object> listenerContainerFactory = new ConcurrentPulsarListenerContainerFactory<>(
-				pulsarConsumerFactory, containerProperties);
-		this.propertiesMapper.customizeConcurrentPulsarListenerContainerFactory(listenerContainerFactory);
-		return listenerContainerFactory;
+		return new ConcurrentPulsarListenerContainerFactory<>(pulsarConsumerFactory, containerProperties);
 	}
 
 	@Bean

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapper.java

@@ -196,16 +196,10 @@ private void customizePulsarContainerListenerProperties(PulsarContainerPropertie
 		PulsarProperties.Listener properties = this.properties.getListener();
 		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 		map.from(properties::getSchemaType).to(containerProperties::setSchemaType);
+		map.from(properties::getConcurrency).to(containerProperties::setConcurrency);
 		map.from(properties::isObservationEnabled).to(containerProperties::setObservationEnabled);
 	}
 
-	<T> void customizeConcurrentPulsarListenerContainerFactory(
-			ConcurrentPulsarListenerContainerFactory<T> listenerContainerFactory) {
-		PulsarProperties.Listener properties = this.properties.getListener();
-		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
-		map.from(properties::getConcurrency).to(listenerContainerFactory::setConcurrency);
-	}
-
 	<T> void customizeReaderBuilder(ReaderBuilder<T> readerBuilder) {
 		PulsarProperties.Reader properties = this.properties.getReader();
 		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapperTests.java

@@ -41,7 +41,6 @@
 
 import org.springframework.boot.autoconfigure.pulsar.PulsarProperties.Consumer;
 import org.springframework.boot.autoconfigure.pulsar.PulsarProperties.Failover.BackupCluster;
-import org.springframework.pulsar.config.ConcurrentPulsarListenerContainerFactory;
 import org.springframework.pulsar.core.PulsarProducerFactory;
 import org.springframework.pulsar.core.PulsarTemplate;
 import org.springframework.pulsar.listener.PulsarContainerProperties;
@@ -263,27 +262,18 @@ void customizeContainerProperties() {
 		PulsarProperties properties = new PulsarProperties();
 		properties.getConsumer().getSubscription().setType(SubscriptionType.Shared);
 		properties.getListener().setSchemaType(SchemaType.AVRO);
+		properties.getListener().setConcurrency(10);
 		properties.getListener().setObservationEnabled(true);
 		properties.getTransaction().setEnabled(true);
 		PulsarContainerProperties containerProperties = new PulsarContainerProperties("my-topic-pattern");
 		new PulsarPropertiesMapper(properties).customizeContainerProperties(containerProperties);
 		assertThat(containerProperties.getSubscriptionType()).isEqualTo(SubscriptionType.Shared);
 		assertThat(containerProperties.getSchemaType()).isEqualTo(SchemaType.AVRO);
+		assertThat(containerProperties.getConcurrency()).isEqualTo(10);
 		assertThat(containerProperties.isObservationEnabled()).isTrue();
 		assertThat(containerProperties.transactions().isEnabled()).isTrue();
 	}
 
-	@Test
-	void customizeConcurrentPulsarListenerContainerFactory() {
-		PulsarProperties properties = new PulsarProperties();
-		properties.getListener().setConcurrency(10);
-		ConcurrentPulsarListenerContainerFactory<?> listenerContainerFactory = mock(
-				ConcurrentPulsarListenerContainerFactory.class);
-		new PulsarPropertiesMapper(properties)
-			.customizeConcurrentPulsarListenerContainerFactory(listenerContainerFactory);
-		then(listenerContainerFactory).should().setConcurrency(10);
-	}
-
 	@Test
 	@SuppressWarnings("unchecked")
 	void customizeReaderBuilder() {