Introduce PollerMetadataCustomizer for Spring Integration

See gh-44637

Signed-off-by: Yanming Zhou <zhouyanming@gmail.com>

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfiguration.java

@@ -24,6 +24,7 @@ import javax.sql.DataSource;
 import io.rsocket.transport.netty.server.TcpServerTransport;
 
 import org.springframework.beans.factory.BeanFactory;
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
@@ -85,6 +86,7 @@ import org.springframework.util.StringUtils;
  * @author Vedran Pavic
  * @author Madhura Bhave
  * @author Yong-Hyun Kim
+ * @author Yanming Zhou
  * @since 1.1.0
  */
 @AutoConfiguration(after = { DataSourceAutoConfiguration.class, JmxAutoConfiguration.class,
@@ -130,7 +132,8 @@ public class IntegrationAutoConfiguration {
 
 		@Bean(PollerMetadata.DEFAULT_POLLER)
 		@ConditionalOnMissingBean(name = PollerMetadata.DEFAULT_POLLER)
-		public PollerMetadata defaultPollerMetadata(IntegrationProperties integrationProperties) {
+		public PollerMetadata defaultPollerMetadata(IntegrationProperties integrationProperties,
+				ObjectProvider<PollerMetadataCustomizer> customizers) {
 			IntegrationProperties.Poller poller = integrationProperties.getPoller();
 			MutuallyExclusiveConfigurationPropertiesException.throwIfMultipleNonNullValuesIn((entries) -> {
 				entries.put("spring.integration.poller.cron",
@@ -143,6 +146,7 @@ public class IntegrationAutoConfiguration {
 			map.from(poller::getMaxMessagesPerPoll).to(pollerMetadata::setMaxMessagesPerPoll);
 			map.from(poller::getReceiveTimeout).as(Duration::toMillis).to(pollerMetadata::setReceiveTimeout);
 			map.from(poller).as(this::asTrigger).to(pollerMetadata::setTrigger);
+			customizers.orderedStream().forEach((customizer) -> customizer.customize(pollerMetadata));
 			return pollerMetadata;
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/PollerMetadataCustomizer.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2012-2025 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.integration;
+
+import org.springframework.integration.scheduling.PollerMetadata;
+
+/**
+ * Callback interface that can be implemented by beans wishing to customize the
+ * {@link PollerMetadata} whilst retaining default auto-configuration.
+ *
+ * @author Yanming Zhou
+ * @since 3.5.0
+ */
+@FunctionalInterface
+public interface PollerMetadataCustomizer {
+
+	/**
+	 * Customize the {@link PollerMetadata}.
+	 * @param pollerMetadata the {@code PollerMetadata} to customize
+	 */
+	void customize(PollerMetadata pollerMetadata);
+
+}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationTests.java

@@ -62,6 +62,8 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
 import org.springframework.core.task.SimpleAsyncTaskExecutor;
+import org.springframework.core.task.SyncTaskExecutor;
+import org.springframework.core.task.TaskExecutor;
 import org.springframework.integration.annotation.IntegrationComponentScan;
 import org.springframework.integration.annotation.MessagingGateway;
 import org.springframework.integration.annotation.ServiceActivator;
@@ -105,6 +107,7 @@ import static org.mockito.Mockito.mock;
  * @author Stephane Nicoll
  * @author Vedran Pavic
  * @author Yong-Hyun Kim
+ * @author Yanming Zhou
  */
 class IntegrationAutoConfigurationTests {
 
@@ -543,6 +546,19 @@ class IntegrationAutoConfigurationTests {
 					.usesVirtualThreads()));
 	}
 
+	@Test
+	void pollerMetadataCanBeCustomizedViaPollerMetadataCustomizer() {
+		TaskExecutor taskExecutor = new SyncTaskExecutor();
+		this.contextRunner.withUserConfiguration(PollingConsumerConfiguration.class)
+			.withBean(PollerMetadataCustomizer.class,
+					() -> (pollerMetadata) -> pollerMetadata.setTaskExecutor(taskExecutor))
+			.run((context) -> {
+				assertThat(context).hasSingleBean(PollerMetadata.class);
+				PollerMetadata metadata = context.getBean(PollerMetadata.DEFAULT_POLLER, PollerMetadata.class);
+				assertThat(metadata.getTaskExecutor()).isSameAs(taskExecutor);
+			});
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class CustomMBeanExporter {