Avoid eager initialization when configuring Data repository metrics

Fixes gh-26630

Author: wilkinsona

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/data/MetricsRepositoryMethodInvocationListenerBeanPostProcessor.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.data;
 
+import java.util.function.Supplier;
+
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.boot.actuate.metrics.data.MetricsRepositoryMethodInvocationListener;
@@ -33,8 +35,9 @@ class MetricsRepositoryMethodInvocationListenerBeanPostProcessor implements Bean
 
 	private final RepositoryFactoryCustomizer customizer;
 
-	MetricsRepositoryMethodInvocationListenerBeanPostProcessor(MetricsRepositoryMethodInvocationListener listener) {
-		this.customizer = (repositoryFactory) -> repositoryFactory.addInvocationListener(listener);
+	MetricsRepositoryMethodInvocationListenerBeanPostProcessor(
+			Supplier<MetricsRepositoryMethodInvocationListener> listener) {
+		this.customizer = new MetricsRepositoryFactoryCustomizer(listener);
 	}
 
 	@Override
@@ -45,4 +48,25 @@ public Object postProcessBeforeInitialization(Object bean, String beanName) thro
 		return bean;
 	}
 
+	private static final class MetricsRepositoryFactoryCustomizer implements RepositoryFactoryCustomizer {
+
+		private final Supplier<MetricsRepositoryMethodInvocationListener> listenerSupplier;
+
+		private volatile MetricsRepositoryMethodInvocationListener listener;
+
+		private MetricsRepositoryFactoryCustomizer(
+				Supplier<MetricsRepositoryMethodInvocationListener> listenerSupplier) {
+			this.listenerSupplier = listenerSupplier;
+		}
+
+		@Override
+		public void customize(RepositoryFactorySupport repositoryFactory) {
+			if (this.listener == null) {
+				this.listener = this.listenerSupplier.get();
+			}
+			repositoryFactory.addInvocationListener(this.listener);
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/data/RepositoryMetricsAutoConfiguration.java

@@ -18,6 +18,7 @@
 
 import io.micrometer.core.instrument.MeterRegistry;
 
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.actuate.autoconfigure.metrics.CompositeMeterRegistryAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.MetricsProperties;
@@ -72,9 +73,9 @@ public MetricsRepositoryMethodInvocationListener metricsRepositoryMethodInvocati
 
 	@Bean
 	public static MetricsRepositoryMethodInvocationListenerBeanPostProcessor metricsRepositoryMethodInvocationListenerBeanPostProcessor(
-			MetricsRepositoryMethodInvocationListener metricsRepositoryMethodInvocationListener) {
+			ObjectProvider<MetricsRepositoryMethodInvocationListener> metricsRepositoryMethodInvocationListener) {
 		return new MetricsRepositoryMethodInvocationListenerBeanPostProcessor(
-				metricsRepositoryMethodInvocationListener);
+				metricsRepositoryMethodInvocationListener::getObject);
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/data/MetricsRepositoryMethodInvocationListenerBeanPostProcessorTests.java

@@ -38,7 +38,7 @@ class MetricsRepositoryMethodInvocationListenerBeanPostProcessorTests {
 	private MetricsRepositoryMethodInvocationListener listener = mock(MetricsRepositoryMethodInvocationListener.class);
 
 	private MetricsRepositoryMethodInvocationListenerBeanPostProcessor postProcessor = new MetricsRepositoryMethodInvocationListenerBeanPostProcessor(
-			this.listener);
+			() -> this.listener);
 
 	@Test
 	@SuppressWarnings("rawtypes")

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/data/RepositoryMetricsAutoConfigurationTests.java

@@ -24,6 +24,7 @@
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.Tag;
 import io.micrometer.core.instrument.Timer;
+import io.micrometer.core.instrument.binder.MeterBinder;
 import io.micrometer.core.instrument.distribution.HistogramSnapshot;
 import org.junit.jupiter.api.Test;
 
@@ -125,6 +126,13 @@ void timerWorksWithTimedAnnotationsWhenAutoTimeRequestsIsFalse() {
 				});
 	}
 
+	@Test
+	void doesNotTriggerEarlyInitializationThatPreventsMeterBindersFromBindingMeters() {
+		this.contextRunner.withUserConfiguration(MeterBinderConfiguration.class)
+				.run((context) -> assertThat(context.getBean(MeterRegistry.class).find("binder.test").counter())
+						.isNotNull());
+	}
+
 	private MeterRegistry getInitializedMeterRegistry(AssertableApplicationContext context,
 			Class<?> repositoryInterface) {
 		MetricsRepositoryMethodInvocationListener listener = context
@@ -158,6 +166,16 @@ public Iterable<Tag> repositoryTags(RepositoryMethodInvocation invocation) {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	static class MeterBinderConfiguration {
+
+		@Bean
+		MeterBinder meterBinder() {
+			return (registry) -> registry.counter("binder.test");
+		}
+
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class MetricsRepositoryMethodInvocationListenerConfiguration {