Polish "Auto-configure SpringLiquibase with Liquibase Customizer"

See gh-40986

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/liquibase/LiquibaseAutoConfiguration.java

@@ -98,9 +98,9 @@ public class LiquibaseAutoConfiguration {
 		}
 
 		@Bean
-		public SpringLiquibase liquibase(ObjectProvider<DataSource> dataSource,
+		SpringLiquibase liquibase(ObjectProvider<DataSource> dataSource,
 				@LiquibaseDataSource ObjectProvider<DataSource> liquibaseDataSource, LiquibaseProperties properties,
-				ObjectProvider<Customizer<Liquibase>> customizer, LiquibaseConnectionDetails connectionDetails) {
+				ObjectProvider<SpringLiquibaseCustomizer> customizers, LiquibaseConnectionDetails connectionDetails) {
 			SpringLiquibase liquibase = createSpringLiquibase(liquibaseDataSource.getIfAvailable(),
 					dataSource.getIfUnique(), connectionDetails);
 			liquibase.setChangeLog(properties.getChangeLog());
@@ -128,7 +128,7 @@ public class LiquibaseAutoConfiguration {
 			if (properties.getUiService() != null) {
 				liquibase.setUiService(UIServiceEnum.valueOf(properties.getUiService().name()));
 			}
-			customizer.ifAvailable(liquibase::setCustomizer);
+			customizers.orderedStream().forEach((customizer) -> customizer.customize(liquibase));
 			return liquibase;
 		}
 
@@ -177,6 +177,17 @@ public class LiquibaseAutoConfiguration {
 
 	}
 
+	@ConditionalOnClass(Customizer.class)
+	static class CustomizerConfiguration {
+
+		@Bean
+		@ConditionalOnBean(Customizer.class)
+		SpringLiquibaseCustomizer customizerSpringLiquibaseCustomizer(Customizer<Liquibase> customizer) {
+			return (springLiquibase) -> springLiquibase.setCustomizer(customizer);
+		}
+
+	}
+
 	static final class LiquibaseDataSourceCondition extends AnyNestedCondition {
 
 		LiquibaseDataSourceCondition() {
@@ -243,4 +254,15 @@ public class LiquibaseAutoConfiguration {
 
 	}
 
+	@FunctionalInterface
+	private interface SpringLiquibaseCustomizer {
+
+		/**
+		 * Customize the given {@link SpringLiquibase} instance.
+		 * @param springLiquibase the instance to configure
+		 */
+		void customize(SpringLiquibase springLiquibase);
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/liquibase/LiquibaseAutoConfigurationTests.java

@@ -538,9 +538,7 @@ class LiquibaseAutoConfigurationTests {
 	@Test
 	void whenCustomizerBeanIsDefinedThenItIsConfiguredOnSpringLiquibase() {
 		this.contextRunner.withUserConfiguration(EmbeddedDataSourceConfiguration.class, CustomizerConfiguration.class)
-			.run(assertLiquibase((liquibase) -> {
-				assertThat(liquibase.getCustomizer()).isNotNull();
-			}));
+			.run(assertLiquibase((liquibase) -> assertThat(liquibase.getCustomizer()).isNotNull()));
 	}
 
 	private ContextConsumer<AssertableApplicationContext> assertLiquibase(Consumer<SpringLiquibase> consumer) {
@@ -684,7 +682,7 @@ class LiquibaseAutoConfigurationTests {
 
 		@Bean
 		Customizer<Liquibase> customizer() {
-			return liquibase -> liquibase.setChangeLogParameter("some key", "some value");
+			return (liquibase) -> liquibase.setChangeLogParameter("some key", "some value");
 		}
 
 	}

spring-boot-project/spring-boot-docs/src/docs/antora/modules/how-to/pages/data-initialization.adoc

@@ -187,6 +187,8 @@ If any of the three properties has not been set, the value of its equivalent `sp
 
 See xref:api:java/org/springframework/boot/autoconfigure/liquibase/LiquibaseProperties.html[`LiquibaseProperties`] for details about available settings such as contexts, the default schema, and others.
 
+You can also use a `Customizer<Liquibase>` bean if you want to customize the `Liquibase` instance before it is being used.
+
 
 
 [[howto.data-initialization.migration-tool.flyway-tests]]