GH-766 Initial support to expose FunctionCatalog as actuator endpoint

spring-cloud-function-samples/function-sample/pom.xml

@@ -26,6 +26,10 @@
 
 	<dependencies>
 		<dependency>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-actuator</artifactId>
+</dependency>
+		<dependency>
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-starter-function-webflux</artifactId>
 		</dependency>

spring-cloud-function-samples/function-sample/src/main/java/com/example/SampleApplication.java

@@ -24,13 +24,14 @@ import reactor.core.publisher.Flux;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
+import org.springframework.messaging.Message;
 
 // @checkstyle:off
 @SpringBootApplication
 public class SampleApplication {
 
 	public static void main(String[] args) throws Exception {
-		SpringApplication.run(SampleApplication.class, args);
+		SpringApplication.run(SampleApplication.class, "--management.endpoints.web.exposure.include=functions");
 	}
 
 	@Bean
@@ -38,6 +39,11 @@ public class SampleApplication {
 		return value -> value.toUpperCase();
 	}
 
+	@Bean
+	public Function<Message<String>, String> uppercaseMessage() {
+		return value -> value.getPayload().toUpperCase();
+	}
+
 	@Bean
 	public Function<Flux<String>, Flux<String>> lowercase() {
 		return flux -> flux.map(value -> value.toLowerCase());