GH-1014 Fix CustomRuntimeEventLoop to default to RoutingFunction

Resolves #1014

spring-cloud-function-samples/function-sample-aws-native/Dockerfile

@@ -40,7 +40,4 @@ RUN ln -s /usr/lib/gradle/bin/gradle /usr/bin/gradle
 
 ENV JAVA_HOME /usr/lib/graalvm
 
-ENTRYPOINT ["sh"]
-COPY . /home
-WORKDIR /home
-ENTRYPOINT ["sh"]
+WORKDIR /function-sample-aws-native

spring-cloud-function-samples/function-sample-aws-native/README.md

@@ -1,3 +1,9 @@
+# Introduction
+
+This example shows GraaalVM native spring-cloud-function application. The application itself is very simple and contains two functions - `uppercase` & `lowercase`.
+Unless specific value is specified as `handler`, the application will fall back on `RoutingFunction` where you can pass the routing instruction 
+via `spring.cloud.function.definition` Message header. If using API Gateway you can pass such header as HTTP header.
+
 # To run
 
 ## If you are on OSX Apple M1 Pro (arch64)
@@ -11,7 +17,7 @@ $ docker build -t "al2-graalvm19:native-uppercase" .
 Start the container
 
 ```
-$ docker run -dit al2-graalvm19:native-uppercase
+$ docker run -dit -v `pwd`:`pwd` -w `pwd` -v ~/.m2:/root/.m2 al2-graalvm19:native-uppercase
  ```
  
 Now navigate to the image terminal. Your working directory is alredy set for the root of the project. You can verify it by executing `ls`.

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

@@ -148,5 +148,40 @@
 			</plugin>
 		</plugins>
 	</build>
+	
+	<repositories>
+		<repository>
+			<id>spring-snapshots</id>
+			<name>Spring Snapshots</name>
+			<url>https://repo.spring.io/snapshot</url>
+		</repository>
+		<repository>
+			<id>spring-milestones</id>
+			<name>Spring Milestones</name>
+			<url>https://repo.spring.io/milestone</url>
+		</repository>
+		<repository>
+			<id>spring-releases</id>
+			<name>Spring Releases</name>
+			<url>https://repo.spring.io/release</url>
+		</repository>
+	</repositories>
+	<pluginRepositories>
+		<pluginRepository>
+			<id>spring-snapshots</id>
+			<name>Spring Snapshots</name>
+			<url>https://repo.spring.io/snapshot</url>
+		</pluginRepository>
+		<pluginRepository>
+			<id>spring-milestones</id>
+			<name>Spring Milestones</name>
+			<url>https://repo.spring.io/milestone</url>
+		</pluginRepository>
+		<pluginRepository>
+			<id>spring-releases</id>
+			<name>Spring Releases</name>
+			<url>https://repo.spring.io/release</url>
+		</pluginRepository>
+	</pluginRepositories>
 
 </project>

spring-cloud-function-samples/function-sample-aws-native/src/assembly/native.xml

@@ -22,7 +22,7 @@
 			<useDefaultExcludes>true</useDefaultExcludes>
 			<fileMode>0775</fileMode>
 			<includes>
-				<include>native-uppercase</include>
+				<include>function-sample-aws-native</include>
 			</includes>
 		</fileSet>
 	</fileSets>

spring-cloud-function-samples/function-sample-aws-native/src/main/java/com/example/demo/NativeUppercaseApplication.java

@@ -2,17 +2,35 @@ package com.example.demo;
 
 import java.util.function.Function;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.function.context.DefaultMessageRoutingHandler;
+import org.springframework.cloud.function.context.MessageRoutingCallback;
 import org.springframework.context.annotation.Bean;
+import org.springframework.messaging.Message;
 
 @SpringBootApplication
 public class NativeUppercaseApplication {
 
+	Log logger = LogFactory.getLog(NativeUppercaseApplication.class);
+
 	public static void main(String[] args) {
 		SpringApplication.run(NativeUppercaseApplication.class, args);
 	}
-	
+
+	@Bean
+	public MessageRoutingCallback customRouter() {
+		return new MessageRoutingCallback() {
+			@Override
+			public String routingResult(Message<?> message) {
+				logger.info("Received message: " + message);
+				return (String) message.getHeaders().get("spring.cloud.function.definition");
+			}
+		};
+	}
+
 	@Bean
 	public Function<String, String> uppercase() {
 		return v -> {
@@ -21,4 +39,12 @@ public class NativeUppercaseApplication {
 		};
 	}
 
+	@Bean
+	public Function<String, String> lowercase() {
+		return v -> {
+			System.out.println("Lowercasing " + v);
+			return v.toUpperCase();
+		};
+	}
+
 }

spring-cloud-function-samples/function-sample-aws-native/src/shell/native/bootstrap

@@ -2,4 +2,4 @@
 
 cd ${LAMBDA_TASK_ROOT:-.}
 
-./native-uppercase -Dlogging.level.org.springframework=DEBUG
+./function-sample-aws-native -Dlogging.level.org.springframework=DEBUG