GH-718 Improve support for Function bean definition

Added sample for functional bean definition

spring-cloud-function-samples/function-functional-sample-aws/src/main/java/example/FunctionConfiguration.java

@@ -0,0 +1,30 @@
+package example;
+
+import java.util.function.Function;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.cloud.function.context.FunctionRegistration;
+import org.springframework.cloud.function.context.FunctionType;
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.support.GenericApplicationContext;
+
+@SpringBootConfiguration
+public class FunctionConfiguration implements ApplicationContextInitializer<GenericApplicationContext> {
+
+	/*
+	 * You need this main method (empty) or explicit <start-class>example.FunctionConfiguration</start-class>
+	 * in the POM to ensure boot plug-in makes the correct entry
+	 */
+    public static void main(String[] args) {
+    	// empty unless using Custom runtime at which point it should include
+    	// FunctionalSpringApplication.run(FunctionConfiguration.class, args);
+    }
+
+    @Override
+    public void initialize(GenericApplicationContext context) {
+    	Function<String, String> function = (str) -> str + str.toUpperCase();
+    	context.registerBean("uppercase", FunctionRegistration.class,
+				() -> new FunctionRegistration<>(function).type(
+						FunctionType.from(String.class).to(String.class)));
+    }
+}

spring-cloud-function-samples/function-functional-sample-aws/src/main/resources/application.properties

@@ -0,0 +1,4 @@
+logging.level.org.springframework.cloud=DEBUG
+#spring.cloud.function.web.export.enabled=false
+#spring.main.web-application-type=none
+#spring.functional.enabled=true

spring-cloud-function-samples/function-functional-sample-aws/src/main/resources/log4j.properties

@@ -0,0 +1,20 @@
+log4j.rootCategory=DEBUG, LAMBDA
+PID=????
+LOG_LEVEL_PATTERN=%5p
+LOG_PATTERN=[%d{yyyy-MM-dd HH:mm:ss.SSS}] boot%X{context} - ${PID} ${LOG_LEVEL_PATTERN} [%t] --- %c{1}: %m%n
+# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
+log4j.appender.LAMBDA=com.amazonaws.services.lambda.runtime.log4j.LambdaAppender
+log4j.appender.LAMBDA.layout=org.apache.log4j.PatternLayout
+log4j.appender.LAMBDA.layout.conversionPattern=${LOG_PATTERN}
+log4j.category.org.apache.catalina.startup.DigesterFactory=ERROR
+log4j.category.org.apache.catalina.util.LifecycleBase=ERROR
+log4j.category.org.apache.coyote.http11.Http11NioProtocol=WARN
+log4j.category.org.apache.sshd.common.util.SecurityUtils
+log4j.category.org.apache.tomcat.util.net.NioSelectorPool=WARN
+log4j.category.org.crsh.plugin=WARN
+log4j.category.org.crsh.ssh=WARN
+log4j.category.org.eclipse.jetty.util.component.AbstractLifeCycle=ERROR
+log4j.category.org.hibernate.validator.internal.util.Version=WARN
+log4j.category.org.springframework.boot.actuate.autoconfigure.CrshAutoConfiguration=WARN
+log4j.category.org.springframework.boot.actuate.endpoint.jmx=WARN
+log4j.category.org.thymeleaf=WARN

spring-cloud-function-samples/function-functional-sample-aws/src/test/java/example/MapTests.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2012-2019 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 example;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class MapTests {
+
+	@Test
+	public void test() {
+
+	}
+}