Adding functions composition samples for both Kafka/Rabbit

multi-functions-samples/function-composition-rabbit/src/main/java/demo/FunctionCompositionDemoApplication.java

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+/*
+ * Copyright 2015-2019 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 demo;
+
+import java.util.function.Function;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class FunctionCompositionDemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(FunctionCompositionDemoApplication.class, args);
+	}
+
+	@Bean
+	public Function<String, String> uppercase() {
+		return v -> {
+			v =  v.toUpperCase();
+			System.out.println("Uppercase: " + v);
+			return v;
+		};
+	}
+
+	@Bean
+	public Function<String, String> echo() {
+		return v -> {
+			System.out.println("Echo: " + v);
+			return v;
+		};
+	}
+
+}

multi-functions-samples/function-composition-rabbit/src/main/resources/application.yml

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+spring:
+  cloud:
+    stream:
+      bindings:
+        uppercase|echo-in-0:
+          destination: uppercase-in
+      function:
+        definition: uppercase|echo

multi-functions-samples/function-composition-rabbit/src/test/java/demo/ModuleApplicationTests.java

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+/*
+ * Copyright 2015 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 demo;
+
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringBootTest(classes = FunctionCompositionDemoApplication.class)
+@WebAppConfiguration
+@DirtiesContext
+public class ModuleApplicationTests {
+
+	@Test
+	@Ignore
+	public void contextLoads() {
+	}
+
+}