add Function compiling webapp and update scripts

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

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+/*
+ * Copyright 2017 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
+ *
+ *      http://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 com.example;
+
+import java.util.function.Function;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.cloud.function.compiler.FunctionCompiler;
+import org.springframework.cloud.function.compiler.proxy.LambdaCompilingFunction;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.io.ByteArrayResource;
+
+import reactor.core.publisher.Flux;
+
+@SpringBootApplication
+@EnableConfigurationProperties(FunctionProperties.class)
+public class SampleApplication {
+
+	@Autowired
+	private FunctionProperties properties;
+
+	@Bean
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	public Function<Flux<String>, Flux<String>> function(FunctionCompiler<?, ?> compiler) {
+		ByteArrayResource resource = new ByteArrayResource(properties.getLambda().getBytes());
+		return new LambdaCompilingFunction(resource, compiler);
+	}
+
+	@Bean
+	public FunctionCompiler<?, ?> compiler() {
+		return new FunctionCompiler<>();
+	}
+
+	public static void main(String[] args) throws Exception {
+		SpringApplication.run(SampleApplication.class, args);
+	}
+}
+
+@ConfigurationProperties("function")
+class FunctionProperties {
+
+	private String lambda;
+
+	public String getLambda() {
+		return lambda;
+	}
+
+	public void setLambda(String lambda) {
+		this.lambda = lambda;
+	}
+}

spring-cloud-function-samples/spring-cloud-function-sample-compiler/src/test/java/com/example/SampleApplicationTests.java

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+/*
+ * Copyright 2017 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
+ *
+ *      http://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 com.example;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.context.embedded.LocalServerPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Mark Fisher
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT,
+		properties = "function.lambda=f->f.map(s->s.toString().toLowerCase())")
+public class SampleApplicationTests {
+
+	@LocalServerPort
+	private int port;
+
+	@Test
+	public void lowercase() {
+		assertThat(new TestRestTemplate().postForObject(
+				"http://localhost:" + port + "/function", "{\"VALUE\":\"FOO\"}",
+				String.class)).isEqualTo("{\"value\":\"foo\"}");
+	}
+
+}