GH-792 Fix Supplier streaming in s-c-function-web

Resolves #792

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

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		 xmlns="http://maven.apache.org/POM/4.0.0"
-		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	xmlns="http://maven.apache.org/POM/4.0.0"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<groupId>io.spring.sample</groupId>
@@ -26,9 +26,9 @@
 
 	<dependencies>
 		<dependency>
-    <groupId>org.springframework.boot</groupId>
-    <artifactId>spring-boot-starter-actuator</artifactId>
-</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>

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

@@ -0,0 +1,44 @@
+/*
+ * 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 com.example;
+
+import org.springframework.web.reactive.function.client.WebClient;
+
+/**
+ * Sample client to test infinite stream from function.
+ *
+ * @author Oleg Zhurakousky
+ *
+ */
+public class Client {
+
+	public static void main(String[] args) throws Exception {
+		WebClient client = WebClient.create();
+		WebClient.ResponseSpec responseSpec = client.post()
+			    .uri("http://localhost:8080/infinite")
+			    .header("accept", "text/event-stream")
+			    .retrieve();
+
+		responseSpec.bodyToFlux(String.class).subscribe(v -> {
+			System.out.println(v);
+		});
+
+		System.in.read();
+
+	}
+
+}

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

@@ -16,10 +16,12 @@
 
 package com.example;
 
+import java.time.Duration;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
 import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -55,9 +57,11 @@ public class SampleApplication {
 	}
 
 	@Bean
-	public Supplier<Flux<String>> words() {
-		return () -> Flux.fromArray(new String[] {"foo", "bar"});
+	public Supplier<Flux<String>> infinite() {
+	    return () -> Flux
+	            .interval(Duration.ofSeconds(1))
+	            .log()
+	            .map(counter -> String.format("Counter: %s", counter));
 	}
 
 }
-// @checkstyle:on

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

@@ -51,15 +51,6 @@ public class FunctionTests {
 		assertThat(output).isEqualTo("hello");
 	}
 
-	@Test
-	public void testWords() {
-		Flux<String> output = this.functions.words().get();
-		List<String> results = output.collectList().block();
-		assertThat(results.size()).isEqualTo(2);
-		assertThat(results.get(0)).isEqualTo("foo");
-		assertThat(results.get(1)).isEqualTo("bar");
-	}
-
 	@Test
 	public void testGreeter() {
 		assertThat(new Greeter().apply("World")).isEqualTo("Hello World");