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

Resolves #792

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