Revert "GH-1267 Remove RSocket sample"

This reverts commit 110f7619fd.

spring-cloud-function-samples/function-sample-cloudevent-rsocket/src/main/java/io/spring/cloudevent/DemoApplication.java

@@ -0,0 +1,28 @@
+package io.spring.cloudevent;
+
+import java.util.function.Consumer;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.function.cloudevent.CloudEventMessageBuilder;
+import org.springframework.cloud.stream.function.StreamBridge;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) throws Exception {
+	    SpringApplication.run(DemoApplication.class, args);
+	}
+
+	@Bean
+	public Consumer<Person> hire(StreamBridge streamBridge) {
+		return person -> {
+			Employee employee = new Employee(person);
+			streamBridge.send("hire-out-0", CloudEventMessageBuilder.withData(employee)
+				.setSource("http://spring.io/rsocket")
+				.setId("1234567890")
+				.build());
+		};
+	}
+}

spring-cloud-function-samples/function-sample-cloudevent-rsocket/src/main/java/io/spring/cloudevent/Employee.java

@@ -0,0 +1,41 @@
+package io.spring.cloudevent;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Random;
+
+public class Employee {
+
+	private Person person;
+
+	private int id;
+
+	public Employee() {
+
+	}
+
+	public Employee(Person person) {
+		this.person = person;
+		this.id = new Random().nextInt(1000);
+	}
+
+	public Person getPerson() {
+		return person;
+	}
+
+	public void setPerson(Person person) {
+		this.person = person;
+	}
+
+	public int getId() {
+		return id;
+	}
+
+	public void setId(int id) {
+		this.id = id;
+	}
+
+	public String getMessage() {
+		return "Employee " + id + " was hired on " + new SimpleDateFormat("dd-MM-yyyy").format(new Date());
+	}
+}

spring-cloud-function-samples/function-sample-cloudevent-rsocket/src/main/java/io/spring/cloudevent/Person.java

@@ -0,0 +1,24 @@
+package io.spring.cloudevent;
+
+public class Person {
+
+	private String firstName;
+
+	private String lastName;
+
+	public String getLastName() {
+		return lastName;
+	}
+
+	public void setLastName(String lastName) {
+		this.lastName = lastName;
+	}
+
+	public String getFirstName() {
+		return firstName;
+	}
+
+	public void setFirstName(String firstName) {
+		this.firstName = firstName;
+	}
+}

spring-cloud-function-samples/function-sample-cloudevent-rsocket/src/test/java/io/spring/cloudevent/DemoApplicationTests.java

@@ -0,0 +1,83 @@
+package io.spring.cloudevent;
+
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.kafka.clients.admin.KafkaAdminClient;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ConditionEvaluationResult;
+import org.junit.jupiter.api.extension.ExecutionCondition;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cloud.function.cloudevent.CloudEventMessageUtils;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.rsocket.RSocketRequester;
+import org.springframework.util.MimeTypeUtils;
+
+
+@SpringBootTest(properties = {"spring.rsocket.server.port=55551"})
+@ExtendWith(DemoApplicationTests.TestRule.class)
+public class DemoApplicationTests {
+
+	ArrayBlockingQueue<Message<String>> queue = new ArrayBlockingQueue<>(1000);
+
+	@Autowired
+	private RSocketRequester.Builder rsocketRequesterBuilder;
+
+	@Test
+	public void test() throws Exception {
+		String payload = "{\n" +
+				"    \"specversion\" : \"1.0\",\n" +
+				"    \"type\" : \"org.springframework\",\n" +
+				"    \"source\" : \"https://spring.io/\",\n" +
+				"    \"id\" : \"A234-1234-1234\",\n" +
+				"    \"datacontenttype\" : \"application/json\",\n" +
+				"    \"data\" : {\n" +
+				"        \"firstName\" : \"John\",\n" +
+				"        \"lastName\" : \"Doe\"\n" +
+				"    }\n" +
+				"}";
+
+		this.rsocketRequesterBuilder.tcp("localhost", 55551)
+			.route("hire")
+			.metadata("{\"content-type\":\"application/cloudevents+json\"}", MimeTypeUtils.APPLICATION_JSON)
+			.data(payload)
+			.send()
+			.subscribe();
+
+		Message<String> resultFromKafka = queue.poll(2000, TimeUnit.MILLISECONDS);
+		System.out.println("Result Message: " + resultFromKafka);
+		System.out.println("Cloud Event 'specversion': " + CloudEventMessageUtils.getSpecVersion(resultFromKafka));
+		System.out.println("Cloud Event 'source': " + CloudEventMessageUtils.getSource(resultFromKafka));
+		System.out.println("Cloud Event 'id': " + CloudEventMessageUtils.getId(resultFromKafka));
+		System.out.println("Cloud Event 'type': " + CloudEventMessageUtils.getType(resultFromKafka));
+	}
+
+	@KafkaListener(id = "test", topics = "hire-out-0", clientIdPrefix = "cloudEvents")
+    public void listen(Message<String> message) {
+		queue.add(message);
+    }
+
+	public static class TestRule implements ExecutionCondition {
+		@Override
+		public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
+			try {
+				Socket socket = new Socket();
+				socket.connect(new InetSocketAddress("localhost", 9092));
+				socket.close();
+			}
+			catch (Exception e) {
+				System.out.println("Kafka is not available on localhost:9092");
+				return ConditionEvaluationResult.disabled("Kafka is not available on localhost, default port");
+			}
+
+			return ConditionEvaluationResult.enabled("All is good");
+		}
+	}
+}