Add stream (kafka, Rabbit) and Rsocket examples for Cloud Event

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

@@ -0,0 +1,77 @@
+package io.spring.cloudevent;
+
+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;
+
+
+@SpringBootTest(properties = {"spring.rsocket.server.port=55555"})
+@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", 55555)
+			.route("hire")
+			.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 {
+				KafkaAdminClient.create(Collections.singletonMap("bootstrap.servers", "localhost:9092"));
+			}
+			catch (Exception e) {
+				System.out.println("Kafka is not available on localhost:9092");
+				return ConditionEvaluationResult.enabled("Kafka is not available on localhost, default port");
+			}
+
+			return ConditionEvaluationResult.enabled("All is good");
+		}
+	}
+}