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

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

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+package io.spring.cloudevent;
+
+import java.net.URI;
+import java.util.function.Function;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.function.cloudevent.CloudEventHeaderEnricher;
+import org.springframework.cloud.function.cloudevent.CloudEventMessageBuilder;
+import org.springframework.cloud.function.cloudevent.CloudEventMessageUtils;
+import org.springframework.context.annotation.Bean;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.support.MessageBuilder;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) throws Exception {
+	    SpringApplication.run(DemoApplication.class, args);
+	}
+
+	@Bean
+	public Function<Person, Employee> hire() {
+		return person -> {
+			Employee employee = new Employee(person);
+			return employee;
+		};
+	}
+
+	// uncomment while keeping the above POJO function
+//	@Bean
+//	public CloudEventHeaderEnricher cloudEventEnricher() {
+//		return messageBuilder -> messageBuilder.setSource("http://spring.io/cloudevent")
+//				.setType("sample").setId("987654");
+//	}
+
+	// uncomment while commenting the previous two beans
+//	@Bean
+//	public Function<Message<Person>, Message<Employee>> hire() {
+//		return message -> {
+//			Person person = message.getPayload();
+//			Employee employee = new Employee(person);
+//			return CloudEventMessageBuilder.withData(employee).setId("123456")
+//				.setSource(URI.create("https://spring.cloudevenets.sample")).build();
+//		};
+//	}
+}

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

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+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-stream/src/main/java/io/spring/cloudevent/Person.java

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+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-stream/src/main/resources/application.properties

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+spring.cloud.function.definition=hire
+spring.cloud.stream.bindings.hire-in-0.binder=rabbit
+spring.cloud.stream.bindings.hire-out-0.binder=kafka