Breaking News: Grepper is joining You.com. Read the official announcement!

Let’s define functions

Add Answer

Sumit Rawal answered on May 15, 2023 Popularity 1/10 Helpfulness 1/10

answer Let’s define functions

Let’s define functions

Comment

Here, I am using the same application as both producer and consumer for the convenience of the demo.

fizzBuzzProducer is the producer which will generate the random number within range for every 5 seconds.

fizzBuzzProcessor is the processor just like middleware, the number generated by the producer. This acts as a consumer from the previously produced message and processes the logic of fizzBuzz logic and published to another topic.

fizzBuzzConsumer will consume the message that is published by the processor and prints out in the console.

The use case seems simple, my intention is to show who Java Functional Programming can be used to define producers, consumers in Spring boot application of course multiple topics.

import lombok.extern.slf4j.Slf4j;
import reactor.core.publisher.Flux;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.time.Duration;
import java.util.Random;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;

/**
 * Created on 25/August/2021 By Author Eresh, Gorantla
 **/
@Configuration
@Slf4j
public class KafkaConfiguration {

	Random random = new Random();

	@Bean
	public Supplier<Flux<Integer>> fizzBuzzProducer(){
		return () -> Flux.interval(Duration.ofSeconds(5)).map(value -> random.nextInt(1000 - 1) + 1).log();
	}

	@Bean
	public Function<Flux<Integer>, Flux<String>> fizzBuzzProcessor(){
		return longFlux -> longFlux
				.map(i -> evaluateFizzBuzz(i))
				.log();
	}

	@Bean
	public Consumer<String> fizzBuzzConsumer(){
		return (value) -> log.info("Consumer Received : " + value);
	}

	private String evaluateFizzBuzz(Integer value) {
		if (value % 15 == 0) {
			return "FizzBuzz";
		} else if (value % 5 == 0) {
			return "Buzz";
		} else if (value % 3 == 0) {
			return "Fizz";
		} else {
			return String.valueOf(value);
		}
	}

}

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

Link to this answer
Share Copy Link

Contributed on May 15 2023

Sumit Rawal

0 Answers Avg Quality 2/10

Let’s define functions

Contents

More Related Answers

Let’s define functions

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.