dependencies {
  implementation 'org.springframework.boot:spring-boot-starter-data-redis'
  implementation 'org.springframework.boot:spring-boot-starter-web'
  implementation 'com.github.sonus21:rqueue-spring-boot-starter:2.0.0-RELEASE'
  compileOnly 'org.projectlombok:lombok'
  annotationProcessor 'org.projectlombok:lombok'
  providedRuntime 'org.springframework.boot:spring-boot-starter-tomcat'
  testImplementation('org.springframework.boot:spring-boot-starter-test') {
    exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
  }
}

@SpringBootApplication
@EnableRedisRepositories
@EnableWebMvc
public class AsynchronousTaskExecutorApplication {
  public static void main(String[] args) {
    SpringApplication.run(AsynchronousTaskExecutorApplication.class, args);
  }
}

@Component
@Slf4j
public class MessageListener {
  @RqueueListener(value = "${email.queue.name}") (1)
  public void sendEmail(Email email) {
    log.info("Email {}", email);
  }
  @RqueueListener(value = "${invoice.queue.name}") (2)
  public void generateInvoice(Invoice invoice) {
    log.info("Invoice {}", invoice);
  }
}

import lombok.Data;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Invoice {
  private String id;
  private String type;
}

import lombok.Data;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Email {
  private String email;
  private String subject;
  private String content;
}

@RestController
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
@Slf4j
public class Controller {
  private @NonNull RqueueMessageSender rqueueMessageSender;
  @Value("${email.queue.name}")
  private String emailQueueName;
  @Value("${invoice.queue.name}")
  private String invoiceQueueName;
  @Value("${invoice.queue.delay}")
  private Long invoiceDelay;
  @GetMapping("email")
  public String sendEmail(
      @RequestParam String email, @RequestParam String subject, @RequestParam String content) {
    log.info("Sending email");
    rqueueMessageSender.enqueu(emailQueueName, new Email(email, subject, content));
    return "Please check your inbox!";
  }
  @GetMapping("invoice")
  public String generateInvoice(@RequestParam String id, @RequestParam String type) {
    log.info("Generate invoice");
    rqueueMessageSender.enqueueIn(invoiceQueueName, new Invoice(id, type), invoiceDelay);
    return "Invoice would be generated in " + invoiceDelay + " milliseconds";
  }
}

email.queue.name=email-queue
invoice.queue.name=invoice-queue
# 30 seconds delay for invoice
invoice.queue.delay=300000