SumNumbersConfiguration.kt

@Configuration
class SumNumbersConfiguration {

    @Bean
    fun generateNumbers(): Supplier<Message<String>> = Supplier<Message<String>> {
        val randomNumber1 = Random.nextInt(100)
        val randomNumber2 = Random.nextInt(100)

        print("$randomNumber1+$randomNumber2=")

        MessageBuilder.withPayload(
            "$randomNumber1,$randomNumber2"
        ).build()
    }

    @Bean
    fun sumNumbers(): Consumer<Message<*>> = Consumer<Message<*>> { message ->
           val decodedMessage = (message.payload as ByteArray).decodeToString()

           println(
               decodedMessage.split(",")
               .fold(0) { total, item -> total + item.toInt() }
           )
        }

}