class MainKotlinTest {
    @Test
    fun main() {
        println("Start")
        networkRequest()
            .subscribe { t ->
                println(t)
                saveDB(t).subscribe()
            }
        println("End")

        Thread.sleep(5000)
    }

    private fun <T> saveDB(data:T): Completable {
        return Completable.fromCallable {
            println("saveDB Start")
            Thread.sleep(2000)
            println("saveDB Success")
            println(data)
        }.subscribeOn(Schedulers.io())
    }

    private fun networkRequest(): Single<String> {
        return Single.fromCallable {
            println("networkRequest Start")
            Thread.sleep(2000)
            println("networkRequest Success")
            "RESULT REST"
        }.subscribeOn(Schedulers.io())
    }
}