RxJava Thread Switching like a Pro - Medium Article - 1

no-multi-threading.kt

/*
 * RxJava without any multi-threading
 */
 
println("Calling function : ${Thread.currentThread().id}")

val obs = Observable
    .just(1)
    .doOnNext {
        println("OnNext : Val = $it : Thread = ${Thread.currentThread().id}")
    }
    .map {
        println("Map : Val = $it : Thread = ${Thread.currentThread().id}")
        2
    }
    .doOnSubscribe {
        println("OnSubscribe : Thread = ${Thread.currentThread().id}")
    }
    .doOnNext {
        println("OnNext : Val = $it : Thread = ${Thread.currentThread().id}")
    }

val thread = Thread {
    println("Calling thread : Thread = ${Thread.currentThread().id}")
    obs.subscribe()
}

thread.start()

/*
 * End
 */