fun main() {

    Database().load("https://jsonplaceholder.typicode.com/users/1", object : Callback {
        override fun onLoadData(result: String) {
            Thread.sleep(2000) // imitation of long query
            println(result)
        }
    })
}


/*
*   Callback using via HighOrderFunctions / Unit
*   https://metanit.com/kotlin/tutorial/3.7.php
* */

class DatabaseUnit {
    fun load(link: String, callback: (Any) -> Unit) {
        val result = RequestHelper.getData(link)
        callback(result)
    }
}