🌄Scope | Coroutine

🔮 Neden Kullanılmalıdır

• 💫 Yaşam döngüsü olan sınıflarda tercih edilir

• ☠ Activity öldüğünde coroutine işlemleri devam eder

• 🎳 Devam eden işlemler gereksiz bellek kullanırlar (memory leak)

🛑 Manuel Durdurma

class Activity {
    private val mainScope = MainScope()
    
    fun destroy() {
        mainScope.cancel()
    }
// to be continued ...
}

🏗️ Scope Tanımlama

• ✋ Activity sonlandığında coroutine işlemleri de sonlanır

• 💁‍♂️ Gereksiz işlemler otomatik önlenir

• ✨ CoroutineScope by CoroutineScope(<dispathcer>) miras alınır

class Activity : CoroutineScope by CoroutineScope(Dispatchers.Default) {
    fun doSomething() {
        // launch ten coroutines for a demo, each working for a different time
        repeat(10) { i ->
            launch {
                delay((i + 1) * 200L) // variable delay 200ms, 400ms, ... etc
                println("Coroutine $i is done")
            }
        }
    }
} // class Activity ends

val activity = Activity()
activity.doSomething() // run test function
println("Launched coroutines")
delay(500L) // delay for half a second
println("Destroying activity!")
activity.destroy() // cancels all coroutines
delay(1000) // visually confirm that they don't work

/*
Launched coroutines
Coroutine 0 is done
Coroutine 1 is done
Destroying activity!
*/

🧐 Kaynaklar

Coroutine context and dispatchers | KotlinKotlin Help