Coroutines in Kotlin

Droid UP 6.0 Tbilisi, Gerorgia
Little about Kotlin and its new awesome feature Coroutines

Transcript

1. { Kotlin } Statically typed language for the JVM, Android and the browser. Developed by JetBrains
2. { Little about the language } • Null safety • Expressive • 100% java interoperability ------------------------------------------------- • Lambdas • ( map, filter, reduce ..) • Higher-order functions • Extensions • Automatic type inference • Inline functions • …..
3. { Coroutines } • NOT A THREAD !!! Is like • Lightweight threads • More like daemon threads • Programs that allows to run multiple program cooperatively
4. Behind the scene ExecutorService ThreadPoolExecutor Executors Thread pools …. + Kotlin implementation of pools, CoroutineDispatcher and etc • Write asynchronous code as it was synchronous • Avoid from callback hell • Run multiple async computations simultaneously(demo in example) • Less memory usage (compared to Threads) { Coroutines }
5. { Coroutines VS Threads } Coroutine - • It is stackless(doesn't have own stack) low memory usage • Doesn't map on native thread • Managed by user • Cooperatively multitasking (no context switch)
6. • Launch • Async • Future • Deferred • suspend • await { Coroutines }
7. { Coroutines } 1 start coroutine 2 var rawData = startSomeNetworkRequest.await() 3 var data = parseData(rawData).await() 4 diplayData(data)
8. Create 100 000 coroutine which runs simultaneously val jobs = List(100_100) { async(CommonPool) { delay(1000) 1 } } jobs.sumBy{ it.await() } { Coroutines }.example