Asynchronous Programming with Kotlin

Asynchronous Programming with Kotlin

• 1.
  Asynchronous programming Hadi Hariri
• 3.
  Approaches
• 4.
  Threading
• 5.
  Threading • Complex -state mutations, UI threads, debugging • Unviable - single threaded environments • Limited - underlying operating system • Expensive - context switches
• 6.
  Callbacks
• 7.
  Callbacks • Complex -Error handling • Unreadable - Callback Hell { { { { { { } } } } } }
• 8.
  Promises and Futures
• 9.
  Promises and Futures •Complex - error handling can be complicated • Paradigm - new ways of combining, learning new combinators, etc.
• 10.
  Reactive Extensions interface Observable<outT> {
 fun Subscribe(observer: Observer<T>)
 } interface Observer<in T> {
 fun onNext(t: T) fun onError(e: Exception) fun onCompleted()
 }

• 11.
  Reactive Extensions • Paradigm- new ways of combining, learning new combinators, etc. Everything is a stream. And it’s observable.
• 12.
  Kotlin Coroutines
• 13.
  Do async, thesame way you’d do sync
• 14.
  In essence… • Sameway of thinking for sync and async • Same way of doing things (exception handling, loops, etc.) • Same constructs
• 15.
  Coroutines • Suspendable Computation •A function can be suspended, and later resumed • Co-operative multitasking a.k.a. non-preemptive • State machine with CPS • Lightweight threads
• 16.
  How they look explicitcoroutine context 1 2 3 suspending function natural signature
• 17.
  How they work callback Kotlin Java/JVM
• 18.
  How they’re implemented Kotlin Java/JVM
• 19.
  Let’s see somecode!
• 20.
  Thank you!