Coroutines and Asynchronous Programming (BlrKotlin)

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Rivu Chakraborty Coroutines & Asynchronous Programming 1 https://www.rivu.dev

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Rivu Chakraborty BYJU’S @rivuchakraborty Coroutines & Asynchronous Programming 2 https://www.rivu.dev

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Rivu Chakraborty BYJU’S @rivuchakraborty About Me ● Sr Software Engineer (Android) - BYJU’S ● Instructor - Caster.io ● Google Certified Associate Android Developer ● DroidJam Speaker ● Author - Reactive Programming in Kotlin ● Author - Functional Kotlin ● Author - Hands on Data Structures and Algorithms with Kotlin ● Author - Coroutines for Android Developers (WIP) 3 https://www.rivu.dev

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https://www.rivu.dev

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Books https://www.packtpub.com/a pplication-development/react ive-programming-kotlin https://www.packtpub.com/a pplication-development/funct ional-kotlin https://leanpub.com/coroutines-f or-android-developers Work in Progress https://www.packtpub.com/appl ication-development/hands-dat a-structures-and-algorithms-ko tlin

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Coroutines & Asynchronous Programming Async => Concurrency

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Coroutines & Asynchronous Programming Concurrency ⇏ Parallel

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Concurrency ● Ability to execute multiple code blocks at the same time @rivuchakraborty https://www.rivu.dev

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Concurrency ● Ability to execute multiple code blocks at the same time ● Not only for Android Developers @rivuchakraborty https://www.rivu.dev

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Concurrency ● Ability to execute multiple code blocks at the same time ● Not only for Android Developers ● JavaScript - Promise ● JVM, Android - Threads (Fibers) ● Native (LLVM) - Pure Kotlin @rivuchakraborty https://www.rivu.dev

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11 Concurrency in Android ● AsyncTask ● CompletableFuture ● Runnable / Thread (Custom Threadpool) ● Rx ● Counting... @rivuchakraborty https://www.rivu.dev

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12 Concurrency in Android ● Coroutines @rivuchakraborty https://www.rivu.dev Let’s you write non-blocking asynchronous code in your choice of Style - Sequentially, in Functional Style or whatever you prefer.

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Coroutines 13 @rivuchakraborty https://www.rivu.dev Light-Weight Threads Thread 1 Thread 2 Thread 3 Coroutine 1 Coroutine 2 Coroutine 3 With Coroutines, Threads are still used (for JVM).

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Coroutines 14 @rivuchakraborty https://www.rivu.dev Light-Weight Threads Thread 1 Thread 2 Thread 3 Coroutine 1 Coroutine 2 C 3 C 4 C 5 C 6 C 7 C 8 C N But a single Thread (Fiber) can run multiple coroutines.

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Coroutines 15 @rivuchakraborty https://www.rivu.dev Easy to Use

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Suspension & Continuation Builders Suspending Functions Done Coroutines Components Scope & Dispatchers @rivuchakraborty https://www.rivu.dev 16

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Coroutines 17 @rivuchakraborty https://www.rivu.dev Suspending vs Blocking

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18 @rivuchakraborty https://www.rivu.dev Suspending vs Blocking

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19 @rivuchakraborty https://www.rivu.dev Suspending vs Blocking

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Launch a Coroutine 20 @rivuchakraborty https://www.rivu.dev

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Get the Job done or cancel it, your choice. :) 21 @rivuchakraborty https://www.rivu.dev

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Compute Async(hrounously) 22 @rivuchakraborty https://www.rivu.dev

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Deferred 23 @rivuchakraborty https://www.rivu.dev ● Deferred Extends Job ● Wrapper around your data

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Suspending Function 24 @rivuchakraborty https://www.rivu.dev ● suspend is a Keyword in Kotlin

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Suspending Function 25 @rivuchakraborty https://www.rivu.dev ● suspend is a Keyword in Kotlin ● Compiler level restriction - can’t call suspend function outside CoroutineScope

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Suspending Function 26 @rivuchakraborty https://www.rivu.dev ● suspend is a Keyword in Kotlin ● Compiler level restriction - can’t call suspend function outside CoroutineScope ● Suspends execution of current coroutine, until the function is completed

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Coroutine Scope 27 @rivuchakraborty https://www.rivu.dev ● Container of CoroutineContext

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Coroutine Scope 28 @rivuchakraborty https://www.rivu.dev ● Container of CoroutineContext ● Every Coroutine Builder is an extension over CoroutineScope, and thus inherits its CoroutineContext

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Coroutine Scope 29 @rivuchakraborty https://www.rivu.dev ● Container of CoroutineContext ● Every Coroutine Builder is an extension over CoroutineScope, and thus inherits its CoroutineContext ● All Coroutines must be launched within a CoroutineScope

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Coroutine Scope 30 @rivuchakraborty https://www.rivu.dev

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Coroutine Context 31 @rivuchakraborty https://www.rivu.dev ● Holds key informations about the Coroutine such as Dispatcher / ThreadPool Configuration, Coroutine Name etc.

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Dispatchers 32 @rivuchakraborty https://www.rivu.dev ● Determines which Thread / ThreadPool, the coroutine will run on.

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Dispatchers 33 @rivuchakraborty https://www.rivu.dev ● Determines which Thread / ThreadPool, the coroutine will run on. ● Similar to the Rx Schedulers

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Let’s Build for Android

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Repository 35 @rivuchakraborty https://www.rivu.dev

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API (Retrofit) 36 @rivuchakraborty https://www.rivu.dev

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Activity 37 @rivuchakraborty https://www.rivu.dev

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Call it 38 @rivuchakraborty https://www.rivu.dev

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Handle Exception (Gracefully) :D 39 @rivuchakraborty https://www.rivu.dev

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Rivu Chakraborty, BYJU’S @rivuchakraborty https://www.rivu.dev Resources https://caster.io/courses/kotlin-co routines-fundamentals ● http://bit.ly/CodeLabCoroutines ● http://bit.ly/CoroutinesAndroid ● http://bit.ly/DroidCoroutines ● http://bit.ly/CoroutinesGuide 40

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Thank you! 41 Rivu Chakraborty, BYJU’S @rivuchakraborty https://www.rivu.dev