Efficient Async Coding in Kotlin Coroutines

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Rivu Chakraborty Efficient Async Coding in Kotlin Coroutines

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Rivu Chakraborty BYJU’S @rivuchakraborty Efficient Async Coding in Kotlin Coroutines

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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 - Coroutines for Android Developers (WIP)

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@rivuchakraborty

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Books https://www.packtpub.com/application-d evelopment/reactive-programming-kotlin https://www.packtpub.com/application-de velopment/functional-kotlin https://leanpub.com/coroutines-for-andr oid-developers Work in Progress

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Efficient Async Coding in Kotlin Coroutines Async => Concurrency

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Concurrency ● Ability to execute multiple code blocks at the same time @rivuchakraborty #DevFestAhm

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Concurrency ● Ability to execute multiple code blocks at the same time ● Not only for Android Developers @rivuchakraborty #DevFestAhm

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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 @rivuchakraborty #DevFestAhm

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10 Concurrency in Android ● AsyncTask ● CompletableFuture ● Runnable / Thread (Custom Threadpool) ● Rx ● Counting... @rivuchakraborty #DevFestAhm

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11 Concurrency in Android ● AsyncTask @rivuchakraborty #DevFestAhm

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12 Concurrency in Android ● CompletableFuture @rivuchakraborty #DevFestAhm

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13 Concurrency in Android ● Runnable / Thread @rivuchakraborty #DevFestAhm

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14 Concurrency in Android ● Rx @rivuchakraborty #DevFestAhm

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15 Concurrency in Android ● Coroutines @rivuchakraborty #DevFestAhm 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 16 @rivuchakraborty #DevFestAhm 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 17 @rivuchakraborty #DevFestAhm 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 Coroutine can run multiple coroutines.

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Coroutines 18 @rivuchakraborty #DevFestAhm Easy to Use

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Suspension & Continuation Builders Suspending Functions End Coroutines Components Scope & Dispatchers @rivuchakraborty #DevFestAhm

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Coroutines 20 @rivuchakraborty #DevFestAhm Suspending vs Blocking

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Coroutines 21 @rivuchakraborty #DevFestAhm Suspending vs Blocking

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Coroutines 22 @rivuchakraborty #DevFestAhm Suspending vs Blocking

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Launch a Coroutine 23 @rivuchakraborty #DevFestAhm

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Get the Job done or cancel it, your choice. :) 24 @rivuchakraborty #DevFestAhm

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Compute Async(hrounously) 25 @rivuchakraborty #DevFestAhm

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Deferred 26 @rivuchakraborty #DevFestAhm ● Deferred Extends Job ● Wrapper around your data

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Suspending Function 27 @rivuchakraborty #DevFestAhm ● suspend is a Keyword in Kotlin

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Suspending Function 28 @rivuchakraborty #DevFestAhm ● suspend is a Keyword in Kotlin ● Compiler level restriction - can’t call suspend function outside CoroutineScope

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Suspending Function 29 @rivuchakraborty #DevFestAhm ● suspend is a Keyword in Kotlin ● Compiler level restriction - can’t call suspend function outside CoroutineScope ● Suspends execution of current coroutine

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Coroutine Scope 30 @rivuchakraborty #DevFestAhm ● Container of CoroutineContext

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Coroutine Scope 31 @rivuchakraborty #DevFestAhm ● Container of CoroutineContext ● Every Coroutine Builder is an extension over CoroutineScope, and thus inherits its CoroutineContext

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Coroutine Scope 32 @rivuchakraborty #DevFestAhm ● 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 33 @rivuchakraborty #DevFestAhm

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Dispatchers 34 @rivuchakraborty #DevFestAhm ● 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 36 @rivuchakraborty #DevFestAhm

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API (Retrofit) 37 @rivuchakraborty #DevFestAhm

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Activity 38 @rivuchakraborty #DevFestAhm

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Call it 39 @rivuchakraborty #DevFestAhm

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Handle Exception (Gracefully) :) 40 @rivuchakraborty #DevFestAhm

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Rivu Chakraborty, BYJU’S @rivuchakraborty Resources https://caster.io/courses/kotlin-c oroutines-fundamentals ● http://bit.ly/CodeLabCoroutines ● http://bit.ly/CoroutinesAndroid ● http://bit.ly/DroidCoroutines ● http://bit.ly/CoroutinesGuide

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Rivu Chakraborty, BYJU’S @rivuchakraborty Thank you!