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EAsync Kotlin
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Roberto Orgiu
November 17, 2017
Technology
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EAsync Kotlin
Slides about Kotlin Coroutines - Talk kept at DevFest Catania and DevFest Istanbul
Roberto Orgiu
November 17, 2017
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Transcript
Roberto Orgiu @_tiwiz Async Kotlin
Roberto Orgiu @_tiwiz EAsync Kotlin
Roberto Orgiu @_tiwiz What we expect
Roberto Orgiu @_tiwiz What we get
Roberto Orgiu @_tiwiz
Roberto Orgiu @_tiwiz launch { delay(1000L) println("World!") }T println("Hello,") Thread.sleep(2000L)
Roberto Orgiu @_tiwiz launch { delay(1000L) println("World!") }T println("Hello,") Thread.sleep(2000L)
Roberto Orgiu @_tiwiz launch { delay(1000L) println("World!") }T println("Hello,") Thread.sleep(2000L)
Roberto Orgiu @_tiwiz launch { delay(1000L) println("World!") }T println("Hello,") Thread.sleep(2000L)
Roberto Orgiu @_tiwiz launch { delay(1000L) println("World!") }T println("Hello,") Thread.sleep(2000L)
Roberto Orgiu @_tiwiz suspend fun delay( time: Long, unit: TimeUnit)
{ … }
Roberto Orgiu @_tiwiz launch { delay(1000L) println("World!") }T println("Hello,") Thread.sleep(2000L)
Roberto Orgiu @_tiwiz launch { delay(1000L) println("World!") }T println("Hello,") Thread.sleep(2000L)
Roberto Orgiu @_tiwiz !
Roberto Orgiu @_tiwiz //gradle.properties kotlin.coroutines=enable
Roberto Orgiu @_tiwiz //gradle.properties kotlin.coroutines=enable dependencies { compile “org.jetbrains.kotlinx:kotlinx- coroutines-android:0.19.3"
}
Roberto Orgiu @_tiwiz //gradle.properties kotlin.coroutines=enable dependencies { compile “org.jetbrains.kotlinx:kotlinx-coroutines-android:0.19.3" }
kotlin { experimental { coroutines "enable" } }
Roberto Orgiu @_tiwiz launch(UI){T for (i in 10 downTo 1)
{ hello.text = "Countdown $i ..." delay(500) }T hello.text="Done!" }T
Roberto Orgiu @_tiwiz launch( UI){T for (i in 10 downTo
1) { hello.text = "Countdown $i ..." delay(500) }T hello.text="Done!" }T
Roberto Orgiu @_tiwiz launch(UI){T for (i in 10 downTo 1)
{ hello.text = "Countdown $i ..." delay(500) }T hello.text="Done!" }T
Roberto Orgiu @_tiwiz launch(UI){T for (i in 10 downTo 1)
{ hello.text = "Countdown $i ..." delay(500) }T hello.text="Done!" }T val job = job.cancel()
Roberto Orgiu @_tiwiz suspend fun TextView.countdown()_{_ for_(i_in 10 downTo 1)_{_
text = "Countdown $i ..." delay(1000) }_ text="Done!" }_
Roberto Orgiu @_tiwiz suspend fun TextView.countdown()_{_}_ fun View.onClick(action: suspend ()_
->_Unit)_{_ setOnClickListener { launch(UI) { action() } } }_
Roberto Orgiu @_tiwiz suspend fun TextView.countdown()_{_}_ fun View.onClick(action: suspend ()_
->_Unit)_{_}_ fab.onClick { hello.countdown() }
Roberto Orgiu @_tiwiz
Roberto Orgiu @_tiwiz
Roberto Orgiu @_tiwiz Coroutines + Retrofit
Roberto Orgiu @_tiwiz fun View.onClick(action: suspend () -> Deferred<Response>) {
setOnClickListener { launch(UI) { toggleWaitingView() val response = action().await() bindUiTo(response) toggleContentView() }T }T }T
Roberto Orgiu @_tiwiz fun View.onClick(action: suspend () -> Deferred<Response>) {
setOnClickListener { launch(UI) { toggleWaitingView() val response = action().await() bindUiTo(response) toggleContentView() }T }T }T
Roberto Orgiu @_tiwiz fun View.onClick(action: suspend () -> Deferred<Response>) {
setOnClickListener { launch(UI) { toggleWaitingView() val response = action().await() bindUiTo(response) toggleContentView() }T }T }T
Roberto Orgiu @_tiwiz suspend fun getWeatherAsync() =T async {T getWeatherSync()
}T
Roberto Orgiu @_tiwiz suspend fun getWeatherAsync() =T async {T getWeatherSync()
}T
Roberto Orgiu @_tiwiz Incoming official support
Roberto Orgiu @_tiwiz What about testing?
Roberto Orgiu @_tiwiz @Test fun coroutine_test() {T val actualWeather =
runBlocking {T getWeatherAsync().await() }T …T }T
Roberto Orgiu @_tiwiz @Test fun coroutine_test() {T val actualWeather =
runBlocking {T getWeatherAsync().await() }T …T }T
Roberto Orgiu @_tiwiz One more thing… TRICK
Roberto Orgiu @_tiwiz Coroutines can be lazy
Roberto Orgiu @_tiwiz val result =T async(start = CoroutineStart.LAZY) {…}T
Roberto Orgiu @_tiwiz val result =T async(start = CoroutineStart.LAZY) {…}T
result.await()
Roberto Orgiu @_tiwiz Should we use coroutines?
Roberto Orgiu @_tiwiz YES
Roberto Orgiu @_tiwiz
Roberto Orgiu @_tiwiz open.nytimes.com @nytdev github.com/NYTimes developers.nytimes.com
Roberto Orgiu @_tiwiz Thank you @_tiwiz
Roberto Orgiu @_tiwiz EAsync Kotlin
Roberto Orgiu @_tiwiz EAsync Kotlin
Roberto Orgiu @_tiwiz EAsync Kotlin bit.ly/EAsyncKotlin