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Off the main thread with workers !
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Mariko Kosaka
April 27, 2018
Technology
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Off the main thread with workers !
This is a presentation slide I presented at Node学園 in Tokyo on April 27th, 2018
Mariko Kosaka
April 27, 2018
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Transcript
Off the main thread with workers! NodeֶԂ30࣌ݶ @kosamari
@kosamari
ECMAScriptͷۙگใࠂ
ES2018 ݻ·Γ·ͨ͠ ʢਖ਼ࣜʹ5݄ʹυϥϑτ֬ఆͯ͠6݄ʹঝೝ༧ఆʣ
Regex ڧԽ
Ұ൪خ͍͠ͷ Named Capture Groups
const pattern =/(\d{4})-(\d{2})-(\d{2})/u; const result = pattern.exec(‘2018-03-06'); // ! result[0]
=== '2018-03-06' // ! result[1] === '2018' // ! result[2] === '03' // ! result[3] === '06'
const pattern =/(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/u; const result = pattern.exec('2018-03-06'); // ! result.groups.year
=== '2018' // ! result.groups.month === '03' // ! result.groups.day === '06'
ʢେ͞Μͱωλ͕ඃͬͨͷͰ͏Ұͭʣ Lookbehind assertions
const pattern =/(?<=\$)\d+/u; const result = pattern.exec('$42'); // ! result[0]
=== '42'
Object Rest ͱ Sprad ඪ४ʹͳΔΑ
// Rest properties for object destructuring assignment: const person =
{ firstName:’Sebastian', lastName:’Markbåge', country:'USA', state:’CA'}; const{ firstName, lastName, ...rest } = person; console.log(firstName); // Sebastian console.log(lastName); // Markbåge console.log(rest); // { country: 'USA', state: 'CA' }
// Spread properties for object literals: const personCopy ={ firstName,
lastName, ...rest }; console.log(personCopy); // { firstName: 'Sebastian', // lastName: 'Markbåge', // country: 'USA', // state: 'CA' }
Finally, Promise.prototype.finally
fetch(url) .then((response)=> response.text()) .then((text)=>{ element.textContent = text; }) .catch((error)=>{ element.textContent
= error.message; })
fetch(url) .then((response)=> response.text()) .then((text)=>{ element.textContent = text; }) .catch((error)=>{ element.textContent
= error.message; }) .finally(()=>{ hideLoadingSpinner(); });
ChromeͰ ES2018͢Ͱʹશ෦͑·͢ʂ
https://slidr.io/mathiasbynens/what-s-new-in-es2018
Smoosh ࣄ݅
None
Ұिؒ͘Β͍ࣄʹͳΒΜ͔ͬͨ
Break the Web or NOT break the Web
ʮͳΜͱͳ͘ഉଞతʯ όογϯά
https://github.com/tc39/tc39-web-draft
Off the main thread with workers! NodeֶԂ30࣌ݶ @kosamari
݁શ͘ग़͍ͯ·ͤΜ ͜Μͳಈ͖͕͋ΔΑ͍ͬͯ͏ΞοϓσʔτͰ͢
ϑϩϯτΤϯυͰΨϦΨϦίʔυಈ͔͢ͱɺϖʔδॏ͘ͳΔΑͶʁ TL;DR
ϑϩϯτΤϯυͰΨϦΨϦίʔυಈ͔͢ͱɺϖʔδॏ͘ͳΔΑͶʁ ͦ͜Worker͍ͬͯ͏ศརͳͷ͕…ʢΑͬ͠ΌʔΔ͔ʔʣ TL;DR
ϑϩϯτΤϯυͰΨϦΨϦίʔυಈ͔͢ͱɺϖʔδॏ͘ͳΔΑͶʁ ͦ͜Worker͍ͬͯ͏ศརͳͷ͕…ʢΑͬ͠ΌʔΔ͔ʔʣ ͋ΕɺWorkerͷ͍͘͢͝ʹ͘͘ͳ͍ʁ TL;DR
ϑϩϯτΤϯυͰΨϦΨϦίʔυಈ͔͢ͱɺϖʔδॏ͘ͳΔΑͶʁ ͦ͜Worker͍ͬͯ͏ศརͳͷ͕…ʢΑͬ͠ΌʔΔ͔ʔʣ ͋ΕɺWorkerͷ͍͘͢͝ʹ͘͘ͳ͍ʁ ͍͘͢͢ΔʹͲ͏͢Εྑ͍ΜͩΖ͏…ʢ͝ҙݟืूதʣ TL;DR
ͦͦWorkerͱ
Data DOMͰग़དྷͯΔ ϒϥβ ϒϥβ͔Βଧ্ͪ͛ΒΕͨ WebWorker
const worker = new Worker('worker.js');
const worker = new Worker('worker.js'); worker.postMessage(data); self.onmessage = (message) =>
{ // do something
const worker = new Worker('worker.js'); worker.postMessage(data); self.onmessage = (message) =>
{ // do something self.postMessage(data) }
const worker = new Worker('worker.js'); worker.postMessage(data); worker.onmessage = (message) =>
{ // do something on main thread }; self.onmessage = (message) => { // do something high cost self.postMessage(data) }
ͳͥϚϧνεϨου͕ඞཁʁ ͦͦϒϥβͰඇಉظॲཧ͡Όͳ͍ͷʁ Promise͢ΔΜ͡Όͳ͍ͷʁ
࠷ۙͷΣϒΞϓϦΈΜͳ JSONσʔλΛΰχϣΰχϣ͔ͯ͠ΒDOMʹө
✔ Network
✔ Network ✔ DOM
✔ Network ✔ DOM ✗ data processing
✔ Network ✔ DOM ✗ data processing ͜Ε͕ංେԽͯ͠Δͷ͕
Does anyone like programming with workers?
ݴΘΕͯΈͨΒ…͜Εͷ͍͍ͮ͢͝Β͍ͳɻ (શʹετοΫϗϧϜީ܈ʹͳͬͯͨ)
WebWorkerπϥΠɹͦͷ̍ɿ WebWorkerΛ͏·͘͏ʹ εϨουϓʔϧతʹ εέδϡʔϥʔΛࣗͰ࣮͠ͳ͍ͱ͍͚ͳ͍
A JavaScript Scheduler API by Justin (2લͷΞΠσΞ)
Parallel JSϓϩϙʔαϧࣦʢ.NETͷPLINQΈ͍ͨͳͷʣ
WebWorkerΛྑ͍ͨ͘͠ɹٞ̍ɿ C#ͱ͔RxKotlinΈ͍ͨʹ͏·࣮͘ʁ Erlangૣ͍Β͍͠…
WebWorkerπϥΠɹͦͷ̎ɿ postMessageͰσʔλΓऔΓ͢Δͷ͕େม
postMessage({…}) postMessage({…})
SharedArrayBuffer
https://webkit.org/blog/7846/concurrent-javascript-it-can-work/
Transferable Streams
importScripts('vp10decode.js', 'mp4encode.js'); const transcoder = new TransformStream({ transform(chunk, controller) {
const decoded = vp10decode(chunk); controller.enqueue(mp4encode(decoded)); } }); postMessage(transcoder, [transcoder]); const worker = new Worker('transcode.js'); worker.onmessage = event => { const transcoder = event.data; await fetch('bunny.vp10') .pipeThrough(transcoder) .pipeTo(videoSink); };
WebWorkerΛྑ͍ͨ͘͠ɹٞ̎ɿ postMessageͷAPIΛநԽ͍ͯ͘͢͠
https://github.com/GoogleChromeLabs/comlink
https://github.com/GoogleChromeLabs/clooney
WebWorkerΛྑ͍ͨ͘͠ɹٞ̏ɿ εϨʔυϓʔϧϞσϧͱϝϞϦγΣΞϞσϧ ૬ੑ͕ྑ͘ͳ͍
WebWorkerπϥΠɹͦͷ3ɿ ͦͦWebWorkerͬͯϑΝΠϧΛ ผ͚ͳ͖Ό͍͚ͳͯ͘ΊΜͲ͍͘͞
JavaScript Tagged Blocks
WebWorkerΛྑ͍ͨ͘͠ɹٞ̐ɿ εϨουϞσϧʁͦΕͱλεΫϞσϧʁ
εϨουΒͬͨθʂ ͣͬͱฦ͞ͳ͍ζϥʂ C++ ࣄऴΘͬͨͳΒ returnฦͯ͠Αʙ
ϚϧνεϨουͰͷΣϒΞϓϦ։ൃ ͲΜͳ;͏ʹϓϩάϥϜॻ͖͍ͨͰ͔͢ʁ
ݴޠ༷VMͷߏ͔Βม͑ΒΕΔͱͨ͠ Ͳ͏͍ͨ͠Ͱ͔͢ʁ
ͥͻ͝ҙݟ͍ͩ͘͞ɻ Thanks ! @kosamari