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Web Worker PoC in Scala.js
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>WW PoC</title> | |
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> | |
</head> | |
<body> | |
<div id="root"> | |
</div> | |
<script type="text/javascript" src="./target/scala-2.11/poc-fastopt.js"></script> | |
</body> | |
</html> |
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package poc | |
import org.scalajs.dom | |
import org.scalajs.dom.raw.{Event, Worker} | |
import scalatags.JsDom.all._ | |
import scala.scalajs.js | |
object Main extends JSApp { | |
def main(): Unit = { | |
val worker = new Worker("worker.js") | |
var x = 0 | |
val root = dom.document.getElementById("root") | |
val click: js.Function1[Event, _] = (e: Event) => { | |
x += 1 | |
if (x > 3) worker.postMessage("Testing") | |
} | |
root.appendChild( | |
div( | |
h1("Hello!"), | |
button(id := "post", onclick := click, "Send message") | |
).render | |
) | |
worker.addEventListener("message", { e: Event => | |
root.appendChild(div(e.data.toString).render) | |
} | |
worker.postMessage("Testing") | |
def nextAnimationFrame(time: Double): Unit = { | |
dom.window.requestAnimationFrame(nextAnimationFrame _) | |
// worker.postMessage(s"Time $time") | |
} | |
dom.window.requestAnimationFrame(nextAnimationFrame _) | |
} | |
} |
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importScripts("./target/scala-2.11/poc-fastopt.js"); | |
WorkerMain().main(); |
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package poc | |
import org.scalajs.dom | |
import scala.scalajs.js | |
import scala.scalajs.js.annotation.JSExport | |
@js.native | |
object WorkerGlobal extends js.GlobalScope { | |
def addEventListener(`type`: String, f: js.Function): Unit = js.native | |
def postMessage(data: js.Any): Unit = js.native | |
} | |
@JSExport("WorkerMain") | |
object WorkerMain { | |
@JSExport | |
def main(): Unit = { | |
WorkerGlobal.addEventListener("message", onMessage _ ) | |
WorkerGlobal.postMessage(s"Started") | |
} | |
val timeMessage = """Time.*""".r | |
var count = 0 | |
def onMessage(msg: dom.MessageEvent) = { | |
val s = msg.data.asInstanceOf[String] | |
s match { | |
case timeMessage() => | |
count += 1 | |
if(count % 600 == 0) | |
WorkerGlobal.postMessage("60fps") | |
case _ => | |
WorkerGlobal.postMessage(s"Received: $s") | |
} | |
} | |
} |
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