Created
May 25, 2016 19:59
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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> | |
| <script type="text/javascript"> | |
| Main().main(); | |
| </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.annotation.JSExport | |
| import scala.scalajs.js | |
| @JSExport("Main") | |
| object Main { | |
| @JSExport | |
| 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.onmessage = (e: js.Any) => { | |
| root.appendChild(div(e.asInstanceOf[dom.MessageEvent].data.asInstanceOf[String]).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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