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October 6, 2014 21:56
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>web worker sample</title> | |
| </head> | |
| <body> | |
| <h1>web socket & web worker sample</h1> | |
| <h1>check console / editor output windows</h1> | |
| <script type="application/dart" src="main.dart"></script> | |
| <script src="packages/browser/dart.js"></script> | |
| </body> | |
| </html> |
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| //import 'dart:html'; | |
| import 'dart:isolate'; | |
| import 'dart:async'; | |
| void main() { | |
| SendPort sendPort; | |
| ReceivePort receive = new ReceivePort(); | |
| receive.listen((msg) { | |
| if (sendPort == null) { | |
| sendPort = msg; | |
| } else { | |
| print('From isolate: $msg'); | |
| } | |
| }); | |
| int counter = 0; | |
| // create the worker, passes the ws url, then send a count every sec | |
| Isolate.spawnUri(Uri.parse('ws_worker.dart'), ['ws://echo.websocket.org'], receive.sendPort).then((isolate) { | |
| new Timer.periodic(const Duration(seconds:1), (t) { | |
| sendPort.send('Count is ${counter++}'); | |
| }); | |
| }); | |
| } |
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| import 'dart:html'; | |
| import 'dart:isolate'; | |
| import 'dart:async'; | |
| WebSocket ws = null; | |
| void initWebSocket(SendPort sp, String url, [int retrySeconds = 2]) { | |
| var reconnectScheduled = false; | |
| void scheduleReconnect() { | |
| if (!reconnectScheduled) { | |
| new Timer(new Duration(milliseconds: 1000 * retrySeconds), () => initWebSocket(sp, url, retrySeconds * 2)); | |
| } | |
| reconnectScheduled = true; | |
| } | |
| sp.send("Connecting to websocket $url ..."); | |
| ws = new WebSocket(url); | |
| sp.send("websocket created"); | |
| ws.onOpen.listen((e) { | |
| sp.send('Connected'); | |
| }); | |
| ws.onClose.listen((e) { | |
| sp.send('Websocket closed, retrying in $retrySeconds seconds'); | |
| scheduleReconnect(); | |
| }); | |
| ws.onError.listen((e) { | |
| sp.send("Error connecting to ws"); | |
| scheduleReconnect(); | |
| }); | |
| ws.onMessage.listen((MessageEvent e) { | |
| sp.send('Received message: ${e.data}'); | |
| }); | |
| } | |
| // entry point of worker, expect a parameter: url of the websocker server | |
| main(List<String> args, SendPort sendPort) { | |
| ReceivePort receivePort = new ReceivePort(); | |
| sendPort.send(receivePort.sendPort); | |
| receivePort.listen((msg) { | |
| if (ws == null) | |
| initWebSocket(sendPort,args[0]); | |
| else | |
| ws.send('Hello from Dart!'); | |
| }); | |
| } |
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Dart:
WebSocket within a WebWorker test.
adapted from : https://github.com/dart-lang/dart-samples/tree/master/html5/web/websockets/basics