51 lines
1.8 KiB
Dart
51 lines
1.8 KiB
Dart
import "dart:isolate";
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import "dart:async";
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Uri toDartDataUri(String source) {
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return Uri.parse("data:application/dart;charset=utf-8,"
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"${Uri.encodeComponent(source)}");
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}
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createIsolateSource(String moduleSource, List<List<String>> moduleImports) {
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var moduleSourceParts = ['import "dart:isolate";'];
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moduleImports.forEach((sourceImport) {
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String modName = sourceImport[0];
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String modAlias = sourceImport[1];
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moduleSourceParts.add("import 'package:${modName}.dart' as ${modAlias};");
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});
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moduleSourceParts.add(moduleSource);
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moduleSourceParts.add("""
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main(List args, SendPort replyPort) {
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replyPort.send(run(args));
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}
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""");
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return moduleSourceParts.join('\n');
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}
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var timeStamp = new DateTime.now().millisecondsSinceEpoch;
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dynamic callModule(dynamic data) { return data.map( (a) => a+1); }
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evalModule(String moduleSource, List<List<String>> imports, List args) {
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String source = createIsolateSource(moduleSource, imports);
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Completer completer = new Completer();
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RawReceivePort receivePort;
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receivePort = new RawReceivePort( (message) {
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receivePort.close();
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completer.complete(message);
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});
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// Note: we have a special karma plugin that sends files under
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// urls like /package_1234 as permanently cached.
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// With this, spawning multiple isolates gets faster as Darts does not
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// reload the files from the server.
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var packageRoot = Uri.parse('/packages_${timeStamp}');
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return Isolate.spawnUri(toDartDataUri(source), args, receivePort.sendPort, packageRoot: packageRoot).then( (isolate) {
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RawReceivePort errorPort;
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errorPort = new RawReceivePort( (message) {
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completer.completeError(message);
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});
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isolate.addErrorListener(errorPort.sendPort);
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return completer.future;
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});
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}
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