isolate_example

isolate_example.dart

Isolate isolate;

void startRealAsyncTask() async {
  // need a ReceivePort to receive messages.
  ReceivePort receivePort= ReceivePort(); 
  isolate = await Isolate.spawn(heavyTask, receivePort.sendPort);
  receivePort.listen((data) {
    stdout.write('RECEIVE: ' + data + ', ');
  });
}

void heavyTask(SendPort sendPort) {
  // doing something very heavy here.
  String msg = "I'm done";  
  sendPort.send(msg);
}

void stop() {  
  if (isolate != null) {
      stdout.writeln('killing isolate');
      isolate.kill(priority: Isolate.immediate);
      isolate = null;        
  }  
}

void main() async {
  stdout.writeln('spawning isolate...');
  await startRealAsyncTask();
  stdout.writeln('press enter key to quit...');
  await stdin.first;
  stop();
  stdout.writeln('goodbye!');
  exit(0);
}