LibTest/isolate/Isolate/spawn_A01_t04.dart

/*
 * Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 * for details. All rights reserved. Use of this source code is governed by a
 * BSD-style license that can be found in the LICENSE file.
 */
/**
 * @assertion Future<Isolate> spawn(void entryPoint(message), message)
 * Creates and spawns an isolate that shares the same code as the current isolate.
 * The entry-point function is invoked with the initial message.
 * @description Checks that chained spawning of 10 isolates works properly.
 * @author kaigorodov
 */

import "dart:isolate";
import "../../../Utils/expect.dart";
import "../../../Utils/async_utils.dart";

var expectedMessage="message";

class Connection {
  var receivePort = new ReceivePort();
  SendPort replyPort;
  
  Connection([this.replyPort]);
  
  void receiveHandler(var message) {
    Expect.equals(expectedMessage, message);
    receivePort.close();
    if (replyPort!=null) {
      replyPort.send(message);
    }
    asyncEnd();
  }

  start(int depth) {
    asyncStart();
    Isolate.spawn(iMain, {"replyPort":receivePort.sendPort, "depth":depth});
    receivePort.listen(receiveHandler);
  }
}

void iMain(Map data) {
  var depth=data["depth"];
  SendPort replyPort=data["replyPort"];
  if (depth==0) {
    replyPort.send(expectedMessage);
  } else {
    ReceivePort port = new ReceivePort();
    new Connection(replyPort).start(depth-1);
  }
}

main() {
  new Connection().start(10);
}