LibTest/isolate/Isolate/ping_A03_t02.dart

// Copyright (c) 2017, 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 void ping(
///      SendPort responsePort, {
///      Object response,
///      int priority: IMMEDIATE
/// })
///    Request that the isolate send response on the responsePort.
///    If the isolate is alive, it will eventually send response (defaulting
/// to null) on the response port.
///    The priority must be one of IMMEDIATE or BEFORE_NEXT_EVENT. The response
/// is sent at different times depending on the ping type:
///    * IMMEDIATE: The isolate responds as soon as it receives the control
/// message. This is after any previous control message from the same isolate
/// has been received, but may be during execution of another event.
///    * BEFORE_NEXT_EVENT: The response is scheduled for the next time control
/// returns to the event loop of the receiving isolate, after the current event,
/// and any already scheduled control events, are completed.
///    If response cannot be sent to the isolate, then the request is ignored.
/// It is recommended to only use simple values that can be sent to all isolates,
/// like null, booleans, numbers or strings.
///
/// @description Check that continuously running isolate never responds
/// to ping() call with BEFORE_NEXT_EVENT priority and various response values.
///
/// @author a.semenov@unipro.ru

import "dart:isolate";
import "dart:math";
import "dart:async";
import "../../../Utils/expect.dart";
import "IsolateUtil.dart";

entryPoint(SendPort message) {
  message.send("Started");
  Random random = new Random();
  int s = 0;
  while (true) {
    s = -s + random.nextInt(100);
  }
}

Future test(List<Object?> values) async {
  ReceivePort port = new ReceivePort();
  ReceivePort onExit = new ReceivePort();
  Isolate isolate = await Isolate.spawn(entryPoint, port.sendPort,
      onExit: onExit.sendPort,
      errorsAreFatal: true);
  var v = await port.first;
  List<Future> pingResponses = [];
  for (Object? value in values) {
    ReceivePort pingPort = new ReceivePort();
    isolate.ping(pingPort.sendPort,
        response: value, priority: Isolate.beforeNextEvent);
    Future pingResponse =
        pingPort.first.timeout(TWO_SECONDS, onTimeout: () {
      pingPort.close();
      return "timeout";
    });
    pingResponses.add(pingResponse);
  }
  for (var response in await Future.wait(pingResponses)) {
    Expect.equals("timeout", response);
  }
  isolate.kill(priority: Isolate.immediate);
  await onExit.first;
  asyncEnd();
}

main() {
  asyncStart();
  test([
    null,
    0,
    1,
    -1,
    true,
    false,
    "",
    "string",
    1.1,
    double.nan,
    double.infinity,
    0.0
  ]);
}