В первой части нашей статьи мы привели несколько примеров и подвели промежуточные итоги. Пришло время поработать с поиском и сделать окончательные выводы.
Представим, что теперь нам необходимо найти в загруженных данных определенные элементы по вводимому в инпут-значению. Данный тест реализован следующим способом: имеется инпут, в который вводятся посимвольно 3 подстроки в 3 символа из числа подстрок, имеющихся в элементах списка. Количество элементов в массиве при поиске увеличено в 10 раз и составляет 22730 штук.
Поиск осуществлялся в 2-х режимах -- примитивное наличие введенной строки в элементе из списка, а также с использованием алгоритма схожести строк.
Также, асинхронные варианты поиска -- compute/isolate не начинаются, пока не завершится предыдущий поиск. Т.е. схема такая -- введя первый символ в инпут, начинаем поиск, пока он не завершится -- данные не вернутся в основной поток и не перерисуется UI, второй символ в инпут не вводится. Когда все действия завершены, вводится второй символ и также наоборот. Это аналогично алгоритму, когда мы "копим" введенные пользователем символы, а затем отправляем всего один запрос, вместо отправки запроса на абсолютно каждый введенный символ, вне зависимости от того, с какой скоростью они вводились.
Замеры времени отрисовки производились только во время ввода символов в поиск, т.е. операции подготовки данных и что-то другое, не влияли на собранные данные.
Для начала, вспомогательные функции, функция поиска и другой общий код:
/// Функция для создания копии элементов
/// используемых как исходные при фильтрации
void cacheItems() {
_notFilteredItems.clear();
final List<Item> multipliedItems = [];
for (int i = 0; i < 10; i++) {
multipliedItems.addAll(items);
}
_notFilteredItems.addAll(multipliedItems);
}
/// Функция, запускающая тестовый сценарий
/// по вводу символов в текстовый инпут
Future<void> _testSearch() async {
List<String> words = items.map((Item item) => item.profile.replaceAll('https://opencollective.com/', '')).toSet().toList();
words = words
.map((String word) {
final String newWord = word.substring(0, min(word.length, 3));
return newWord;
})
.toSet()
.take(3)
.toList();
/// Стартуем счетчик кадров
_startFpsMeter();
for (String word in words) {
final List<String> letters = word.split('');
String search = '';
for (String letter in letters) {
search += letter;
await _setWord(search);
}
while (search.isNotEmpty) {
search = search.substring(0, search.length - 1);
await _setWord(search);
}
}
/// Останавливаем счетчик
_stopFpsMeter();
}
/// Вводим символы с задержкой
/// в 800мс, но если данные из асинхронного
/// фильтра (computed / isolate) еще не пришли,
/// то ждем их
Future<void> _setWord(String word) async {
if (!canPlaceNextLetter) {
await wait(800);
await _setWord(word);
} else {
searchController.value = TextEditingValue(text: word);
await wait(800);
}
}
/// В зависимости от установленного флага [USE_SIMILARITY]
/// используется или нет поиск со схожестью строк
List<Item> filterItems(Packet2<List<Item>, String> itemsAndInputValue) {
return itemsAndInputValue.value.where((Item item) {
return item.profile.contains(itemsAndInputValue.value2) || (USE_SIMILARITY && isStringsSimilar(item.profile, itemsAndInputValue.value2));
}).toList();
}
bool isStringsSimilar(String first, String second) {
return max(StringSimilarity.compareTwoStrings(first, second), StringSimilarity.compareTwoStrings(second, first)) >= 0.3);
}
Поиск в главном потоке
Future<void> runSearchOnMainThread() async {
cacheItems();
isLoading = true;
notifyListeners();
searchController.addListener(_searchOnMainThread);
await _testSearch();
searchController.removeListener(_searchOnMainThread);
isLoading = false;
notifyListeners();
}
void _searchOnMainThread() {
final String searchValue = searchController.text;
if (searchValue.isEmpty && items.length != _notFilteredItems.length) {
items.clear();
items.addAll(_notFilteredItems);
notifyListeners();
return;
}
items.clear();
/// Packet2 - обертка для двух значений
items.addAll(filterItems(Packet2(_notFilteredItems, searchValue)));
notifyListeners();
}
Простой поиск:
- Среднее время кадра -- 21.588ms / 46.32FPS
- Медианное время кадра -- 11.154ms / 89.65FPS
- Максимальное время кадра -- 668,986ms / 1.50FPS
Поиск со схожестью:
- Среднее время кадра -- 43,123ms / 23.19FPS
- Медианное время кадра -- 11,152ms / 89.67FPS
- Максимальное время кадра -- 2 440,910ms / 0.41FPS
Поиск через Compute
Future<void> runSearchWithCompute() async {
cacheItems();
isLoading = true;
notifyListeners();
searchController.addListener(_searchWithCompute);
await _testSearch();
searchController.removeListener(_searchWithCompute);
isLoading = false;
notifyListeners();
}
Future<void> _searchWithCompute() async {
canPlaceNextLetter = false;
/// Перед началом фильтрации
/// устанавливаем флаг, который будет сигнализировать
/// о том, что происходит асинхронная фильтрация
isSearching = true;
notifyListeners();
final String searchValue = searchController.text;
if (searchValue.isEmpty && items.length != _notFilteredItems.length) {
items.clear();
items.addAll(_notFilteredItems);
isSearching = false;
notifyListeners();
await wait(800);
canPlaceNextLetter = true;
return;
}
final List<Item> filteredItems = await compute(filterItems, Packet2(_notFilteredItems, searchValue));
/// После окончания фильтрации убираем сигнал
isSearching = false;
notifyListeners();
await wait(800);
items.clear();
items.addAll(filteredItems);
notifyListeners();
canPlaceNextLetter = true;
}
Простой поиск:
- Среднее время кадра -- 12,682ms / 78.85FPS
- Медианное время кадра -- 11,154ms / 89.65FPS
- Максимальное время кадра -- 111,544ms / 8.97FPS
Поиск со схожестью:
- Среднее время кадра -- 12,515ms / 79.90FPS
- Медианное время кадра -- 11,153ms / 89.66FPS
- Максимальное время кадра -- 111,527ms / 8.97FPS
Поиск с помощью Isolate
Немного кода:
/// Запускаем операцию в изоляте
Future<void> runSearchInIsolate() async {
send(Events.cacheItems);
}
void _middleLoadingEvent() {
final double time = bench.endTimer('Load items in separate isolate');
requestDurations.add(time);
bench.startTimer('Load items in separate isolate');
}
/// Этот метод запускается на событие [Events.cacheItems],
/// отправленное из изолята
Future<void> _startSearchOnIsolate() async {
isLoading = true;
notifyListeners();
searchController.addListener(_searchInIsolate);
await _testSearch();
searchController.removeListener(_searchInIsolate);
isLoading = false;
notifyListeners();
}
/// На каждое изменение инпута отсылается сообщение в изолят
void _searchInIsolate() {
canPlaceNextLetter = false;
isSearching = true;
notifyListeners();
send(Events.startSearch, searchController.text);
}
/// Запись в реактивный стейт данных из изолята
Future<void> _setFilteredItems(List<Item> filteredItems) async {
isSearching = false;
notifyListeners();
await wait(800);
items.clear();
items.addAll(filteredItems);
notifyListeners();
canPlaceNextLetter = true;
}
Future<void> _endLoadingEvents(List<Item> items) async {
this.items.clear();
this.items.addAll(items);
final double time = bench.endTimer('Load items in separate isolate');
requestDurations.add(time);
await wait(800);
isLoading = false;
notifyListeners();
_stopFpsMeter();
print('Load items in isolate ->' + requestDurations.join(' ').replaceAll('.', ','));
requestDurations.clear();
}
А это методы, находящиеся в бэкенде, который работает в стороннем изоляте:
/// Обработчик события [Events.cacheItems]
void _cacheItems() {
_notFilteredItems.clear();
final List<Item> multipliedItems = [];
for (int i = 0; i < 10; i++) {
multipliedItems.addAll(_items);
}
_notFilteredItems.addAll(multipliedItems);
send(Events.cacheItems);
}
/// На каждое событие [Events.startSearch] вызывается данный метод
/// фильтрующий элементы и отсылающий отфильтрованное в легкий стейт
void _filterItems(String searchValue) {
if (searchValue.isEmpty) {
_items.clear();
_items.addAll(_notFilteredItems);
send(ThirdEvents.setFilteredItems, _items);
return;
}
final List<Item> filteredItems = filterItems(Packet2(_notFilteredItems, searchValue));
_items.clear();
_items.addAll(filteredItems);
send(Events.setFilteredItems, _items);
}
Простой поиск:
- Среднее время кадра -- 11,354ms / 88.08FPS
- Медианное время кадра -- 11,153ms / 89.66FPS
- Максимальное время кадра -- 33,455ms / 29.89FPS
Поиск со схожестью:
- Среднее время кадра -- 11,353ms / 88.08FPS
- Медианное время кадра -- 11,153ms / 89.66FPS
- Максимальное время кадра -- 33,459ms / 29.89FPS
Еще одни выводы
Из этой таблички и предыдущего исследования следует, что:
- Главный поток не следует использовать для операций > 16ms (чтобы обеспечить, хотя бы, 60FPS)
- Compute технически подходит для частых и тяжелых операций, но накладывает overhead в те же 150ms, а также имеет более нестабильную производительность, по сравнению с постоянным изолятом (вероятно, это связано с тем, что каждый раз открывается, и, после завершения операции -- закрывается изолят, что также требует ресурсов)
- Isolate -- самый сложный в написании кода способ достижения максимальной производительности приложения на Flutter
Что же, кажется, что изоляты -- это идеальный способ достижения результата, и даже Google советует использовать именно их для всех тяжелых операций (это для красного словца, пруфов я не нашел?). Но нужно писать много кода. На самом деле, все что написано выше -- это результат, достигнутый с использованием представленной в самом начале библиотеки, без нее -- придется написать намного, намнооого больше. К тому же, данный алгоритм поиска можно оптимизировать -- после фильтрации всех элементов отправлять фронту только маленькую порцию данных -- это отнимет меньше ресурсов, а уже после ее передачи отправлять все остальное.
Также я проводил эксперименты по пропускной способности канала связи между изолятами. Для ее оценки использовалась таких сущностей:
class Item {
const Item(
this.id,
this.createdAt,
this.profile,
this.imageUrl,
);
final int id;
final DateTime createdAt;
final String profile;
final String imageUrl;
}
И получилось следующее -- при одновременной передаче 5000 элементов, время, которое уходит на копирование данных, не влияет на UI, т.е. частота отрисовки не уменьшается. Было передано 1 000 000 таких элементов пачками по 5 000 штук за раз с принудительной паузой между передачей пачек в 8ms, через Future<void>.delayed , при этом частота кадров не опускалась ниже 80FPS. К сожалению, делал я этот эксперимент задолго до написания данной статьи и сухих цифр нет (если будет запрос -- то появятся).
Многим может показаться сложным или не нужным разбираться с изолятами, и люди останавливаются на compute. Тут на помощь может прийти еще одна функциональность данного пакета, которая приравнивает API к простоте compute, а возможностей в итоге дает намного больше.
Вот пример:
/// Frontend part
Future<void> decrement([int diff = 1]) async {
counter = await runBackendMethod<int, int>(Events.decrement, diff);
}
/// -----
/// Backend part
Future<int> _decrement(int diff) async {
counter -= diff;
return counter;
}
Благодаря данному подходу можно просто вызвать функцию бэкенда по ID, которому эта функция соответствуют. Соответствие ID -- метод задается в предопределенных геттерах:
/// Frontend part
/// Данный блок отвечает за обработку событий из изолята
@override
Map<Events, Function> get tasks => {
Events.increment: _setCounter,
Events.decrement: _setCounter,
Events.error: _setCounter,
};
/// -----
/// Backend part
/// А данный -- за обработку событий из главного потока
@override
Map<Events, Function> get operations => {
Events.increment: _increment,
Events.decrement: _decrement,
};
Таким образом мы получаем два способа взаимодействия:
1 Асинхронное общение через явную передачу сообщений
1.1 Frontend-стейт (тот, что крутится в главном потоке, замиксованный с BackendMixin<EventType> ) отправляет событие в Backend-стейт используя метод send, передавая в сообщении ID события и необязательный аргумент.
enum Events {
increment,
}
class FirstState with BackendMixin<Events> {
int counter = 0;
void increment([int diff = 1]) {
send(Events.increment, diff);
}
void _setCounter(int value) {
counter = value;
notifyListeners();
}
@override
Map<Events, Function> get tasks => {
Events.increment: _setCounter,
};
}
1.2 Это сообщение передается в бэкенд и обрабатывается там
class FirstBackend extends Backend<Events> {
FirstBackend(SendPort toFrontend) : super(toFrontend);
int counter = 0;
void _increment(int diff) {
counter += diff;
send(Events.increment, counter);
}
@override
Map<Events, Function> get operations => {
Events.increment: _increment,
};
}
1.3 Backend-стейт возвращает результат в реактивный стейт главного потока и готово! Есть два способа вернуть результат -- возврат ответа методом бэкенда (return) (тогда ответ будет отправлен с тем же ID сообщения, что и был получен), а второй -- явно вызвать метод send. При этом можно отправлять в реактивный стейт какие угодно сообщения с любыми, заданными вами ID. Главное -- чтобы этим ID были заданы методы-обработчики.
Схематично, первый способ выглядит так:
Желтая двусторонняя стрелка -- взаимодействие с какими-либо сервисами извне, например -- неким сервером. А фиолетовая, идущая от сервера к бэку -- это входящие сообщения от того же сервера, например -- WebSocket.
2 Синхронное общение через вызов функции бэкенда по ее ID
2.1 Frontend использует метод runBackendMethod , указывая ID, чтобы вызвать метод бэка, ему соответствующий, получая ответ тут же. В таком способе не обязательно даже указывать что-либо в списке задач (tasks) вашего фронта. При этом, как показано в коде ниже, вы можете переопределить метод onBackendResponse в вашем фронте, который вызывается после каждого получения вашим фронт-стейтом сообщений от бэка.
enum Events {
decrement,
}
class FirstState with ChangeNotifier, BackendMixin<Events> {
int counter = 0;
Future<void> decrement([int diff = 1]) async {
counter = await runBackendMethod<int, int>(Events.decrement, diff);
}
/// Automatically notification after any event from backend
@override
void onBackendResponse() {
notifyListeners();
}
}
2.2 Backend-метод обрабатывает пришедшее событие, и просто возвращает результат. В данном случае есть одно ограничение -- методы бэка, вызываемые "синхронно", не должны вызывать метод send, с тем же ID, которому они соответствуют. В данном примере метод _decrement не должен вызывать метод send(Events.decrement). При этом любые другие сообщения он отправлять может.
class FirstBackend extends Backend<Events> {
FirstBackend(SendPort toFrontend) : super(toFrontend);
int counter = 0;
/// Or, you can simply return a value
Future<int> _decrement(int diff) async {
counter -= diff;
return counter;
}
@override
Map<Events, Function> get operations => {
Events.decrement: _decrement,
};
}
Схема второго способа похожа на первый, за тем исключением, что во фронте вам не нужно писать обработчики событий, прилетающих с бэка.
Что бы еще добавить...
Чтобы использовать такую связку -- необходимо эти бэкенды создавать. Для этого в BackendMixin<EventType> заложен механизм создания бэка -- метод initBackend. В данный метод необходимо передать функцию-фабрику по созданию бэкенда. Это должна быть чистая функция высшего уровня (top-level, как гласит документация Flutter), либо статический метод класса. Время создания одного изолята ~200ms.
enum Events {
increment,
decrement,
}
class FirstState with ChangeNotifier, BackendMixin<Events> {
int counter = 0;
void increment([int diff = 1]) {
send(Events.increment, diff);
}
Future<void> decrement([int diff = 1]) async {
counter = await runBackendMethod<int, int>(Events.decrement, diff);
}
void _setCounter(int value) {
counter = value;
}
Future<void> initState() async {
await initBackend(createFirstBackend);
}
/// Automatically notification after any event from backend
@override
void onBackendResponse() {
notifyListeners();
}
@override
Map<Events, Function> get tasks => {
Events.increment: _setCounter,
};
}
Пример функции-создателя Backend-части:
typedef Creator<TDataType> = void Function(BackendArgument<TDataType> argument);
void createFirstBackend(BackendArgument<void> argument) {
FirstBackend(argument.toFrontend);
}
@protected
Future<void> initBackend<TDataType extends Object>(Creator<TDataType> creator, {TDataType data, ErrorHandler errorHandler}) async {
/// ...
}
Ограничения
- Все тоже самое, что есть у обычного изолята
- Для каждого создающегося "бэкенда" в данный момент создается свой изолят и при слишком большом количестве бэкендов -- время их создания становится ощутимым, особенно, если инициализировать все их, скажем, при загрузке приложения. Я проводил эксперименты, запуская одновременно 30 бэкендов -- время загрузки на указанном выше телефоне в --release режиме заняло 6 с небольшим секунд.
- Есть некоторые сложности с обработкой ошибок, возникающих в изолятах (бэкендах). Тут, если вас заинтересует данный пакет, следует подробнее ознакомиться с методом initBackend из BackendMixin.
- Сложность написания кода выше, по сравнению с хранением логики только в главном потоке
Чек-лист для использования
Тут все просто, вам не нужно использовать изоляты (как отдельно, так и с помощью данного пакета), если:
- Производительность вашего приложения не падает при различных операциях
- Для узких мест вам достаточно compute
- Вам не хочется разбираться с изолятами
- Цикл жизни вашего приложения настолько короткий, что нет смысла его оптимизировать
В противном случае -- вы можете обратить свое внимание на данный подход и пакет, который упростит вашу работу с изолятами.
<!doctype html>
<html lang="ru" class="no-js no-touch ">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="yandex-verification" content="3019a35aeda6b45d" />
<meta name="robots" content="noindex"/>
<script type="text/javascript">
var html = document.getElementsByTagName('html')[0];
html.className = html.className.replace('no-js', '');
window.React = {};
window.metrics = [];
window.TEST_ENV = false;
window.isSuperuser = false;
window.isStaff = false;
window.isHeadTeacher = false;
</script>
<script type="text/javascript">
window.DEBUG_COUNTERS = true;
var yaParams = {
'course_title': 'b',
'ab': 'b',
'features': JSON.parse('{"category-catalog-redirect": true, "landing-price-mode-switcher": true, "register-instead-of-start-test": true, "main-page-redesign": true, "subscription_genus_basic": true, "adblender": true, "greenlight": true, "phone": true, "professions": true, "course_enrol": true, "new_lessons_page": true, "jivosite": false, "course-page-single-screen": true, "right-price": false, "course_page_header_footer_new": true, "submit-application": false, "prof_dev_certificate": false, "assessment-react": true, "new-events-calendar": true, "new-pre-assessment-screen": true, "recommended_courses": true, "tinkoff_payment": true, "payment-page-3-front-refactor": true, "installment-calculator": true, "boomstream-player": true, "finsystems": true, "new-reviews": true}')
};
</script>
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<script>
mindbox = window.mindbox || function() { mindbox.queue.push(arguments); };
mindbox.queue = mindbox.queue || [];
mindbox('create');
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<h1 class="blog__h1">Состояние Flutter на изолятах. Эксперимент № 2</h1>
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<p>В <a href="https://otus.ru/nest/post/2308/">первой части</a> нашей статьи мы привели несколько примеров и подвели промежуточные итоги. Пришло время поработать с поиском и сделать окончательные выводы. <cut></cut></p>
<p>Представим, что теперь нам необходимо найти в загруженных данных определенные элементы по вводимому в инпут-значению. Данный тест реализован следующим способом: имеется инпут, в который вводятся посимвольно 3 подстроки в 3 символа из числа подстрок, имеющихся в элементах списка. Количество элементов в массиве при поиске увеличено в 10 раз и составляет 22730 штук.</p>
<p>Поиск осуществлялся в 2-х режимах -- примитивное наличие введенной строки в элементе из списка, а также с использованием алгоритма схожести строк.</p>
<p>Также, асинхронные варианты поиска -- compute/isolate не начинаются, пока не завершится предыдущий поиск. Т.е. схема такая -- введя первый символ в инпут, начинаем поиск, пока он не завершится -- данные не вернутся в основной поток и не перерисуется UI, второй символ в инпут не вводится. Когда все действия завершены, вводится второй символ и также наоборот. Это аналогично алгоритму, когда мы "копим" введенные пользователем символы, а затем отправляем всего один запрос, вместо отправки запроса на абсолютно каждый введенный символ, вне зависимости от того, с какой скоростью они вводились.</p>
<p>Замеры времени отрисовки производились только во время ввода символов в поиск, т.е. операции подготовки данных и что-то другое, не влияли на собранные данные.</p>
<p>Для начала, вспомогательные функции, функция поиска и другой общий код:</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Функция для создания копии элементов</span>
<span class="c1">/// используемых как исходные при фильтрации</span>
<span class="kt">void</span> <span class="n">cacheItems</span><span class="p">()</span> <span class="p">{</span>
<span class="n">_notFilteredItems</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">multipliedItems</span> <span class="o">=</span> <span class="p">[];</span>
<span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="m">10</span><span class="p">;</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
<span class="n">multipliedItems</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">items</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">_notFilteredItems</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">multipliedItems</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</pre>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Функция, запускающая тестовый сценарий</span>
<span class="c1">/// по вводу символов в текстовый инпут</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">_testSearch</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">List</span><span class="o"><</span><span class="kt">String</span><span class="o">></span> <span class="n">words</span> <span class="o">=</span> <span class="n">items</span><span class="p">.</span><span class="n">map</span><span class="p">((</span><span class="n">Item</span> <span class="n">item</span><span class="p">)</span> <span class="o">=></span> <span class="n">item</span><span class="p">.</span><span class="n">profile</span><span class="p">.</span><span class="n">replaceAll</span><span class="p">(</span><span class="s1">'https://opencollective.com/'</span><span class="p">,</span> <span class="s1">''</span><span class="p">)).</span><span class="n">toSet</span><span class="p">().</span><span class="n">toList</span><span class="p">();</span>
<span class="n">words</span> <span class="o">=</span> <span class="n">words</span>
<span class="p">.</span><span class="n">map</span><span class="p">((</span><span class="kt">String</span> <span class="n">word</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">newWord</span> <span class="o">=</span> <span class="n">word</span><span class="p">.</span><span class="n">substring</span><span class="p">(</span><span class="m">0</span><span class="p">,</span> <span class="n">min</span><span class="p">(</span><span class="n">word</span><span class="p">.</span><span class="n">length</span><span class="p">,</span> <span class="m">3</span><span class="p">));</span>
<span class="k">return</span> <span class="n">newWord</span><span class="p">;</span>
<span class="p">})</span>
<span class="p">.</span><span class="n">toSet</span><span class="p">()</span>
<span class="p">.</span><span class="n">take</span><span class="p">(</span><span class="m">3</span><span class="p">)</span>
<span class="p">.</span><span class="n">toList</span><span class="p">();</span>
<span class="c1">/// Стартуем счетчик кадров</span>
<span class="n">_startFpsMeter</span><span class="p">();</span>
<span class="k">for</span> <span class="p">(</span><span class="kt">String</span> <span class="n">word</span> <span class="k">in</span> <span class="n">words</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="kt">String</span><span class="o">></span> <span class="n">letters</span> <span class="o">=</span> <span class="n">word</span><span class="p">.</span><span class="n">split</span><span class="p">(</span><span class="s1">''</span><span class="p">);</span>
<span class="kt">String</span> <span class="n">search</span> <span class="o">=</span> <span class="s1">''</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span><span class="kt">String</span> <span class="n">letter</span> <span class="k">in</span> <span class="n">letters</span><span class="p">)</span> <span class="p">{</span>
<span class="n">search</span> <span class="o">+=</span> <span class="n">letter</span><span class="p">;</span>
<span class="kd">await</span> <span class="n">_setWord</span><span class="p">(</span><span class="n">search</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">while</span> <span class="p">(</span><span class="n">search</span><span class="p">.</span><span class="n">isNotEmpty</span><span class="p">)</span> <span class="p">{</span>
<span class="n">search</span> <span class="o">=</span> <span class="n">search</span><span class="p">.</span><span class="n">substring</span><span class="p">(</span><span class="m">0</span><span class="p">,</span> <span class="n">search</span><span class="p">.</span><span class="n">length</span> <span class="o">-</span> <span class="m">1</span><span class="p">);</span>
<span class="kd">await</span> <span class="n">_setWord</span><span class="p">(</span><span class="n">search</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="c1">/// Останавливаем счетчик</span>
<span class="n">_stopFpsMeter</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</pre>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Вводим символы с задержкой</span>
<span class="c1">/// в 800мс, но если данные из асинхронного</span>
<span class="c1">/// фильтра (computed / isolate) еще не пришли,</span>
<span class="c1">/// то ждем их</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">_setWord</span><span class="p">(</span><span class="kt">String</span> <span class="n">word</span><span class="p">)</span> <span class="kd">async</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">canPlaceNextLetter</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">await</span> <span class="n">wait</span><span class="p">(</span><span class="m">800</span><span class="p">);</span>
<span class="kd">await</span> <span class="n">_setWord</span><span class="p">(</span><span class="n">word</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">searchController</span><span class="p">.</span><span class="n">value</span> <span class="o">=</span> <span class="n">TextEditingValue</span><span class="p">(</span><span class="nl">text:</span> <span class="n">word</span><span class="p">);</span>
<span class="kd">await</span> <span class="n">wait</span><span class="p">(</span><span class="m">800</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="c1">/// В зависимости от установленного флага [USE_SIMILARITY]</span>
<span class="c1">/// используется или нет поиск со схожестью строк</span>
<span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">filterItems</span><span class="p">(</span><span class="n">Packet2</span><span class="o"><</span><span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span><span class="p">,</span> <span class="kt">String</span><span class="o">></span> <span class="n">itemsAndInputValue</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">itemsAndInputValue</span><span class="p">.</span><span class="n">value</span><span class="p">.</span><span class="n">where</span><span class="p">((</span><span class="n">Item</span> <span class="n">item</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">item</span><span class="p">.</span><span class="n">profile</span><span class="p">.</span><span class="n">contains</span><span class="p">(</span><span class="n">itemsAndInputValue</span><span class="p">.</span><span class="n">value2</span><span class="p">)</span> <span class="o">||</span> <span class="p">(</span><span class="n">USE_SIMILARITY</span> <span class="o">&&</span> <span class="n">isStringsSimilar</span><span class="p">(</span><span class="n">item</span><span class="p">.</span><span class="n">profile</span><span class="p">,</span> <span class="n">itemsAndInputValue</span><span class="p">.</span><span class="n">value2</span><span class="p">));</span>
<span class="p">}).</span><span class="n">toList</span><span class="p">();</span>
<span class="p">}</span>
<span class="kt">bool</span> <span class="n">isStringsSimilar</span><span class="p">(</span><span class="kt">String</span> <span class="n">first</span><span class="p">,</span> <span class="kt">String</span> <span class="n">second</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">max</span><span class="p">(</span><span class="n">StringSimilarity</span><span class="p">.</span><span class="n">compareTwoStrings</span><span class="p">(</span><span class="n">first</span><span class="p">,</span> <span class="n">second</span><span class="p">),</span> <span class="n">StringSimilarity</span><span class="p">.</span><span class="n">compareTwoStrings</span><span class="p">(</span><span class="n">second</span><span class="p">,</span> <span class="n">first</span><span class="p">))</span> <span class="o">>=</span> <span class="m">0.3</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</pre>
<h2>Поиск в главном потоке</h2>
<pre><div class="codehilite"><pre><span></span><span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">runSearchOnMainThread</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">cacheItems</span><span class="p">();</span>
<span class="n">isLoading</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="n">searchController</span><span class="p">.</span><span class="n">addListener</span><span class="p">(</span><span class="n">_searchOnMainThread</span><span class="p">);</span>
<span class="kd">await</span> <span class="n">_testSearch</span><span class="p">();</span>
<span class="n">searchController</span><span class="p">.</span><span class="n">removeListener</span><span class="p">(</span><span class="n">_searchOnMainThread</span><span class="p">);</span>
<span class="n">isLoading</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
<span class="kt">void</span> <span class="n">_searchOnMainThread</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">searchValue</span> <span class="o">=</span> <span class="n">searchController</span><span class="p">.</span><span class="n">text</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">searchValue</span><span class="p">.</span><span class="n">isEmpty</span> <span class="o">&&</span> <span class="n">items</span><span class="p">.</span><span class="n">length</span> <span class="o">!=</span> <span class="n">_notFilteredItems</span><span class="p">.</span><span class="n">length</span><span class="p">)</span> <span class="p">{</span>
<span class="n">items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="n">items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">_notFilteredItems</span><span class="p">);</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="c1">/// Packet2 - обертка для двух значений</span>
<span class="n">items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">filterItems</span><span class="p">(</span><span class="n">Packet2</span><span class="p">(</span><span class="n">_notFilteredItems</span><span class="p">,</span> <span class="n">searchValue</span><span class="p">)));</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Простой поиск:</p>
<ul>
<li>Среднее время кадра -- 21.588ms / 46.32FPS</li>
<li>Медианное время кадра -- 11.154ms / 89.65FPS</li>
<li>Максимальное время кадра -- 668,986ms / 1.50FPS</li>
</ul>
<p>Поиск со схожестью:</p>
<ul>
<li>Среднее время кадра -- 43,123ms / 23.19FPS</li>
<li>Медианное время кадра -- 11,152ms / 89.67FPS</li>
<li>Максимальное время кадра -- 2 440,910ms / 0.41FPS</li>
</ul>
<h2>Поиск через Compute</h2>
<pre><div class="codehilite"><pre><span></span><span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">runSearchWithCompute</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">cacheItems</span><span class="p">();</span>
<span class="n">isLoading</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="n">searchController</span><span class="p">.</span><span class="n">addListener</span><span class="p">(</span><span class="n">_searchWithCompute</span><span class="p">);</span>
<span class="kd">await</span> <span class="n">_testSearch</span><span class="p">();</span>
<span class="n">searchController</span><span class="p">.</span><span class="n">removeListener</span><span class="p">(</span><span class="n">_searchWithCompute</span><span class="p">);</span>
<span class="n">isLoading</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">_searchWithCompute</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">canPlaceNextLetter</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="c1">/// Перед началом фильтрации</span>
<span class="c1">/// устанавливаем флаг, который будет сигнализировать</span>
<span class="c1">/// о том, что происходит асинхронная фильтрация</span>
<span class="n">isSearching</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">searchValue</span> <span class="o">=</span> <span class="n">searchController</span><span class="p">.</span><span class="n">text</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">searchValue</span><span class="p">.</span><span class="n">isEmpty</span> <span class="o">&&</span> <span class="n">items</span><span class="p">.</span><span class="n">length</span> <span class="o">!=</span> <span class="n">_notFilteredItems</span><span class="p">.</span><span class="n">length</span><span class="p">)</span> <span class="p">{</span>
<span class="n">items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="n">items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">_notFilteredItems</span><span class="p">);</span>
<span class="n">isSearching</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="kd">await</span> <span class="n">wait</span><span class="p">(</span><span class="m">800</span><span class="p">);</span>
<span class="n">canPlaceNextLetter</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">filteredItems</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">compute</span><span class="p">(</span><span class="n">filterItems</span><span class="p">,</span> <span class="n">Packet2</span><span class="p">(</span><span class="n">_notFilteredItems</span><span class="p">,</span> <span class="n">searchValue</span><span class="p">));</span>
<span class="c1">/// После окончания фильтрации убираем сигнал</span>
<span class="n">isSearching</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="kd">await</span> <span class="n">wait</span><span class="p">(</span><span class="m">800</span><span class="p">);</span>
<span class="n">items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="n">items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">filteredItems</span><span class="p">);</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="n">canPlaceNextLetter</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Простой поиск:</p>
<ul>
<li>Среднее время кадра -- 12,682ms / 78.85FPS</li>
<li>Медианное время кадра -- 11,154ms / 89.65FPS</li>
<li>Максимальное время кадра -- 111,544ms / 8.97FPS</li>
</ul>
<p>Поиск со схожестью:</p>
<ul>
<li>Среднее время кадра -- 12,515ms / 79.90FPS</li>
<li>Медианное время кадра -- 11,153ms / 89.66FPS</li>
<li>Максимальное время кадра -- 111,527ms / 8.97FPS</li>
</ul>
<h2>Поиск с помощью Isolate</h2>
<p>Немного кода:</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Запускаем операцию в изоляте</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">runSearchInIsolate</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">cacheItems</span><span class="p">);</span>
<span class="p">}</span>
<span class="kt">void</span> <span class="n">_middleLoadingEvent</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">final</span> <span class="kt">double</span> <span class="n">time</span> <span class="o">=</span> <span class="n">bench</span><span class="p">.</span><span class="n">endTimer</span><span class="p">(</span><span class="s1">'Load items in separate isolate'</span><span class="p">);</span>
<span class="n">requestDurations</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">time</span><span class="p">);</span>
<span class="n">bench</span><span class="p">.</span><span class="n">startTimer</span><span class="p">(</span><span class="s1">'Load items in separate isolate'</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// Этот метод запускается на событие [Events.cacheItems],</span>
<span class="c1">/// отправленное из изолята</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">_startSearchOnIsolate</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">isLoading</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="n">searchController</span><span class="p">.</span><span class="n">addListener</span><span class="p">(</span><span class="n">_searchInIsolate</span><span class="p">);</span>
<span class="kd">await</span> <span class="n">_testSearch</span><span class="p">();</span>
<span class="n">searchController</span><span class="p">.</span><span class="n">removeListener</span><span class="p">(</span><span class="n">_searchInIsolate</span><span class="p">);</span>
<span class="n">isLoading</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
<span class="c1">/// На каждое изменение инпута отсылается сообщение в изолят</span>
<span class="kt">void</span> <span class="n">_searchInIsolate</span><span class="p">()</span> <span class="p">{</span>
<span class="n">canPlaceNextLetter</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">isSearching</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">startSearch</span><span class="p">,</span> <span class="n">searchController</span><span class="p">.</span><span class="n">text</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// Запись в реактивный стейт данных из изолята</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">_setFilteredItems</span><span class="p">(</span><span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">filteredItems</span><span class="p">)</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">isSearching</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="kd">await</span> <span class="n">wait</span><span class="p">(</span><span class="m">800</span><span class="p">);</span>
<span class="n">items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="n">items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">filteredItems</span><span class="p">);</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="n">canPlaceNextLetter</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">_endLoadingEvents</span><span class="p">(</span><span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">items</span><span class="p">)</span> <span class="kd">async</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="n">items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="k">this</span><span class="p">.</span><span class="n">items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">items</span><span class="p">);</span>
<span class="kd">final</span> <span class="kt">double</span> <span class="n">time</span> <span class="o">=</span> <span class="n">bench</span><span class="p">.</span><span class="n">endTimer</span><span class="p">(</span><span class="s1">'Load items in separate isolate'</span><span class="p">);</span>
<span class="n">requestDurations</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">time</span><span class="p">);</span>
<span class="kd">await</span> <span class="n">wait</span><span class="p">(</span><span class="m">800</span><span class="p">);</span>
<span class="n">isLoading</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="n">_stopFpsMeter</span><span class="p">();</span>
<span class="n">print</span><span class="p">(</span><span class="s1">'Load items in isolate ->'</span> <span class="o">+</span> <span class="n">requestDurations</span><span class="p">.</span><span class="n">join</span><span class="p">(</span><span class="s1">' '</span><span class="p">).</span><span class="n">replaceAll</span><span class="p">(</span><span class="s1">'.'</span><span class="p">,</span> <span class="s1">','</span><span class="p">));</span>
<span class="n">requestDurations</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>А это методы, находящиеся в бэкенде, который работает в стороннем изоляте:</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Обработчик события [Events.cacheItems]</span>
<span class="kt">void</span> <span class="n">_cacheItems</span><span class="p">()</span> <span class="p">{</span>
<span class="n">_notFilteredItems</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">multipliedItems</span> <span class="o">=</span> <span class="p">[];</span>
<span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="m">10</span><span class="p">;</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
<span class="n">multipliedItems</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">_items</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">_notFilteredItems</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">multipliedItems</span><span class="p">);</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">cacheItems</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// На каждое событие [Events.startSearch] вызывается данный метод</span>
<span class="c1">/// фильтрующий элементы и отсылающий отфильтрованное в легкий стейт</span>
<span class="kt">void</span> <span class="n">_filterItems</span><span class="p">(</span><span class="kt">String</span> <span class="n">searchValue</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">searchValue</span><span class="p">.</span><span class="n">isEmpty</span><span class="p">)</span> <span class="p">{</span>
<span class="n">_items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="n">_items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">_notFilteredItems</span><span class="p">);</span>
<span class="n">send</span><span class="p">(</span><span class="n">ThirdEvents</span><span class="p">.</span><span class="n">setFilteredItems</span><span class="p">,</span> <span class="n">_items</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">filteredItems</span> <span class="o">=</span> <span class="n">filterItems</span><span class="p">(</span><span class="n">Packet2</span><span class="p">(</span><span class="n">_notFilteredItems</span><span class="p">,</span> <span class="n">searchValue</span><span class="p">));</span>
<span class="n">_items</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="n">_items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="n">filteredItems</span><span class="p">);</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">setFilteredItems</span><span class="p">,</span> <span class="n">_items</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Простой поиск:</p>
<ul>
<li>Среднее время кадра -- 11,354ms / 88.08FPS</li>
<li>Медианное время кадра -- 11,153ms / 89.66FPS</li>
<li>Максимальное время кадра -- 33,455ms / 29.89FPS</li>
</ul>
<p>Поиск со схожестью:</p>
<ul>
<li>Среднее время кадра -- 11,353ms / 88.08FPS</li>
<li>Медианное время кадра -- 11,153ms / 89.66FPS</li>
<li>Максимальное время кадра -- 33,459ms / 29.89FPS</li>
</ul>
<h2>Еще одни выводы</h2>
<p><img alt="2-1801-6f16a3.png" src="https://cdn.otus.ru/media/public/6f/16/2-1801-6f16a3.png"></p>
<p>Из этой таблички и предыдущего исследования следует, что:</p>
<ul>
<li>Главный поток не следует использовать для операций > 16ms (чтобы обеспечить, хотя бы, 60FPS)</li>
<li>Compute технически подходит для частых и тяжелых операций, но накладывает overhead в те же 150ms, а также имеет более нестабильную производительность, по сравнению с постоянным изолятом (вероятно, это связано с тем, что каждый раз открывается, и, после завершения операции -- закрывается изолят, что также требует ресурсов)</li>
<li>Isolate -- самый сложный в написании кода способ достижения максимальной производительности приложения на Flutter</li>
</ul>
<p>Что же, кажется, что изоляты -- это идеальный способ достижения результата, и даже Google советует использовать именно их для всех тяжелых операций (это для красного словца, пруфов я не нашел?). Но нужно писать много кода. На самом деле, все что написано выше -- это результат, достигнутый с использованием представленной в самом начале библиотеки, без нее -- придется написать намного, намнооого больше. К тому же, данный алгоритм поиска можно оптимизировать -- после фильтрации всех элементов отправлять фронту только маленькую порцию данных -- это отнимет меньше ресурсов, а уже после ее передачи отправлять все остальное.</p>
<p>Также я проводил эксперименты по пропускной способности канала связи между изолятами. Для ее оценки использовалась таких сущностей:</p>
<pre><div class="codehilite"><pre><span></span><span class="kd">class</span> <span class="nc">Item</span> <span class="p">{</span>
<span class="kd">const</span> <span class="n">Item</span><span class="p">(</span>
<span class="k">this</span><span class="p">.</span><span class="n">id</span><span class="p">,</span>
<span class="k">this</span><span class="p">.</span><span class="n">createdAt</span><span class="p">,</span>
<span class="k">this</span><span class="p">.</span><span class="n">profile</span><span class="p">,</span>
<span class="k">this</span><span class="p">.</span><span class="n">imageUrl</span><span class="p">,</span>
<span class="p">);</span>
<span class="kd">final</span> <span class="kt">int</span> <span class="n">id</span><span class="p">;</span>
<span class="kd">final</span> <span class="n">DateTime</span> <span class="n">createdAt</span><span class="p">;</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">profile</span><span class="p">;</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">imageUrl</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>И получилось следующее -- при одновременной передаче 5000 элементов, время, которое уходит на копирование данных, не влияет на UI, т.е. частота отрисовки не уменьшается. Было передано 1 000 000 таких элементов пачками по 5 000 штук за раз с принудительной паузой между передачей пачек в 8ms, через Future<void>.delayed , при этом частота кадров не опускалась ниже 80FPS. К сожалению, делал я этот эксперимент задолго до написания данной статьи и сухих цифр нет (если будет запрос -- то появятся).</p>
<p>Многим может показаться сложным или не нужным разбираться с изолятами, и люди останавливаются на compute. Тут на помощь может прийти еще одна функциональность данного пакета, которая приравнивает API к простоте compute, а возможностей в итоге дает намного больше.</p>
<p>Вот пример:</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Frontend part</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">decrement</span><span class="p">([</span><span class="kt">int</span> <span class="n">diff</span> <span class="o">=</span> <span class="m">1</span><span class="p">])</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">runBackendMethod</span><span class="o"><</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">decrement</span><span class="p">,</span> <span class="n">diff</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// -----</span>
<span class="c1">/// Backend part</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">int</span><span class="o">></span> <span class="n">_decrement</span><span class="p">(</span><span class="kt">int</span> <span class="n">diff</span><span class="p">)</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">-=</span> <span class="n">diff</span><span class="p">;</span>
<span class="k">return</span> <span class="n">counter</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Благодаря данному подходу можно просто вызвать функцию бэкенда по ID, которому эта функция соответствуют. Соответствие ID -- метод задается в предопределенных геттерах:</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Frontend part</span>
<span class="c1">/// Данный блок отвечает за обработку событий из изолята</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Map</span><span class="o"><</span><span class="n">Events</span><span class="p">,</span> <span class="n">Function</span><span class="o">></span> <span class="kd">get</span> <span class="n">tasks</span> <span class="o">=></span> <span class="p">{</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">increment:</span> <span class="n">_setCounter</span><span class="p">,</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">decrement:</span> <span class="n">_setCounter</span><span class="p">,</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">error:</span> <span class="n">_setCounter</span><span class="p">,</span>
<span class="p">};</span>
<span class="c1">/// -----</span>
<span class="c1">/// Backend part</span>
<span class="c1">/// А данный -- за обработку событий из главного потока</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Map</span><span class="o"><</span><span class="n">Events</span><span class="p">,</span> <span class="n">Function</span><span class="o">></span> <span class="kd">get</span> <span class="n">operations</span> <span class="o">=></span> <span class="p">{</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">increment:</span> <span class="n">_increment</span><span class="p">,</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">decrement:</span> <span class="n">_decrement</span><span class="p">,</span>
<span class="p">};</span>
</pre></div>
</pre>
<p>Таким образом мы получаем два способа взаимодействия:</p>
<p><strong>1 Асинхронное общение через явную передачу сообщений</strong></p>
<p>1.1 Frontend-стейт (тот, что крутится в главном потоке, замиксованный с BackendMixin<EventType> ) отправляет событие в Backend-стейт используя метод send, передавая в сообщении ID события и необязательный аргумент.</p>
<pre><div class="codehilite"><pre><span></span><span class="n">enum</span> <span class="n">Events</span> <span class="p">{</span>
<span class="n">increment</span><span class="p">,</span>
<span class="p">}</span>
<span class="kd">class</span> <span class="nc">FirstState</span> <span class="kd">with</span> <span class="n">BackendMixin</span><span class="o"><</span><span class="n">Events</span><span class="o">></span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">counter</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span>
<span class="kt">void</span> <span class="n">increment</span><span class="p">([</span><span class="kt">int</span> <span class="n">diff</span> <span class="o">=</span> <span class="m">1</span><span class="p">])</span> <span class="p">{</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">increment</span><span class="p">,</span> <span class="n">diff</span><span class="p">);</span>
<span class="p">}</span>
<span class="kt">void</span> <span class="n">_setCounter</span><span class="p">(</span><span class="kt">int</span> <span class="n">value</span><span class="p">)</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">=</span> <span class="n">value</span><span class="p">;</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Map</span><span class="o"><</span><span class="n">Events</span><span class="p">,</span> <span class="n">Function</span><span class="o">></span> <span class="kd">get</span> <span class="n">tasks</span> <span class="o">=></span> <span class="p">{</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">increment:</span> <span class="n">_setCounter</span><span class="p">,</span>
<span class="p">};</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>1.2 Это сообщение передается в бэкенд и обрабатывается там</p>
<pre><div class="codehilite"><pre><span></span><span class="kd">class</span> <span class="nc">FirstBackend</span> <span class="kd">extends</span> <span class="n">Backend</span><span class="o"><</span><span class="n">Events</span><span class="o">></span> <span class="p">{</span>
<span class="n">FirstBackend</span><span class="p">(</span><span class="n">SendPort</span> <span class="n">toFrontend</span><span class="p">)</span> <span class="o">:</span> <span class="k">super</span><span class="p">(</span><span class="n">toFrontend</span><span class="p">);</span>
<span class="kt">int</span> <span class="n">counter</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span>
<span class="kt">void</span> <span class="n">_increment</span><span class="p">(</span><span class="kt">int</span> <span class="n">diff</span><span class="p">)</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">+=</span> <span class="n">diff</span><span class="p">;</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">increment</span><span class="p">,</span> <span class="n">counter</span><span class="p">);</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Map</span><span class="o"><</span><span class="n">Events</span><span class="p">,</span> <span class="n">Function</span><span class="o">></span> <span class="kd">get</span> <span class="n">operations</span> <span class="o">=></span> <span class="p">{</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">increment:</span> <span class="n">_increment</span><span class="p">,</span>
<span class="p">};</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>1.3 Backend-стейт возвращает результат в реактивный стейт главного потока и готово! Есть два способа вернуть результат -- возврат ответа методом бэкенда (return) (тогда ответ будет отправлен с тем же ID сообщения, что и был получен), а второй -- явно вызвать метод send. При этом можно отправлять в реактивный стейт какие угодно сообщения с любыми, заданными вами ID. Главное -- чтобы этим ID были заданы методы-обработчики.</p>
<p>Схематично, первый способ выглядит так:</p>
<p><img alt="fa8cb4d343d4d72a24648469d52bd0d0_1-1801-34e85d.png" src="https://cdn.otus.ru/media/public/34/e8/fa8cb4d343d4d72a24648469d52bd0d0_1-1801-34e85d.png"></p>
<p>Желтая двусторонняя стрелка -- взаимодействие с какими-либо сервисами извне, например -- неким сервером. А фиолетовая, идущая от сервера к бэку -- это входящие сообщения от того же сервера, например -- WebSocket.</p>
<p><strong>2 Синхронное общение через вызов функции бэкенда по ее ID</strong></p>
<p>2.1 Frontend использует метод runBackendMethod , указывая ID, чтобы вызвать метод бэка, ему соответствующий, получая ответ тут же. В таком способе не обязательно даже указывать что-либо в списке задач (tasks) вашего фронта. При этом, как показано в коде ниже, вы можете переопределить метод onBackendResponse в вашем фронте, который вызывается после каждого получения вашим фронт-стейтом сообщений от бэка.</p>
<pre><div class="codehilite"><pre><span></span><span class="n">enum</span> <span class="n">Events</span> <span class="p">{</span>
<span class="n">decrement</span><span class="p">,</span>
<span class="p">}</span>
<span class="kd">class</span> <span class="nc">FirstState</span> <span class="kd">with</span> <span class="n">ChangeNotifier</span><span class="p">,</span> <span class="n">BackendMixin</span><span class="o"><</span><span class="n">Events</span><span class="o">></span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">counter</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">decrement</span><span class="p">([</span><span class="kt">int</span> <span class="n">diff</span> <span class="o">=</span> <span class="m">1</span><span class="p">])</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">runBackendMethod</span><span class="o"><</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">decrement</span><span class="p">,</span> <span class="n">diff</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// Automatically notification after any event from backend</span>
<span class="err">@</span><span class="n">override</span>
<span class="kt">void</span> <span class="n">onBackendResponse</span><span class="p">()</span> <span class="p">{</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>2.2 Backend-метод обрабатывает пришедшее событие, и просто возвращает результат. В данном случае есть одно ограничение -- методы бэка, вызываемые "синхронно", не должны вызывать метод send, с тем же ID, которому они соответствуют. В данном примере метод _decrement не должен вызывать метод send(Events.decrement). При этом любые другие сообщения он отправлять может.</p>
<pre><div class="codehilite"><pre><span></span><span class="kd">class</span> <span class="nc">FirstBackend</span> <span class="kd">extends</span> <span class="n">Backend</span><span class="o"><</span><span class="n">Events</span><span class="o">></span> <span class="p">{</span>
<span class="n">FirstBackend</span><span class="p">(</span><span class="n">SendPort</span> <span class="n">toFrontend</span><span class="p">)</span> <span class="o">:</span> <span class="k">super</span><span class="p">(</span><span class="n">toFrontend</span><span class="p">);</span>
<span class="kt">int</span> <span class="n">counter</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span>
<span class="c1">/// Or, you can simply return a value</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">int</span><span class="o">></span> <span class="n">_decrement</span><span class="p">(</span><span class="kt">int</span> <span class="n">diff</span><span class="p">)</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">-=</span> <span class="n">diff</span><span class="p">;</span>
<span class="k">return</span> <span class="n">counter</span><span class="p">;</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Map</span><span class="o"><</span><span class="n">Events</span><span class="p">,</span> <span class="n">Function</span><span class="o">></span> <span class="kd">get</span> <span class="n">operations</span> <span class="o">=></span> <span class="p">{</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">decrement:</span> <span class="n">_decrement</span><span class="p">,</span>
<span class="p">};</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Схема второго способа похожа на первый, за тем исключением, что во фронте вам не нужно писать обработчики событий, прилетающих с бэка.</p>
<p><img alt="fded86fa740396ea94dd9845cd3fa0e1_1-1801-36a02d.png" src="https://cdn.otus.ru/media/public/36/a0/fded86fa740396ea94dd9845cd3fa0e1_1-1801-36a02d.png"></p>
<h2>Что бы еще добавить...</h2>
<p>Чтобы использовать такую связку -- необходимо эти бэкенды создавать. Для этого в BackendMixin<EventType> заложен механизм создания бэка -- метод initBackend. В данный метод необходимо передать функцию-фабрику по созданию бэкенда. Это должна быть чистая функция высшего уровня (top-level, как гласит документация Flutter), либо статический метод класса. Время создания одного изолята ~200ms.</p>
<pre><div class="codehilite"><pre><span></span><span class="n">enum</span> <span class="n">Events</span> <span class="p">{</span>
<span class="n">increment</span><span class="p">,</span>
<span class="n">decrement</span><span class="p">,</span>
<span class="p">}</span>
<span class="kd">class</span> <span class="nc">FirstState</span> <span class="kd">with</span> <span class="n">ChangeNotifier</span><span class="p">,</span> <span class="n">BackendMixin</span><span class="o"><</span><span class="n">Events</span><span class="o">></span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">counter</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span>
<span class="kt">void</span> <span class="n">increment</span><span class="p">([</span><span class="kt">int</span> <span class="n">diff</span> <span class="o">=</span> <span class="m">1</span><span class="p">])</span> <span class="p">{</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">increment</span><span class="p">,</span> <span class="n">diff</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">decrement</span><span class="p">([</span><span class="kt">int</span> <span class="n">diff</span> <span class="o">=</span> <span class="m">1</span><span class="p">])</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">runBackendMethod</span><span class="o"><</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="o">></span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">decrement</span><span class="p">,</span> <span class="n">diff</span><span class="p">);</span>
<span class="p">}</span>
<span class="kt">void</span> <span class="n">_setCounter</span><span class="p">(</span><span class="kt">int</span> <span class="n">value</span><span class="p">)</span> <span class="p">{</span>
<span class="n">counter</span> <span class="o">=</span> <span class="n">value</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">initState</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="kd">await</span> <span class="n">initBackend</span><span class="p">(</span><span class="n">createFirstBackend</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// Automatically notification after any event from backend</span>
<span class="err">@</span><span class="n">override</span>
<span class="kt">void</span> <span class="n">onBackendResponse</span><span class="p">()</span> <span class="p">{</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Map</span><span class="o"><</span><span class="n">Events</span><span class="p">,</span> <span class="n">Function</span><span class="o">></span> <span class="kd">get</span> <span class="n">tasks</span> <span class="o">=></span> <span class="p">{</span>
<span class="n">Events</span><span class="p">.</span><span class="nl">increment:</span> <span class="n">_setCounter</span><span class="p">,</span>
<span class="p">};</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Пример функции-создателя Backend-части:</p>
<pre><div class="codehilite"><pre><span></span><span class="kd">typedef</span> <span class="n">Creator</span><span class="o"><</span><span class="n">TDataType</span><span class="o">></span> <span class="o">=</span> <span class="kt">void</span> <span class="n">Function</span><span class="p">(</span><span class="n">BackendArgument</span><span class="o"><</span><span class="n">TDataType</span><span class="o">></span> <span class="n">argument</span><span class="p">);</span>
<span class="kt">void</span> <span class="n">createFirstBackend</span><span class="p">(</span><span class="n">BackendArgument</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">argument</span><span class="p">)</span> <span class="p">{</span>
<span class="n">FirstBackend</span><span class="p">(</span><span class="n">argument</span><span class="p">.</span><span class="n">toFrontend</span><span class="p">);</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">protected</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">initBackend</span><span class="o"><</span><span class="n">TDataType</span> <span class="kd">extends</span> <span class="kt">Object</span><span class="o">></span><span class="p">(</span><span class="n">Creator</span><span class="o"><</span><span class="n">TDataType</span><span class="o">></span> <span class="n">creator</span><span class="p">,</span> <span class="p">{</span><span class="n">TDataType</span> <span class="n">data</span><span class="p">,</span> <span class="n">ErrorHandler</span> <span class="n">errorHandler</span><span class="p">})</span> <span class="kd">async</span> <span class="p">{</span>
<span class="c1">/// ...</span>
<span class="p">}</span>
</pre></div>
</pre>
<h2>Ограничения</h2>
<ul>
<li>Все тоже самое, что есть у обычного изолята</li>
<li>Для каждого создающегося "бэкенда" в данный момент создается свой изолят и при слишком большом количестве бэкендов -- время их создания становится ощутимым, особенно, если инициализировать все их, скажем, при загрузке приложения. Я проводил эксперименты, запуская одновременно 30 бэкендов -- время загрузки на указанном выше телефоне в --release режиме заняло 6 с небольшим секунд.</li>
<li>Есть некоторые сложности с обработкой ошибок, возникающих в изолятах (бэкендах). Тут, если вас заинтересует данный пакет, следует подробнее ознакомиться с методом initBackend из BackendMixin.</li>
<li>Сложность написания кода выше, по сравнению с хранением логики только в главном потоке</li>
</ul>
<h2>Чек-лист для использования</h2>
<p>Тут все просто, вам не нужно использовать изоляты (как отдельно, так и с помощью данного пакета), если:</p>
<ul>
<li>Производительность вашего приложения не падает при различных операциях</li>
<li>Для узких мест вам достаточно compute</li>
<li>Вам не хочется разбираться с изолятами</li>
<li>Цикл жизни вашего приложения настолько короткий, что нет смысла его оптимизировать</li>
</ul>
<p>В противном случае -- вы можете обратить свое внимание на данный подход и пакет, который упростит вашу работу с изолятами.</p>
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Ваш телефон <b><nobr class="js-phone-duplicate-phone"></nobr></b> уже
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Выберите учетную запись, с которой желаете продолжить работу.
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data-value="1"
data-event="Register;double_tel_ok"
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type="submit"
data-value="0"
data-event="Register;double_tel_ok"
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Войти в аккаунт <nobr class="js-phone-duplicate-acc"></nobr>
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<span class="new-input-line__error new-log-reg__popup-error js-error-text"></span>
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<form class="new-log-reg__popup-body js-email-terms-update js-form-in-modal"
action="/teacher/request/"
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Заполните номер телефона
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Для отправки заявки в преподаватели заполните номер телефона
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<input type="text"
class="new-input new-input_full js-placeholder js-input
js-required
"
maxlength="255"
name="phone"
autocomplete="off"
data-js-mask="phone"
required
placeholder="Телефон"
/>
<div class="new-input-error new-input-error_bottom js-validation-error hide "></div>
<div class="new-input-error new-input-error_info new-input-error_bottom hide"></div>
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</div>
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type="submit">Отправить
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