Во Flutter существует множество способов управления состоянием, но большинство из них строятся таким образом, что вся логика исполняется в главном изоляте вашего приложения. Исполнения сетевых запросов, работа с WebSocket, потенциально тяжелые синхронные операции (вроде локального поиска) все это, обычно, реализуют именно в главном изоляте. Эта статья покажет и другие двери.
Мне попадался всего один пакет, предназначенный для вынесения этих операций во внешние изоляты, но недавно появился и другой написанный мной). Предлагаю вам с ним ознакомиться.
В данной статье я буду оперировать двумя основными терминами -- изолят и главный поток. Они отличаются, чтобы текст не был слишком тавтологичен, но по существу, главный поток -- тоже изолят. Также тут вы найдете некоторые выражения, которые будут резать слух (или глаза) особенно чутким натурам, поэтому приношу заранее свои извинения -- извините. Также, называя в дальнейшем операции синхронными, я буду иметь в виду то, что результат вы будете получать в той же функции, в которой вызвали сторонний метод. А асинхронными -- такие функции, в которых на месте вы не получите результата, но получите его в другом.
Введение
Изоляты предназначены для исполнения кода в не основном потоке вашего приложения. Когда основной поток начинает исполнять сетевые запросы, производить вычисления или делать какие угодно операции, отличные от его главного предназначения -- отрисовки интерфейса, рано или поздно вы столкнетесь с тем, что драгоценное время на отрисовку одного кадра начнет увеличиваться. В основном, время, доступное вам для выполнения любой операции в главном потоке, ограничено ~16ms -- это окно, существующее между отрисовкой 2-х кадров при частоте 60FPS. Однако, в данный момент есть множество телефонов с большей частотой дисплея, и так, как у меня как раз такой -- тем интереснее будет сравнить производительность приложения при одних и тех же действиях с использованием разных подходов. В таком случае, окно равно уже ~11.11ms, а частота обновления дисплея 90FPS.
Исходные данные
Представим, что вам необходимо загрузить большой объем данных, вы можете сделать это несколькими способами:
- Просто осуществить запрос в главном потоке
- Использовать функцию compute для осуществления запроса
- Явно использовать изолят для запроса
Эксперименты проводились на смартфоне OnePlus 7 Pro, с процессором Snapdragon 855, и принудительно заданной частотой экрана в 90Hz. Приложение запускалось командой flutter run --profile. Проводилась эмуляция получения данных с сервера (5 одновременных запросов 10 раз подряд).
В одном запросе возвращается JSON -- массив из 2273 элементов, один из которых изображен на скриншоте. Размер ответа 1.12Mb. Таким образом, для 5 одновременных запросов получаем необходимость распарсить 5.6Mb JSON'а (но элементов в списке приложения будет 2273).
Параметры ответа сервера:
Давайте сравним все три способа по таким параметрам -- время отрисовки кадра, время операции, сложность организации/написания кода.
Пример первый: Пачка запросов из главного потока
Есть следующий код:
Future<void> loadItemsOnMainThread() async {
_startFpsMeter();
isLoading = true;
notifyListeners();
List<Item> mainThreadItems;
for (int i = 0; i < 10; i++) {
bench.startTimer('Load items in main thread');
mainThreadItems = await makeManyRequests(5);
final double diff = bench.endTimer('Load items in main thread');
requestDurations.add(diff);
}
items.clear();
items.addAll(mainThreadItems);
isLoading = false;
notifyListeners();
_stopFpsMeter();
requestDurations.clear();
}
Данный метод находится в реактивном стейте, исполняемом в главном изоляте приложения.
При выполнении кода выше получаем следующие значения:
- Среднее время отрисовки одного кадра -- 14,036ms / 71.25FPS
- Медианное время кадра -- 11.148ms / 89.70FPS
- Максимальное время отрисовки одного кадра -- 100,332ms / 9.97FPS
- Среднее время для выполнения 5 одновременных запросов -- 226.894ms
Пример второй: Compute
Future<void> loadItemsWithComputed() async {
_startFpsMeter();
isLoading = true;
notifyListeners();
List<Item> computedItems;
/// Реализовывались два варианта исполнения
/// каждая пачка из 5 одновременных запросов, запускаемых последовательно,
/// запускалась в функции compute
if (true) {
for (int i = 0; i < 10; i++) {
bench.startTimer('Load items in computed');
computedItems = await compute<dynamic, List<Item>>(_loadItemsWithComputed, null);
final double diff = bench.endTimer('Load items in computed');
requestDurations.add(diff);
}
/// Второй вариант -- все 10 запросов по 5 штук в одной функции compute
} else {
bench.startTimer('Load items in computed');
computedItems = await compute<dynamic, List<Item>>(_loadAllItemsWithComputed, null);
final double diff = bench.endTimer('Load items in computed');
requestDurations.add(diff);
}
items.clear();
items.addAll(computedItems);
isLoading = false;
notifyListeners();
_stopFpsMeter();
requestDurations.clear();
}
Future<List<Item>> _loadItemsWithComputed([dynamic _]) async {
return makeManyRequests(5);
}
Future<List<Item>> _loadAllItemsWithComputed([dynamic _]) async {
List<Item> items;
for (int i = 0; i < 10; i++) {
items = await makeManyRequests(5);
}
return items;
}
В данном примере такие же запросы запускались в двух вариантах: каждые 5 одновременных запросов из 10 последовательных запускались каждый в своем compute:
- Среднее время кадра -- 11.254ms / 88.86FPS
- Медианное время кадра -- 11.152ms / 89.67FPS
- Максимальное время кадра -- 22.304ms / 44.84FPS
- Среднее время для 5 одновременных запросов -- 386.253ms
Второй вариант -- все 10 последовательных запросов по 5 одновременных запускались в одном compute:
- Среднее время кадра -- 11.252ms / 88.87FPS
- Медианное время кадра -- 11.152ms / 89.67FPS
- Максимальное время кадра -- 22.306ms / 44.83FPS
Среднее время для 5 одновременных запросов (считалось, как выполнение всех 10 по 5 запросов в compute, деленное на 10) - 231.747ms
Пример третий: Isolate
Тут стоит сделать отступление: в терминологии пакета существует две части общего стейта (состояния):
- Frontend-стейт -- некий реактивный стейт, который отправляет сообщения в Backend, обрабатывает его ответы, а также хранит данные, после обновления которых обновляется и UI, а также он хранит легкие методы, которые вызываются из UI. Данный стейт работает в главном потоке приложения.
- Backend-стейт -- тяжелый стейт, получающий сообщения от фронта, выполняющий тяжелые операции, возвращающий ответы фронту и работающий в отдельном изоляте. Данный стейт также может хранить данные (тут, как вам захочется).
Код из третьего варианта разбит на несколько методов, по причине наличия необходимости общения с изолятом. Методы фронта показаны ниже:
/// Данный метод является точкой входа в операцию
Future<void> loadItemsWithIsolate() async {
/// Запускаем счетчик кадров перед всей операцией
_startFpsMeter();
isLoading = true;
notifyListeners();
/// Начинаем считать время запросов
bench.startTimer('Load items in separate isolate');
/// Отправляем событие в "тяжеловесную" часть стейта, запускаемую на изоляте
send(Events.startLoadingItems);
}
/// Обработчик события [Events.loadingItems] по обновлению времени запросов из изолята
void _middleLoadingEvent() {
final double time = bench.endTimer('Load items in separate isolate');
requestDurations.add(time);
bench.startTimer('Load items in separate isolate');
}
/// Обработчик завершающего события [Events.endLoadingItems] из изолята
Future<void> _endLoadingEvents(List<Item> items) async {
this.items.clear();
/// Обновляем данные в реактивном стейте
this.items.addAll(items);
/// Заканчиваем считать время запросов
final double time = bench.endTimer('Load items in separate isolate');
requestDurations.add(time);
isLoading = false;
notifyListeners();
/// Останавливаем счетчик кадров
_stopFpsMeter();
requestDurations.clear();
}
А тут вы можете увидеть метод бэка с нужной нам логикой:
/// Обработчик события [Events.startLoadingItems]
Future<void> _loadingItems() async {
_items.clear();
for (int i = 0; i < 10; i++) {
_items.addAll(await makeManyRequests(5));
if (i < (10 - 1)) {
/// Для всех запросов, кроме последнего - отсылаем только одно событие
send(Events.loadingItems);
} else {
/// Для последнего из 10ти запросов - отсылаем сообщение с данными
send(Events.endLoadingItems, _items);
}
}
}
Результаты:
- Среднее время кадра -- 11.151ms / 89.68FPS
- Медианное время кадра -- 11.151ms / 89.68FPS
- Максимальное время кадра -- 11.152ms / 89.67FPS
Промежуточные итоги
Проведя три эксперимента по загрузке в приложении одного и того же набора данных получаем такие показатели:
Судя по данным цифрам, можно сделать следующие выводы:
- Flutter способен обеспечивать стабильные ~90FPS
- Осуществление множества тяжелых сетевых запросов в главном потоке вашего приложения сказывается на его производительности -- появляются лаги
- Написание кода, исполняемого в главном потоке проще простого
- Compute позволяет уменьшить заметность лагов
- Написание кода с использованием Compute несет некоторые ограничения (чистые функции, нельзя передавать статические методы, нет замыкания и т.д.)
- Overhead при использовании compute по времени операции ~150-160ms
- Isolate позволяет полностью избавиться от лагов
- Написание кода с использованием изолятов сложнее, и также несет некоторые ограничения, о которых позднее
Давайте проведем еще один эксперимент, чтобы узнать наверняка, какой из способов оптимален по всем исследуемым параметрам. Его результат -- в следующей части нашей статьи.
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<div class="post-info__author">Михаил</div>
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<div class="post-info__time">02.10.21 в 10:04</div>
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<h1 class="blog__h1">Состояние Flutter на изолятах</h1>
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<a href="/nest/android/" class="post-info__blog" title="Android" >Android</a> →
<a href="/nest/andoird-art/" class="post-info__blog" title="Полезные материалы по Android" >Полезные материалы по Android</a>
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Теги: разработка мобильных приложений, flutter, dart
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<p>Во <strong>Flutter </strong>существует множество способов управления состоянием, но большинство из них строятся таким образом, что вся логика исполняется в главном изоляте вашего приложения. Исполнения сетевых запросов, работа с WebSocket, потенциально тяжелые синхронные операции (вроде локального поиска) все это, обычно, реализуют именно в главном изоляте. Эта статья покажет и другие двери. <cut></cut></p>
<p>Мне попадался всего один пакет, предназначенный для вынесения этих операций во внешние изоляты, но недавно появился и <a href="https://pub.dev/packages/isolator">другой</a> написанный мной). Предлагаю вам с ним ознакомиться.</p>
<p>В данной статье я буду оперировать двумя основными терминами -- <strong>изолят </strong>и <strong>главный поток</strong>. Они отличаются, чтобы текст не был слишком тавтологичен, но по существу, главный поток -- тоже изолят. Также тут вы найдете некоторые выражения, которые будут резать слух (или глаза) особенно чутким натурам, поэтому приношу заранее свои извинения -- извините. Также, называя в дальнейшем операции синхронными, я буду иметь в виду то, что результат вы будете получать в той же функции, в которой вызвали сторонний метод. А асинхронными -- такие функции, в которых на месте вы не получите результата, но получите его в другом.</p>
<p><img alt="1214fd4f15ce9ea52b0d246d6862b3ed_1-1801-01269a.png" src="https://cdn.otus.ru/media/public/01/26/1214fd4f15ce9ea52b0d246d6862b3ed_1-1801-01269a.png"></p>
<h2>Введение</h2>
<p>Изоляты предназначены для исполнения кода в не основном потоке вашего приложения. Когда основной поток начинает исполнять сетевые запросы, производить вычисления или делать какие угодно операции, отличные от его главного предназначения -- отрисовки интерфейса, рано или поздно вы столкнетесь с тем, что драгоценное время на отрисовку одного кадра начнет увеличиваться. В основном, время, доступное вам для выполнения любой операции в главном потоке, ограничено ~16ms -- это окно, существующее между отрисовкой 2-х кадров при частоте 60FPS. Однако, в данный момент есть множество телефонов с большей частотой дисплея, и так, как у меня как раз такой -- тем интереснее будет сравнить производительность приложения при одних и тех же действиях с использованием разных подходов. В таком случае, окно равно уже ~11.11ms, а частота обновления дисплея 90FPS.</p>
<h2>Исходные данные</h2>
<p>Представим, что вам необходимо загрузить большой объем данных, вы можете сделать это несколькими способами:</p>
<ul>
<li>Просто осуществить запрос в главном потоке</li>
<li>Использовать функцию compute для осуществления запроса</li>
<li>Явно использовать изолят для запроса</li>
</ul>
<p>Эксперименты проводились на смартфоне OnePlus 7 Pro, с процессором Snapdragon 855, и принудительно заданной частотой экрана в 90Hz. Приложение запускалось командой flutter run --profile. Проводилась эмуляция получения данных с сервера (5 одновременных запросов 10 раз подряд).</p>
<p>В одном запросе возвращается JSON -- массив из 2273 элементов, один из которых изображен на скриншоте. Размер ответа 1.12Mb. Таким образом, для 5 одновременных запросов получаем необходимость распарсить 5.6Mb JSON'а (но элементов в списке приложения будет 2273).</p>
<p>Параметры ответа сервера:</p>
<p><img alt="b7e8cce76a57eae9b9afb1ab8a64a2bf_1-1801-3bc96f.png" src="https://cdn.otus.ru/media/public/3b/c9/b7e8cce76a57eae9b9afb1ab8a64a2bf_1-1801-3bc96f.png"></p>
<p>Давайте сравним все три способа по таким параметрам -- время отрисовки кадра, время операции, сложность организации/написания кода.</p>
<h2>Пример первый: Пачка запросов из главного потока</h2>
<p>Есть следующий код:</p>
<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">loadItemsOnMainThread</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">_startFpsMeter</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">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">mainThreadItems</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">bench</span><span class="p">.</span><span class="n">startTimer</span><span class="p">(</span><span class="s1">'Load items in main thread'</span><span class="p">);</span>
<span class="n">mainThreadItems</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">makeManyRequests</span><span class="p">(</span><span class="m">5</span><span class="p">);</span>
<span class="kd">final</span> <span class="kt">double</span> <span class="n">diff</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 main thread'</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">diff</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">mainThreadItems</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">requestDurations</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Данный метод находится в реактивном стейте, исполняемом в главном изоляте приложения.</p>
<p>При выполнении кода выше получаем следующие значения:</p>
<ul>
<li>Среднее время отрисовки одного кадра -- 14,036ms / 71.25FPS</li>
<li>Медианное время кадра -- 11.148ms / 89.70FPS</li>
<li>Максимальное время отрисовки одного кадра -- 100,332ms / 9.97FPS</li>
<li>Среднее время для выполнения 5 одновременных запросов -- 226.894ms</li>
</ul>
<h2>Пример второй: 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">loadItemsWithComputed</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">_startFpsMeter</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">List</span><span class="o"><</span><span class="n">Item</span><span class="o">></span> <span class="n">computedItems</span><span class="p">;</span>
<span class="c1">/// Реализовывались два варианта исполнения</span>
<span class="c1">/// каждая пачка из 5 одновременных запросов, запускаемых последовательно,</span>
<span class="c1">/// запускалась в функции compute</span>
<span class="k">if</span> <span class="p">(</span><span class="kc">true</span><span class="p">)</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">bench</span><span class="p">.</span><span class="n">startTimer</span><span class="p">(</span><span class="s1">'Load items in computed'</span><span class="p">);</span>
<span class="n">computedItems</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">compute</span><span class="o"><</span><span class="kt">dynamic</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="p">(</span><span class="n">_loadItemsWithComputed</span><span class="p">,</span> <span class="kc">null</span><span class="p">);</span>
<span class="kd">final</span> <span class="kt">double</span> <span class="n">diff</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 computed'</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">diff</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// Второй вариант -- все 10 запросов по 5 штук в одной функции compute</span>
<span class="p">}</span> <span class="k">else</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 computed'</span><span class="p">);</span>
<span class="n">computedItems</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">compute</span><span class="o"><</span><span class="kt">dynamic</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="p">(</span><span class="n">_loadAllItemsWithComputed</span><span class="p">,</span> <span class="kc">null</span><span class="p">);</span>
<span class="kd">final</span> <span class="kt">double</span> <span class="n">diff</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 computed'</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">diff</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">computedItems</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">requestDurations</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="p">}</span>
<span class="n">Future</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="n">_loadItemsWithComputed</span><span class="p">([</span><span class="kt">dynamic</span> <span class="n">_</span><span class="p">])</span> <span class="kd">async</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">makeManyRequests</span><span class="p">(</span><span class="m">5</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">Future</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="n">_loadAllItemsWithComputed</span><span class="p">([</span><span class="kt">dynamic</span> <span class="n">_</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="n">Item</span><span class="o">></span> <span class="n">items</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">items</span> <span class="o">=</span> <span class="kd">await</span> <span class="n">makeManyRequests</span><span class="p">(</span><span class="m">5</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">items</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>В данном примере такие же запросы запускались в двух вариантах: каждые 5 одновременных запросов из 10 последовательных запускались каждый в своем compute:</p>
<ul>
<li>Среднее время кадра -- 11.254ms / 88.86FPS</li>
<li>Медианное время кадра -- 11.152ms / 89.67FPS</li>
<li>Максимальное время кадра -- 22.304ms / 44.84FPS</li>
<li>Среднее время для 5 одновременных запросов -- 386.253ms</li>
</ul>
<p>Второй вариант -- все 10 последовательных запросов по 5 одновременных запускались в одном compute:</p>
<ul>
<li>Среднее время кадра -- 11.252ms / 88.87FPS</li>
<li>Медианное время кадра -- 11.152ms / 89.67FPS</li>
<li>Максимальное время кадра -- 22.306ms / 44.83FPS</li>
</ul>
<p>Среднее время для 5 одновременных запросов (считалось, как выполнение всех 10 по 5 запросов в compute, деленное на 10) - 231.747ms</p>
<h2>Пример третий: Isolate</h2>
<p>Тут стоит сделать отступление: в терминологии пакета существует две части общего стейта (состояния):</p>
<ol>
<li>Frontend-стейт -- некий реактивный стейт, который отправляет сообщения в Backend, обрабатывает его ответы, а также хранит данные, после обновления которых обновляется и UI, а также он хранит легкие методы, которые вызываются из UI. Данный стейт работает в главном потоке приложения.</li>
<li>Backend-стейт -- тяжелый стейт, получающий сообщения от фронта, выполняющий тяжелые операции, возвращающий ответы фронту и работающий в отдельном изоляте. Данный стейт также может хранить данные (тут, как вам захочется).</li>
</ol>
<p>Код из третьего варианта разбит на несколько методов, по причине наличия необходимости общения с изолятом. Методы фронта показаны ниже:</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Данный метод является точкой входа в операцию</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">loadItemsWithIsolate</span><span class="p">()</span> <span class="kd">async</span> <span class="p">{</span>
<span class="c1">/// Запускаем счетчик кадров перед всей операцией</span>
<span class="n">_startFpsMeter</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="c1">/// Начинаем считать время запросов</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="c1">/// Отправляем событие в "тяжеловесную" часть стейта, запускаемую на изоляте</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">startLoadingItems</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">/// Обработчик события [Events.loadingItems] по обновлению времени запросов из изолята</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">/// Обработчик завершающего события [Events.endLoadingItems] из изолята</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="c1">/// Обновляем данные в реактивном стейте</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="c1">/// Заканчиваем считать время запросов</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">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="c1">/// Останавливаем счетчик кадров</span>
<span class="n">_stopFpsMeter</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 тут вы можете увидеть метод бэка с нужной нам логикой:</p>
<pre><div class="codehilite"><pre><span></span><span class="c1">/// Обработчик события [Events.startLoadingItems]</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">_loadingItems</span><span class="p">()</span> <span class="kd">async</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">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">_items</span><span class="p">.</span><span class="n">addAll</span><span class="p">(</span><span class="kd">await</span> <span class="n">makeManyRequests</span><span class="p">(</span><span class="m">5</span><span class="p">));</span>
<span class="k">if</span> <span class="p">(</span><span class="n">i</span> <span class="o"><</span> <span class="p">(</span><span class="m">10</span> <span class="o">-</span> <span class="m">1</span><span class="p">))</span> <span class="p">{</span>
<span class="c1">/// Для всех запросов, кроме последнего - отсылаем только одно событие</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">loadingItems</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="c1">/// Для последнего из 10ти запросов - отсылаем сообщение с данными</span>
<span class="n">send</span><span class="p">(</span><span class="n">Events</span><span class="p">.</span><span class="n">endLoadingItems</span><span class="p">,</span> <span class="n">_items</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Результаты:</p>
<ul>
<li>Среднее время кадра -- 11.151ms / 89.68FPS</li>
<li>Медианное время кадра -- 11.151ms / 89.68FPS</li>
<li>Максимальное время кадра -- 11.152ms / 89.67FPS</li>
</ul>
<h2>Промежуточные итоги</h2>
<p>Проведя три эксперимента по загрузке в приложении одного и того же набора данных получаем такие показатели:</p>
<p><img alt="1-1801-eef44c.png" src="https://cdn.otus.ru/media/public/ee/f4/1-1801-eef44c.png"></p>
<p>Судя по данным цифрам, можно сделать следующие выводы:</p>
<ul>
<li>Flutter способен обеспечивать стабильные ~90FPS</li>
<li>Осуществление множества тяжелых сетевых запросов в главном потоке вашего приложения сказывается на его производительности -- появляются лаги</li>
<li>Написание кода, исполняемого в главном потоке проще простого</li>
<li>Compute позволяет уменьшить заметность лагов</li>
<li>Написание кода с использованием Compute несет некоторые ограничения (чистые функции, нельзя передавать статические методы, нет замыкания и т.д.)</li>
<li>Overhead при использовании compute по времени операции ~150-160ms</li>
<li>Isolate позволяет полностью избавиться от лагов</li>
<li>Написание кода с использованием изолятов сложнее, и также несет некоторые ограничения, о которых позднее</li>
</ul>
<p>Давайте проведем еще один эксперимент, чтобы узнать наверняка, какой из способов оптимален по всем исследуемым параметрам. Его результат -- в <a href="https://otus.ru/nest/post/2309/">следующей части</a> нашей статьи. </p>
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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"
/>
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