Realaus Laiko Duomenų Atrakinimas su React experimental_useSubscription: Išsamus Gidas

const stockSource = {
  read(ticker) {
    // Imituojamas akcijų kainos gavimas iš API
    return getStockPrice(ticker);
  },
  subscribe(callback) {
    const intervalId = setInterval(() => {
      callback(); // Pranešti React, kad reikia pervaizduoti
    }, 1000); // Atnaujinti kas sekundę
    return () => clearInterval(intervalId); // Išvalymas atjungiant
  },
};

// Fiktyvi funkcija, imituojanti akcijų kainos gavimą
function getStockPrice(ticker) {
  // Tikroje programoje pakeiskite tikru API iškvietimu
  const randomPrice = Math.random() * 100;
  return { ticker, price: randomPrice.toFixed(2) };
}

import { unstable_useSubscription as useSubscription } from 'react';
import { useState } from 'react';

function StockTicker() {
  const [ticker, setTicker] = useState('AAPL');
  const stockData = useSubscription(stockSource, ticker);

  return (
    

      {stockData.ticker}: ${stockData.price}
      

       setTicker(e.target.value)}
      />
    
  );
}

export default StockTicker;

const documentSource = {
  read(documentId) {
    // Imituojamas dokumento turinio gavimas iš serverio
    return getDocumentContent(documentId);
  },
  subscribe(callback, documentId) {
    // Imituojamas WebSocket ryšys dokumentų atnaujinimams gauti
    const websocket = new WebSocket(`ws://example.com/documents/${documentId}`);

    websocket.onmessage = (event) => {
      // Kai per WebSocket ryšį gaunama nauja dokumento versija
      callback(); // Pranešti React, kad reikia pervaizduoti
    };

    return () => websocket.close(); // Išvalymas atjungiant
  },
};

// Fiktyvi funkcija, imituojanti dokumento turinio gavimą
function getDocumentContent(documentId) {
  // Tikroje programoje pakeiskite tikru API iškvietimu
  return `Document content for document ${documentId} - Version: ${Math.random().toFixed(2)}`;
}

import { unstable_useSubscription as useSubscription } from 'react';

function DocumentEditor({ documentId }) {
  const documentContent = useSubscription(documentSource, documentId);

  return (
    

          </div>
  );
}

export default DocumentEditor;
</pre></code>

<p>Šiame pavyzdyje <code>DocumentEditor</code> komponentas prenumeruoja <code>documentSource</code> naudodamas pateiktą <code>documentId</code>.  Kai imituojamas WebSocket ryšys gauna atnaujinimą, komponentas pervaizduojamas su naujausiu dokumento turiniu.</p>

<h3>3 Pavyzdys: Integracija su Redux Saugykla</h3>

<p><code>experimental_useSubscription</code> taip pat gali būti naudojamas prenumeruoti Redux saugyklos pakeitimus. Tai leidžia efektyviai atnaujinti komponentus, kai pasikeičia tam tikros Redux būsenos dalys.</p>

<p>Tarkime, turite Redux saugyklą su <code>user</code> dalimi:</p>

<code><pre>
// Redux saugyklos sąranka (supaprastinta)
import { createStore } from 'redux';

const initialState = {
  user: {
    name: 'John Doe',
    isLoggedIn: false,
  },
};

function reducer(state = initialState, action) {
  switch (action.type) {
    case 'UPDATE_USER':
      return { ...state, user: { ...state.user, ...action.payload } };
    default:
      return state;
  }
}

const store = createStore(reducer);
</pre></code>

<p>Dabar sukurkime <code>userSource</code>, kad prenumeruotume <code>user</code> dalies pakeitimus:</p>

<code><pre>
const userSource = {
  read() {
    return store.getState().user;
  },
  subscribe(callback) {
    const unsubscribe = store.subscribe(callback);
    return unsubscribe;
  },
};
</pre></code>

<p>Galiausiai, sukurkime React komponentą:</p>

<code><pre>
import { unstable_useSubscription as useSubscription } from 'react';
import { useDispatch } from 'react-redux';

function UserProfile() {
  const user = useSubscription(userSource);
  const dispatch = useDispatch();

  return (
    <div>
      <b>Vardas:</b> {user.name}
      <br />
      <b>Prisijungęs:</b> {user.isLoggedIn ? 'Taip' : 'Ne'}
      <button onClick={() => dispatch({ type: 'UPDATE_USER', payload: { isLoggedIn: !user.isLoggedIn } })}>Keisti prisijungimo būseną</button>
    </div>
  );
}

export default UserProfile;
</pre></code>

<p>Šiame pavyzdyje <code>UserProfile</code> komponentas prenumeruoja <code>userSource</code>. Kai Redux saugyklos <code>user</code> dalis pasikeičia, komponentas pervaizduojamas su atnaujinta vartotojo informacija.</p>

<h2>Pažangesni Aspektai ir Geriausios Praktikos</h2>

<ul>
  <li><b>Klaidų Tvarkymas:</b> Įdiekite patikimą klaidų tvarkymą savo <code>source</code> objekto <code>read</code> metode, kad sklandžiai apdorotumėte galimas klaidas gaunant duomenis.</li>
  <li><b>Našumo Optimizavimas:</b> Naudokite <code>shouldNotify</code> parinktį <code>config</code> objekte, kad išvengtumėte nereikalingų pervaizdavimų, kai duomenys iš tikrųjų nepasikeitė. Tai ypač svarbu sudėtingoms duomenų struktūroms.</li>
  <li><b>Serverio Pusės Atvaizdavimas (SSR):</b> Pateikite <code>getServerSnapshot</code> įgyvendinimą <code>config</code> objekte, kad užtikrintumėte, jog pradiniai duomenys būtų pasiekiami serveryje SSR metu.</li>
  <li><b>Duomenų Transformavimas:</b> Atlikite duomenų transformavimą <code>read</code> metode, kad užtikrintumėte, jog duomenys būtų tinkamo formato prieš juos naudojant komponente.</li>
  <li><b>Išteklių Išvalymas:</b> Užtikrinkite, kad tinkamai atsisakytumėte prenumeratos nuo duomenų šaltinio <code>subscribe</code> metodo išvalymo funkcijoje, kad išvengtumėte atminties nutekėjimo.</li>
</ul>

<h2>Globalūs Aspektai</h2>

<p>Kuriant programas su realaus laiko duomenimis pasaulinei auditorijai, atsižvelkite į šiuos dalykus:</p>

<ul>
  <li><b>Laiko Juostos:</b> Tinkamai tvarkykite laiko juostų konvertavimą rodydami laikui jautrius duomenis. Pavyzdžiui, akcijų kainų juosta turėtų rodyti kainas vartotojo vietos laiko juostoje.</li>
  <li><b>Valiutos Konvertavimas:</b> Pateikite valiutos konvertavimo parinktis rodydami finansinius duomenis. Apsvarstykite galimybę naudoti patikimą valiutų konvertavimo API, kad gautumėte realaus laiko valiutų kursus.</li>
  <li><b>Lokalizacija:</b> Lokalizuokite datos ir skaičių formatus pagal vartotojo lokalę.</li>
  <li><b>Tinklo Vėlavimas:</b> Būkite informuoti apie galimas tinklo vėlavimo problemas, ypač vartotojams regionuose su lėtesniu interneto ryšiu. Įdiekite metodus, tokius kaip optimistinis atnaujinimas ir kaupimas talpykloje (caching), siekiant pagerinti vartotojo patirtį.</li>
  <li><b>Duomenų Privatumas:</b> Užtikrinkite, kad tvarkydami vartotojo duomenis laikytumėtės duomenų privatumo taisyklių, tokių kaip GDPR ir CCPA.</li>
</ul>

<h2><code>experimental_useSubscription</code> Alternatyvos</h2>

<p>Nors <code>experimental_useSubscription</code> siūlo patogų būdą valdyti realaus laiko duomenis, egzistuoja keletas alternatyvių metodų:</p>

<ul>
  <li><b>Context API:</b> Context API gali būti naudojamas dalintis duomenimis tarp kelių komponentų. Tačiau jis gali būti ne toks efektyvus kaip <code>experimental_useSubscription</code> valdant dažnus atnaujinimus.</li>
  <li><b>Redux ar kitos Būsenos Valdymo Bibliotekos:</b> Redux ir kitos būsenos valdymo bibliotekos suteikia centralizuotą saugyklą programos būsenai valdyti. Jos gali būti naudojamos tvarkyti realaus laiko duomenis, tačiau gali įvesti papildomo sudėtingumo.</li>
  <li><b>Individualūs Kabliai su Įvykių Klausytojais (Event Listeners):</b> Galite sukurti individualius kablius, kurie naudoja įvykių klausytojus prenumeruoti duomenų šaltinius. Šis metodas suteikia daugiau kontrolės prenumeratos procesui, tačiau reikalauja daugiau standartinio kodo.</li>
</ul>

<h2>Išvada</h2>

<p><code>experimental_useSubscription</code> suteikia galingą ir efektyvų būdą valdyti realaus laiko duomenų prenumeratas React programose. Jo deklaratyvus pobūdis, optimizuotas našumas ir sklandi integracija su React komponentų gyvavimo ciklu daro jį vertingu įrankiu kuriant dinamiškas ir jautrias vartotojo sąsajas. Tačiau nepamirškite, kad tai yra eksperimentinė API, todėl atidžiai apsvarstykite jos stabilumą prieš diegiant ją gamybinėse aplinkose.</p>

<p>Suprasdami šiame gide aprašytus principus ir geriausias praktikas, galite išnaudoti <code>experimental_useSubscription</code>, kad atskleistumėte visą realaus laiko duomenų potencialą savo React programose, kurdami įtraukiančias ir informatyvias patirtis vartotojams visame pasaulyje.</p>

<h2>Tolimesnis Nagrinėjimas</h2>

<ul>
 <li><b>React Dokumentacija:</b> Sekite oficialią React dokumentaciją dėl atnaujinimų apie <code>experimental_useSubscription</code>.</li>
 <li><b>Bendruomenės Forumai:</b> Dalyvaukite React bendruomenės forumuose ir diskusijų lentose, kad pasimokytumėte iš kitų kūrėjų patirties su šiuo kabliu.</li>
 <li><b>Eksperimentavimas:</b> Geriausias būdas mokytis – tai daryti. Eksperimentuokite su <code>experimental_useSubscription</code> savo projektuose, kad giliau suprastumėte jo galimybes ir apribojimus.</li>
</ul></div><footer class="mt-12 pt-8 border-t border-gray-200"><h3 class="text-sm font-semibold text-gray-900 mb-3 dark:text-white/90">Tags:</h3><div class="flex flex-wrap gap-2"><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">React</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">experimental_useSubscription</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">prenumeratos kablys</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">realaus laiko duomenys</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">būsenos valdymas</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">našumo optimizavimas</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">duomenų gavimas</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">asinchroniniai duomenys</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">React kabliai</span><span class="inline-block bg-gray-100 text-gray-800 px-3 py-1 rounded-full text-sm hover:bg-gray-200 transition-colors dark:bg-neutral-800 dark:text-white dark:hover:bg-neutral-700">JavaScript</span></div></footer></article></div><script>$RS=function(a,b){a=document.getElementById(a);b=document.getElementById(b);for(a.parentNode.removeChild(a);a.firstChild;)b.parentNode.insertBefore(a.firstChild,b);b.parentNode.removeChild(b)};$RS("S:2","P:2")</script><script>$RB=[];$RV=function(b){$RT=performance.now();for(var a=0;a<b.length;a+=2){var c=b[a],e=b[a+1];null!==e.parentNode&&e.parentNode.removeChild(e);var f=c.parentNode;if(f){var g=c.previousSibling,h=0;do{if(c&&8===c.nodeType){var d=c.data;if("/$"===d||"/&"===d)if(0===h)break;else h--;else"$"!==d&&"$?"!==d&&"$~"!==d&&"$!"!==d&&"&"!==d||h++}d=c.nextSibling;f.removeChild(c);c=d}while(c);for(;e.firstChild;)f.insertBefore(e.firstChild,c);g.data="$";g._reactRetry&&g._reactRetry()}}b.length=0};
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