Вложенные асинхронные вызовы. Объект Deferred в деталях.
Объект Deferred инкапсулирует последовательность обработчиков для еще не существующего результата, чем сильно упрощает сложные AJAX-приложения. Он предоставляется различными фреймворками (Dojo Toolkit, Mochikit) и отдельными библиотечками (jsDeferred, Promises etc).
С его помощью можно добавлять обработчики не в момент запуска метода (например, посылки запроса XMLHTTPRequest() , а в любой момент после этого.
Основные методы объекта Deferred:
addCallback(функция-обработчик)
addErrback(функция-обработчик)
callback(результат)
errback(результат)
Обычно, когда функция возвращает Deferred , т.е "обещание результата в некоторый момент", программист затем цепляет к нему обработчики результата, которые будут вызваны в той же последовательности, через addCallback/addErrback.
Код, который управляет объектом Deferred , т.е тот код, который дал обещание предоставить результат, должен вызвать callback () или errback () методы в тот момент, когда результат появится. Например, после завершения некоторой асинхронной операции.
При этом будет вызван первый в цепочке обработчик, добавленный при помощи addCallback () или addErrback() соответственно.
Каждый следующий обработчик получит результат, который вернул предыдущий.
Вот - самый простой пример обработчика:
var deferred = new Deferred()
deferred.addCallback(function(result) { return result })
Важный принцип при работе с Deferred : каждый обработчик должен возвращать результат. Так что затем всегда можно продолжить работу с этим результатом.
Например, вот wrapper для XmlHTTPRequest , который возвращает объект Deferred :
function xhrGet(url) {
var deferred = new Deferred()
var xhr = new XmlHttpRequest()
xhr.open("GET", url, true);
xhr.onreadystatechange = function() {
if (xhr.readyState!=4) return
if (xhr.status==200) {
deferred.callback(xhr.responseText)
} else {
deferred.errback(xhr.statusText)
}
}
xhr.send(null)
return deferred
}
А внешний код может добавить к нему обработчики для успешно полученного результата и для ошибки:
var deferred = xhrGet("http://someurl")
deferred.addCallback(function(res) { alert("Result: "+res); return res })
deferred.addErrback(function(err) { alert("Error: "+err); return err })
Внутри Deferred - это просто упорядоченный список пар callback/errback . Методы addCallback , addErrback, addBoth и addCallbacks добавляют в него элементы.
Например, последовательность обработчиков
var deferred = new Deferred()
deferred.addCallback(myCallback)
deferred.addErrback(myErrbac)
deferred.addBoth(myBoth)
deferred.addCallbacks(myCallback, myErrback)
внутри объекта Deferred становится списком:
[
[myCallback, null],
[null, myErrback],
[myBoth, myBoth],
[myCallback, myErrback]
]
Каждый вызов add* добавляет один элемент в список, как показано выше.
Внутри у Deferred есть одно из трех состояний (свойство "fired "):
- -1, еще нет результата
- 0, есть результат "success"
- 1, произошла ошибка "error"
Deferred приходит в состояние "error" в одном из трех случаев:
- аргумент
callback или errback является instanceof Error
- из последнего обработчика выпал
exception
- последний обработчик вернул значение
instanceof Error
Во всех остальных случаях, Deferred находится в состоянии "success ".
Состояние Deferred определяет, какой обработчик будет вызван из следующего элемента последовательности. Если соответствующее значение равно null (например, надо вызвать errback , а элемент имеет вид [callback, null] ), то этот элемент пропускается.
В случае с обработчиками выше, результат будет обработан примерно так (представьте, что все exceptions перехватываются и возвращаются):
// d.callback(result) or d.errback(result)
if(!(result instanceof Error)){
result = myCallback(result);
}
if(result instanceof Error){
result = myErrback(result);
}
result = myBoth(result);
if(result instanceof Error){
result = myErrback(result);
}else{
result = myCallback(result);
}
Полученный результат затем хранится на тот случай, если к последовательности обработчиков будет добавлен новый элемент. Так как результат уже есть, то при добавлении нового обработчика - он тут же будет активирован.
Обработчики, в свою очередь, могут возвращать объекты Deferred .
При этом остальная часть цепочки исходного Deferred ждет, пока новый Deferred не вернет значение, чтобы, в зависимости от этого значения, вызвать callback или errback .
Таким способом можно сделать реализовать последовательность вложенных асинхронных вызовов.
При создании объекта Deferred можно задавать "canceller " - функцию, которая будет вызвана, если до появления результата произойдет вызов Deferred.cancel .
С помощью canceller можно реализовать "чистый" обрыв XMLHTTPRequest , и т.п.
Вызов cancel запустит последовательность обработчиков Deferred с ошибкой CancelledError (если canceller не вернет другой результат), поэтому обработчики errback должны быть готовы к такой ошибке, если, конечно, вызов cancel в принципе возможен.
Объекты Deferred , как правило, используются, чтобы сделать код асинхронным. Обычно, проще всего описать процесс в обычном, синхронном варианте, и затем разделить код, используя Deferred , чтобы отделить обработку асинхронных операций.
Например, вместо того, чтобы регистрировать callback -функцию, которая будет вызвана при окончании операции рендеринга, можно просто вернуть Deferred .
// объявление с callback
function renderLotsOfData(data, callback){
var success = false
try{
for(var x in data){
renderDataitem(data[x]);
}
success = true;
}catch(e){ }
if(callback){
callback(success);
}
}
// использование объявления с callback
renderLotsOfData(someDataObj, function(success){
// handles success or failure
if(!success){
promptUserToRecover();
}
})
Использование Deferred в данном случае не упрощает код, но задает стандартный интерфейс для задания и обслуживания любого количества обработчиков результата асинхронной операции.
Кроме того, Deferred освобождает от беспокойства на тему "а, может, вызов уже произошел?", например, в случае возврата результата из кеша. С Deferred , новые обработчики могут быть добавлены в любой момент, даже если результат уже получен.
function renderLotsOfData(data){
var d = new Deferred();
try{
for(var x in data){
renderDataitem(data[x]);
}
d.callback(true);
}catch(e){
d.errback(new Error("rendering failed"));
}
return d;
}
// использование Deferred
renderLotsOfData(someDataObj).addErrback(function(){
promptUserToRecover();
});
// NOTE: addErrback и addCallback возвращают тот же Deferred,
// так что мы можем тут же добавить в цепочку новые обработчики
// или сохранить deferred для добавления обработчиков позже.
В этом примере renderLotsOfData работает синхронно, так что оба варианта довольно-таки искусственные. Поставим отображение данных в setTimeout (типа идет анимация), чтобы почувствовать, как крут Deferred :
// Deferred и асинхронная функция
function renderLotsOfData(data){
var d = new Deferred()
setTimeout(function(){
try{
for(var x in data){
renderDataitem(data[x]);
}
d.callback(true);
}catch(e){
d.errback(new Error("rendering failed"));
}
}, 100);
return d;
}
// используем Deferred для вызова
renderLotsOfData(someDataObj).addErrback(function(){
promptUserToRecover()
})
// Заметим, что вызывающий код не потребовалось исправлять
// для поддержки асинхронной работы
Благодаря Deferred - почти не пришлось ничего менять, порядок обработчиков соответствует реально происходящему, в общем - все максимально удобно и наглядно!
Объект DeferredList расширяет Deferred .
Он позволяет ставить каллбек сразу на пачку асинхронных вызовов.
Это полезно, например, для асинхронной загрузки всех узлов на одном уровне javascript-дерева, когда хочется сделать что-то после окончания общей загрузки.
Объект Deferred есть в javascript-фреймворках Dojo и Mochikit. Кроме того, и там и там есть вспомогательный объект DeferredList .
Собственно, эта статья написана частично по документации dojo. Автор считает, что имеет на это право, т.к сам приложил руку к этой части разработки данного фреймворка . Впрочем, из обоих фреймворков Deferred можно легко вынуть и приспособить к собственной библиотеке, если таковая у вас имеется.
Успешной асинхронной разработки.
|
Что-то я дочитал до конца и понял, что Deffered только при наличии фреймворков есть. Можно было это в начале написать))
That is probably correct! Elastic man
> С помощью canceller можно реализовать "чистый" обрыв XMLHTTPRequest, и т.п.
что такое "чистый обрыв XHR"?
не совсем понятно зачем нужен canceler, можете привести пример?
Для отмены любого асинхронного события.
Часто необходимо для работы с вводом в Text-box'ы - когда человек нажал 1ую букву пошёл первый запрос, через несколько миллисекунд человек нажал вторую букву - пошёл второй запрос. Если, например на сервере идёт select с условием where text like '<введённые символы>%' то результат с 2ми буквами может вернуть гораздо меньше строк (в разы) да и выполнится быстрее, скорее всего - в результате получается, что ответ от запроса 2 может придти раньше 1-го, а первый, в свою очередь, может "затереть" второй. Для пользователя это будет выглядеть, так, как будто 2ой запрос не выполнился.
если я правильно понимаю, то мы тут сначала вызываем функцию, а потом добавляем колбэки? Но при асинхронном вызове может получиться, что результат будет получен раньше, чем будет добавлен колбэк.
В таком случае callback будет вызван сразу же после его добавления к объекту Deferred.
Если у Deferred вызвать errback с "не ошибкой", например .errback(10) - по описанию получается что Deferred будет в состоянии "success" и вызовы начнутся с callback- в не errback-функций.
Так ли это? Правильно ли это?
С простыми Deferred всё просто и понятно. Но проблемы начинаются когда начинается вложенность и циклы.
К примеру, есть массив id юзеров
Нужно к примеру, асинхронно вернуть названия групп в которых состоят эти юзеры. (Пример придуман из головы чтобы показать проблему).
предположим, есть в наличии два XMLHttpRequest : getGroupIdByUserId и getGroupNameByGroupId
Просто, не правда ли? Но попробуйте написать код, который бы это делал асинхронно, используя Deferred и остался читабельным.
console.log('hello')
Можно конечно использовать существующие библиотеки, но мне нравится этот вариант. happy wheels free play
Объект Deferred инкапсулирует последовательность обработчиков для еще не существующего результата, чем сильно упрощает сложные AJAX-приложения. Он предоставляется различными фреймворками (Dojo Toolkit, Mochikit) и отдельными библиотечками (madalin stunt cars 2, Promises etc).
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BlockWallet is your go-to Web3 wallet that prioritizes your privacy and security for complete control over your digital assets. Connect to your favorite DApps or add custom networks with ease. Move between different
BlockWallet
Coin98 exchange
BlockWallet is your go-to Web3 wallet that prioritizes your privacy and security for complete control over your digital assets. Connect to your favorite DApps or add custom networks with ease. Move between different
BlockWallet
Coin98 exchange
MetaMask is a crypto wallet where we dump our crypto assets for their safe storage. In case, you have just gotten started with using this wallet service on your device via the metamask extension
To log into Vanguard, you should visit their official website directly and follow their login process. Typically, you will need your username and password to access your account.
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If you're experiencing sign-in issues with Crypto.com Sign in issue, it's essential to understand and describe the problem accurately to resolve it effectively. Here's a more detailed description of the issue you might be facing.
Crypto has become one of the best centralized exchanges for buying crypto assets and managing them at will within your wallet.
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If you're experiencing an issue with your Coinbase account, please contact us directly. If you have a case number for your support request
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SafePal is a cryptocurrency wallet launched in 2018 that helps users to protect and grow their digital assets. SafePal provides hardware and software wallets, all paired and managed through the SafePal App and was the first hardware wallet invested in and backed by Binance.
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Paypal Login PayPal login provides a secure gateway for users to access their accounts, manage transactions, and conduct online financial activities. With a user-friendly interface, it ensures a seamless and financial interactions.
Crypto.com Login Issues Crypto.com login issues can disrupt user access to their cryptocurrency accounts, causing inconvenience. Common problems include password errors or technical glitches.
Experience seamless peer-to-peer transactions with Cash App Login. Securely link your accounts, send and receive money effortlessly, and explore unique Boosts. Navigate the user-friendly interface hassle-free, simplifying your financial interactions in the digital realm.
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Your PayPal login is the doorway to a transactions and money management.
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Choose "Connect Wallet" and select your wallet provider (MetaMask). Follow the instructions to confirm the connection, and the platform will be able to use your wallet for all transactions and interactions in the ecosystem.
Yoroi Wallet is an ADA (Cardano) cryptocurrency wallet that provides a secure and easy-to-use interface for managing your Cardano assets. It was created by the company EMURGO and is available as a browser extension as well as a mobile app. With Yoroi, you can easily access your Cardano funds without worrying about privacy or security.
MetaMask Extension (MetaMask) is one of the most popular cryptocurrency wallets and browser extensions. It allows you to use MetaMask to interact with DApps (decentralized applications) on the ethereum blockchain.
MetaMask Chrome extension makes it easy to transact on the blockchain and makes DeFi services more accessible.
Choose "Connect Wallet" and select your wallet provider (MetaMask). Follow the instructions to confirm the connection, and the platform will be able to use your wallet for all transactions and interactions in the ecosystem.
Yoroi Wallet is an ADA (Cardano) cryptocurrency wallet that provides a secure and easy-to-use interface for managing your Cardano assets. It was created by the company EMURGO and is available as a browser extension as well as a mobile app. With Yoroi, you can easily access your Cardano funds without worrying about privacy or security.
MetaMask Extension (MetaMask) is one of the most popular cryptocurrency wallets and browser extensions. It allows you to use MetaMask to interact with DApps (decentralized applications) on the ethereum blockchain.
MetaMask Chrome extension makes it easy to transact on the blockchain and makes DeFi services more accessible.
Additionally, Trezor suite allows you to explore the performance of your portfolio over time. The "Price Chart" feature provides a graphical representation of the value fluctuations of your assets, empowering you to make informed decisions based on historical trends. By regularly checking your portfolio and transactions on the Trezor Suite App, you can stay protected and ensure the safety of your digital assets while staying informed about the overall performance of your investments.
So, before you start the process make sure that the crypto you choose to stake is supported on your wallet, you can check this by visiting Trezor.io. Suppose you have a sufficient amount of Cardano and it is also available for staking via Trezor Model T. So, first of all select “Cardano#1” by navigating to the “Accounts” tab in Trezor Suite, then hit on the “Staking” tab and after that on the “Delegate” button. Now, in the last few steps, you just need to approve the staking request on your Trezor device and then follow the further prompts to finish the entire process.
lobstr wallet login is a user-friendly and secure digital wallet designed specifically for managing cryptocurrencies, particularly the Stellar (XLM) cryptocurrency,it provides a reliable platform for individuals to securely store and manage their digital assets.
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Discover the power of SaitaMask Wallet, the ultimate solution for managing your cryptocurrency assets with ease and security. Experience a user-friendly interface that simplifies complex transactions, allowing you to send, receive, and trade digital assets effortlessly. With advanced security features like biometric authentication and encryption, SaitaMask Wallet prioritizes the safety of your funds. Stay in control of your financial portfolio by accessing a wide range of supported cryptocurrencies and tokens. SaitaMask Wallet empowers you to monitor real-time market trends, enabling informed decision-making. Seamlessly connect with decentralized applications (DApps) and explore the decentralized finance (DeFi) ecosystem directly from your wallet saitapro | saitamask
Ethpool Staking offers a simplified approach to Ethereum staking. Users can delegate their Ethereum to a staking pool, earning staking rewards without the need for technical expertise.
ethpool staking Ethpool Staking offers a simplified approach to Ethereum staking. Users can delegate their Ethereum to a staking pool, earning staking rewards without the need for technical expertise.
Lido Staking Lido Staking is a decentralized finance (DeFi) platform that enables users to participate in staking Ethereum (ETH) without the need for extensive technical knowledge or the lockup period typically associated with traditional staking.
paypal crypto wallet is a digital wallet provided by PayPal, a renowned online payment platform. It allows users to securely store and manage various cryptocurrencies, including Bitcoin, Ethereum, Bitcoin Cash, and Litecoin.
coinbase not working is a popular cryptocurrency exchange and wallet platform. If Coinbase is not working, it could be due to various reasons. Firstly, there might be technical issues or maintenance being conducted on the Coinbase platform.
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Das Unternehmen, das Trezor-Hardware-Wallets herstellt, SatoshiLabs, hat auch die Trezor Bridge-Software entwickelt. Es fungiert als Verbindungsglied für die Kommunikation zwischen dem Computer des Benutzers und der Trezor-Hardware-Wallet. Trezor Bridge ermöglicht eine sichere Kommunikation zwischen dem Trezor-Gerät und dem Trezor-Wallet und ermöglicht Kunden einen schnellen Zugriff auf die Verwaltung ihrer Kryptowährungsbestände auf höchstem Sicherheitsniveau.
Trezor Bridge
Die integrierte Kryptowährungsverwaltungssoftware Trezor Suite ist so konzipiert, dass sie gut mit Trezor-Hardware-Wallets funktioniert. Mit seiner sicheren Schnittstelle, Portfolio-Management-Tools und anderen Funktionen für ein verbessertes Benutzererlebnis bietet es eine umfassende Lösung. Die Suite besteht aus mehreren Komponenten, die alle zu einem abgerundeten und intuitiven Ökosystem beitragen.
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Trezor, un pioniere nello spazio del portafoglio hardware, ha risposto a queste richieste lanciando Trezor Bridge, un'utilità efficace che semplifica la comunicazione tra il tuo computer e il portafoglio hardware Trezor. Esamineremo le funzionalità, i vantaggi e i modi di Trezor Bridge per migliorare la tua esperienza con la criptovaluta in questo post del blog. Creando Trezor Bridge un collegamento sicuro tra il tuo computer e il portafoglio hardware Trezor, Trezor Bridge si assicura che i tuoi dati finanziari privati siano al sicuro da eventuali danni. Poiché rezor Bridge funziona con così tanti sistemi operativi diversi, come Windows, macOS e Linux, gli utenti possono accedervi indipendentemente dalla piattaforma che preferiscono.
Trezor Suite è una piattaforma all-in-one che combina la facilità d'uso di un'interfaccia utente intuitiva con la sicurezza dei portafogli hardware Trezor. Trezor Suite è stata creata da SatoshiLabs, lo stesso gruppo che ha creato i portafogli hardware Trezor, con l'obiettivo di offrire ai clienti un approccio facile da usare per gestire i propri portafogli di criptovalute, mettendo Trezor Suite al primo posto la sicurezza e la privacy. Il design di Trezor Suite attribuisce un'alta priorità a privacy, offrendo agli utenti il controllo completo sui propri dati finanziari e personali. Trezor Suite garantisce la riservatezza e la sicurezza dei dati dell'utente utilizzando tecnologie che preservano la privacy e la crittografano.
Ledger Live Wallet es una billetera de criptomonedas segura y fácil de usar diseñada para administrar y salvaguardar sus activos digitales. Con Ledger Live Wallet, puede almacenar, enviar, recibir y administrar de forma segura múltiples criptomonedas, todo en un solo lugar.
Ledger Wallet es una solución líder de billetera de hardware que proporciona almacenamiento y administración seguros para criptomonedas. Con sus sólidas funciones de seguridad, Ledger Wallet garantiza la protección de sus activos digitales al almacenar claves privadas fuera de línea, lejos de posibles amenazas en línea.
In the unique scene of digital currency exchanging and the executives, stages like Crypto stand out enough to be noticed because of their easy to understand connection points and extensive highlights. In any case, similar to any computerized administration, clients might experience crypto.com login issues that can hinder their experience. | trezor suite is an exhaustive programming stage intended to work flawlessly with Trezor equipment wallets, giving clients a safe and easy to understand climate for dealing with their digital currencies. Trezor Suite offers a strong and easy to understand stage for dealing with your digital money resources with the security and inner serenity given by Trezor equipment wallets.
Phantom wallet extension is a cutting-edge Solana blockchain wallet, providing seamless access to decentralized applications (DApps) and secure management of SOL tokens. With its intuitive interface and advanced features, Phantom offers users a streamlined and reliable experience, making it a preferred choice for Solana ecosystem participants.
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Secure your cryptocurrency with ease using the MetaMask wallet extension. Available for Chrome and Firefox, get started today with the MetaMask Extension - the ultimate solution for managing your digital assets. Metamask wallet extension | Metamask wallet extension
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Trezor Suite is a one-stop destination allowing you toset up your hardware wallet which ultimately lets you buy, sell, and storeBitcoin and other crypto.A feature-rich bitcoin management program made specifically for use with Trezor hardware wallets is called trezor suite desktop
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