{"id":8299,"date":"2025-01-28T15:09:16","date_gmt":"2025-01-28T14:09:16","guid":{"rendered":"https:\/\/sapinnov.com\/?p=8299"},"modified":"2025-03-03T15:40:45","modified_gmt":"2025-03-03T14:40:45","slug":"faut-il-utiliser-les-promesses-javasript","status":"publish","type":"post","link":"https:\/\/sapinnov.com\/index.php\/2025\/01\/28\/faut-il-utiliser-les-promesses-javasript\/","title":{"rendered":"Faut-il utiliser les promesses JavaSript ?"},"content":{"rendered":"\n<p>Dans le d\u00e9veloppement des applications SAPUI5 Fiori, la gestion des op\u00e9rations asynchrones est essentielle pour offrir une exp\u00e9rience utilisateur fluide et r\u00e9active. Qu&rsquo;il s&rsquo;agisse de r\u00e9cup\u00e9rer des donn\u00e9es depuis un service OData ou d&rsquo;effectuer des appels API, l&rsquo;asynchrone est au c\u0153ur de la logique de ces applications. Cependant, sa gestion peut rapidement devenir complexe et difficile \u00e0 maintenir si elle n&rsquo;est pas correctement ma\u00eetris\u00e9e.<\/p>\n\n\n\n<p>Dans cet article, nous passerons en revue les principaux concepts de l&rsquo;asynchrone en JavaScript et explorerons les meilleures pratiques ainsi que les erreurs courantes \u00e0 \u00e9viter, afin de simplifier et d&rsquo;am\u00e9liorer la gestion des op\u00e9rations asynchrones dans vos projets SAPUI5.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction \u00e0 l&rsquo;asynchronie et aux promesses en JavaScript<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Explication simple du concept d&rsquo;asynchronie en JavaScript (bloquant vs non bloquant)<\/h3>\n\n\n\n<p>Traditionnellement, le code JavaScript s&rsquo;ex\u00e9cute de mani\u00e8re synchrone, ligne par ligne, chaque instruction bloquant l&rsquo;ex\u00e9cution du reste du code jusqu&rsquo;\u00e0 son ach\u00e8vement. Cependant, pour les op\u00e9rations longues comme les requ\u00eates r\u00e9seau, cela peut poser probl\u00e8me. L&rsquo;asynchronie permet d&rsquo;\u00e9viter de bloquer le fil d&rsquo;ex\u00e9cution principal en traitant les t\u00e2ches longues en arri\u00e8re-plan, tout en laissant le reste du code continuer \u00e0 s&rsquo;ex\u00e9cuter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">D\u00e9finition et r\u00f4le des promesses<\/h3>\n\n\n\n<p>Les promesses permettent de g\u00e9rer l&rsquo;asynchronie en JavaScript ; elles repr\u00e9sentent le r\u00e9sultat ou l&rsquo;\u00e9chec d&rsquo;une op\u00e9ration asynchrone. Une promesse peut \u00eatre dans l&rsquo;un des trois \u00e9tats suivants :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pending (En attente)<\/strong> : \u00c9tat initial, la promesse n&rsquo;est ni accomplie ni rejet\u00e9e.<\/li>\n\n\n\n<li><strong>Fulfilled (Accomplie)<\/strong> : L&rsquo;op\u00e9ration a r\u00e9ussi.<\/li>\n\n\n\n<li><strong>Rejected (Rejet\u00e9e)<\/strong> : L&rsquo;op\u00e9ration a \u00e9chou\u00e9.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi l&rsquo;asynchronie est-elle largement utilis\u00e9e dans Fiori ?<\/h2>\n\n\n\n<p>La biblioth\u00e8que de composants SAPUI5 encapsule ces concepts au sein de fonctions de rappel (<em>callbacks<\/em>). En effet, les fonctions callback \u00ab <em>success<\/em> \u00bb et \u00ab <em>error<\/em> \u00bb proviennent des promesses g\u00e9r\u00e9es par le framework SAPUI5. Dans la plupart des cas, il suffit de mettre en \u0153uvre ces deux m\u00e9thodes. Cependant, certaines situations n\u00e9cessitent une gestion manuelle des promesses.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Parall\u00e9lisation des fonctions de rappel (<em>Promise.all<\/em>)<\/h3>\n\n\n\n<p>Lorsque plusieurs appels asynchrones doivent \u00eatre effectu\u00e9s simultan\u00e9ment, <em>Promise.all<\/em> permet de les ex\u00e9cuter en parall\u00e8le. Cela r\u00e9duit le temps d&rsquo;attente total en lan\u00e7ant toutes les requ\u00eates en m\u00eame temps et en attendant leur r\u00e9solution collective.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>_getProducts: function () {\n  return new Promise((resolve, reject) =&gt; {\n    oDataModel.read(\"\/Products\", {\n      success: function (oData, oResponse) {\n        resolve(oData, oResponse);\n      },\n      error: function (oError) {\n        reject(oError);\n      }\n    });\n  });\n},\n\n_getSites: function () {\n  return new Promise((resolve, reject) =&gt; {\n    oDataModel.read(\"\/Sites\", {\n      success: function (oData, oResponse) {\n        resolve(oData, oResponse);\n      },\n      error: function (oError) {\n        reject(oError);\n      }\n    });\n  });\n},\n\n_getProductsBySites: function () {\n  Promise.all(&#91;\n    this._getProducts(),\n    this._getSites()\n  ])\n  .then((results) =&gt; {\n    \/\/ do something with products and sites\n  })\n  .catch((error) =&gt; {\n    \/\/ error retrieving products or sites\n  });\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Utilisation d&rsquo;une fonction asynchrone avec diff\u00e9rents r\u00e9sultats<\/h3>\n\n\n\n<p>La fonction \u00ab <em>success<\/em> \u00bb fournie par SAPUI5 permet d&rsquo;impl\u00e9menter une logique unique \u00e0 ex\u00e9cuter apr\u00e8s une fonction asynchrone. Cependant, il arrive que l&rsquo;on souhaite r\u00e9utiliser la m\u00eame fonction dans diff\u00e9rents sc\u00e9narios. Dans de tels cas, utiliser une promesse avec son \u00ab <em>then<\/em> \u00bb s&rsquo;av\u00e8re plus pratique.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>_getProductsPrices: function () {\n  return new Promise((resolve, reject) =&gt; {\n    oDataModel.read(\"\/ProductsPrices\", {\n      success: function (oData, oResponse) {\n        resolve(oData, oResponse);\n      },\n      error: function (oError) {\n        reject(oError);\n      }\n    });\n  });\n},\n\n_computeTotalPrice: function () {\n  this._getProductsPrices().then((oData, oResponse) =&gt; {\n    \/\/ sum products prices for example\n  });\n},\n\n_getMostExpensiveProduct: function () {\n  this._getProductsPrices().then((oData, oResponse) =&gt; {\n    \/\/ search for the highest price for example\n  });\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Gestion de l&rsquo;\u00e9tat des donn\u00e9es et de l&rsquo;\u00e9tat de l&rsquo;application<\/h3>\n\n\n\n<p>L&rsquo;asynchronie aide \u00e9galement \u00e0 mieux g\u00e9rer l&rsquo;\u00e9tat de l&rsquo;application, notamment en affichant des indicateurs de chargement (comme des points de chargement) pendant la r\u00e9cup\u00e9ration des donn\u00e9es. Cela permet d&rsquo;informer l&rsquo;utilisateur sur l&rsquo;\u00e9tat de l&rsquo;application et d&rsquo;am\u00e9liorer son exp\u00e9rience.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quelles sont les bonnes pratiques et les choses \u00e0 \u00e9viter ?<\/h2>\n\n\n\n<p><strong>Bonnes pratiques :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>G\u00e9rer correctement les erreurs pour capturer toutes les exceptions potentielles.<\/li>\n\n\n\n<li>Utiliser <code>Promise.all()<\/code> pour effectuer des appels parall\u00e8les lorsque cela est n\u00e9cessaire.<\/li>\n\n\n\n<li>Privil\u00e9gier les promesses au lieu de dupliquer du code.<\/li>\n<\/ul>\n\n\n\n<p><strong>Choses \u00e0 \u00e9viter :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Utiliser des callbacks imbriqu\u00e9s, ce qui rend le code difficile \u00e0 maintenir et \u00e0 d\u00e9boguer.<\/li>\n\n\n\n<li>Surcharger le thread principal avec trop d&rsquo;op\u00e9rations lourdes en parall\u00e8le sans limiter la charge.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Comparaison entre les anciennes techniques comme les callbacks et les nouvelles approches bas\u00e9es sur les promesses<\/h3>\n\n\n\n<p>Avec l&rsquo;av\u00e8nement des promesses, puis de <code>async\/await<\/code>, bas\u00e9 sur les promesses, le code est devenu beaucoup plus lin\u00e9aire et plus facile \u00e0 lire. <code>async\/await<\/code> permet d&rsquo;\u00e9crire du code asynchrone comme s&rsquo;il \u00e9tait synchrone, ce qui le rend encore plus lisible et r\u00e9duit le risque d&rsquo;erreurs.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Example using promises with async\/await\nfunction task1() {\n  return new Promise(resolve =&gt; {\n    setTimeout(() =&gt; {\n      console.log(\"Task 1 completed\");\n      resolve();\n    }, 1000);\n  });\n}\n\nfunction task2() {\n  return new Promise(resolve =&gt; {\n    setTimeout(() =&gt; {\n      console.log(\"Task 2 completed\");\n      resolve();\n    }, 1000);\n  });\n}\n\nfunction task3() {\n  return new Promise(resolve =&gt; {\n    setTimeout(() =&gt; {\n      console.log(\"Task 3 completed\");\n      resolve();\n    }, 1000);\n  });\n}\n\n\/\/ Using async\/await to handle async tasks in a more readable way\nasync function executeTasks() {\n  await task1();\n  await task2();\n  await task3();\n  console.log(\"All tasks completed\");\n}\n\nexecuteTasks();<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Am\u00e9lioration de la lisibilit\u00e9 et de la gestion des erreurs par rapport aux callbacks imbriqu\u00e9s (pyramide de la mort)<\/h3>\n\n\n\n<p>Avant l&rsquo;introduction des promesses, la gestion de l&rsquo;asynchronie se faisait souvent \u00e0 l&rsquo;aide de callbacks. Cependant, cette approche posait des probl\u00e8mes de lisibilit\u00e9 et rendait la maintenance du code difficile. L&rsquo;imbrication des fonctions les unes dans les autres cr\u00e9ait une v\u00e9ritable pyramide de code difficile \u00e0 suivre (aussi appel\u00e9e <strong>callback hell<\/strong>).<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Fonction pour obtenir les donn\u00e9es du client\n_getCustomerData: function () {\n  return new Promise((resolve, reject) =&gt; {\n    oDataModel.read(\"\/CustomerSet\", {\n      success: function (oData, oResponse) {\n        console.log(\"Customer data retrieved successfully\");\n        resolve(oData);\n      },\n      error: function (oError) {\n        reject(oError);\n      }\n    });\n  });\n},\n\n\/\/ Fonction pour obtenir les commandes d'un client\n_getOrderData: function (customerId) {\n  return new Promise((resolve, reject) =&gt; {\n    oDataModel.read(`\/OrderSet(CustomerID='${customerId}')`, {\n      success: function (oData, oResponse) {\n        console.log(\"Order data retrieved successfully\");\n        resolve(oData);\n      },\n      error: function (oError) {\n        reject(oError);\n      }\n    });\n  });\n},\n\n\/\/ Fonction pour obtenir les produits d'une commande\n_getProductData: function (orderId) {\n  return new Promise((resolve, reject) =&gt; {\n    oDataModel.read(`\/ProductSet(OrderID='${orderId}')`, {\n      success: function (oData, oResponse) {\n        console.log(\"Product data retrieved successfully\");\n        resolve(oData);\n      },\n      error: function (oError) {\n        reject(oError);\n      }\n    });\n  });\n},\n\n\/\/ Exemple de .then() imbriqu\u00e9\n_getCustomerOrderProductData: function () {\n  this._getCustomerData()\n    .then((customerData) =&gt; {\n      \/\/ Imbriquer un autre .then() pour r\u00e9cup\u00e9rer les commandes du client\n      return this._getOrderData(customerData.CustomerID)\n        .then((orderData) =&gt; {\n          \/\/ Imbriquer un autre .then() pour r\u00e9cup\u00e9rer les produits de la commande\n          return this._getProductData(orderData.OrderID)\n            .then((productData) =&gt; {\n              console.log(\"Final product data:\", productData);\n            })\n            .catch((error) =&gt; {\n              console.error(\"Error retrieving product data:\", error);\n            });\n        })\n        .catch((error) =&gt; {\n          console.error(\"Error retrieving order data:\", error);\n        });\n    })\n    .catch((error) =&gt; {\n      console.error(\"Error retrieving customer data:\", error);\n    });\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Une bonne gestion des op\u00e9rations asynchrones dans le d\u00e9veloppement d&rsquo;applications SAPUI5 Fiori est essentielle pour garantir une exp\u00e9rience utilisateur optimale et r\u00e9active. En ma\u00eetrisant les concepts fondamentaux de l&rsquo;asynchronie en JavaScript et en appliquant les bonnes pratiques, vous pouvez acc\u00e9l\u00e9rer les performances, simplifier la gestion des appels r\u00e9seau et am\u00e9liorer la lisibilit\u00e9 du code. L&rsquo;utilisation appropri\u00e9e de m\u00e9canismes tels que les promesses, <code>Promise.all<\/code> et la nouvelle syntaxe <code>async\/await<\/code> permet de rendre votre code plus robuste et plus facile \u00e0 maintenir. En appliquant ces principes \u00e0 vos projets SAPUI5, vous offrirez non seulement des applications performantes mais vous faciliterez \u00e9galement la gestion et l&rsquo;\u00e9volution de vos solutions sur le long terme.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans le d\u00e9veloppement des applications SAPUI5 Fiori, la gestion des op\u00e9rations asynchrones est essentielle pour&#8230;<\/p>\n","protected":false},"author":7,"featured_media":8301,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42],"tags":[64,73,74,44],"class_list":{"0":"post-8299","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-sap-fiori","8":"tag-javascript","9":"tag-performances","10":"tag-promesses","11":"tag-sapui5"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Faut-il utiliser les promesses JavaSript ? - SAPINNOV - Conseil et d\u00e9veloppement SAP Fiori &amp; 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