{"id":95745,"date":"2022-10-21T11:27:04","date_gmt":"2022-10-21T09:27:04","guid":{"rendered":"https:\/\/rmarketingdigital.com\/javascript\/explicando-todo-acerca-de-cqrs\/"},"modified":"2020-12-08T00:12:20","modified_gmt":"2020-12-08T03:12:20","slug":"explicando-todo-acerca-de-cqrs","status":"publish","type":"post","link":"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/","title":{"rendered":"Tout expliquer sur le CQRS"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Basculer la table des mati\u00e8res\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Basculer<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/#%C2%BFQue-es-CQRS\" >Qu&#039;est-ce que le CQRS?<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/#El-nivel-de-segregacion-puede-variar-en-los-sistemas-CQRS\" >Le niveau de s\u00e9gr\u00e9gation peut varier dans les syst\u00e8mes CQRS:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/#%C2%BFPor-que-y-cuando-usar-CQRS\" >Pourquoi et quand utiliser le CQRS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/#Un-ejemplo-muy-vivido\" >Un exemple tr\u00e8s frappant<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/#CQRS-y-su-fuente-de-eventos\" >CQRS et sa source d&#039;\u00e9v\u00e9nements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/#Base-de-datos-de-informes-%E2%80%93-Denormalizer\" >Base de donn\u00e9es de rapports - Denormalizer<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/rmarketingdigital.com\/fr\/javascript\/explicando-todo-acerca-de-cqrs\/#Outro\" >Autre<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<div itemprop=\"articleBody\">\n<p>Le CQRS est un tr\u00e8s bon outil en mati\u00e8re de programmation. Il est vraiment utile et peut vous faciliter beaucoup de choses, continuez \u00e0 lire et apprenez tout sur le CQRS.<span id=\"more-108\"\/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-CQRS\"><\/span>Qu&#039;est-ce que le CQRS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>CQRS est un mod\u00e8le architectural, o\u00f9 l&#039;acronyme signifie Command Query Responsibility Segregation. Nous pouvons parler de CQRS lorsque les op\u00e9rations de lecture de donn\u00e9es sont s\u00e9par\u00e9es des op\u00e9rations d&#039;\u00e9criture de donn\u00e9es et se produisent sur une interface diff\u00e9rente.<\/p>\n<p>Dans la plupart des syst\u00e8mes CQRS, les op\u00e9rations de lecture et d&#039;\u00e9criture utilisent diff\u00e9rents mod\u00e8les de donn\u00e9es, parfois m\u00eame des magasins de donn\u00e9es diff\u00e9rents. Ce type de s\u00e9gr\u00e9gation facilite la mise \u00e0 l&#039;\u00e9chelle, la lecture et l&#039;\u00e9criture des op\u00e9rations et le contr\u00f4le de la s\u00e9curit\u00e9, mais ajoute une complexit\u00e9 suppl\u00e9mentaire \u00e0 votre syst\u00e8me.<\/p>\n<p>Node.js at Scale, est une collection d&#039;articles qui se concentrent sur les besoins des entreprises disposant d&#039;installations Node.js plus importantes et de Node avanc\u00e9.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"El-nivel-de-segregacion-puede-variar-en-los-sistemas-CQRS\"><\/span>Le niveau de s\u00e9gr\u00e9gation peut varier dans les syst\u00e8mes CQRS:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>Stockages de donn\u00e9es uniques et mod\u00e8le s\u00e9par\u00e9 pour la lecture et la mise \u00e0 jour des donn\u00e9es.<\/li>\n<li>Magasins de donn\u00e9es s\u00e9par\u00e9s et mod\u00e8le s\u00e9par\u00e9 pour la lecture et la mise \u00e0 jour des donn\u00e9es.<\/li>\n<\/ul>\n<p>Dans la s\u00e9paration de magasin de donn\u00e9es la plus simple, nous pouvons utiliser des r\u00e9plicas en lecture seule pour r\u00e9aliser la s\u00e9gr\u00e9gation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%C2%BFPor-que-y-cuando-usar-CQRS\"><\/span>Pourquoi et quand utiliser le CQRS?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Dans un syst\u00e8me de gestion de donn\u00e9es typique, toutes les op\u00e9rations CRUD (cr\u00e9er une mise \u00e0 jour de lecture de suppression) s&#039;ex\u00e9cutent sur la m\u00eame interface d&#039;entit\u00e9s dans un seul magasin de donn\u00e9es. Comment cr\u00e9er, mettre \u00e0 jour, interroger et supprimer des lignes de table dans une base de donn\u00e9es SQL via le m\u00eame mod\u00e8le.<\/p>\n<p>Le CQRS brille vraiment par rapport \u00e0 l&#039;approche traditionnelle (utilisant un mod\u00e8le unique) lors de la cr\u00e9ation de mod\u00e8les de donn\u00e9es complexes \u00e0 valider et r\u00e9pond \u00e0 votre logique m\u00e9tier lorsque la manipulation des donn\u00e9es se produit. Les op\u00e9rations de lecture par rapport aux op\u00e9rations de mise \u00e0 jour et d&#039;\u00e9criture peuvent \u00eatre tr\u00e8s diff\u00e9rentes ou beaucoup plus simples, comme acc\u00e9der uniquement \u00e0 un sous-ensemble de vos donn\u00e9es.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Un-ejemplo-muy-vivido\"><\/span>Un exemple tr\u00e8s frappant<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Dans notre outil de surveillance Node.js, nous utilisons CQRS pour s\u00e9parer le stockage et la repr\u00e9sentation des donn\u00e9es. Par exemple, lorsque vous affichez une visualisation de suivi distribu\u00e9 dans notre interface utilisateur, les donn\u00e9es qui la sous-tendent sont arriv\u00e9es en petits morceaux depuis les agents d&#039;application de nos clients vers notre API Public Collector.<\/p>\n<p>Dans l&#039;API Collector, nous effectuons simplement une validation fine et envoyons les donn\u00e9es \u00e0 une file d&#039;attente de messagerie pour traitement. \u00c0 l&#039;autre extr\u00e9mit\u00e9 de la file d&#039;attente, les travailleurs consomment des messages et r\u00e9solvent toutes les d\u00e9pendances n\u00e9cessaires via d&#039;autres services. Ces travailleurs enregistrent \u00e9galement les donn\u00e9es transform\u00e9es dans la base de donn\u00e9es.<\/p>\n<p>En cas de probl\u00e8me, nous renvoyons le message avec un repli exponentiel et une limite maximale \u00e0 notre file d&#039;attente de messagerie. Par rapport \u00e0 ce flux d&#039;\u00e9criture de donn\u00e9es complexe, du c\u00f4t\u00e9 rendu du flux, nous interrogeons uniquement une base de donn\u00e9es de r\u00e9plique en lecture et visualisons le r\u00e9sultat pour nos clients.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"CQRS-y-su-fuente-de-eventos\"><\/span>CQRS et sa source d&#039;\u00e9v\u00e9nements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>J&#039;ai vu \u00e0 plusieurs reprises que les gens confondent ces deux concepts. Les deux sont largement utilis\u00e9s dans les infrastructures \u00e9v\u00e9nementielles ainsi que dans les micro-services \u00e9v\u00e9nementiels, mais ils ont des significations tr\u00e8s diff\u00e9rentes.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Base-de-datos-de-informes-%E2%80%93-Denormalizer\"><\/span>Base de donn\u00e9es de rapports - Denormalizer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Dans certains syst\u00e8mes \u00e9v\u00e9nementiels, le CQRS est impl\u00e9ment\u00e9 de sorte que le syst\u00e8me contienne une ou plusieurs bases de donn\u00e9es de rapports.<\/p>\n<p>Une base de donn\u00e9es de rapports est un stockage en lecture seule compl\u00e8tement diff\u00e9rent qui mod\u00e9lise et pr\u00e9serve les donn\u00e9es dans le meilleur format pour les repr\u00e9senter. Vous pouvez le stocker dans un format non standard pour l&#039;optimiser en fonction des besoins des clients. Dans certains cas, la base de donn\u00e9es de rapports contient uniquement des donn\u00e9es d\u00e9riv\u00e9es, m\u00eame \u00e0 partir de plusieurs sources de donn\u00e9es.<\/p>\n<p>Dans une architecture de microservices, nous appelons un service Denormalizer s&#039;il \u00e9coute certains \u00e9v\u00e9nements et maintient une base de donn\u00e9es de rapports bas\u00e9s sur eux. Le client lit la base de donn\u00e9es de rapports \u00e0 partir du service d\u00e9normalis\u00e9.<\/p>\n<p>Un exemple pourrait \u00eatre que le service de profil utilisateur \u00e9met un \u00e9v\u00e9nement <code>user.edit<\/code> avec des informations utiles <code>{id: 1, nom: &#039;Mary Anne&#039;, statut: &#039;churn&#039;}<\/code>, Le service Denormalizer l&#039;\u00e9coute, mais ne le stocke que dans sa base de donn\u00e9es de rapports <code>{nom: &#039;Mary Anne&#039;}<\/code>, car le client n&#039;est pas int\u00e9ress\u00e9 par l&#039;\u00e9tat de d\u00e9sabonnement interne de l&#039;utilisateur.<\/p>\n<p>Il peut \u00eatre difficile de synchroniser une base de donn\u00e9es de rapports. Habituellement, nous ne pouvons viser qu&#039;une coh\u00e9rence \u00e9ventuelle.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Outro\"><\/span>Autre<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>CQRS est un mod\u00e8le architectural puissant pour s\u00e9parer les op\u00e9rations de lecture et d&#039;\u00e9criture et leurs interfaces, mais il ajoute \u00e9galement une complexit\u00e9 suppl\u00e9mentaire \u00e0 votre syst\u00e8me. Dans la plupart des cas, vous ne devez pas utiliser CQRS pour l&#039;ensemble du syst\u00e8me, uniquement pour des parties sp\u00e9cifiques o\u00f9 la complexit\u00e9 et l&#039;\u00e9volutivit\u00e9 le rendent n\u00e9cessaire.<\/p>\n<p>Pour en savoir plus sur le CQRS et les bases de donn\u00e9es de rapports, je vous recommande de consulter les ressources suivantes:<\/p>\n<ul>\n<li>CQRS - Martin Fowler<\/li>\n<li>CQRS - MSDN<\/li>\n<li>CQRS, interface utilisateur bas\u00e9e sur les t\u00e2ches, source d&#039;\u00e9v\u00e9nement \u00e0 nouveau! - Greg Young<\/li>\n<li>CQRS et Event Source - Code on the Beach 2014 - Greg Young<\/li>\n<li>Base de donn\u00e9es des rapports - Martin Fowler<\/li>\n<\/ul>\n<p>F\u00e9licitations pour avoir termin\u00e9 cette le\u00e7on!<\/p>\n<\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>CQRS es una herramienta muy buena a la hora de programar. Es realmente una ayuda y puede llegar a facilitarte muchas cosas, sigue leyendo y aprende todo sobre CQRS. \u00bfQu\u00e9&#8230;<\/p>","protected":false},"author":1,"featured_media":95746,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1374],"tags":[],"class_list":["post-95745","post","type-post","status-publish","format-standard","has-post-thumbnail","category-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Explicando todo acerca de CQRS - R Marketing Digital<\/title>\n<meta name=\"description\" content=\"CQRS es una herramienta muy buena a la hora de programar. 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