{"id":3427,"date":"2022-12-07T10:33:06","date_gmt":"2022-12-07T10:33:06","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/learn-more-about-ruby-on-rails-with-pub-sub\/"},"modified":"2026-03-09T13:04:35","modified_gmt":"2026-03-09T13:04:35","slug":"saiba-mais-sobre-ruby-on-rails-com-pub-sub","status":"publish","type":"post","link":"https:\/\/thecodest.co\/pt\/blog\/learn-more-about-ruby-on-rails-with-pub-sub\/","title":{"rendered":"Saiba mais sobre o Ruby on Rails com Pub\/Sub"},"content":{"rendered":"<p><strong><a href=\"https:\/\/thecodest.co\/pt\/case-studies\/providing-a-team-of-ruby-developers-for-a-fintech-company\/\">Rubi<\/a> sobre <a href=\"https:\/\/thecodest.co\/pt\/blog\/ways-to-increase-your-rails-performance\/\">Carris<\/a><\/strong> (Rails, <a href=\"https:\/\/thecodest.co\/pt\/blog\/hire-ror-developer\/\">RoR<\/a>) \u00e9 um conhecido <a href=\"https:\/\/thecodest.co\/pt\/blog\/find-your-ideal-stack-for-web-development\/\">web<\/a> estrutura de aplica\u00e7\u00e3o escrita em <strong>Rubi<\/strong> linguagem de programa\u00e7\u00e3o. <strong>Pub\/Sub<\/strong> \u00e9 uma designa\u00e7\u00e3o abreviada dos padr\u00f5es de conce\u00e7\u00e3o de software denominados <b>Publicar-subscrever<\/b>. Vou explicar como a comunica\u00e7\u00e3o entre componentes de software no Rails pode ser tratada pelo Pub\/Sub.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">O que \u00e9 o Pub\/sub?<\/h2>\n\n\n\n<p><strong>Pub\/sub<\/strong> \u00e9 um padr\u00e3o de conce\u00e7\u00e3o de software que permite a comunica\u00e7\u00e3o servi\u00e7o-a-servi\u00e7o. Servi\u00e7o<br>implica um dos dois pap\u00e9is: editor (que produz) ou recetor (que consome). O que \u00e9<br>produzido para ser consumido \u00e9 determinado como um evento ou uma mensagem ou uma notifica\u00e7\u00e3o. No<br>No contexto do presente artigo, s\u00e3o utilizados indistintamente para designar a mesma coisa.<br>O servi\u00e7o que produz n\u00e3o sabe quem consome. O servi\u00e7o que consome n\u00e3o<br>conhecem a origem da mensagem. Podem permanecer desconhecidos um para o outro. \u00c9 diferente de<br>filas de mensagens, em que o componente que envia a mensagem conhece frequentemente o seu destino<br>- este estilo de envio de mensagens permite-lhe enviar mensagens para qualquer lugar. Este mecanismo \u00e9 um dos principais<br>de <strong>Pub\/sub<\/strong> e isso significa que est\u00e3o dissociados.<\/p>\n\n\n\n<p>Para exprimirem os seus interesses m\u00fatuos, devem partilhar um entendimento comum. Por conseguinte,<br>ambos os pap\u00e9is t\u00eam um mecanismo impl\u00edcito de \"stick\" em que o produtor de uma mensagem e o<br>consumidor da mensagem. Este mecanismo \u00e9 designado por assunto, subscri\u00e7\u00e3o ou t\u00f3pico. \u00c9<br>respons\u00e1vel pela categoriza\u00e7\u00e3o de mensagens para assuntos, \u00e9 essencialmente um filtro de mensagens sem estado.<br>Os t\u00f3picos funcionam como esta\u00e7\u00f5es de transmiss\u00e3o. Um editor produz a mensagem para o t\u00f3pico,<br>os subscritores recebem imediatamente a mensagem do t\u00f3pico. Devido ao facto de os<br>a forma mais eficiente de trocar mensagens \u00e9 trat\u00e1-las de forma ass\u00edncrona.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rails sem Pub\/Sub<\/h2>\n\n\n\n<p>Por padr\u00e3o, n\u00e3o h\u00e1 sobrecarga do Rails para padr\u00f5es de design de software para passar mensagens entre componentes. Os desenvolvedores usam o padr\u00e3o <strong>programa\u00e7\u00e3o orientada para os objectos<\/strong> (<a href=\"https:\/\/thecodest.co\/pt\/dictionary\/object-oriented-programming-oop\/\">OOP<\/a>): passar par\u00e2metros a fun\u00e7\u00f5es, pedir classes sobre valores.<\/p>\n\n\n\n<p>Quando a aplica\u00e7\u00e3o \u00e9 bastante simples, pode ser suficiente. Quando a aplica\u00e7\u00e3o cresce, por exemplo, algumas opera\u00e7\u00f5es precisam de ser efectuadas de forma ass\u00edncrona, ent\u00e3o o <a href=\"https:\/\/thecodest.co\/pt\/dictionary\/why-do-projects-fail\/\">projeto<\/a> precisa de uma abstra\u00e7\u00e3o que resolva que <a href=\"https:\/\/thecodest.co\/pt\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">dados<\/a> fluxo de trabalho. Em vez de reinventar a roda, os programadores podem implementar <strong>Pub\/sub<\/strong> para colmatar esta falta de abstra\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pr\u00f3s do Pub\/Sub com Rails<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Evitar as chamadas de retorno de registos activos.<\/li>\n\n\n\n<li>Ao adicionar o processamento paralelo ass\u00edncrono a um sistema, o desempenho, a fiabilidade e a <a href=\"https:\/\/thecodest.co\/pt\/blog\/difference-between-elasticity-and-scalability-in-cloud-computing\/\">escalabilidade<\/a> s\u00e3o melhorados.<\/li>\n\n\n\n<li>As mensagens podem ser transmitidas de forma ass\u00edncrona para diferentes partes do sistema.<\/li>\n\n\n\n<li>Permite que as mensagens sejam transmitidas de forma ass\u00edncrona para diferentes partes de um sistema.<\/li>\n\n\n\n<li>Desacoplamento - adicionar ou alterar uma funcionalidade n\u00e3o ter\u00e1 impacto em nada porque Pub\/Sub<br>permite-lhe modificar a forma como tudo interage.<\/li>\n\n\n\n<li>O consumidor de mensagens deixar\u00e1 de precisar de verificar periodicamente se existem actualiza\u00e7\u00f5es ou novas<br>informa\u00e7\u00f5es. Reduz a lat\u00eancia de entrega que pode ser particularmente problem\u00e1tica em sistemas<br>sem toler\u00e2ncia para atrasos.<\/li>\n\n\n\n<li>N\u00e3o h\u00e1 limite para o n\u00famero de subscritores que o sistema pode suportar, porque este pode mudar,<br>atualizar, multiplicar ou desaparecer em qualquer altura.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Contras do Pub\/Sub com Rails<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A principal desvantagem dos sistemas Pub\/sub \u00e9 a dissocia\u00e7\u00e3o entre o editor e o<br>assinante.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Introdu\u00e7\u00e3o do Rails Pub\/Sub<\/h2>\n\n\n\n<p>Exemplos de c\u00f3digo fonte em Rails foram escritos usando a biblioteca<br><a href=\"https:\/\/github.com\/stevo\/pubsub_on_rails\" rel=\"nofollow\">Pub\/Sub em Rails<\/a> (na nomenclatura do Ruby, uma biblioteca chama-se gem): Encontrar\u00e1 mais pormenores no readme da gem. A implementa\u00e7\u00e3o \u00e9 composta por m\u00f3dulos:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Dom\u00ednio,<\/li>\n\n\n\n<li>Evento,<\/li>\n\n\n\n<li>Manipulador de eventos,<\/li>\n\n\n\n<li>Editor do evento,<\/li>\n\n\n\n<li>Assinatura.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Dom\u00ednio<\/h3>\n\n\n\n<p>Descreve a l\u00f3gica comercial, a fim de fornecer contexto para Pub\/Sub e, por conseguinte, tornar mais clara a sua utiliza\u00e7\u00e3o. <a href=\"https:\/\/thecodest.co\/pt\/dictionary\/what-is-code-refactoring\/\">c\u00f3digo<\/a>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\"> m\u00f3dulo Notifications\n   extend PubSub::Dom\u00ednio\n fim<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\"> m\u00f3dulo Relat\u00f3rios\n   estender PubSub::Dom\u00ednio\n fim\n\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Evento<\/h3>\n\n\n\n<p>Trata-se de uma classe que descreve o que aconteceu. Declare o nome da classe como auto-descritor do que aconteceu, por exemplo: cancelado, alterado, criado, destru\u00eddo, enviado, atualizado. Os nomes dos eventos podem ser semelhantes a: ProfitAndLossStatementCreatedEvent, que significa que uma demonstra\u00e7\u00e3o financeira foi criada.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\"> classe Reports::ProfitAndLossStatementCreatedEvent &lt; PubSub::DomainEvent\n   atributo :profit_and_loss_statement_id, Types::Strict::Integer\n fim<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Editor de eventos<\/h3>\n\n\n\n<p>Classe capaz de emitir eventos. O exemplo mostra a cria\u00e7\u00e3o de um relat\u00f3rio de servi\u00e7o. Quando o relat\u00f3rio for criado com sucesso, emite o evento de cria\u00e7\u00e3o desse relat\u00f3rio.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\">classe Reports::ProfitAndLossStatementService\n   include PubSub::Emit\n    def execute\n     emit(:report_profit_and_loss_statement_created, profit_and_loss_statement_id: id) if result.ok?\n   end\n fim<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Manipulador de eventos<\/h3>\n\n\n\n<p>Esta classe deve ser executada em resposta ao tratamento de um evento.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\">m\u00f3dulo Notifica\u00e7\u00f5es\n class ReportsProfitAndLossStatementCreatedHandler &lt; PubSub::DomainEventHandler\n   def call\n     ReportMailer.profit_and_loss_statement(profit_and_loss_statement).deliver_now\n   fim\n\n   privado\n\n   def profit_and_loss_statement\n     ProfitAndLossStatement.find(event_data.profit_and_loss_statement_id)\n   end\n end\nend<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Assinatura<\/h3>\n\n\n\n<p>Os eventos s\u00e3o ligados aos seus manipuladores atrav\u00e9s de subscri\u00e7\u00f5es.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"yaml\" class=\"language-yaml\">notifica\u00e7\u00f5es:\n reports__profit_and_loss_statement_created: async<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Exemplos de casos de utiliza\u00e7\u00e3o:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Funcionalidade \"Seguir\" nas redes sociais,<\/li>\n\n\n\n<li>Internet das coisas,<\/li>\n\n\n\n<li>Correio eletr\u00f3nico,<\/li>\n\n\n\n<li>Notifica\u00e7\u00e3o sobre ficheiros gerados.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Padr\u00f5es semelhantes<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><b>EventBus<\/b> - os componentes podem enviar eventos para o EventBus sem saber quem os ir\u00e1 recolher ou quantos inquiridos ir\u00e3o <a href=\"https:\/\/thecodest.co\/pt\/blog\/react-development-all-you-have-to-know\/\">reagir<\/a>,<\/li>\n\n\n\n<li><b>Observador<\/b> - o sujeito mant\u00e9m uma lista de dependentes, chamados observadores, e notifica-os sempre que o seu estado se altera,<\/li>\n\n\n\n<li><b>Agrupamento<\/b> - quando os clientes fazem polling, perguntam periodicamente ao sistema se existem novos eventos ou dados.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Gemas<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<p><a href=\"https:\/\/github.com\/edisonywh\/rocketman\" rel=\"nofollow\">https:\/\/github.com\/edisonywh\/rocketman<\/a><\/p>\n<\/li>\n\n\n\n<li>\n<p><a href=\"https:\/\/github.com\/krisleech\/wisper\" rel=\"nofollow\">https:\/\/github.com\/krisleech\/wisper<\/a><\/p>\n<\/li>\n\n\n\n<li>\n<p><a href=\"https:\/\/github.com\/stevo\/pubsub_on_rails\" rel=\"nofollow\">https:\/\/github.com\/stevo\/pubsub<em>sobre<\/em>carris<\/a><\/p>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Resumo<\/h2>\n\n\n\n<p>Pub\/sub n\u00e3o \u00e9 uma abordagem comum em Ruby in Rails. Como introduzido no artigo, este padr\u00e3o pode trazer muitos benef\u00edcios para o projeto - pode tornar o c\u00f3digo limpo, desacoplar servi\u00e7os e torn\u00e1-los facilmente escal\u00e1veis.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/thecodest.co\/contact\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/interested_in_cooperation_.png\" alt=\"faixa de coopera\u00e7\u00e3o\"\/><\/a><\/figure>","protected":false},"excerpt":{"rendered":"<p>O Pub\/Sub pode trazer muitos benef\u00edcios para o projeto - pode tornar o c\u00f3digo limpo, dissociar servi\u00e7os e torn\u00e1-los facilmente escal\u00e1veis. Saiba mais sobre o Pub\/Sub no artigo seguinte e eleve o n\u00edvel do seu projeto!<\/p>","protected":false},"author":2,"featured_media":3428,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[12],"class_list":["post-3427","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development","tag-it"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Learn More about Ruby on Rails with Pub\/Sub - The Codest<\/title>\n<meta name=\"description\" content=\"Explore the Pub\/Sub design pattern in Ruby on Rails and see how it enables event-driven communication and scalable system architecture.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/pt\/blogue\/saiba-mais-sobre-ruby-on-rails-com-pub-sub\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learn More about Ruby on Rails with Pub\/Sub\" \/>\n<meta property=\"og:description\" content=\"Explore the Pub\/Sub design pattern in Ruby on Rails and see how it enables event-driven communication and scalable system architecture.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thecodest.co\/pt\/blogue\/saiba-mais-sobre-ruby-on-rails-com-pub-sub\/\" \/>\n<meta property=\"og:site_name\" content=\"The Codest\" \/>\n<meta property=\"article:published_time\" content=\"2022-12-07T10:33:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-09T13:04:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thecodest.co\/app\/uploads\/2024\/05\/ruby_on_rails_with_pubsub.png\" \/>\n\t<meta property=\"og:image:width\" content=\"960\" \/>\n\t<meta property=\"og:image:height\" content=\"540\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"thecodest\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"thecodest\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/learn-more-about-ruby-on-rails-with-pub-sub\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/learn-more-about-ruby-on-rails-with-pub-sub\\\/\"},\"author\":{\"name\":\"thecodest\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/#\\\/schema\\\/person\\\/7e3fe41dfa4f4e41a7baad4c6e0d4f76\"},\"headline\":\"Learn More about Ruby on Rails with Pub\\\/Sub\",\"datePublished\":\"2022-12-07T10:33:06+00:00\",\"dateModified\":\"2026-03-09T13:04:35+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/learn-more-about-ruby-on-rails-with-pub-sub\\\/\"},\"wordCount\":778,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/learn-more-about-ruby-on-rails-with-pub-sub\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/thecodest.co\\\/app\\\/uploads\\\/2024\\\/05\\\/ruby_on_rails_with_pubsub.png\",\"keywords\":[\"IT\"],\"articleSection\":[\"Software Development\"],\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/thecodest.co\\\/blog\\\/learn-more-about-ruby-on-rails-with-pub-sub\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/learn-more-about-ruby-on-rails-with-pub-sub\\\/\",\"url\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/learn-more-about-ruby-on-rails-with-pub-sub\\\/\",\"name\":\"Learn More about Ruby on Rails with Pub\\\/Sub - 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