{"id":1120,"date":"2024-09-28T09:04:23","date_gmt":"2024-09-28T12:04:23","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=1120"},"modified":"2024-09-28T09:04:23","modified_gmt":"2024-09-28T12:04:23","slug":"delegate-design-pattern","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/delegate-design-pattern\/","title":{"rendered":"Delegate Design Pattern"},"content":{"rendered":"\n<p>O padr\u00e3o de design Delegate (ou Delegate Pattern) \u00e9 um padr\u00e3o de design de software que permite a um objeto delegar a responsabilidade de um determinado processo para outro objeto. Ele \u00e9 comumente usado em situa\u00e7\u00f5es onde um objeto precisa executar uma fun\u00e7\u00e3o, mas n\u00e3o pode ou n\u00e3o quer execut\u00e1-la diretamente. Em vez disso, ele delega essa responsabilidade para um objeto especializado, conhecido como delegado.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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 of Contents<\/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=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/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-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/delegate-design-pattern\/#Como_funciona_o_Delegate_Pattern\" >Como funciona o Delegate Pattern:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/delegate-design-pattern\/#Exemplo_em_Java\" >Exemplo em Java:<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Como_funciona_o_Delegate_Pattern\"><\/span>Como funciona o Delegate Pattern:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Objeto Delegador (Delegator)<\/strong>: \u00c9 o objeto que cont\u00e9m uma refer\u00eancia para o objeto delegado. Ele possui um m\u00e9todo ou m\u00e9todos que precisam realizar uma opera\u00e7\u00e3o espec\u00edfica.<\/li>\n\n\n\n<li><strong>Objeto Delegado (Delegate)<\/strong>: \u00c9 o objeto que realiza a opera\u00e7\u00e3o delegada. Ele cont\u00e9m a implementa\u00e7\u00e3o real da fun\u00e7\u00e3o que o objeto delegador deseja executar.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Exemplo_em_Java\"><\/span>Exemplo em Java:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Vamos imaginar um cen\u00e1rio onde temos um objeto <code>VideoPlayer<\/code> que precisa reproduzir v\u00eddeos de diferentes formatos. Em vez de implementar a l\u00f3gica de reprodu\u00e7\u00e3o diretamente no <code>VideoPlayer<\/code>, podemos usar o Delegate Pattern para delegar a reprodu\u00e7\u00e3o para um objeto especializado, como <code>AviPlayer<\/code>, <code>Mp4Player<\/code>, etc., dependendo do formato do v\u00eddeo.<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >\/\/ Interface que define o comportamento do player de v\u00eddeo\ninterface VideoPlayer {\n    void play(String videoFile);\n}\n\n\/\/ Implementa\u00e7\u00e3o do player de v\u00eddeo para arquivos AVI\nclass AviPlayer implements VideoPlayer {\n    @Override\n    public void play(String videoFile) {\n        System.out.println(\"Reproduzindo arquivo AVI: \" + videoFile);\n        \/\/ L\u00f3gica espec\u00edfica para reproduzir arquivos AVI\n    }\n}\n\n\/\/ Implementa\u00e7\u00e3o do player de v\u00eddeo para arquivos MP4\nclass Mp4Player implements VideoPlayer {\n    @Override\n    public void play(String videoFile) {\n        System.out.println(\"Reproduzindo arquivo MP4: \" + videoFile);\n        \/\/ L\u00f3gica espec\u00edfica para reproduzir arquivos MP4\n    }\n}\n\n\/\/ Classe que utiliza o Delegate Pattern para reproduzir v\u00eddeos\nclass VideoPlayerClient {\n    private VideoPlayer videoPlayer;\n\n    public VideoPlayerClient(VideoPlayer player) {\n        this.videoPlayer = player;\n    }\n\n    public void playVideo(String videoFile) {\n        videoPlayer.play(videoFile);\n    }\n}\n\n\/\/ Exemplo de uso\npublic class Main {\n    public static void main(String[] args) {\n        \/\/ Criando um cliente de player de v\u00eddeo para AVI\n        VideoPlayerClient client1 = new VideoPlayerClient(new AviPlayer());\n        client1.playVideo(\"video.avi\");\n\n        \/\/ Criando um cliente de player de v\u00eddeo para MP4\n        VideoPlayerClient client2 = new VideoPlayerClient(new Mp4Player());\n        client2.playVideo(\"video.mp4\");\n    }\n}\n<\/pre><\/div>\n\n\n\n<p>Neste exemplo:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>VideoPlayer<\/code> \u00e9 a interface que define o m\u00e9todo <code>play<\/code> para reproduzir v\u00eddeos.<\/li>\n\n\n\n<li><code>AviPlayer<\/code> e <code>Mp4Player<\/code> s\u00e3o implementa\u00e7\u00f5es concretas de <code>VideoPlayer<\/code>, cada um com sua pr\u00f3pria implementa\u00e7\u00e3o de como reproduzir v\u00eddeos de seus formatos espec\u00edficos.<\/li>\n\n\n\n<li><code>VideoPlayerClient<\/code> \u00e9 o objeto delegador que cont\u00e9m uma refer\u00eancia a um objeto <code>VideoPlayer<\/code> e delega a responsabilidade de reprodu\u00e7\u00e3o para ele.<\/li>\n<\/ul>\n\n\n\n<p>O Delegate Pattern ajuda a separar preocupa\u00e7\u00f5es e promove um design mais flex\u00edvel e extens\u00edvel, onde novas implementa\u00e7\u00f5es de reprodu\u00e7\u00e3o de v\u00eddeo podem ser adicionadas sem modificar diretamente o cliente (objeto delegador).<\/p>\n\n\n\n<figure class=\"wp-block-embed aligncenter is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"video_embed clearfix\"><div class=\"video_embed clearfix\"><iframe loading=\"lazy\" title=\"DELEGATION PATTERN JAVA: VANTAGENS, PORQUE USAR E COMO FAZER\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/KtZlDhC_ycs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div><\/div>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>O padr\u00e3o de design Delegate (ou Delegate Pattern) \u00e9 um padr\u00e3o de design de software que permite a um objeto delegar a responsabilidade de um determinado processo para outro objeto. Ele \u00e9 comumente usado em situa\u00e7\u00f5es onde um objeto precisa executar uma fun\u00e7\u00e3o, mas n\u00e3o pode ou n\u00e3o quer execut\u00e1-la diretamente. Em vez disso, ele [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1121,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[151],"class_list":["post-1120","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-designpatterns","tag-delegation-pattern"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.5 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Delegate Design Pattern - Viciados em Aprender<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/delegate-design-pattern\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Delegate Design Pattern\" \/>\n<meta property=\"og:description\" content=\"O padr\u00e3o de design Delegate (ou Delegate Pattern) \u00e9 um padr\u00e3o de design de software que permite a um objeto delegar a responsabilidade de um determinado processo para outro objeto. 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