{"id":2042,"date":"2019-06-01T13:05:16","date_gmt":"2019-06-01T10:05:16","guid":{"rendered":"http:\/\/demensdeum.com\/blog\/?p=2042"},"modified":"2024-12-16T22:32:37","modified_gmt":"2024-12-16T19:32:37","slug":"bridge-pattern","status":"publish","type":"post","link":"https:\/\/demensdeum.com\/blog\/pt\/2019\/06\/01\/bridge-pattern\/","title":{"rendered":"Ponte Padr\u00e3o"},"content":{"rendered":"<p>O padr\u00e3o Bridge refere-se a padr\u00f5es de projeto estrutural. Ele permite abstrair a implementa\u00e7\u00e3o da l\u00f3gica de classe movendo a l\u00f3gica para uma classe abstrata separada. Parece simples, certo?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2053\" src=\"https:\/\/demensdeum.com\/blog\/wp-content\/uploads\/2019\/06\/bridge.jpg\" alt=\"\" width=\"380\" height=\"323\" \/><\/p>\n<p>Suponha que implementemos um bot de spam que seja capaz de enviar mensagens para diferentes tipos de mensageiros.<br \/>N\u00f3s o implementamos usando um protocolo comum:<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-unknown\" data-lang=\"unknown\"><code>protocol User {\n    let token: String\n    let username: String\n}\n\nprotocol Messenger {\n    var authorize(login: String, password: String)\n    var send(message: String, to user: User)\n}\n\nclass iSeekUUser: User {\n    let token: String\n    let username: String\n}\n\nclass iSeekU: Messenger {\n\n    var authorizedUser: User?\n    var requestSender: RequestSender?\n    var requestFactory: RequestFactory?\n\n    func authorize(login: String, password: String) {\n        authorizedUser = requestSender?.perform(requestFactory.loginRequest(login: login, password: password))\n    }\n    \n    func send(message: String, to user: User) {\n        requestSender?.perform(requestFactory.messageRequest(message: message, to: user)\n    }\n}\n\nclass SpamBot {\n    func start(usersList: [User]) {\n        let iSeekUMessenger = iSeekU()\n        iSeekUMessenger.authorize(login: \"SpamBot\", password: \"SpamPassword\")\n        \n        for user in usersList {\n            iSeekUMessennger.send(message: \"Hey checkout demensdeum blog! http:\/\/demensdeum.com\", to: user)\n        }\n    }\n}\n<\/code><\/pre>\n<\/div>\n<p>Agora vamos imaginar o lan\u00e7amento de um protocolo novo e mais r\u00e1pido para envio de mensagens para o mensageiro iSekU. Para adicionar um novo protocolo, voc\u00ea precisar\u00e1 duplicar a implementa\u00e7\u00e3o do bot iSekU, alterando apenas uma pequena parte dele. N\u00e3o est\u00e1 claro por que fazer isso se apenas uma pequena parte da l\u00f3gica da classe mudou. Com esta abordagem, o princ\u00edpio DRY \u00e9 violado; com o desenvolvimento do produto, a falta de flexibilidade se far\u00e1 sentir atrav\u00e9s de erros e atrasos na implementa\u00e7\u00e3o de novos recursos.<br \/>Vamos mover a l\u00f3gica do protocolo para uma classe abstrata, implementando assim o padr\u00e3o Bridge:<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-unknown\" data-lang=\"unknown\"><code>protocol User {\n    let token: String\n    let username: String\n}\n\nprotocol Messenger {\n    var authorize(login: String, password: String)\n    var send(message: String, to user: User)\n}\n\nprotocol MessagesSender {\n    func send(message: String, to user: User)\n}\n\nclass iSeekUUser: User {\n    let token: String\n    let username: String\n}\n\nclass iSeekUFastMessengerSender: MessagesSender {\n    func send(message: String, to user: User) {\n        requestSender?.perform(requestFactory.messageRequest(message: message, to: user)\n    }\n}\n\nclass iSeekU: Messenger {\n\n    var authorizedUser: User?\n    var requestSender: RequestSender?\n    var requestFactory: RequestFactory?\n    var messagesSender: MessengerMessagesSender?\n\n    func authorize(login: String, password: String) {\n        authorizedUser = requestSender?.perform(requestFactory.loginRequest(login: login, password: password))\n    }\n    \n    func send(message: String, to user: User) {\n        messagesSender?.send(message: message, to: user)\n    }\n}\n\nclass SpamBot {\n\n    var messagesSender: MessagesSender?\n\n    func start(usersList: [User]) {\n        let iSeekUMessenger = iSeekU()\n        iSeekUMessenger.authorize(login: \"SpamBot\", password: \"SpamPassword\")\n        \n        for user in usersList {\n            messagesSender.send(message: \"Hey checkout demensdeum blog! http:\/\/demensdeum.com\", to: user)\n        }\n    }\n}\n<\/code><\/pre>\n<\/div>\n<p>Uma das vantagens desta abordagem \u00e9, sem d\u00favida, a capacidade de expandir a funcionalidade da aplica\u00e7\u00e3o escrevendo plugins\/bibliotecas que implementam l\u00f3gica abstra\u00edda sem alterar o c\u00f3digo da aplica\u00e7\u00e3o principal.<br \/>Qual \u00e9 a diferen\u00e7a com o padr\u00e3o Estrat\u00e9gia? Ambos os padr\u00f5es s\u00e3o muito semelhantes, no entanto, Estrat\u00e9gia descreve *algoritmos* de comuta\u00e7\u00e3o, enquanto Bridge permite alternar grandes partes de *qualquer l\u00f3gica complexa*.<\/p>\n<h3>Fontes<\/h3>\n<p><a href=\"https:\/\/refactoring.guru\/ru\/design-patterns\/bridge\" target=\"_blank\" rel=\"noopener\">https:\/\/refactoring.guru\/ru\/design-patterns\/bridge <\/a><\/p>\n<h3>C\u00f3digo fonte<\/h3>\n<p><a href=\"https:\/\/gitlab.com\/demensdeum\/patterns\/\" target=\"_blank\" rel=\"noopener\">https:\/\/gitlab.com\/demensdeum\/patterns\/<\/a><\/ a>p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O padr\u00e3o Bridge refere-se a padr\u00f5es de projeto estrutural. Ele permite abstrair a implementa\u00e7\u00e3o da l\u00f3gica de classe movendo a l\u00f3gica para uma classe abstrata separada. Parece simples, certo? Suponha que implementemos um bot de spam que seja capaz de enviar mensagens para diferentes tipos de mensageiros.N\u00f3s o implementamos usando um protocolo comum: protocol User<a class=\"more-link\" href=\"https:\/\/demensdeum.com\/blog\/pt\/2019\/06\/01\/bridge-pattern\/\">Continue reading <span class=\"screen-reader-text\">&#8220;Ponte Padr\u00e3o&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[61,52],"tags":[106,95],"class_list":["post-2042","post","type-post","status-publish","format-standard","hentry","category-techie","category-tutorials","tag-bridge","tag-patterns","entry"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"pt","enabled_languages":["en","ru","zh","de","fr","ja","pt","hi"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"ru":{"title":true,"content":true,"excerpt":false},"zh":{"title":true,"content":true,"excerpt":false},"de":{"title":true,"content":true,"excerpt":false},"fr":{"title":true,"content":true,"excerpt":false},"ja":{"title":true,"content":true,"excerpt":false},"pt":{"title":true,"content":true,"excerpt":false},"hi":{"title":false,"content":false,"excerpt":false}}},"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/posts\/2042","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/comments?post=2042"}],"version-history":[{"count":12,"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/posts\/2042\/revisions"}],"predecessor-version":[{"id":3955,"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/posts\/2042\/revisions\/3955"}],"wp:attachment":[{"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/media?parent=2042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/categories?post=2042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/demensdeum.com\/blog\/pt\/wp-json\/wp\/v2\/tags?post=2042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}