{"id":3988,"date":"2017-09-06T12:46:33","date_gmt":"2017-09-06T19:46:33","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=3988"},"modified":"2025-06-13T19:40:27","modified_gmt":"2025-06-14T02:40:27","slug":"distributed-caching-aspnet-couchbase","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/distributed-caching-aspnet-couchbase\/","title":{"rendered":"Armazenamento em cache distribu\u00eddo com ASP.NET Core e Couchbase"},"content":{"rendered":"
\n

O armazenamento em cache distribu\u00eddo pode ajudar a melhorar o desempenho de um aplicativo ASP.NET Core. Isso \u00e9 especialmente verdadeiro para um aplicativo ASP.NET que \u00e9 implantado em um farm de servidores ou em um ambiente de nuvem escal\u00e1vel. Usar o Couchbase Server para armazenamento em cache \u00e9 um dos muitos recursos que o tornam a escolha ideal para seu aplicativo ASP.NET Core. necessidades do banco de dados de engajamento<\/a>.<\/p>\n<\/div>\n

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Nesta postagem do blog, mostrarei a voc\u00ea como usar o Plug-in do middleware Couchbase.Extensions.Caching<\/a> para adicionar facilmente recursos de cache distribu\u00eddo ao seu aplicativo.<\/p>\n<\/div>\n

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Voc\u00ea pode acompanhar o c\u00f3digo de amostra que escrevi para esta postagem no GitHub<\/a>.<\/p>\n<\/div>\n

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Observe que o Couchbase.Extensions.Caching est\u00e1 atualmente em uma vers\u00e3o beta2 (no momento em que escrevo esta postagem do blog), portanto, algumas coisas podem mudar.<\/em><\/p>\n<\/div>\n

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Configura\u00e7\u00e3o b\u00e1sica do Couchbase<\/h2>\n
\n
\n

Primeiro, voc\u00ea precisar\u00e1 de um cluster do Couchbase Server em execu\u00e7\u00e3o (voc\u00ea pode instal\u00e1-lo no local<\/a>ou com o Docker<\/a>ou mesmo no Azure<\/a> se voc\u00ea quiser).<\/p>\n<\/div>\n

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Em seguida, voc\u00ea precisar\u00e1 criar um balde<\/a> no Couchbase onde os dados armazenados em cache ser\u00e3o armazenados. Chamei o meu de \"cachebucket\". Talvez voc\u00ea queira aproveitar as vantagens do novo recurso de balde ef\u00eamero<\/a> no Couchbase Server 5.0 para armazenamento em cache, mas n\u00e3o \u00e9 necess\u00e1rio.<\/p>\n<\/div>\n

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Se voc\u00ea estiver usando o Couchbase Server 5.0, tamb\u00e9m precisar\u00e1 criar um usu\u00e1rio com permiss\u00f5es (Data Writer e Data Reader) nesse bucket. Para manter as coisas simples, crie um usu\u00e1rio com o mesmo nome do bucket (por exemplo, \"cachebucket\").<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Cache distribu\u00eddo com o Couchbase.Extensions<\/h2>\n
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O Couchbase.Extensions (GitHub)<\/a> tem como objetivo tornar mais simples o trabalho com o Couchbase Server e o .NET Core. O armazenamento em cache \u00e9 apenas uma dessas extens\u00f5es.<\/p>\n<\/div>\n

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Voc\u00ea pode adicion\u00e1-lo ao seu projeto ASP.NET Core com o NuGet, por meio do Package Manager: Instalar o pacote Couchbase.Extensions.Caching -Vers\u00e3o 1.0.0-beta2<\/code>ou com a interface do usu\u00e1rio do NuGet, ou voc\u00ea pode usar a linha de comando do .NET: dotnet add pacote Couchbase.Extensions.Caching --vers\u00e3o 1.0.0-beta2<\/code>.<\/p>\n<\/div>\n

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\"Couchbase<\/span><\/p>\n<\/div>\n

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Depois de adicionar isso ao seu projeto, voc\u00ea precisar\u00e1 fazer algumas pequenas altera\u00e7\u00f5es em seu Inicializa\u00e7\u00e3o<\/code> classe em Startup.cs<\/code>.<\/p>\n<\/div>\n

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Primeiro, em ConfigureServices<\/code>Adicione alguns namespaces:<\/p>\n<\/div>\n

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usando Couchbase.Extensions.Caching;\r\nusing Couchbase.Extensions.DependencyInjection;<\/code><\/pre>\n<\/div>\n<\/div>\n
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Isso tornar\u00e1 o namespace Caching dispon\u00edvel e, especificamente, o namespace AddDistributedCouchbaseCache<\/code> m\u00e9todo de extens\u00e3o para IServiceCollection<\/code>. Em seguida, chame esse m\u00e9todo de extens\u00e3o de dentro do ConfigureServices<\/code> m\u00e9todo.<\/p>\n<\/div>\n
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O outro espa\u00e7o de nome l\u00e1 dentro, Inje\u00e7\u00e3o de depend\u00eancia<\/code>\u00e9 necess\u00e1rio para injetar a funcionalidade do Couchbase. Nesse caso, ela ser\u00e1 usada somente pela extens\u00e3o Caching. Mas voc\u00ea tamb\u00e9m pode us\u00e1-la para outras finalidades, que abordarei em uma postagem futura no blog.<\/p>\n<\/div>\n
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Mas, por enquanto, ele s\u00f3 \u00e9 necess\u00e1rio para o AddCouchbase<\/code> m\u00e9todo de extens\u00e3o em IServiceCollection<\/code>.<\/p>\n<\/div>\n
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Por fim, junte os dois, e seu ConfigureServices<\/code> deve ter a seguinte apar\u00eancia:<\/p>\n<\/div>\n
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public void ConfigureServices(IServiceCollection services)\r\n{\r\n    services.AddMvc();\r\n\r\n    services.AddCouchbase(opt =>\r\n    {\r\n        opt.Servers = new List\r\n        {\r\n            new Uri(\"https:\/\/localhost:8091\")\r\n        };\r\n    });\r\n\r\n    services.AddDistributedCouchbaseCache(\"cachebucket\", \"password\", opt => { });\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Uso de cache distribu\u00eddo<\/h2>\n
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Agora que voc\u00ea tem uma configura\u00e7\u00e3o de cache distribu\u00eddo com o Couchbase em seu projeto ASP.NET Core, pode usar IDistributedCache<\/code> em outra parte do seu projeto.<\/p>\n<\/div>\n
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Inje\u00e7\u00e3o de IDistributedCache<\/h3>\n
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Um exemplo simples seria us\u00e1-lo diretamente em um controlador. Ele pode ser injetado em construtores conforme sua necessidade:<\/p>\n<\/div>\n
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classe p\u00fablica HomeController : Controlador\r\n{\r\n    private readonly IDistributedCache _cache;\r\n\r\n    public HomeController(IDistributedCache cache)\r\n    {\r\n        _cache = cache;\r\n    }\r\n\r\n    \/\/ ... snip ...\r\n\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n
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Cache de strings<\/h3>\n
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Voc\u00ea pode usar o GetString<\/code> e SetString<\/code> para recuperar\/definir um valor de string no cache.<\/p>\n<\/div>\n
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\/\/ cache\/recuperar do cache\r\n\/\/ uma string, armazenada sob a chave \"CachedString1\"\r\nvar message = _cache.GetString(\"CachedString1\");\r\nif (message == null)\r\n{\r\n    message = DateTime.Now + \" \" + Path.GetRandomFileName();\r\n    _cache.SetString(\"CachedString1\", message);\r\n}\r\nViewData[\"Message\"] = \"'CachedString1' is '\" + message + \"'\";<\/code><\/pre>\n<\/div>\n<\/div>\n
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Isso apareceria no bucket \"cachebucket\" como um valor bin\u00e1rio codificado (n\u00e3o JSON).<\/p>\n<\/div>\n
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\"String<\/span><\/p>\n<\/div>\n
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No c\u00f3digo de exemplo, eu simplesmente imprimo o ViewData[\"Message\"]<\/code> na visualiza\u00e7\u00e3o do Razor. A apar\u00eancia deve ser semelhante a esta:<\/p>\n<\/div>\n
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\"Cached<\/span><\/p>\n<\/div>\n<\/div>\n
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Objetos em cache<\/h3>\n
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Voc\u00ea tamb\u00e9m pode usar Set<\/code> e Obter<\/code> para salvar e recuperar objetos no cache. Criei um POCO (Plain Old CLR Object) muito simples para demonstrar:<\/p>\n<\/div>\n
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public class MyPoco\r\n{\r\n    public string Name { get; set; }\r\n    public int ShoeSize { get; set; }\r\n    public decimal Price { get; set; }\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n
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Em seguida, na amostra, eu gero uma string aleat\u00f3ria para usar como uma chave de cache e uma inst\u00e2ncia gerada aleatoriamente de MyPoco<\/code>. Primeiro, eu os armazeno no cache usando o Set<\/code> m\u00e9todo:<\/p>\n<\/div>\n
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var pocoKey = Path.GetRandomFileName();\r\n_cache.Set(pocoKey, MyPoco.Generate(), null);\r\nViewData[\"Message2\"] = \"Colocou em cache um POCO em '\" + pocoKey + \"'\";<\/code><\/pre>\n<\/div>\n<\/div>\n
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Em seguida, imprimo a chave para a visualiza\u00e7\u00e3o do Razor:<\/p>\n<\/div>\n
\n
\"Cached<\/span><\/p>\n<\/div>\n
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Em seguida, posso usar essa chave para procurar o valor no Couchbase:<\/p>\n<\/div>\n
\n
\"Cached<\/span><\/p>\n<\/div>\n
\n
Al\u00e9m disso, observe que ele foi serializado para JSON. Isso n\u00e3o significa apenas que voc\u00ea pode l\u00ea-lo, mas tamb\u00e9m pode consult\u00e1-lo com o N1QL (se necess\u00e1rio).<\/p>\n<\/div>\n<\/div>\n
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Cache distribu\u00eddo com expira\u00e7\u00e3o<\/h3>\n
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Se quiser que os valores no cache expirem ap\u00f3s um determinado per\u00edodo de tempo, voc\u00ea pode especificar isso com DistributedCacheEntryOptions<\/code> (somente SlidingExpiration<\/code> \u00e9 suportado no momento).<\/p>\n<\/div>\n
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\n
var anotherPocoKey = Path.GetRandomFileName();\r\n_cache.Set(anotherPocoKey, MyPoco.Generate(), new DistributedCacheEntryOptions\r\n{\r\n    SlidingExpiration = new TimeSpan(0, 0, 10) \/\/ 10 segundos\r\n});\r\nViewData[\"Message3\"] = \"Colocou em cache um POCO em '\" + anotherPocoKey + \"'\";<\/code><\/pre>\n<\/div>\n<\/div>\n
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No projeto de amostra, tamb\u00e9m configurei isso para ser impresso no Razor.<\/p>\n<\/div>\n
\n
\"Cached<\/span><\/p>\n<\/div>\n
\n
Se voc\u00ea visualizar esse documento (antes que os 10 segundos se esgotem) no Console do Couchbase, ver\u00e1 que ele tem um expira\u00e7\u00e3o<\/code> em seus metadados. Veja um exemplo:<\/p>\n<\/div>\n
\n
\n
{\r\n  \"id\": \"xjkmswko.v35\",\r\n  \"rev\": \"1-14e1d9998125000059b0404502000001\",\r\n  \"expiration\" (expira\u00e7\u00e3o): 1504723013,\r\n  \"flags\" (bandeiras): 33554433\r\n}<\/code><\/pre>\n<\/div>\n<\/div>\n
\n
Ap\u00f3s 10 segundos, esse documento desaparecer\u00e1 do compartimento e voc\u00ea ver\u00e1 um erro \"not found (Document does not exist)\" (n\u00e3o encontrado (o documento n\u00e3o existe)).<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Elimina\u00e7\u00e3o do cache distribu\u00eddo<\/h2>\n
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Por fim, n\u00e3o se esque\u00e7a de limpar os recursos usados pelo Couchbase .NET SDK para o armazenamento em cache distribu\u00eddo. Uma maneira f\u00e1cil de fazer isso \u00e9 com o comando ApplicationStopped<\/code> evento. Voc\u00ea pode conectar isso em Inicializa\u00e7\u00e3o<\/code>:<\/p>\n<\/div>\n
\n
\n
appLifetime.ApplicationStopped.Register(() =>\r\n{\r\n    app.ApplicationServices.GetRequiredService().Close();\r\n});<\/code><\/pre>\n<\/div>\n<\/div>\n
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Observe que voc\u00ea ter\u00e1 que adicionar IApplicationLifetime appLifetime<\/code> como um par\u00e2metro para o Configurar<\/code> m\u00e9todo em Inicializa\u00e7\u00e3o<\/code> se voc\u00ea ainda n\u00e3o o fez.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n
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Resumo<\/h2>\n
\n
\n
Usar o Couchbase Server para armazenamento em cache distribu\u00eddo em seu aplicativo ASP.NET Core \u00e9 uma \u00f3tima maneira de melhorar o desempenho e a escalabilidade do seu aplicativo. Esse tipo de caso de uso de \"engajamento\" \u00e9 o que o Couchbase Server faz de melhor. Para ver os clientes que est\u00e3o usando o Couchbase Server para armazenamento em cache, confira a p\u00e1gina Clientes do Couchbase<\/a> p\u00e1gina.<\/p>\n<\/div>\n
\n
Se voc\u00ea tiver perguntas ou coment\u00e1rios sobre o projeto Couchbase.Extensions.Caching, n\u00e3o deixe de conferir a se\u00e7\u00e3o Reposit\u00f3rio do GitHub<\/a> ou o F\u00f3runs do SDK do Couchbase .NET<\/a>.<\/p>\n<\/div>\n
\n
Como sempre, voc\u00ea pode entrar em contato comigo deixando um coment\u00e1rio abaixo ou encontrando-me em Twitter @mgroves<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"
Distributed caching can help to improve performance of an ASP.NET Core application. This is especially true for an ASP.NET application that\u2019s deployed to a server farm or scalable cloud environment. Using Couchbase Server for caching is one of the many […]<\/p>","protected":false},"author":71,"featured_media":3995,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1811,10126,1816],"tags":[1511,1239,2052],"ppma_author":[8937],"class_list":["post-3988","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dotnet","category-asp-dotnet","category-couchbase-server","tag-cache","tag-caching","tag-extensions"],"acf":[],"yoast_head":"\nDistributed caching with ASP.NET Core and Couchbase - The Couchbase Blog<\/title>\n<meta name=\"description\" content=\"Distributed caching can provide performance and scalability benefits to your ASP.NET Core application. 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