{"id":2238,"date":"2016-04-29T00:41:35","date_gmt":"2016-04-29T00:41:35","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2238"},"modified":"2016-04-29T00:41:35","modified_gmt":"2016-04-29T00:41:35","slug":"getting-started-ratpack-couchbase","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/getting-started-ratpack-couchbase\/","title":{"rendered":"Introdu\u00e7\u00e3o ao Ratpack e ao Couchbase"},"content":{"rendered":"

Recentemente, comecei a brincar com Ratpack<\/a>. \u00a0<\/p>\n

\u00c9 um conjunto de bibliotecas Java para a cria\u00e7\u00e3o de aplicativos HTTP modernos.<\/p><\/blockquote>\n

Para ir al\u00e9m dessa defini\u00e7\u00e3o simples, o Ratpack \u00e9 n\u00e3o bloqueador, ass\u00edncrono e baseado em rede. Um pouco como o nosso Java SDK<\/a>. Portanto, ele \u00e9 um candidato natural para uma estrutura de aplicativo leve.<\/p>\n

Uma das primeiras coisas que voc\u00ea pode fazer ao testar uma nova estrutura da Web \u00e9 criar uma API b\u00e1sica. E a cria\u00e7\u00e3o de um CRUD simples \u00e9 natural quando voc\u00ea trabalha com um banco de dados de documentos como o Couchbase. Portanto, este post \u00e9 uma introdu\u00e7\u00e3o b\u00e1sica ao Ratpack, apresentando a abstra\u00e7\u00e3o do reposit\u00f3rio de entidades do Couchbase dispon\u00edvel com nosso Java SDK. N\u00e3o vou me concentrar na API em si, mas mais no mecanismo usado no Ratpack e no reposit\u00f3rio do Couchbase.<\/p>\n

Criando um projeto Java do Ratpack<\/h2>\n

A maioria dos usu\u00e1rios do Ratpack que conhe\u00e7o tende a programar com Groovy. Normalmente, estou codificando em Java, portanto, \u00e9 isso que vou usar hoje. O in\u00edcio r\u00e1pido<\/a> No entanto, os guias que voc\u00ea encontrar\u00e1 para o Ratpack ter\u00e3o Groovy. O modelo lazybones \u00e9 um modelo em Groovy, por exemplo. Ent\u00e3o, comecei gerando um projeto Java Gradle simples em meu IDE favorito. Em seguida, abri o arquivo build.gradle<\/code> e o completei com as depend\u00eancias corretas. Adicionei o arquivo jcentro<\/em> uma depend\u00eancia do ratpack-gradle 1.3.3 e me certifiquei de que estava usando o reposit\u00f3rio io.ratpack.ratpack-java<\/code> plugin. E n\u00e3o vamos nos esquecer da depend\u00eancia do Couchbase.<\/p>\n

\nbuildscript {\n  repositories {\n    jcenter()\n  }\n  dependencies {\n    classpath \"io.ratpack:ratpack-gradle:1.3.3\"\n  }\n}\n\napply plugin: \"io.ratpack.ratpack-java\"\napply plugin: 'eclipse'\n\nsourceCompatibility = 1.8\nversion = '1.0'\njar {\n    manifest {\n        attributes 'Implementation-Title': 'Ratpack Couchbase Repository Sample',\n                   'Implementation-Version': version\n    }\n}\n\nrepositories {\n    mavenCentral()\n    jcenter()\n}\n\ndependencies {\n  compile \"com.couchbase.client:java-client:2.2.5\" \n}\n\nmainClassName = \"org.couchbase.devex.Application\"\n\ntest {\n    systemProperties 'property': 'value'\n}\n<\/code><\/pre>\n
A pr\u00f3xima etapa \u00e9 iniciar o aplicativo com um simples Hello World. Tenho uma classe Application, como voc\u00ea pode ver no arquivo de compila\u00e7\u00e3o acima, com a classe mainClassName<\/code> op\u00e7\u00e3o. Tudo o que farei aqui para come\u00e7ar \u00e9 ativar o servidor Ratpack e registrar o caminho de URL '\/hello' para retornar uma mensagem Hello World.<\/p>\n
O Ratpack tem Manipuladores<\/a> objetos. Um manipulador \u00e9 uma fun\u00e7\u00e3o com um contexto como par\u00e2metro. Voc\u00ea pode associar um manipulador a um caminho. Portanto, aqui vou associar uma fun\u00e7\u00e3o Handler ao caminho '\/hello'. Para entender o Ratpack, \u00e9 preciso entender os manipuladores, pois voc\u00ea os usar\u00e1 em todos os seus aplicativos.<\/p>\n
O ponto de entrada em um aplicativo Ratpack \u00e9 a classe RatpackServer. Nessa classe, voc\u00ea pode usar o m\u00e9todo est\u00e1tico iniciar<\/code>. Ele usa uma fun\u00e7\u00e3o com um objeto RatpackServerSpec como par\u00e2metro. Esse objeto fornece a voc\u00ea uma API fluente para configurar o servidor. A \u00fanica coisa que preciso fazer aqui \u00e9 adicionar meu manipulador. O manipuladores<\/code> recebe como par\u00e2metro uma fun\u00e7\u00e3o com uma cadeia de manipuladores. A partir dessa cadeia, posso criar meu manipulador:<\/p>\n
\npackage org.couchbase.devex;\n\nimport ratpack.server.RatpackServer;\n\npublic class Application {\n\n  public static void main(String... args) throws Exception {\n    RatpackServer\n        .start(server -> server.handlers(chain -> chain.path(\"hello\", ctx -> ctx.render(\"Hello World!\"))));\n  }\n\n}\n<\/code><\/pre>\n
Quando inicio o aplicativo e vou para localhost:5050\/hello, recebo minha mensagem hello. Passando para a parte do Couchbase.<\/p>\n
O modelo de entidade do Couchbase<\/h2>\n
O modelo de entidade apareceu com a vers\u00e3o 2.2.x. Voc\u00ea pode declarar a entidade facilmente usando a anota\u00e7\u00e3o @Id do Couchbase. Tamb\u00e9m \u00e9 necess\u00e1rio certificar-se de que sua classe de entidade tenha um construtor p\u00fablico com zero arg e que o setter e o getter estejam dispon\u00edveis para os campos que voc\u00ea deseja no documento JSON resultante. Para modelar um usu\u00e1rio com nome de usu\u00e1rio, idade, nome e sobrenome, uso a seguinte classe User:<\/p>\n
\npackage org.couchbase.devex;\n\nimport com.couchbase.client.java.repository.annotation.Field;\nimport com.couchbase.client.java.repository.annotation.Id;\n\npublic class User {\n\n  @Id\n  private String username;\n\n  private Integer age;\n\n  @Field(\"fName\")\n  private String firstName;\n\n  @Field(\"lName\")\n  private String lastName;\n\n  public User() {}\n\n  public User(String username, Integer age, String firstName, String lastName) {\n    this.username = username;\n    this.age = age;\n    this.firstName = firstName;\n    this.lastName = lastName;\n  }\n\n  public String getUsername() {\n    return username;\n  }\n\n  public void setUsername(String username) {\n    this.username = username;\n  }\n\n  public Integer getAge() {\n    return age;\n  }\n\n  public void setAge(Integer age) {\n    this.age = age;\n  }\n\n  public String getFirstName() {\n    return firstName;\n  }\n\n  public void setFirstName(String firstName) {\n    this.firstName = firstName;\n  }\n\n  public String getLastName() {\n    return lastName;\n  }\n\n  public void setLastName(String lastName) {\n    this.lastName = lastName;\n  }\n\n  @Override\n  public String toString() {\n    return \"User [username=\" + username + \", age=\" + age + \", firstName=\" + firstName + \", lastName=\" + lastName\n        + \"]\";\n  }\n\n}\n<\/code><\/pre>\n
A anota\u00e7\u00e3o @Id \u00e9 obrigat\u00f3ria e define o campo que ser\u00e1 usado como chave do seu documento. Voc\u00ea pode usar a anota\u00e7\u00e3o @Field para alterar o nome das propriedades em seu documento JSON resultante. Observe tamb\u00e9m que o campo @Id n\u00e3o estar\u00e1 no JSON.<\/p>\n
Essa classe de entidade deve ser usada com a classe EntidadeDocumento<\/a>. Seu uso \u00e9 muito semelhante ao do outras implementa\u00e7\u00f5es de documentos<\/a> dispon\u00edvel com o SDK. O c\u00f3digo a seguir criar\u00e1 um documento JSON no Couchbase:<\/p>\n
\n  User user = new User(\"ldoguin\", 31, \"Laurent\", \"Doguin\");\n  EntityDocument document = EntityDocument.create(user);\n  Repository repo = CouchbaseCluster.create().openBucket().repository();\n  repo.upsert(document);\n<\/code><\/pre>\n
Que criam o seguinte documento:<\/p>\n
Legenda: ldoguin<\/p>\n
Valor: { \"lName\": \"Doguin\", \"age\": 31, \"fName\": \"Laurent\" }<\/p>\n
No momento, esse c\u00f3digo est\u00e1 bloqueando e \u00e9 s\u00edncrono. Isso \u00e9 ruim? Depende :) Se voc\u00ea estiver executando um c\u00f3digo bloqueante em uma thread n\u00e3o bloqueante, como faria se ele estivesse sendo executado no lugar do hello world acima, ent\u00e3o voc\u00ea estar\u00e1 bloqueando todo o resto. E sim, isso seria uma coisa ruim. Porque esse thread gerencia o loop de eventos que trata de todas as solicita\u00e7\u00f5es. Eu encontrei esta postagem do blog<\/a> bastante \u00fatil para entender isso.<\/p>\n
Um dos objetivos do Ratpack&apos \u00e9 ajud\u00e1-lo a usar o c\u00f3digo de bloqueio em uma ass\u00edncrono, sem bloqueio<\/a> manipulador. O Ratpack usa Promessa<\/a> como uma forma de gerenciar o c\u00f3digo ass\u00edncrono. E ele tamb\u00e9m oferece uma primitiva de bloqueio que recebe uma fun\u00e7\u00e3o como argumento e retorna uma promessa. A fun\u00e7\u00e3o executar\u00e1 o c\u00f3digo de bloqueio. Aqui tenho um exemplo que cria um usu\u00e1rio ao acessar o URL localhost:5050\/create e o retorna ao acessar o URL localhost:5050\/get:<\/p>\n
\n  public static void main(String... args) throws Exception {\n    RatpackServer.start(server -> server.handlers(chain -> chain.path(\"create\", ctx -> {\n      Blocking.get(() -> {\n        EntityDocument document = EntityDocument.create(new User(\"ldoguin\", 31, \"Laurent\", \"Doguin\"));\n        Repository repo = CouchbaseCluster.create().openBucket().repository();\n        return repo.upsert(document);\n      }).then(entityDoc -> ctx.render(\"OK\"));\n    }).path(\"get\", ctx -> {\n      Blocking.get(() -> {\n        Repository repo = CouchbaseCluster.create().openBucket().repository();\n        EntityDocument ldoguin = repo.get(\"ldoguin\", User.class);\n        return ldoguin;\n      }).then(user -> ctx.render(user.content().toString()));\n    })\n    ));\n  }\n<\/code><\/pre>\n
Deixando de lado o fato de que essa \u00e9 provavelmente a API mais mal projetada de todos os tempos, isso deve lhe dar uma ideia de como voc\u00ea pode executar c\u00f3digo s\u00edncrono e de bloqueio em um manipulador ass\u00edncrono com o Ratpack. Esse \u00e9 o primeiro passo para migrar um aplicativo existente para o Ratpack.<\/p>\n
Mas esse exemplo n\u00e3o mostra realmente todas as vantagens do nosso SDK baseado em RxJava. Portanto, na pr\u00f3xima postagem, mostrarei como usar o RxJava e o Ratpack junto com a vers\u00e3o Async do Repository.<\/p>","protected":false},"excerpt":{"rendered":"
I recently started playing with Ratpack. \u00a0 It's a set of Java libraries for buiding modern HTTP applications. To go beyond that simple definition, Ratpack is non-blocking, asynchronous and netty-based. A bit like our Java SDK. 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