{"id":1623,"date":"2014-12-16T19:32:51","date_gmt":"2014-12-16T19:32:50","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1623"},"modified":"2017-04-27T10:33:02","modified_gmt":"2017-04-27T17:33:02","slug":"hello-world-couchbase-and-java","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/hello-world-couchbase-and-java\/","title":{"rendered":"Hello World com Couchbase e Java"},"content":{"rendered":"

Meu livro t\u00e9cnico favorito de todos os tempos foi o Linguagem de programa\u00e7\u00e3o C<\/a> por Kernighan e Ritchie, carinhosamente chamado de K&R<\/a>. Eles popularizaram um termo que sempre estar\u00e1 no vocabul\u00e1rio dos desenvolvedores - Ol\u00e1 mundo<\/em>.<\/p>\n

\n
#inclui <\/span>
\nprincipal(<\/span>)<\/span>
\n{<\/span>
\nprintf<\/span><\/a>(<\/span>\"Hello Worldn<\/span>“<\/span>)<\/span>;<\/span>
\n}<\/span><\/div>\n<\/div>\n

Esse programa de apar\u00eancia inofensiva ajudou a lan\u00e7ar a carreira de muitos programadores e foi a base do grande sucesso de muitas APIs. Dennis Ritchie, que faleceu recentemente, ou como alguns chamam, retornou de principal()<\/strong>O Unix, tamb\u00e9m foi inspirador na cria\u00e7\u00e3o do sistema operacional Unix.<\/p>\n

Ent\u00e3o, sem mais delongas, aqui est\u00e1 o Hello World para o Couchbase<\/em>.<\/p>\n

\n
\n
\n

importa\u00e7\u00e3o<\/span> java.net.URI<\/span>;<\/span>
\nimporta\u00e7\u00e3o<\/span> java.util.List<\/span>;<\/span>
\nimporta\u00e7\u00e3o<\/span> java.util.ArrayList<\/span>;<\/span>
\nimporta\u00e7\u00e3o<\/span> com.couchbase.client.CouchbaseClient<\/span>;<\/span><\/p>\n

p\u00fablico<\/span> classe<\/span> HelloCouchbase {<\/span>
\np\u00fablico<\/span> est\u00e1tico<\/span> vazio<\/span> principal(<\/span>Cordas<\/span><\/a> argumentos[<\/span>]<\/span>)<\/span> {<\/span>
\ntentar<\/span> {<\/span>
\nURI local =<\/span> novo<\/span> URI(<\/span>\"https:\/\/localhost:8091\/pools\"<\/span>)<\/span>;<\/span>
\nLista<<\/span>URI><\/span> baseURIs =<\/span> novo<\/span> ArrayList<<\/span>URI><\/span>(<\/span>)<\/span>;<\/span>
\nbaseURIs.adicionar<\/span>(<\/span>local)<\/span>;<\/span><\/p>\n

CouchbaseClient c =<\/span> novo<\/span> Cliente Couchbase(<\/span>baseURIs, \"default\"<\/span>, “”<\/span>)<\/span>;<\/span>
\nc.definir<\/span>(<\/span>\"chave\"<\/span>, 0<\/span>, \"Hello World\"<\/span>)<\/span>;<\/span>
\nSistema<\/span><\/a>.fora<\/span>.println<\/span>(<\/span>c.obter<\/span>(<\/span>\"chave\"<\/span>)<\/span>)<\/span>;<\/span>
\n}<\/span> captura<\/span> (<\/span>Exce\u00e7\u00e3o<\/span><\/a> e)<\/span> {<\/span>
\nSistema<\/span><\/a>.erro<\/span>.println<\/span>(<\/span>\"Erro ao conectar ao Couchbase: \"<\/span>
\n+<\/span> e.getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\nSistema<\/span><\/a>.sa\u00edda<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
\n}<\/span>
\n}<\/span>
\n}<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n

\u00c9 certo que \u00e9 um programa muito mais longo.<\/p>\n

O que o programa faz \u00e9 simplesmente obter o valor de uma chave que acabou de ser definida. Entretanto, em um sistema distribu\u00eddo, n\u00e3o h\u00e1 garantias devido \u00e0 natureza din\u00e2mica inerente do sistema. O oito fal\u00e1cias da computa\u00e7\u00e3o distribu\u00edda <\/a>entra em mais detalhes sobre isso. Do ponto de vista do programador, as bibliotecas de clientes Java do Couchbase abstraem essa natureza din\u00e2mica de um cluster. Elas fornecem um conjunto b\u00e1sico de opera\u00e7\u00f5es, como obter<\/em> e definir<\/em> que est\u00e1 dispon\u00edvel em formas s\u00edncronas ou ass\u00edncronas. \u00c9 poss\u00edvel usar essas opera\u00e7\u00f5es simples em conjunto com opera\u00e7\u00f5es que ajudam a implementar a atomicidade, como check and set(cas)<\/em> para implementar sistemas de alto desempenho e dimension\u00e1veis para o mundo real.<\/p>\n

Mais do que isso e estarei me desviando da filosofia do Ol\u00e1 mundo<\/em>.<\/p>\n

Estarei contribuindo mais para o uso do Couchbase com as bibliotecas de clientes Java, mas, enquanto isso, aqui est\u00e3o alguns links \u00fateis.<\/p>\n

Download e instala\u00e7\u00e3o do Couchbase Server<\/a><\/p>","protected":false},"excerpt":{"rendered":"

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Ele falou sobre diversos t\u00f3picos t\u00e9cnicos em confer\u00eancias em todo o mundo, conduziu e organizou laborat\u00f3rios pr\u00e1ticos e ministrou aulas de p\u00f3s-gradua\u00e7\u00e3o \u00e0 noite. Rags traz consigo cerca de 20 anos de desenvolvimento pr\u00e1tico de software e cerca de 10 anos de experi\u00eancia em arquitetura e evangelismo tecnol\u00f3gico. Ele trabalhou na Digital Equipment Corporation, Sun Microsystems, Intuit e Accenture. Trabalhou em v\u00e1rias \u00e1reas de tecnologia, incluindo os aspectos internos do VMS, Unix e NT para Hadoop e HBase. Ele evangelizou e influenciou a arquitetura de v\u00e1rias \u00e1reas de tecnologia, incluindo as primeiras vers\u00f5es do JavaFX, Java, Java EE, Java e XML, Java ME, AJAX e Web 2.0, Java Security e assim por diante. Rags tem mestrado em Ci\u00eancia da Computa\u00e7\u00e3o pelo Center of Advanced Computer Studies da Universidade de Louisiana em Lafayette."}],"_links":{"self":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/posts\/1623","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/users\/33"}],"replies":[{"embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/comments?post=1623"}],"version-history":[{"count":0,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/posts\/1623\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/media\/13873"}],"wp:attachment":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/media?parent=1623"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/categories?post=1623"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/tags?post=1623"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/ppma_author?post=1623"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}