{"id":1975,"date":"2015-10-01T15:06:09","date_gmt":"2015-10-01T15:06:08","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1975"},"modified":"2018-12-18T08:12:28","modified_gmt":"2018-12-18T16:12:28","slug":"how-to-use-sync-gateway-and-peer-to-peer-sync-on-android","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/how-to-use-sync-gateway-and-peer-to-peer-sync-on-android\/","title":{"rendered":"Como usar o Sync Gateway e a sincroniza\u00e7\u00e3o ponto a ponto no Android"},"content":{"rendered":"

Este exemplo \u00e9 um aplicativo Android simples<\/a> no qual o usu\u00e1rio pode salvar uma avalia\u00e7\u00e3o com uma propriedade de classifica\u00e7\u00e3o e nome em um banco de dados Couchbase Lite. Ele usa os componentes TabLayout e ViewPager para ilustrar tr\u00eas cen\u00e1rios diferentes, cada um deles em uma guia separada.<\/p>\n

\u00danico (1\u00aa guia):<\/strong> O _id<\/strong> \u00e9 gerado aleatoriamente pelo Couchbase Lite. Um novo documento \u00e9 persistido no banco de dados sempre que o campo Salvar<\/strong> for pressionado. O documento armazenado ter\u00e1 as seguintes propriedades:<\/p>\n

\n
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\n
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{<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"_id\"<\/span>:<\/span> \u201c008c30d0-0f57-4477-8fa5-b9685f410f9e\u201d<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"_rev\"<\/span>:<\/span> \u201c1-38fd691714c1ed19ce48a1f4a87c20d9\u201d<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"name\" (nome)<\/span>:<\/span> \"chef123\"<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"classifica\u00e7\u00e3o\"<\/span>:<\/span> 4<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"tipo\"<\/span>:<\/span> \"\u00fanico\"<\/span><\/div>\n
}<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Conflito (2\u00aa guia):<\/strong> O _id<\/strong> \u00e9 definido como o valor que o usu\u00e1rio digitou na entrada de texto. Pressionar Salvar<\/strong> manter\u00e1 um novo documento no banco de dados ou o atualizar\u00e1 se j\u00e1 existir um com essa ID.<\/p>\n

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{<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"_id\"<\/span>:<\/span> \"chef123\"<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"_rev\"<\/span>:<\/span> \u201c1-38fd691714c1ed19ce48a1f4a87c20d9\u201d<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"classifica\u00e7\u00e3o\"<\/span>:<\/span> 4<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>\"tipo\"<\/span>:<\/span> \"conflito\"<\/span><\/div>\n
}<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

P2P (3\u00aa guia):<\/strong> O campo de entrada de texto recebe a URL de um banco de dados de destino do Couchbase Lite ou do Sync Gateway no formato https:\/\/{ip}:55000\/ratingapp<\/code>.<\/p>\n

Abaixo do ViewPager, h\u00e1 um Interruptor<\/strong> bot\u00e3o de altern\u00e2ncia para iniciar\/parar as replica\u00e7\u00f5es pull\/push cont\u00ednuas para um banco de dados remoto. Normalmente, esse seria o URL do Sync Gateway em execu\u00e7\u00e3o na nuvem. Voc\u00ea pode alterar o URL remoto em StorageManager.java<\/code> para sua pr\u00f3pria inst\u00e2ncia do Sync Gateway (consulte a se\u00e7\u00e3o abaixo para implantar o Couchbase Server e o Sync Gateway).<\/p>\n

Por fim, h\u00e1 uma tabela na metade inferior da tela que exibe o seguinte:<\/p>\n

Na primeira guia, ele mostra o n\u00famero de avalia\u00e7\u00f5es para cada valor poss\u00edvel. Ele est\u00e1 usando uma consulta com um n\u00edvel de grupo definido como 1 para agregar os documentos com a mesma classifica\u00e7\u00e3o e uma fun\u00e7\u00e3o de redu\u00e7\u00e3o para cont\u00e1-los.<\/p>\n

O c\u00f3digo para registrar a exibi\u00e7\u00e3o est\u00e1 em StorageManager.java<\/strong>:<\/p>\n

\n
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Ver <\/span>classifica\u00e7\u00f5esVer<\/span> =<\/span> banco de dados<\/span>.<\/span>getView<\/span>(<\/span>UNIQUE_RATINGS_VIEW<\/span>)<\/span>;<\/span><\/div>\n
classifica\u00e7\u00f5esVer<\/span>.<\/span>setMapReduce<\/span>(<\/span>novo<\/span> Mapeador<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>@<\/span>Substituir<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>p\u00fablico<\/span> vazio<\/span> mapa<\/span>(<\/span>Mapa<\/span>&<\/span>lt<\/span>;<\/span>Cordas<\/span>,<\/span> Objeto<\/span>&<\/span>gt<\/span>;<\/span> documento<\/span>,<\/span> Emissor <\/span>emissor<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>se<\/span> (<\/span>documento<\/span>.<\/span>obter<\/span>(<\/span>\"tipo\"<\/span>)<\/span>.<\/span>iguais<\/span>(<\/span>\"\u00fanico\"<\/span>)<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>emissor<\/span>.<\/span>emitir<\/span>(<\/span>documento<\/span>.<\/span>obter<\/span>(<\/span>\"classifica\u00e7\u00e3o\"<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>,<\/span> nulo<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
}<\/span>,<\/span> novo<\/span> Redutor<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>@<\/span>Substituir<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>p\u00fablico<\/span> Objeto<\/span> reduzir<\/span>(<\/span>Lista<\/span><<\/span>objeto<\/span> largura<\/span>=<\/span>“300”<\/span> altura<\/span>=<\/span>“150”<\/span>><\/span> chaves<\/span>,<\/span> Lista<\/span><<\/span>objeto<\/span>><\/span> valores<\/span>,<\/span> booleano<\/span> Reduzir<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>retorno<\/span> novo<\/span> Inteiro<\/span>(<\/span>valores<\/span>.<\/span>tamanho<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
}<\/span>,<\/span> “16”<\/span>)<\/span>;<\/span><\/div>\n
<\/div>\n
E<\/span> a<\/span> ao vivo <\/span>consulta <\/span>\u00e9<\/span> instanciado <\/span>em<\/span> <<\/span>forte<\/span>><\/span>Atividade principal<\/span>.<\/span>java<\/span><<\/span>\/<\/span>forte<\/span>><\/span> para<\/span> notificar <\/span>o <\/span>Reciclador <\/span>Ver <\/span>adaptador <\/span>quando <\/span>o <\/span>visualiza\u00e7\u00e3o <\/span>\u00edndice <\/span>tem <\/span>alterado<\/span>:<\/span><\/div>\n
<<\/span>pr\u00e9<\/span>><\/span><\/div>\n
LiveQuery <\/span>Consulta ao vivo<\/span> =<\/span> gerenciador de armazenamento<\/span>.<\/span>banco de dados<\/span>.<\/span>getView<\/span>(<\/span>Gerenciador de armazenamento<\/span>.<\/span>UNIQUE_RATINGS_VIEW<\/span>)<\/span>.<\/span>createQuery<\/span>(<\/span>)<\/span>.<\/span>toLiveQuery<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
Consulta ao vivo<\/span>.<\/span>setGroupLevel<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/div>\n
Consulta ao vivo<\/span>.<\/span>setDescending<\/span>(<\/span>verdadeiro<\/span>)<\/span>;<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Na segunda e terceira guias, ele exibe o n\u00famero de revis\u00f5es conflitantes de um documento. Ele mostra apenas o n\u00famero de revis\u00f5es conflitantes, mas tamb\u00e9m seria poss\u00edvel resolver os conflitos usando a fun\u00e7\u00e3o banco de dados.getDocument({id}).getConflictingRevisions()<\/code> m\u00e9todo.<\/p>\n

Implanta\u00e7\u00e3o do Sync Gateway e do Couchbase Server<\/h2>\n

Implante uma nova inst\u00e2ncia do Sync Gateway e do Couchbase Server para esse aplicativo com o Tutum. Fa\u00e7a login ou crie uma nova conta no Tutum.co e, em seguida, vincule-a \u00e0 sua conta PaaS (Digital Ocean, AWS...). Na p\u00e1gina N\u00f3s<\/strong> crie um novo n\u00f3 e escolha a PaaS de sua prefer\u00eancia. Na guia etiqueta<\/strong> campo, adicione aplicativo de classifica\u00e7\u00e3o<\/strong>Em seguida, selecione o Pilhas<\/strong> com esta guia Arquivo Tutum<\/a> e clique em criar. Essa pilha inclui um cont\u00eainer do Sync Gateway vinculado a um cont\u00eainer do Couchbase Server.OBSERVA\u00c7\u00c3O:<\/strong> O cont\u00eainer do Sync Gateway n\u00e3o ser\u00e1 executado porque est\u00e1 tentando se conectar a um bucket do Couchbase Server que n\u00e3o existe. Pode levar v\u00e1rios minutos para que o Couchbase Server seja implantado e para que o console de administra\u00e7\u00e3o esteja acess\u00edvel em https:\/\/{ip}:8091<\/code>. Quando estiver acess\u00edvel, crie uma conta e um bucket chamado padr\u00e3o<\/strong> (o arquivo de configura\u00e7\u00e3o do Sync Gateway espera que o bucket tenha o nome padr\u00e3o<\/strong>). Depois que o balde for criado, volte para o Tutum Servi\u00e7os<\/strong> e reinicie o cont\u00eainer do Sync Gateway (ou simplesmente clique na guia Executar<\/strong> pois ele deve ser interrompido).<\/p>\n

Remo\u00e7\u00e3o de todos os documentos de um banco de dados<\/h2>\n

Use o delete-documents\/delete.js<\/a> para remover todos os documentos em um determinado banco de dados. Pode ser um banco de dados do Couchbase Lite ou do Sync Gateway. Substitua o nome do host no script pelo nome do banco de dados de destino do qual voc\u00ea deseja excluir os documentos.<\/p>","protected":false},"excerpt":{"rendered":"

This example is a simple Android application in which the user can save a review with a rating and name property to a Couchbase Lite database. It uses the TabLayout and ViewPager components to illustrate 3 different scenarios, each one […]<\/p>","protected":false},"author":51,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[9028],"class_list":["post-1975","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nHow to use Sync Gateway and Peer-to-Peer sync on Android<\/title>\n<meta name=\"description\" content=\"Learn how to deploy Sync Gateway and Couchbase Server. 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