{"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\/how-to-use-sync-gateway-and-peer-to-peer-sync-on-android\/","title":{"rendered":"How to use Sync Gateway and Peer-to-Peer sync on Android"},"content":{"rendered":"

This example is a simple Android application<\/a> 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 being in a separate tab.<\/p>\n

Unique (1st tab):<\/strong> The _id<\/strong> field is randomly generated by Couchbase Lite. A new document is persisted to the database every time the Save<\/strong> button is pressed. The document stored will have the following properties:<\/p>\n

\n
<\/div>\n
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1<\/div>\n
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7<\/div>\n<\/div>\n<\/td>\n
\n
\n
{<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>“_id”<\/span>:<\/span> “008c30d0-0f57-4477-8fa5-b9685f410f9e”<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>“_rev”<\/span>:<\/span> “1-38fd691714c1ed19ce48a1f4a87c20d9”<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>“name”<\/span>:<\/span> “chef123”<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>“rating”<\/span>:<\/span> 4<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>“type”<\/span>:<\/span> “unique”<\/span><\/div>\n
}<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Conflict (2nd tab):<\/strong> The _id<\/strong> field is set to whatever the user entered in the text input. Pressing Save<\/strong> will persist a new document to the database or update it if one already exists with this ID.<\/p>\n

\n
<\/div>\n
\n\n\n\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> “1-38fd691714c1ed19ce48a1f4a87c20d9”<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>“rating”<\/span>:<\/span> 4<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>“type”<\/span>:<\/span> “conflict”<\/span><\/div>\n
}<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

P2P (3rd tab):<\/strong> The text input field takes the URL of a target Couchbase Lite or Sync Gateway database of the form https:\/\/{ip}:55000\/ratingapp<\/code>.<\/p>\n

Below the ViewPager, there is a Switch<\/strong> toggle button to start\/stop the continuous pull\/push replications to a remote database. This would usually be the URL of the Sync Gateway running on the cloud. You can change the remote URL in StorageManager.java<\/code> to your own Sync Gateway instance (see section below to deploy Couchbase Server and Sync Gateway).<\/p>\n

Finally, there is a table on the bottom half of the screen that displays the following:<\/p>\n

On the 1st tab, it shows the number of reviews for each possible value. It\u2019s using a query with a group level set to 1 to aggregate the documents with the same rating and a reduce function to count them.<\/p>\n

The code to register the view is in StorageManager.java<\/strong>:<\/p>\n

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View <\/span>ratingsView<\/span> =<\/span> database<\/span>.<\/span>getView<\/span>(<\/span>UNIQUE_RATINGS_VIEW<\/span>)<\/span>;<\/span><\/div>\n
ratingsView<\/span>.<\/span>setMapReduce<\/span>(<\/span>new<\/span> Mapper<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>@<\/span>Override<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> void<\/span> map<\/span>(<\/span>Map<\/span>&<\/span>lt<\/span>;<\/span>String<\/span>,<\/span> Object<\/span>&<\/span>gt<\/span>;<\/span> document<\/span>,<\/span> Emitter <\/span>emitter<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span> (<\/span>document<\/span>.<\/span>get<\/span>(<\/span>“type”<\/span>)<\/span>.<\/span>equals<\/span>(<\/span>“unique”<\/span>)<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>emitter<\/span>.<\/span>emit<\/span>(<\/span>document<\/span>.<\/span>get<\/span>(<\/span>“rating”<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>,<\/span> null<\/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> new<\/span> Reducer<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>@<\/span>Override<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> Object<\/span> reduce<\/span>(<\/span>List<\/span><<\/span>object<\/span> width<\/span>=<\/span>“300”<\/span> height<\/span>=<\/span>“150”<\/span>><\/span> keys<\/span>,<\/span> List<\/span><<\/span>object<\/span>><\/span> values<\/span>,<\/span> boolean<\/span> rereduce<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span> new<\/span> Integer<\/span>(<\/span>values<\/span>.<\/span>size<\/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
And<\/span> a<\/span> live <\/span>query <\/span>is<\/span> instantiated <\/span>in<\/span> <<\/span>strong<\/span>><\/span>MainActivity<\/span>.<\/span>java<\/span><<\/span>\/<\/span>strong<\/span>><\/span> to<\/span> notify <\/span>the <\/span>Recycler <\/span>View <\/span>adapter <\/span>when <\/span>the <\/span>view <\/span>index <\/span>has <\/span>changed<\/span>:<\/span><\/div>\n
<<\/span>pre<\/span>><\/span><\/div>\n
LiveQuery <\/span>liveQuery<\/span> =<\/span> storageManager<\/span>.<\/span>database<\/span>.<\/span>getView<\/span>(<\/span>StorageManager<\/span>.<\/span>UNIQUE_RATINGS_VIEW<\/span>)<\/span>.<\/span>createQuery<\/span>(<\/span>)<\/span>.<\/span>toLiveQuery<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
liveQuery<\/span>.<\/span>setGroupLevel<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/div>\n
liveQuery<\/span>.<\/span>setDescending<\/span>(<\/span>true<\/span>)<\/span>;<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

On the 2nd and 3rd tab, it displays the number of conflicting revisions of a document. It only shows the number of conflicting revisions but it would also be possible to resolve the conflicts by using the database.getDocument({id}).getConflictingRevisions()<\/code> method.<\/p>\n

Deploying Sync Gateway and Couchbase Server<\/h2>\n

Deploy a fresh Sync Gateway and Couchbase Server instance for this application with Tutum. Log on or create a new account on Tutum.co, then link it to your PaaS account (Digital Ocean, AWS\u2026). On the Nodes<\/strong> tab, create a new node and choose the PaaS of your choice. In the tag<\/strong> field, add rating-app<\/strong>.Next, select the Stacks<\/strong> tab with this Tutum file<\/a> and click create. This stack includes a Sync Gateway container linked with a Couchbase Server container.NOTE:<\/strong> The Sync Gateway container will fail to run because it\u2019s trying to connect to a Couchbase Server bucket that doesn\u2019t exist. It may take several minutes for Couchbase Server to be deployed and for the admin console to be reachable on https:\/\/{ip}:8091<\/code>. Once it\u2019s reachable, create an account and a bucket called default<\/strong> (the Sync Gateway configuration file expects the bucket to be named default<\/strong>). Once the bucket is created, head back to the Tutum Services<\/strong> tab and restart the Sync Gateway container (or just click the Run<\/strong> button as it should be stopped).<\/p>\n

Removing all documents from a database<\/h2>\n

Use the delete-documents\/delete.js<\/a> script to remove all documents in a particular database. It could be a Couchbase Lite or Sync Gateway database. Replace the hostname in the script with the one of the target database you wish to delete the documents from.<\/p>\n","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>\n","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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