Cloudant e XPages

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This document provides an overview of using Cloudant as a NoSQL database with XPages applications. It discusses why the author chose Cloudant for an HR application, introduces Cloudant and how it works, and shows how to connect to Cloudant from XPages using a Cloudant connector. Code examples demonstrate storing, retrieving, searching, and attaching files in Cloudant from XPages applications.

A (XPages) developers
guide to Cloudant
Frank van der Linden
@flinden68

About me
• Freelance Full stack Java developer, with XPages experience
• Curious of new technology
• Owner of elstar IT
• Former IBM Champion (2013, 2014)

Roadmap
• Why Cloudant
• Introduction to Cloudant
• Inside Cloudant
• Connect to Cloudant
• Cloudant @ XPages

Why Cloudant
• For HR Assistant we wanted to use a different datastore

What is Cloudant
• It is the cloud version of CouchDb
• CouchDb is created by Damien Katz
• Cloudant is bought by IBM
• It is document based
• Is like MongoDb or NSF a NoSQL datastore

What is Cloudant
• Data stored as JSON
• View and Search ‘formula’ with javascript
• Replication
• Tasks
• Build in API
• No annoying limitations

Cloudant as service
• Cloudant can be added as service in BlueMix

Cloudant standalone
• Via website cloudant.com

Inside Cloudant
• View mapping
• Search index

Connect to Cloudant
• Direct via REST
• https://someusername:secret@account.cloudant.com
• Via a OSGi Plugin, uses the HTTPConnection
• https://bitbucket.org/flinden68/cloudant-connector

Connect to Cloudant
• Credentials
• Account, necessary for the OSGi plugin

$Connect to Cloudant • It is JSON everywhere • _rev and _id, reserved parameters • doc{}, is the actual data from application$

Cloudant connector
• Storing in and retrieving from Cloudant
• Can be accessed from Java backend.
• Will take out the security issues.
• Do the heavy lifting. Don't reinvent the wheel.
• https://bitbucket.org/flinden68/cloudant-connector

Cloudant @ XPages
• Repeat in XPages
• Columns - values from Job class

Cloudant @ XPages
• JobController - getJobs

Cloudant @ XPages
• CloudantService - connect
• Find the data in Cloudant

Cloudant @ XPages
• Job JSON in Cloudant

Attachment @ Cloudant
• Stored as base64 encoded String
• Can be as standalone
• Or as part of Document (we choose this way)
• Store id as attachmentId, so it can be retrieved when needed

Attachment @ Cloudant
• AttachmentController
• Convert upload to Attachment
object

Attachment @ Cloudant
• ControllerBase
• All controllers can use these methods

Attachment @ Cloudant
• Servlet is called in application for download
• base64 data for the image tag

RichText @ Cloudant
• Stored as MultiMimePart

RichText @ Cloudant
• Which is nice converted to JSON ;-)

Search @ Cloudant
• Cloudant job ftSearch index

Search @ Cloudant
• Search example, filter the view

Search @ Cloudant
• Do the search in the Controller,
call DAO

Search @ Cloudant
• Search method calls the CloudantService

Search @ Cloudant
• CloudantService calls connector to get the data

Resources
• OSGi Cloudant connector
• https://bitbucket.org/flinden68/cloudant-connector
• Cloudant documentation
• https://docs.cloudant.com/
• HR Assistant
• hrassistant.eu-gb.mybluemix.net
• github.com/flinden68/HR-Assistant

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