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Dimgba Kalu / @dkdimgba
Austine Iyke / @austynsx
Dimgba – is the Co-Founder at ProJaro / @projarong. He is
developer and loves everything PHP and JavaScript
Austin – is a developer at ProJaro / @projarong. He enjoys
the flexibility of JS and programs with PHP and Python
Definitions
Common Practices
Offline Data persistent methods
Available offline data persistence tools
Persistent Data denotes information that is infrequently accessed and not likely to be modified. The opposite of this is dynamic data (also known as transactional data) where information is asynchronously changed as further updates to the information become available ◦ https://en.wikipedia.org/wiki/Persistent_data
CRUD - Create, Read, Update and Delete
Each letter in the acronym can map to a standard SQL statement and HTTP method:
Typically we employ CRUD via RESTful APIs
Operation` SQL HTTP
Create INSERT PUT / POST
Read (Retrieve) SELECT GET
Update (Modify) UPDATE PUT / PATCH
Delete (Destroy) DELETE DELETE
Resource POST / create GET / read PUT / update DELETE / delete
/accounts Create a new account
List accounts Bulk update accounts
Delete all accounts
/accounts/123 Error Show account 123
If exists update account 123
If not error
Delete account 123
/customers Create a new customer
List customers Bulk update customers
Delete all customers
/customers/456 Error Show customer 456
If exists update customer 456
If not error
Delete customer 456
Solution: richer clients (using AngularJS , ReactJs, and others)
In browser databases available:◦ derby.js, Lawnchair, Sench touch,
The Ultimate Solution will be
Real-time data synchronization
Failures can happen on: client push, or client pull/ server push
Communicate or hide connectivity state◦ Chat app
Enable client-side creation and editing features◦ Todo app
Disable, modify, or hide features that won’t work◦ Facebook status, Twitter Tweets
Notify user about possibly conflicting data (Not recommended)
“You are offline”◦ “Unable to connect to the Internet”
◦ We need to stop treating offline as an error condition
Try not to block features completely◦ If you can’t update, show old data (with message)
◦ Let user create data locally to be sent later
Dealing with new incoming data. Options:◦ Show it as the most recent
◦ Show it in chronological order
Proprietary solution?
◦ Firebase
Firebase transparently reconnects to server
Open source local storage databases that sync
◦ Hoodie (Another JS db that syncs. In preview mode)
◦ remotestorage.io (IETF Proposed Standard)
◦ PouchDB (JavaScript database that syncs!)
Pros◦ AngularJS library (AngularFire)
◦ 3-way binding with $bind
◦ Free Developer (Hacker) plan
◦ Paid solution with premium support
◦ Hosted solution
◦ Highly scalable
◦ Can deploy static hosted apps
Cons◦ Proprietary solution
◦ Hosted solution (can’t run local or on own servers)
Pros:◦ Open Source
◦ Lightweight Cross Browser JavaScript implementation
◦ Syncs with open source CouchDB protocol servers
PouchDB-Server - a HTTP on top of PouchDB
Cloudant - A cluster aware fork of CouchDB
Couchbase Sync Gateway
Cons:◦ I’m biased
