Understanding the Streaming API

Quick start guide to RealTime Force

@gwestrGreg Wester

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Agenda

• Introducing RealTime Force• Sample application• Code walk through• Q&A

Streaming 101

• An API that delivers near real time notifications• Uses industry standard technique – “comet”• Does not count against REST/SOAP API daily limit• Available right now for all Salesforce customers

Streaming Surface Area

• Notification generated on SObject create or update• One change in the system will notify many users

• respects existing CRUD, FLS, sharing rules• Opt in to notifications by creating a SOQL query

• administrators create queries for organization

Streaming Terminology

• Long polling• Event• Notification• Push Topic• Bayeux Protocol

• handshake• subscribe• connect• unsubscribe• disconnect

Streams of JSON

Getting Started

• Start with a VisualForce Page• Add a Javascript CometD client• Asynchronously wait for events• Update the page through the DOM

Demo

Code: Apex Page

Code: CometD JS Client init

Code: CometD JS handler

Q&A

• Documentation – http://tinyurl.com/cometsfdc• Code – http://github.com/gwestersfdc/StreamingLab• Streaming Lab on AppExchange soon

Thank you!

• Follow me on Twitter - @gwestr