Join us to learn practical applications of the Streaming API, as well as technical implementation concerns. We?ll start by creating server-side Apex methods and then we?ll implement some basic JavaScript handlers to accept the real-time data updates. Finally, we?ll create a beautiful interface using Bootstrap to notify the user of a change. You'll walk away feeling comfortable with saying, ?Yes, we can do real-time updates in Force.com,? and have the documentation and examples to back that up.

1. Real Time Data Feeds Using the
Streaming API
Mike Tetlow, Bracket Labs, Developer
@Mikename

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3. Session Objectives
Implement Real Time Data Feeds with Visualforce pages
▪ Streaming API Implementation
• Basic implementation of Streaming API
• Display updates and notifications
▪ Streaming API Limitations and Alternatives
• Overview of Streaming API limits
• Using Apex Remote Actions to poll for updates

4. What is the Streaming API?
▪ Long polling approach to pushing updates
• Long lived connection to Salesforce waiting for changes in data
• Display updates and notifications
▪ Clients Subscribe to PushTopics
• PushTopics are linked to a SOQL query that watches for data changes
• When a change occurs the connection returns with the new data and reconnects
waiting for more changes

5. Streaming API Implementation Demo

6. Streaming API Limits
Description
Unlimited Edition
Enterprise Edition
All Other Editions
Max number of PushTopics per org
50
25
20
Max number of clients per topic
100
20
10
Max number of concurrent clients
1,000
500
10
Max number of events per 24hr
1,000,000
200,000
10,000 (1000 for free orgs)
Source: http://www.salesforce.com/us/developer/docs/api_streaming/Content/limits.htm

7. Alternatives
Interval Polling
▪ Short Polling approach which queries for updates
• Short lived connection which simply runs a method and returns the result of the
method
• Interval is scheduled and run from Browser.
▪ How Interval Poll on Salesforce
• Use Apex Remote Actions, they are easily executed from Javascript and loose
limits
• The Remote Action will return data from the controller and you can take almost any
action you want after parsing that data.

8. Polling Demo

9. Which one should I use!?!?
▪ Streaming API
• Use it if you can, it’s great, well thought out and is more efficient than anything else
out there.
▪ Polling alternative
• Use it if you are hitting limits around the Streaming API.
• Can use it if your data source is something other than a SOQL query. Think of all
the joins and data manipulation done in your average controller.
• Be careful. It’s not a good practice to poll repeatedly for data, but sometimes you
have no alternative. If you do this be considerate of the server and consider doing
some calculations on the client side.

10. Mike Tetlow
Bracket Labs
@Mikename

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