The document discusses the real-time web and various technologies used to enable real-time functionality on the web, including REST, websockets, streaming, webhooks, PubSubHubbub, and XMPP. Real-time updates are more efficient than periodic polling of data. Emerging standards like websockets allow for real-time data streams between clients and servers. Publish-subscribe protocols allow subscribers to receive real-time updates from publishers when data changes.

1. Real­time web
Cadec 2011
Niklas Gustavsson | niklas.gustavsson@callistaenterprise.se | @protocol7

2. REST won
(at least outside the 6irewall)
Out of 2724 public APIs
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3. 3 Real‐&me web © 2011 Callista Enterprise | www.callistaenterprise.se

4. Client­server
Short lived requests
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5. The Justin Bieber use case
5 Real‐&me web © 2011 Callista Enterprise | www.callistaenterprise.se

6. Polling (sometimes) sucks
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7. Or, it really sucks
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8. Enter real time web
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9. What about messaging, WS­Noti6ication
and all that great stuff?
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10. Streaming
(Comet, TwiLer, websockets)
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11. !"#$%&'()*+$,##-%./.
,##-$%./.$011$23
45')6'5$7$528!$9:);)(<<.<5$=
45')6'5$7$59:);)($(>?@&5$=
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45')6'5$7$5AB+$*$;)C:);)(5$=
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12. Websockets
12 Real‐&me web © 2011 Callista Enterprise | www.callistaenterprise.se

13. hLp://www.adambarth.com/experimental/websocket.pdf
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14. Webhooks
The Hollywood principle
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15. !"#$%&'()*+,-.*%/$$!&010
2%3'()*+,-.3%4%35)6.,.7%-8%9,8)1113:
3;699<6;=3%4%3>++?4&&@>,+)A,;)>'1;-A&6.*@)B*3%C
!"#$%&6.*@)B*%/$$!&010
2%36.*@)B3%4%DE%C
15 Real‐&me web © 2011 Callista Enterprise | www.callistaenterprise.se

16. Real‐&me web © 2011 Callista Enterprise | www.callistaenterprise.se

17. PubSubHubbub
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18. PubSubHubbub
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19. Subscriber
Publisher Subscriber
Subscriber
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20. Subscriber
Publisher Hub Subscriber
Subscriber
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21. Subscriber
Publisher Hub Hub Subscriber
Subscriber
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22. Hub <link>
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23. XMPP
(aka Jabber)
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24. Client
Server Server Client
Client
Server
Client
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25. http://superfeedr.com/documentation
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26. Case: distribuUng content
Sökmotor
2
Alfresco
EPiServer
1 2
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27. Sökmotor
3
Alfresco
PuSH EPiServer
2
3
1
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28. Publisher Subscriber
PubSub
engine
Publisher Subscriber
Publisher Subscriber
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29. PuSH
publisher PubSub
engine
Twitter PuSH
Stream API subscriber
publisher
Websocket
subscriber
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30. Open source
http://code.google.com/p/oppna‐program‐pubsub‐service
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31. Demo
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32. The players
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33. #cadec
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34. http://dev.twitter.com/pages/streaming_api
http://wiki.webhooks.org/
More?
hLp://xmpp.org/
hLp://s4.io/
hLp://code.google.com/p/pubsubhubbub/
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35. ?
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