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Performance Challenges for the Open Web

Performance Challenges for the Open Web. Stanford CS193H 29 September 2008. Background: making the web work better. I’ve been abusing web browsers for 15 years http://josephsmarr.com I used to work on AJAX / JS performance

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Performance Challenges for the Open Web

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  1. Performance Challenges for the Open Web Stanford CS193H 29 September 2008

  2. Background: making the web work better • I’ve been abusing web browsers for 15 years • http://josephsmarr.com • I used to work on AJAX / JS performance • http://josephsmarr.com/2007/07/25/high-performance-javascript-oscon-2007 • Video:http://developer.yahoo.net/blogs/theater/archives/2007/08/joseph_smarr_highperformance_j.html • Now I’m helping open up the social web • http://josephsmarr.com/2008/09/22/tying-it-all-together-implementing-the-open-web-web-20-expo-new-york • Weekly video podcast: thesocialweb.tv • Open Web has new performance challenges • Making multiple sites play well together • Privacy, transparency, flexibility, simplicity

  3. In a world with lots of socially-aware sites…

  4. …and lots of “open social web” building blocks…

  5. …how do the pieces fit together? …and what will the new Social Web look like?

  6. Reminder: The social web today is broken… • On each site, we still have to: • Re-create an account • Re-enter our profile info • Re-find our friends • Re-establish our relationships • New social apps have limited options: • Create yet-another-silo (and start from scratch) -or- • Make a widget inside an existing walled garden

  7. …but we know how to make things better!

  8. Create a portable, durable online identity • OpenID • Sign up / sign in with an existing account • Link / share your profile data between sites

  9. Example: Sign up for Plaxo with OpenID

  10. Create a portable, durable online identity • OpenID • Sign up / sign in with an existing account • Link / share your profile data between sites • rel=me (XFN) • Consolidate your online identity with me-links • Social Graph API • See what your users said about themselves

  11. Build and maintain real relationships • Contact APIs • Find people from your current address book • Leverage previously established relationships • OAuth • Share private data between trusted sites • Friends-list portability • Continuous discovery across multiple sites

  12. “A periodic check of new people from your networks on other sites”

  13. Stay up-to-date with the people you know • OpenSocial • Build social apps that can run anywhere

  14. OpenSocial

  15. OpenSocial: Large and Growing Rapidly

  16. Stay up-to-date with the people you know • OpenSocial • Build social apps that can run anywhere • RSS / Atom • Syndicate your activity to share with others • Jabber (XMPP) • Real-time update stream between sites

  17. Building blocks in action: contacts portability • User signs in with an OpenID • Site fetches OpenID URL  looks for X-XRDS-Location • Site parses XRDS-Simple doc to discover available APIs Site tries to access contacts API  gets a 401 • WWW-Authenticate response header specifies OAuth • OAuth Discovery (via XRDS) provides OAuth endpoints Site sends user though OAuth flow to grant access • User returns to site with authorized access token • Site can now access users’ contacts data via API + token

  18. Performance Challenges • Minimizing round trips • Discovery, Association, OpenID, OAuth, etc. • Combining steps vs. small pieces loosely joined • JSON-RPC in OpenSocial (batching API calls) • Caching: freshness vs. performance • Policies for how long to store personal data • Social Graph API: cached web crawl • Server-alerted notifications

  19. Performance Challenges (cont.) • Pull vs. push: aggregating activity • Polling is easy but inefficient & doesn’t scale (1000 users every 15 min > 1 hit per sec) • XMPP & Gnip: receive update notifications • Integrating 3rd party content • Server-side (proxied) vs. client-side (JS onload) • Iframe vs. inline • New techniques: XFBML, Caja, etc.

  20. …so how do these building blocks fit together?

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