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How to avoid the latency trap and lessons  about software design
Tom Hughes-Croucher ,[object Object]
What is the latency trap?
Mobile
Web Service My Server
My Server Web Service
Optical Fibre
Web Service AT&T
Radio Waves
Web Service AT&T
AT&T Web Service
AT&T Web Services
Bigger than mobile?
 
Wifi sucks.
Ofcom study ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Interference sucks.
So how do we fix it?
1. Reduce Requests
AT&T Web Services
Server Web Services AT&T
Reducing requests ,[object Object],[object Object],[object Object],[object Object],[object Object]
2. Shape to packets
Indiana Packet and the Byte of Doom
Packet #1 Payload ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ........................................................... Packet #2 Payload .
1 extra byte means  1 extra packet 1 extra packet
Reduce number of packets
Packet sizes ,[object Object],[object Object],[object Object],[object Object]
Packet Research ,[object Object]
[object Object],[object Object],[object Object],[object Object]
What is YQL?
 
var map = new YMap(document.getElementById('map'));…var currentGeoPoint = new YGeoPoint( _c.Lat, _c.Lon );  map.addMarker(currentGeoPoint);… … if (flickcurl_prepare(fc, "flickr.photos.geo.correctLocation", parameters, count)) { … } … http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Corvette&results=2 http://weather.yahooapis.com/forecastrss?p=FRXX0076&u=c ? ? ? ?
var map = new YMap(document.getElementById('map'));…var currentGeoPoint = new YGeoPoint( _c.Lat, _c.Lon );  map.addMarker(currentGeoPoint);… … if (flickcurl_prepare(fc, "flickr.photos.geo.correctLocation", parameters, count)) { … } … http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Corvette&results=2 http://weather.yahooapis.com/forecastrss?p=FRXX0076&u=c ? ? ? ?
YQL Bindings http://weather.yahooapis.com/forecastrss?p=FRXX0076&u=c … if (flickcurl_prepare(fc, "flickr.photos.geo.correctLocation", parameters, count)) { … } … http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Corvette&results=2 var map = new YMap(document.getElementById('map'));…var currentGeoPoint = new YGeoPoint( _c.Lat, _c.Lon );  map.addMarker(currentGeoPoint);…
YQL ,[object Object],[object Object],[object Object]
YQL is like SQL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Verbs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Demo ,[object Object]
Server Web Services AT&T
YQL Example
select * from flickr.photos.info where photo_id in (select id from flickr.photos.search where query = “lolcats”)
Conclusion ,[object Object],[object Object],[object Object],[object Object]
Application design ,[object Object],[object Object],[object Object],[object Object],[object Object]
ReST ,[object Object],[object Object],[object Object]
follow me on twitter.com/sh 1 mmer ,[object Object],[object Object]

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How to avoid the latency trap and lessons about software design

  • 1. How to avoid the latency trap and lessons about software design
  • 2.
  • 3. What is the latency trap?
  • 5. Web Service My Server
  • 6. My Server Web Service
  • 14.  
  • 16.
  • 18. So how do we fix it?
  • 22.
  • 23. 2. Shape to packets
  • 24. Indiana Packet and the Byte of Doom
  • 25. Packet #1 Payload ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ..................................................................... ........................................................... Packet #2 Payload .
  • 26. 1 extra byte means 1 extra packet 1 extra packet
  • 27. Reduce number of packets
  • 28.
  • 29.
  • 30.
  • 32.  
  • 33. var map = new YMap(document.getElementById('map'));…var currentGeoPoint = new YGeoPoint( _c.Lat, _c.Lon ); map.addMarker(currentGeoPoint);… … if (flickcurl_prepare(fc, "flickr.photos.geo.correctLocation", parameters, count)) { … } … http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Corvette&results=2 http://weather.yahooapis.com/forecastrss?p=FRXX0076&u=c ? ? ? ?
  • 34. var map = new YMap(document.getElementById('map'));…var currentGeoPoint = new YGeoPoint( _c.Lat, _c.Lon ); map.addMarker(currentGeoPoint);… … if (flickcurl_prepare(fc, "flickr.photos.geo.correctLocation", parameters, count)) { … } … http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Corvette&results=2 http://weather.yahooapis.com/forecastrss?p=FRXX0076&u=c ? ? ? ?
  • 35. YQL Bindings http://weather.yahooapis.com/forecastrss?p=FRXX0076&u=c … if (flickcurl_prepare(fc, "flickr.photos.geo.correctLocation", parameters, count)) { … } … http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Corvette&results=2 var map = new YMap(document.getElementById('map'));…var currentGeoPoint = new YGeoPoint( _c.Lat, _c.Lon ); map.addMarker(currentGeoPoint);…
  • 36.
  • 37.
  • 38.
  • 39.
  • 42. select * from flickr.photos.info where photo_id in (select id from flickr.photos.search where query = “lolcats”)
  • 43.
  • 44.
  • 45.
  • 46.

Notas del editor

  1. Lets take an example of a developer trying