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Comet in VIVOTEK
Network Camera
Kent Chen (Kaie)
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Kent Chen (Kaie)
chenkaie@gmail.com
http://chenkaie.blogspot.com
@chenkaie on GitHub
@chenkaie on SlideShare
@chenkaie on LinkedIn
@chenkaie on Twitter
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Problem?
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Server side (Network Camera)
Data SYNC
Client side (Browser)
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Real-Time (more responsive)
Requirement.
e.g., DO status, Audio volume, ...
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Solutions!
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Polling
Sucks
Old school
Not fashion
Another CGI attacks …XD
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Long Polling
Infeasible on embedded Linux
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WebSocket
IE Sux
Browser compatible issue
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Hidden IFrame Technique
Browser busy loading state
always (bad UX)
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Comet
Long-held HTTP connection
Lower overhead
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Comet
on
M$ IE
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Hidden IFrame via HTMLFile ActiveX Object
Client side
Server side
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Comet
on
non-M$ IE
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XMLHTTPRequest Interactive State
Server side
Client
side
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Reference
What else is burried down in the depth’s of Google’s amazing
JavaScript?
Comet：基于 HTTP 长连接的“服务器推”技术
Browser 與 Server 持續同步的作法介紹 (Polling, Comet,
Long Polling, WebSocket)
Comet Programming: the Hidden IFrame Technique
HTTP Streaming
Meteor
Comet: Low Latency Data for the Browser