Server push and Comet (Rails user group Hamburg 2009-06-10)

Server Push or „How to initiate client side changes from the server without polling every second or so“ Donnerstag, 11. Juni 2009

Websocket Donnerstag, 11. Juni 2009

HTML5 Donnerstag, 11. Juni 2009

var myWebSocket = new(quot;ws://www.websocket.orgquot;); myWebSocket.onmessage = function(evt) { alert( quot;Received Message: quot; + evt.data); }; Donnerstag, 11. Juni 2009

Can you use it? Donnerstag, 11. Juni 2009

IE6 (released 2001) market share May 09: ~15% Donnerstag, 11. Juni 2009

No! Donnerstag, 11. Juni 2009

Then what? Donnerstag, 11. Juni 2009

Juggernaut Donnerstag, 11. Juni 2009

needs ﬂash Donnerstag, 11. Juni 2009

no thanks Donnerstag, 11. Juni 2009

Comet Donnerstag, 11. Juni 2009

general technique, no implementation Donnerstag, 11. Juni 2009

longer connections Donnerstag, 11. Juni 2009

server and client side components Donnerstag, 11. Juni 2009

server side Donnerstag, 11. Juni 2009

traditionally (think Apache): one thread per connection Donnerstag, 11. Juni 2009

Comet servers reduce server-side resources per connection • Reduce overhead per thread • use event libraries • use microthreads (e.g. Erlang) Donnerstag, 11. Juni 2009

client side Donnerstag, 11. Juni 2009

asynchronous request Donnerstag, 11. Juni 2009

hold it! Donnerstag, 11. Juni 2009

drop connection after receiving something useful Donnerstag, 11. Juni 2009

then reinitiate connection Donnerstag, 11. Juni 2009

still request/reponse Donnerstag, 11. Juni 2009

BUT data ﬂow occurs on the server‘s schedule close approximation of the server → client ﬂow Donnerstag, 11. Juni 2009

Implementations Donnerstag, 11. Juni 2009

Bayeux Donnerstag, 11. Juni 2009

standard protocol Donnerstag, 11. Juni 2009

many servers use it Cometd ErlyComet GlassFish Jetty Orbited Persevere ... Donnerstag, 11. Juni 2009

many client libs use it Dojo (inventor) jQuery GWT ... Donnerstag, 11. Juni 2009

combine any server and js lib Donnerstag, 11. Juni 2009

Jabber Donnerstag, 11. Juni 2009

JS libs available Donnerstag, 11. Juni 2009

mature Server Donnerstag, 11. Juni 2009

scales Donnerstag, 11. Juni 2009

can hold ten thousands connections on a single server Donnerstag, 11. Juni 2009

proprietary solutions Donnerstag, 11. Juni 2009

RMDS2Web Server 500.000 concurrent users on single Dell-server quot;most scalable real-time push web systemquot; commercial Donnerstag, 11. Juni 2009

APE (Ajax Push Engine) quot;Real time data streamingquot; open source client and server proprietary protocol (NOT Bayeux) Donnerstag, 11. Juni 2009

Who is doing it? Donnerstag, 11. Juni 2009

Facebook Meebo (Chat) ... Donnerstag, 11. Juni 2009

That is all! Donnerstag, 11. Juni 2009

Reminder: Rails-Konferenz call for papers deadline: 1st of July Donnerstag, 11. Juni 2009

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Server push and Comet (Rails user group Hamburg 2009-06-10)

by Ralph von der Heyden on Jun 11, 2009

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Server push and Comet (Rails user group Hamburg 2009-06-10) — Presentation Transcript