Real Time Event Dispatcher

Real Time Event Dispatcher
Pushing symfony events
in real time
to your clients

Imagine Games Remember Google Wave? No? Anyone??? Read/Delete a message, all favicons change Your turn? Instant notification GMail Like „tail –f /var/log/my.log >some.browsers“

IT‘S JUST SOOOO COOL!!! You click somewhere and immediately see a response somewhere else... Real Time Event Dispatcher

@KaroDidi 1 wife, 2 kids, 3 monitors 34 years Day-Job: Working on Excel/Access VBA Applications :-/ True heart belongs to Web and PHP since >10 Years Own company/Freelancer www.smartpixelmedia.de Real-Life? Ah, right... Mountainbike Model plane/heli Peter Dietrich Real Time Event Dispatcher Hobbies: www.karopapier.de www.xosofox.de www.managerator.de www.tmeet.de www.timini.de www.beididi.de www.jobeet.de / www.symfony2.de www.d1d.li

The Big Bicture Some PHP Some data transport Some JS Real Time Event Dispatcher sfBackend APE

Real Time Event Dispatcher lib/model APE Custom Event Handler sfEventHandler Browser Browser Browser Throw Event HTTP Request JSON data Process Event Response on long-polling AJAX request Event bubbling through Browser Tab Browser Tab

Real-Time?? Really really?
Yes, really really! *
Because it is not Polling! Data is being „pushed“!
Real Time Event Dispatcher * Conditions apply: Network latency, Server load, …

Polling?
„ Polling is just reverse Spam“
Real Time Event Dispatcher Alexis Richardson http://www.rabbitmq.com/resources/RabbitMQ_Oxford_Geek_Night.pdf (Slide 23) http://www.ape-project.org/comics/1/Chapter-I-common-let-s-push.html

AJAX Long Polling
POST /longpoll HTTP/1.1
.oO(ZZZZZZ) - Wait for data
Or close, send data, and wait
again
Real Time Event Dispatcher Server Client 25s 25s POST Data Rx Data

Comet Servers
APE (AJAX Push Engine, V2 coming, OSS)
node.js
StreamHub (Community Edition available)
Meteor (OSS)
…
Share your alternatives later?
Real Time Event Dispatcher BTW, your Apache would of course instantly go down...

What is APE?
www.ape-project.org
C, optimised for long-polling
Provides Server and Client JS Framework
Channels to listen on
Internally calls it „pipes“ – public and private (=sent to a channel or send to a „user“)
Real Time Event Dispatcher http://www.xosofox.de/2010/03/playing-with-my-new-pet-ape/

... Some APE specifics
Functionality „by itself“ quite bare
Comes with some modules
Add Server Side JS
getPipeByUser?
You need to define your own user session handling to „send to username“
Real Time Event Dispatcher http://www.xosofox.de/2010/10/ape-user-handling/

Enough! Gimmi code!
Sf Event Dispatcher
Real Time Event Dispatcher Dennis Benkert @denderello #sfLive2010 http://www.slideshare.net/denderello/symfony-live-2010-using-symfony-events-to-create-clean-class-interfaces

... More code
Custom Event Handler
Real Time Event Dispatcher Event Payload Channel Define your payload here!

... Even more Code
Call to inline push on APE
JSON based
Need special commands on the server

… Even more Code Real Time Event Dispatcher Event Payload Channel

Server Side JS
Example of event dispatching
Real Time Event Dispatcher Event Payload Channel

Gimmi JS
Client Side APE_JSF EventHandler

Gimmi JS
Do something
Change favicon
Add/Remove Elements
Redraw Canvas
Add to Log

Some things to consider
Auth*ation
User-Handling, concurrent tabs?
Refresh < -- > Session resume
Channels
Public?
Page-Design
Reloads? => Reconnect => new session
Persistent overlay <div> with iframe?

APE Alternatives?
node.js (bare)
socket.io (tries to find „best“ method, websockets, AJAX, Flash, ...)
RabbitMQ?
JSONRPC
Better ask @old_sound about that
RabbitMQ and APE could work together

Psst... Annoying stuff
APE
APE Protocol takes some time to grasp
Little/confusing docs
Performance
General:
Browser parallel limits
Same origin (APE‘s workaround is *.domain.com)
Iframe
User/session handling

Recap
Nice interaction between sf backend server, Comet server and Client
Interesting, different techniques involved
PHP Backend
JS Server side
JS Client side
Just soo cool – as soon as it works ;-)

Further reading
Ape-project.org
Node.js
RabbitMQ

There‘s one more thing
Questions?
Share your experience
If you like it, keep nagging @KaroDidi to release sfRealTimeEventDispatcherPlugin
Real Time Event Dispatcher ... And please give http://tmeet.de/sflive a try

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Real Time Event Dispatcher

by Peter Dietrich on Mar 04, 2011

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Real Time Event Dispatcher — Presentation Transcript