The document summarizes the agenda and topics covered at the RailsWayCon 2009 conference in Berlin. The conference included sessions on asynchronous processing in Ruby, HAML/SASS templating, migrating to JRuby, Rails performance optimization, frontend optimization with jQuery, and other topics. Speakers discussed using tools like RabbitMQ for asynchronous jobs, HAML for cleaner markup, SASS for CSS frameworks, and jQuery for interactive JavaScript.

1. begin
RailsWayCon.new
...
Zusammenfassung der Ruby on Rails
Konferenz 2009 in Berlin
Daniel Mattes, 4. Juni 2009

2. Über mich
Daniel Mattes
Angestellter bei der BurdaWireless GmbH
email: dm@actsasblog.de
http://www.xing.com/profile/Daniel_Mattes2
http://www.actsasblog.de
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3. Agenda
Asynchronous Processing in Ruby
HAML/SASS/COMPASS
JRuby
Rails Performance
Frontend Optimization
jQuery
…others
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4. Asynchronous Processing in Ruby
Title: The State of Asynchronous
Processing in Ruby - Mathias Meyer
Slides:
http://www.paperplanes.de/2009/5/27/rails
waycon_slides.html
Links
http://github.com/ezmobius/nanite/tree/master
http://www.rabbitmq.com/
http://github.com/tobi/delayed_job/tree/master
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5. Asynchronous Processing in Ruby
When?
Requests are taking too long
Tasks on a certain time
Longer running tasks
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6. Asynchronous Processing in Ruby
Nanite (the big one)
Using RabbitMQ
Scalling
Build in error/exceptions reports
Recommendations
simple
delayed_jobs
distributed
When using EC2 -> Amazon SQS
heavy load, scalable
Nanite/RabbitMQ
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7. HAML/SASS/COMPASS
Title: Show the Frontend some Love:
HAML and SASS - Jan Krutisch
Slides:
http://www.slideshare.net/jan_mindmatters
/haml-sass-and-compass
Links
http://haml.hamptoncatlin.com/
http://haml.hamptoncatlin.com/docs/rdoc
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8. HAML
ERB HAML
<div id='content'> #content
<div class='left column'> .left.column
<h2>Welcome to our %h2 Welcome to our site!
site!</h2> %p= print_information
<p> .right.column= render
<%= print_information %> :partial => quot;sidebarquot;
</p>
</div>
<div class=quot;right columnquot;>
<%= render :partial =>
quot;sidebarquot; %>
</div>
</div>
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9. HAML
HAML
outputs beautiful code
gem install haml
automatically creates self-closing tags for img, br,...
attributes
ruby hash syntax: %head{ :language => 'german'}
& html_escape
can be set as default
== interpolates ruby strings
-= don't output, e. g. for .each
automated id generation: %li[obj] <li id=obj.id.....
/ output html comments
you can migrate your erb step by step
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10. SASS
SASS CSS
!main_bg= #46ar12
!main_width= 40em #main {
background-color: #46a312;
#main width: 40em; }
:background-color= !main_bg #main .sidebar {
:width= !main_width background-color: #79d645;
.sidebar width: 15em; }
:background-color= !main_bg +
#333333
:width= !main_width - 25em
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11. SASS
SASS
installation: its included in haml
you can create nested styles
you can create constants
can do calculations
mixins, by using = for definition, + for usage
you can use loops
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12. COMPASS
COMPASS = CSS-Framework
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13. Migration to JRuby
Title: The Pleasure and Pain of Migrating
to jRuby - Steven Bristol
Why switch?
performance
scalability
java api
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14. Migration to JRuby
Problems:
Gems like ferret, file_column take other
solutions
Deployment with Glassfish
Complicated
much slower than with mongrel
Recommendation
If you don‘t need to convert your hole app,
just build a small application which exposes a
rest interface.
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15. Rails Performance
Title: Rails Performance - Michael
Koziarski
first focus to frontend performance
yslow: http://developer.yahoo.com/yslow/
javascript_include_tag:defaults, :cache =>
true
My suggestion
http://github.com/yolk/rucksack/tree/master
It‘s a packer like asset_package, asset_compressor
sprite your images:
http://websitetips.com/articles/css/sprites/
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16. Rails Performance
1. What is slow?
heavily used?
cache
etags
last updated header
Expires header
browser don't look for a specific time
fresh_when
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17. Rails Performance
2. Why is it slow?
performance tests
rake test:benchmark
NewRelic RPM: http://www.newrelic.com/
Fiveruns Tuneup: http://www.fiveruns.com/
http://github.com/dsboulder/query_reviewer/tree/m
aster
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18. Rails Performance
3. Improve it
often used image create image tag
manually
look at url generators
look at garbage collection
RUBY_HEAP_MIN_SLOTS
RUBY_GC_MALLOC_LIMIT
RUBY_HEAP_FREE_MIN
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19. Rails Performance
At least…
you can start to cache, scale, db
partitioning,…
http://railslab.newrelic.com/scaling-rails
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20. Frontend Optimazation
Title: Boost your Website's Performance
with Frontend Optimization - Ralph von
der Heyden
Slides:
http://www.slideshare.net/ralphvdh/front-
end-performance-railswaycon-2009-short-
talk
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21. Frontend Optimazation
Why?
e. g. Amazon sells 1% less stuff per 100ms
more loading time
Backend: 10 % loading time
Frontend: 90 % loading time
Who?
Fewer Requests
Smaller Requests
Speed up Requests
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22. Frontend Optimazation
Fewer requests
Join CSS/Javascripts
Sprite images
expires header
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23. Frontend Optimazation
Smaller requests
gzip your text
Apache: mod_deflate
minify js and css
images
png is usually smaller than gif
strip JPG meta data
http://smush.it/
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24. Frontend Optimazation
Speed up requests
most browsers load 2 files per host
Multiple domains for static content
Rails: Set 4 asset hosts 8 parallel
downloads
config.action_controller.asset_host =
„http://assets%d.foobar.com“
Content Delivery Networks for static files
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25. Frontend Optimazation
Tools?
Firebug
YSlow
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26. jQuery
Title: jQuery with Rails - Yehuda Katz
Slides: http://yehudakatz.com/wp-
content/uploads/2009/05/jquerytutorial.pdf
Links
http://docs.jquery.com/Main_Page
Why?
Write less, do more!
Separation of JavaScript and HTML
A lot of plugins
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27. jQuery
Observer
$(“h1”).click(function() {
$(this).fadeIn();
});
Selectors
#id, element, .class, class.class
parent, child, prev, next
:first, :last, :not(..)
[attribute=value]
$(quot;input[name='newsletter']quot;).next().text(quot; is
newsletterquot;);
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28. jQuery
Traversal
$(“div”).attr(“id”, “hello”)
$(“div”).removeAttr(“id”);
$(“div”).addClass(“foo”)
$(“div”).toggleClass(“foo”)
$(“div”).html(“<p>Hello</p>”)
Manipulation
$(“div”).append(“<p>Hello</p>”)
$(“<p>Hello</p>”).insertAfter(“div”)
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29. jQuery
$(document).ready(function() { ... })
$(“div”).bind(“click”, function() { ... })
Alias: $(“div”).click(function() { ... })
$(“div”).hover(function() { ... }, function() { ... })
$(“div”).toggle(function() { ... }, function() { ... })
$(“div”).live(“click”, function() { ... })
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30. jQuery
$(“div”).fadeIn()
$(“div”).fadeOut(“slow”)
$(“div”).slideUp(200)
$(“div”).slideDown(“slow”)
$(“div”).animate({height: “toggle”, opacity:
“toggle”})
$(“div”).animate({fontSize: “24px”, opacity:
0.5}, {easing: “expo”})
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31. Others
Ruby sittin on the Couch - Alexander Lang
http://www.slideshare.net/langalex/ruby-sittin-
on-the-couch
it uses javascript
restful http interface
it scales
optimistic locking
replication
written in erlang
it saves json
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32. Others
From Rails to Rack: Making Rails 3 a
better Ruby Citizen - Yehuda Katz
http://pivotallabs.com/users/woosley/blog/artic
les/878-from-rails-to-rack-making-rails-3-a-
better-ruby-citizen-yehuda-katz-
Features
Middleware
rack-tests
different ORMs (ActiveRecord, DataMapper,…)
Javascript no more Prototype-specefic (jQuery,
Mootools,…)
faster Filters and Controllers
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33. Others
Ruby/Rails in the Enterprise - Maik
Schmidt
xml
use libxml for xml operations
implemented in c
very fast
you can validate by schema
internationalization
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34. ...
rescue TimeLimitExceeded
puts quot;...habe fertig!quot;
puts quot;danke ;-)quot;
end
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