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

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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Agenda
Asynchronous Processing in Ruby
HAML/SASS/COMPASS
JRuby
Rails Performance
Frontend Optimization
jQuery
…others
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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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Asynchronous Processing in Ruby
When?
Requests are taking too long
Tasks on a certain time
Longer running tasks
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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
04.06.2009 RailsWayCon 2009 6

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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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 => \"sidebar\"
</p>
</div>
<div class=\"right column\">
<%= render :partial =>
\"sidebar\" %>
</div>
</div>
04.06.2009 RailsWayCon 2009 8

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
04.06.2009 RailsWayCon 2009 9

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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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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COMPASS
COMPASS = CSS-Framework
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Migration to JRuby
Title: The Pleasure and Pain of Migrating
to jRuby - Steven Bristol
Why switch?
performance
scalability
java api
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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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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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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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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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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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Rails Performance
At least…
you can start to cache, scale, db
partitioning,…
http://railslab.newrelic.com/scaling-rails
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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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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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Frontend Optimazation
Fewer requests
Join CSS/Javascripts
Sprite images
expires header
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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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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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Frontend Optimazation
Tools?
Firebug
YSlow
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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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jQuery
Observer
$(“h1”).click(function() {
$(this).fadeIn();
});
Selectors
#id, element, .class, class.class
parent, child, prev, next
:first, :last, :not(..)
[attribute=value]
$(\"input[name='newsletter']\").next().text(\" is
newsletter\");
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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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jQuery
$(document).ready(function() { ... })
$(“div”).bind(“click”, function() { ... })
Alias: $(“div”).click(function() { ... })
$(“div”).hover(function() { ... }, function() { ... })
$(“div”).toggle(function() { ... }, function() { ... })
$(“div”).live(“click”, function() { ... })
04.06.2009 RailsWayCon 2009 29

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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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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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
04.06.2009 RailsWayCon 2009 32

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
04.06.2009 RailsWayCon 2009 33

...
rescue TimeLimitExceeded
puts \"...habe fertig!\"
puts \"danke ;-)\"
end
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