railswaycon 2009 - summary

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Zusammenfassung der Ruby on Rails Konferenz 2009 in Berlin

Daniel Mattes, 4. Juni 2009

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Über michDaniel Mattes

Angestellter bei der BurdaWireless GmbH

email: dm@actsasblog.dehttp://www.xing.com/profile/Daniel_Mattes2http://www.actsasblog.de

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AgendaAsynchronous Processing in RubyHAML/SASS/COMPASSJRubyRails PerformanceFrontend OptimizationjQuery…others

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Asynchronous Processing in Ruby

Title: The State of Asynchronous Processing in Ruby - Mathias MeyerSlides: http://www.paperplanes.de/2009/5/27/railswaycon_slides.htmlLinks

http://github.com/ezmobius/nanite/tree/masterhttp://www.rabbitmq.com/http://github.com/tobi/delayed_job/tree/master

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Asynchronous Processing in Ruby

When?Requests are taking too longTasks on a certain timeLonger running tasks

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Asynchronous Processing in Ruby

Nanite (the big one) Using RabbitMQScalling

Build in error/exceptions reportsRecommendations

simple delayed_jobs

distributedWhen using EC2 -> Amazon SQS

heavy load, scalableNanite/RabbitMQ

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HAML/SASS/COMPASS

Title: Show the Frontend some Love: HAML and SASS - Jan KrutischSlides: http://www.slideshare.net/jan_mindmatters/haml-sass-and-compassLinks

http://haml.hamptoncatlin.com/http://haml.hamptoncatlin.com/docs/rdoc

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HAML

ERB<div id='content'><div class='left column'>

<h2>Welcome to our site!</h2><p>

<%= print_information %></p>

</div><div class="right column">

<%= render :partial => "sidebar" %></div>

</div>

HAML#content.left.column

%h2 Welcome to our site!%p= print_information

.right.column= render :partial => "sidebar"

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HAML

HAMLoutputs beautiful codegem install hamlautomatically 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 .eachautomated id generation: %li[obj] <li id=obj.id..... / output html commentsyou can migrate your erb step by step

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SASS

SASS!main_bg= #46ar12!main_width= 40em

#main:background-color= !main_bg:width= !main_width.sidebar:background-color= !main_bg +

#333333:width= !main_width - 25em

CSS

#main {background-color: #46a312;width: 40em; }#main .sidebar {background-color: #79d645;width: 15em; }

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SASS

SASSinstallation: its included in hamlyou can create nested stylesyou can create constantscan do calculationsmixins, by using = for definition, + for usageyou 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?performancescalabilityjava api

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Migration to JRuby

Problems:Gems like ferret, file_column take othersolutionsDeployment with Glassfish

Complicatedmuch slower than with mongrel

RecommendationIf you don‘t need to convert your hole app, just build a small application which exposes a rest interface.

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Rails PerformanceTitle: Rails Performance - Michael Koziarskifirst focus to frontend performance

yslow: http://developer.yahoo.com/yslow/javascript_include_tag:defaults, :cache => true

My suggestionhttp://github.com/yolk/rucksack/tree/masterIt‘s a packer like asset_package, asset_compressor

sprite your images: http://websitetips.com/articles/css/sprites/

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Rails Performance1. What is slow?

heavily used? cache

etagslast updated headerExpires header

browser don't look for a specific time

fresh_when

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Rails Performance2. Why is it slow?

performance testsrake test:benchmarkNewRelic RPM: http://www.newrelic.com/Fiveruns Tuneup: http://www.fiveruns.com/http://github.com/dsboulder/query_reviewer/tree/master

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Rails Performance3. Improve it

often used image create image tag manuallylook at url generatorslook at garbage collection

RUBY_HEAP_MIN_SLOTS RUBY_GC_MALLOC_LIMITRUBY_HEAP_FREE_MIN

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Rails PerformanceAt least…

you can start to cache, scale, dbpartitioning,…http://railslab.newrelic.com/scaling-rails

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Frontend Optimazation

Title: Boost your Website's Performance with Frontend Optimization - Ralph von der HeydenSlides: 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 timeFrontend: 90 % loading timeWho?

Fewer RequestsSmaller RequestsSpeed up Requests

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Frontend Optimazation

Fewer requestsJoin CSS/JavascriptsSprite imagesexpires header

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Frontend Optimazation

Smaller requestsgzip your text

Apache: mod_deflateminify js and cssimages

png is usually smaller than gifstrip JPG meta datahttp://smush.it/

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Frontend Optimazation

Speed up requestsmost browsers load 2 files per hostMultiple domains for static contentRails: Set 4 asset hosts 8 parallel downloadsconfig.action_controller.asset_host = „http://assets%d.foobar.com“

Content Delivery Networks for static files

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Frontend Optimazation

Tools?FirebugYSlow

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jQuery

Title: jQuery with Rails - Yehuda KatzSlides: http://yehudakatz.com/wp-content/uploads/2009/05/jquerytutorial.pdfLinks

http://docs.jquery.com/Main_PageWhy?

Write less, do more!Separation of JavaScript and HTMLA lot of plugins

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jQuery

Observer$(“h1”).click(function() {

$(this).fadeIn();});

Selectors#id, element, .class, class.classparent, 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() { ... })

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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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OthersRuby sittin on the Couch - Alexander Lang

http://www.slideshare.net/langalex/ruby-sittin-on-the-couch

it uses javascriptrestful http interfaceit scales

optimistic lockingreplication

written in erlang it saves json

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OthersFrom Rails to Rack: Making Rails 3 a better Ruby Citizen - Yehuda Katz

http://pivotallabs.com/users/woosley/blog/articles/878-from-rails-to-rack-making-rails-3-a-better-ruby-citizen-yehuda-katz-Features

Middlewarerack-testsdifferent ORMs (ActiveRecord, DataMapper,…)Javascript no more Prototype-specefic (jQuery, Mootools,…)faster Filters and Controllers

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OthersRuby/Rails in the Enterprise - MaikSchmidt

xmluse libxml for xml operations

implemented in c very fast you can validate by schema

internationalization

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...rescue TimeLimitExceeded

puts "...habe fertig!"puts "danke ;-)"

end