Page Caching Resurrected

Page Caching Resurrected Ben Sco eld – Viget Labs

Page Caching Resurrected: A Fairy Tale Ben Sco eld – Viget Labs

three little pigs

page caching

class PigsController caches_page :show def show @pig = Pig.ﬁnd(params[:id]) end def update @pig = Pig.ﬁnd(params[:id]) @pig.update_attributes(params[:pig]) expire_page :action => :show end end

standard 1 page 3000 requests per second

public dynamic content

action caching

class PigsController require_login :show caches_action :show def show @pig = Pig.ﬁnd(params[:id]) end def update @pig = Pig.ﬁnd(params[:id]) @pig.update_attributes(params[:pig]) expire_action :action => :show end end

standard 1 action 500 page 3000 requests per second

dynamic content

fragment caching

<% cache(:key => 'index:piglist') do %> <ul id=quot;pig-listquot;> <% @pigs.each do |pig| %> <li> <%= image_tag pig.house.photo %> <%= h pig.name %> </li> <% end %> </ul> <% end %>

class PigsController # ... def update @pig = Pig.ﬁnd(params[:id]) @pig.update_attributes(params[:pig]) expire_fragment :key => 'index:piglist' end end

standard 1 fragment 20 action 500 page 3000 requests per second

eficiency

the idea

Rails 2.3

hello, metal

class BigBadWolf def self.call(env) if env[quot;PATH_INFOquot;] =~ /^/threaten/ [ 200, {quot;Content-Typequot; => quot;text/htmlquot;}, quot;Little pig, little pig, let me in!quot; ] else [ 404, {quot;Content-Typequot; => quot;text/htmlquot;}, quot;Not Foundquot; ] end end end

high-performance endpoints

javascript

<ul id=quot;logged-out-navquot; class=quot;usernavquot; style=quot;display:nonequot;> <li class=quot;ﬁrst sign-out-linkquot;> <a class=quot;utility-linkquot; href=quot;#quot; id=quot;login-linkquot; onclick=quot;Login.show($('top-login-form')); return false;quot;>Login</a> </li> <li class=quot;signin-border-leftquot;> <a href=quot;/users/forgot_passwordquot; class=quot;utility-linkquot;>Forgot Password?</a> </li> <li class=quot;signin-border-leftquot;> <a href=quot;/signupquot; class=quot;utility-linkquot;>Sign Up</a> </li> </ul>

<ul id=quot;logged-in-navquot; class=quot;usernavquot; style=quot;display:nonequot;> <li id=quot;welcome-usernamequot; class=quot;firstquot;> Welcome </li> <li> <a href=quot;/profilequot; class=quot;utility-linkquot;>Profile</a> </li> <li> <a href=quot;/profile/queuequot; class=quot;utility-linkquot; id=quot;your-queue-linkquot;>Queue</a> </li> <li class=quot;sign-out-linkquot;> <a href=quot;#quot; id=quot;top-nav-sign-outquot; onclick=quot;new Ajax.Request(...)quot;>Sign Out</a> </li> </ul>

<ul id=quot;logged-in-navquot; class=quot;usernavquot; style=quot;display:nonequot;> <li id=quot;welcome-usernamequot; class=quot;firstquot;> Welcome </li> <li> <a href=quot;/profilequot; class=quot;utility-linkquot;>Profile</a> </li> <li> <a href=quot;/profile/queuequot; class=quot;utility-linkquot; id=quot;your-queue-linkquot;>Queue</a> </li> <li class=quot;sign-out-linkquot;> <a href=quot;#quot; id=quot;top-nav-sign-outquot; onclick=quot;new Ajax.Request(...)quot;>Sign Out</a> </li> </ul>

hulu is insane don’t do it like they do

the* right way *a

the standard approach

class ItemsController < ApplicationController def index @user = User.ﬁnd_by_login(params[:user]) @items = Item.released_on(params[:date]) end end

class Item < ActiveRecord::Base has_many :pulls, :dependent => :destroy named_scope :released_on, lambda { |date| date ||= Item.maximum(:released_on) {:conditions => {:released_on => date}, :order => 'name ASC'} } def pulled_by?(user) x = user.nil? ? false : !self.pulls.by_user(user.id).empty? end end

<h1>Releases</h1> <ul> <% @items.each do |item| %> <% content_tag_for :li, item do %> <%= image_tag 'cover.png', :alt => h(item.name), :class => 'cover' %> <%= image_tag('badge.png', :alt => 'pulling',:class => 'badge') if item.pulled_by?(@user) %> <p><%= h item.name %></p> <% end %> <% end %> </ul>

the hybrid approach

class ItemsController < ApplicationController caches_page :index def index @items = Item.released_on(params[:date]).all end end

require(File.dirname(__FILE__) + quot;/../../conﬁg/environmentquot;) unless deﬁned?(Rails) class PullList def self.call(env) if env[quot;PATH_INFOquot;] =~ /^/pulls/ date = '2008-11-05' user = '1' [ 200, {quot;Content-Typequot; => quot;application/javascriptquot;}, [Pull.by_user(user).for_date(date).map {|i| i.item_id}.to_json]] else [404, {quot;Content-Typequot; => quot;text/htmlquot;}, [quot;Not Foundquot;]] end end end

class Pull < ActiveRecord::Base belongs_to :user belongs_to :item named_scope :by_user, lambda { |user_id| {:conditions => {:user_id => user_id}} } named_scope :for_date, lambda { |date| {:include => :item, :conditions => {:items => {:released_on => date}}} } end

$(document).ready(function() { $.getJSON('/pulls', function(data) { $.each(data, function() { $('#item_'+this).addClass('pulled'); }); }); });

standard

hybrid

standard 0.617 hybrid 0.039 0.096 content load time

hybrid approach - version 2

class SessionsController < ApplicationController def new; end def create # ... session[:pulls] = @user.pulls.map {|i| i.item_id} redirect_to items_path end end

require(File.dirname(__FILE__) + quot;/../../conﬁg/environmentquot;) unless deﬁned?(Rails) class PullList def self.call(env) if env[quot;PATH_INFOquot;] =~ /^/pulls/ date = '2008-11-05' user = '1' [ 200, {quot;Content-Typequot; => quot;application/javascriptquot;}, [env['rack.session'][:pulls].to_json] ] else [404, {quot;Content-Typequot; => quot;text/htmlquot;}, [quot;Not Foundquot;]] end end end

hybrid v2

standard 0.617 hybrid 0.039 0.096 hybrid v2 0.043 0.023 content load time

when to use it

when not to use it

accessibility

Thank You ben sco eld - @bsco eld - http://www.viget.com/extend - http://www.speakerrate.com/bsco eld

Page Caching Resurrected

by Ben Scofield on Apr 15, 2009

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Page Caching Resurrected — Presentation Transcript