Merb Day Keynote

Merb 2.0 The long march into the future

Core Merb Principles

In Depth

Performance

Requests Per Second

Thin Mongrel

run proc do |env| [ 200, {quot;Content-Typequot; => quot;text/htmlquot;}, quot;Hello from rackquot; ] end

class QuickApp def call(env) [ 200, {quot;Content-Typequot; => quot;text/htmlquot;}, quot;Hello from rackquot; ] end end run QuickApp.new

Thin Mongrel

match(quot;/routerquot;).defer_to do |req, res| [ 200, {quot;Content-Typequot; => quot;text/htmlquot;}, quot;Helloquot; ] end

Thin Mongrel

class MyApp < Application def string quot;Stringquot; end end

Thin Mongrel

class MyApp < Application def index render end def string quot;Stringquot; end end

Close to the metal as possible

Close to the metal as you want

Performance Testing

KCacheGrind

use Merb::Rack::Proﬁle

proﬁle/url/callgrind.out.time

5% or greater

10% or greater

10% or greater Merb::RenderMixin::_get_layout 10.05 %

Mini-demo

Concurrency

20 16 12 8 4 0 1 2 4 8 16 32 Ideal concurrency curve

1 request in 16ms (16ms/req)

2 requests in 16ms (8ms/req)

32 requests in 16ms (2req/ms)

20 16 12 8 4 0 1 2 4 8 16 32 Ideal concurrency curve

Chart 10 15.00 11.25 7.50 3.75 0 1 2 4 8 16 32 Merb MRI concurrency curve

Chart 12 15.00 11.25 7.50 3.75 0 1 2 4 8 16 32 Merb JRuby (Mongrel) concurrency curve

Chart 13 15.00 11.25 7.50 3.75 0 1 2 4 8 16 32 64 128 256 Merb Glassﬁsh concurrency curve

Chart 13 15.00 11.25 7.50 3.75 0 1 2 4 8 16 32 64 128 256 Not ideal

Chart 13 15.00 11.25 7.50 3.75 0 1 2 4 8 16 32 64 128 256 Not ideal (but it works)

Threadsafety

Merb::Conﬁg[:use_mutex]

class User cattr_accessor :current end class Foo < Merb::Controller before do User.current = session.user end end

class User cattr_accessor :current end class Foo < FAIL Merb::Controller before do User.current = session.user end end

Shared state hurts puppies

Solutions

Thread-local

class User def self.current=(user) Thread.current[:user] = user end def self.current Thread.current[:user] end end class Foo < Merb::Controller before do User.current = session.user end end

Using a Hash across threads

Hash {:x => 5}

Hash {:x => 5} Thread 1 Thread 2

Hash {:x => 5} Thread 1 Thread 2 Read x

Hash {:x => 5} Thread 1 Thread 2 Read x Write x=”1”

Hash {:x => 5} Thread 1 Thread 2 Read x Write x=”1” clear x

Hash {:x => 5} Thread 1 Thread 2 Read x Write x=”1” clear x is there an x?

Hash {:x => 5} Thread 1 Thread 2 Read x Write x=”1” clear x is there an x? no? return nil x=1

Hash {:x => 5}

Hash {:x => 5} Thread 1 Thread 2 Read x is there an x? yes? return 5

Hash {:x => 5} Thread 1 Thread 2 Read x Write x=”1” clear x is there an x? yes? return 5 x=1

Hash {:x => 5}

Hash {:x => 5} Thread 1 Thread 2 Write x=”1” clear x x=1

Hash {:x => 5} Thread 1 Thread 2 Read x Write x=”1” clear x is there an x? yes? return 1 x=1

Mutexes make non-atomic operations atomic

Modularity

merb_gems_version = quot;1.0.4quot; dm_gems_version = quot;0.9.7quot; dependency quot;merb-action-argsquot;, merb_gems_version dependency quot;merb-assetsquot;, merb_gems_version dependency quot;merb-cachequot;, merb_gems_version dependency quot;merb-helpersquot;, merb_gems_version dependency quot;merb-mailerquot;, merb_gems_version dependency quot;merb-slicesquot;, merb_gems_version dependency quot;merb-auth-corequot;, merb_gems_version dependency quot;merb-auth-morequot;, merb_gems_version dependency quot;merb-auth-slice-passwordquot;, merb_gems_version dependency quot;merb-param-protectionquot;, merb_gems_version dependency quot;merb-exceptionsquot;, merb_gems_version dependency quot;dm-corequot;, dm_gems_version dependency quot;dm-aggregatesquot;, dm_gems_version dependency quot;dm-migrationsquot;, dm_gems_version dependency quot;dm-timestampsquot;, dm_gems_version dependency quot;dm-typesquot;, dm_gems_version dependency quot;dm-validationsquot;, dm_gems_version

merb_gems_version = quot;1.0.4quot; dm_gems_version = quot;0.9.7quot; dependency quot;merb-action-argsquot;, merb_gems_version dependency quot;merb-assetsquot;, merb_gems_version dependency quot;merb-cachequot;, merb_gems_version dependency quot;merb-helpersquot;, merb_gems_version dependency quot;merb-mailerquot;, merb_gems_version dependency dependency quot;merb-slicesquot;, merb_gems_version 1 .1.4 quot;merb-auth-corequot;, merb_gems_version dependency uby quot;merb-auth-morequot;, merb_gems_version dependency dependency J R quot;merb-auth-slice-passwordquot;, merb_gems_version quot;merb-param-protectionquot;, merb_gems_version dependency quot;merb-exceptionsquot;, merb_gems_version dependency quot;dm-corequot;, dm_gems_version dependency quot;dm-aggregatesquot;, dm_gems_version dependency quot;dm-migrationsquot;, dm_gems_version dependency quot;dm-timestampsquot;, dm_gems_version dependency quot;dm-typesquot;, dm_gems_version dependency quot;dm-validationsquot;, dm_gems_version

merb_gems_version = quot;1.0.4quot; dm_gems_version = quot;0.9.7quot; dependency quot;merb-action-argsquot;, merb_gems_version dependency quot;merb-assetsquot;, merb_gems_version dependency quot;merb-cachequot;, merb_gems_version dependency quot;merb-helpersquot;, merb_gems_version dependency quot;merb-mailerquot;, merb_gems_version dependency quot;merb-slicesquot;, merb_gems_version dependency quot;merb-auth-corequot;, merb_gems_version dependency quot;merb-auth-morequot;, merb_gems_version dependency quot;merb-auth-slice-passwordquot;, merb_gems_version dependency quot;merb-param-protectionquot;, merb_gems_version dependency quot;merb-exceptionsquot;, merb_gems_version dependency quot;dm-corequot;, dm_gems_version dependency quot;dm-aggregatesquot;, dm_gems_version dependency quot;dm-migrationsquot;, dm_gems_version dependency quot;dm-timestampsquot;, dm_gems_version dependency quot;dm-typesquot;, dm_gems_version dependency quot;dm-validationsquot;, dm_gems_version

merb_gems_version = quot;1.0.4quot; dm_gems_version = quot;0.9.7quot; dependency quot;merb-action-argsquot;, merb_gems_version dependency quot;merb-assetsquot;, merb_gems_version dependency quot;merb-cachequot;, merb_gems_version dependency quot;merb-helpersquot;, merb_gems_version dependency quot;merb-mailerquot;, merb_gems_version dependency .5+ quot;merb-slicesquot;, merb_gems_version dependency 1 .1 quot;merb-auth-corequot;, merb_gems_version dependency dependency by quot;merb-auth-morequot;, merb_gems_version Ru quot;merb-auth-slice-passwordquot;, merb_gems_version dependency J quot;merb-param-protectionquot;, merb_gems_version dependency quot;merb-exceptionsquot;, merb_gems_version dependency quot;dm-corequot;, dm_gems_version dependency quot;dm-aggregatesquot;, dm_gems_version dependency quot;dm-migrationsquot;, dm_gems_version dependency quot;dm-timestampsquot;, dm_gems_version dependency quot;dm-typesquot;, dm_gems_version dependency quot;dm-validationsquot;, dm_gems_version

@overridable

# This is a stub method so plugins can # implement param filtering if they want. # # ==== Parameters # params<Hash{Symbol => String}>:: # A list of params # # ==== Returns # Hash{Symbol => String}:: # A new list of params, filtered as desired # # :api: plugin # @overridable def self._filter_params(params) params end

class Articles < Application params_accessible :article => [:title, :body] end

class Articles < Application def self._filter_params(params) # deep_clone ret = Marshal.load(Marshal.dump(params)) ret[:post].reject! do |k,v| !k.in?(:title, :body) end end end

# :api: public # @overridable def _template_location(ctx, type, ctrlr) _conditionally_append_extension( ctrlr ? quot;#{ctrlr}/#{ctx}quot; : quot;#{ctx}quot;, type) end

class Articles < Application def self._template_location( ctx, type, ctrlr) quot;#{ctrlr}.#{ctx}.#{type}quot; end end

class Articles < Application def self._template_location( t” ay ctx, type, ctrlr) l ou r= “ ro lle nt quot;#{ctrlr}.#{ctx}.#{type}quot; co end end

class Articles < Application self.template_roots = [ [ Merb.root / quot;appquot; / quot;viewsquot;, :_template_location ], [ Merb.root / quot;my_viewsquot;, :_my_template_location ] ] end

>> MerbAuthSlicePassword::Sessions.template_roots #=> [[quot;/Users/wycats/Code/wycats/test/awesome/app/ viewsquot;, :_template_location], [quot;/Library/Ruby/Gems/1.8/gems/ merb-auth-slice-password-1.0.4/app/ viewsquot;, :_slice_template_location], [quot;/Users/wycats/Code/wycats/ test/awesome/slices/merb-auth-slice-password/app/ viewsquot;, :_slice_template_location]]

def _slice_template_location(ctx, type, ctrlr) if ctrlr && ctrlr.include?('/') # skip first segment if given (which is the module name) segments = ctrlr.split('/') quot;#{segments[1,segments.length-1].join('/')}/#{ctx}.#{type}quot; else # default template location logic _template_location(ctx, type, ctrlr) end end

Templates

def load_template_io(path) file = Dir[ quot;#{path}.{#{template_extensions.join(',')}}quot; ].first File.open(file, quot;rquot;) if file end

def load_template_io(path) templates = { Merb.root / quot;appquot; / quot;viewsquot; / quot;template_ioquot; / quot;index.html.erbquot; => quot;Hello worldquot;, Merb.root / quot;appquot; / quot;viewsquot; / quot;template_ioquot; / quot;two.html.erbquot; => quot;Twoquot; } if templates[path + quot;.erbquot;] VirtualFile.new(templates[path + quot;.erbquot;], path + quot;.erbquot;) else file = Dir[ quot;#{path}.{#{template_extensions.join(',')}}quot; ].first File.open(file, quot;rquot;) if file end end

Merb::Router.prepare {default_routes} class TemplateIo < Merb::Controller def index render end def two render end end

Quick demo

Good Ruby citizen

Rubygems

Rubygems :(

Rubygems -- but getting :)

Working with community == helping the community

Rack middleware

Where is this going?

Apps as a ﬁrst-class concept

module MyApp class TemplateIo < Application def index render end def two render end end end

module MyApp class TemplateIo < Application def index render MyApp::Application end def two render end end end

module MyApp extend Merb::App mount ::Blog, :at => quot;/blogquot; Config[:framework] = flat end

Blog::Config[:log_delimiter] = quot;BLOG: quot;

Admin Application/Framework

CMS Application

DB Admin Application

Slices on Steroids

Resources as a ﬁrst-class concept

module MyApp class Resource < Merb::Resource def list(klass) klass.all end def get(klass, ids) klass.get(ids) end def authorized?(namespace, *args) user == quot;wycatsquot; end def user request.session.user end end end

DRYing up common idioms

Increasing ﬂexibility (where needed)

Core principle: Simple cases can’t get harder

Further improve merb server

Short term

Long term

Dynamic worker pools

Remove need for nginx

Self-managing cluster

Additional modules

Feed syndication

Flat pages

More powerful router

Router directly to a view

even better resource()

Framework for OSS Apps

Authentication

User Management

Authorization

Note: Communication primitives

Tailored stacks

Designers

Web shops

http://merbist.com	294
http://www.merboverheard.com	15
http://merboverheard.com	11
http://static.slideshare.net	6
http://www.hanrss.com	2
applewebdata://E3194B7C-D4E2-48D9-B912-B77781163DAC	1
http://www.linkedin.com	1

Merb Day Keynote

by Yehuda Katz

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Merb Day Keynote Presentation Transcript