Merb Day Keynote

1. Merb 2.0 The long march into the future

2. Core Merb Principles

3. In Depth

4. Performance

5. Requests Per Second

6. Thin Mongrel

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

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

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

10. Thin Mongrel

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

12. Thin Mongrel

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

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

15. Thin Mongrel

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

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

18. Close to the metal as possible

19. Close to the metal as you want

20. Performance Testing

21. KCacheGrind

22. use Merb::Rack::Proﬁle

23. proﬁle/url/callgrind.out.time

24. 5% or greater

25. 10% or greater

26. 10% or greater Merb::RenderMixin::_get_layout 10.05 %

27. Mini-demo

28. Concurrency

29. 20 16 12 8 4 0 1 2 4 8 16 32 Ideal concurrency curve

30. 1 request in 16ms (16ms/req)

31. 2 requests in 16ms (8ms/req)

35. 32 requests in 16ms (2req/ms)

36. 20 16 12 8 4 0 1 2 4 8 16 32 Ideal concurrency curve

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

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

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

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

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

42. 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)

43. 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)

44. Threadsafety

45. Merb::Conﬁg[:use_mutex]

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

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

48. Shared state hurts puppies

49. Solutions

50. Thread-local

51. 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

52. Using a Hash across threads

53. Hash {:x => 5}

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

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

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

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

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

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

61. Mutex

62. Hash {:x => 5}

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

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

66. Hash {:x => 5}

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

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

70. Mutexes make non-atomic operations atomic

71. Modularity

72. 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

75. 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

77. 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

78. @overridable

79. # 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

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

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

82. 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

83. 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

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

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

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

87. 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

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

89. >> 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]]

96. 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

97. Templates

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

99. 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

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

101. Quick demo

102. Good Ruby citizen

103. Rubygems

104. Rubygems :(

105. Rubygems -- but getting :)

106. Working with community == helping the community

107. Rack

108. Rack middleware

109. Where is this going?

110. Apps as a ﬁrst-class concept

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

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

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

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

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

116. Admin Application/Framework

117. CMS Application

118. DB Admin Application

119. Slices on Steroids

120. Resources as a ﬁrst-class concept

121. 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

123. Why?

124. DRYing up common idioms

125. Increasing ﬂexibility (where needed)

126. Core principle: Simple cases can’t get harder

127. Further improve merb server

128. Short term

129. Long term

130. Dynamic worker pools

131. Remove need for nginx

132. Self-managing cluster

133. Additional modules

134. i18n

135. l10n

136. Feed syndication

137. Flat pages

138. More powerful router

139. Router directly to a view

140. even better resource()

141. Framework for OSS Apps

142. Authentication

143. User Management

144. Authorization

145. Note: Communication primitives

146. Tailored stacks

147. Designers

148. Web shops

Merb Day Keynote

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