class ActionView::Digestor
Attributes
finder[R]
name[R]
options[R]
Public Class Methods
digest(options)
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Supported options:
-
name
- Template name -
finder
- An instance of ActionView::LookupContext -
dependencies
- An array of dependent views -
partial
- Specifies whether the template is a partial
# File lib/action_view/digestor.rb, line 18 def digest(options) options.assert_valid_keys(:name, :finder, :dependencies, :partial) cache_key = ([ options[:name], options[:finder].details_key.hash ].compact + Array.wrap(options[:dependencies])).join('.') # this is a correctly done double-checked locking idiom # (ThreadSafe::Cache's lookups have volatile semantics) @@cache[cache_key] || @@digest_monitor.synchronize do @@cache.fetch(cache_key) do # re-check under lock compute_and_store_digest(cache_key, options) end end end
new(options)
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# File lib/action_view/digestor.rb, line 56 def initialize(options) @name, @finder = options.values_at(:name, :finder) @options = options.except(:name, :finder) end
Private Class Methods
compute_and_store_digest(cache_key, options)
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# File lib/action_view/digestor.rb, line 33 def compute_and_store_digest(cache_key, options) # called under @@digest_monitor lock klass = if options[:partial] || options[:name].include?("/_") # Prevent re-entry or else recursive templates will blow the stack. # There is no need to worry about other threads seeing the +false+ value, # as they will then have to wait for this thread to let go of the @@digest_monitor lock. pre_stored = @@cache.put_if_absent(cache_key, false).nil? # put_if_absent returns nil on insertion PartialDigestor else Digestor end digest = klass.new(options).digest # Store the actual digest if config.cache_template_loading is true @@cache[cache_key] = stored_digest = digest if ActionView::Resolver.caching? digest ensure # something went wrong or ActionView::Resolver.caching? is false, make sure not to corrupt the @@cache @@cache.delete_pair(cache_key, false) if pre_stored && !stored_digest end
Public Instance Methods
dependencies()
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# File lib/action_view/digestor.rb, line 70 def dependencies DependencyTracker.find_dependencies(name, template) rescue ActionView::MissingTemplate logger.try :error, " '#{name}' file doesn't exist, so no dependencies" [] end
digest()
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# File lib/action_view/digestor.rb, line 61 def digest Digest::MD5.hexdigest("#{source}-#{dependency_digest}").tap do |digest| logger.try :debug, " Cache digest for #{template.inspect}: #{digest}" end rescue ActionView::MissingTemplate logger.try :error, " Couldn't find template for digesting: #{name}" '' end
nested_dependencies()
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# File lib/action_view/digestor.rb, line 77 def nested_dependencies dependencies.collect do |dependency| dependencies = PartialDigestor.new(name: dependency, finder: finder).nested_dependencies dependencies.any? ? { dependency => dependencies } : dependency end end
Private Instance Methods
dependency_digest()
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# File lib/action_view/digestor.rb, line 105 def dependency_digest template_digests = dependencies.collect do |template_name| Digestor.digest(name: template_name, finder: finder, partial: true) end (template_digests + injected_dependencies).join("-") end
injected_dependencies()
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# File lib/action_view/digestor.rb, line 113 def injected_dependencies Array.wrap(options[:dependencies]) end
logger()
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# File lib/action_view/digestor.rb, line 85 def logger ActionView::Base.logger end
logical_name()
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# File lib/action_view/digestor.rb, line 89 def logical_name name.gsub(%r|/_|, "/") end
partial?()
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# File lib/action_view/digestor.rb, line 93 def partial? false end
source()
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# File lib/action_view/digestor.rb, line 101 def source template.source end
template()
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# File lib/action_view/digestor.rb, line 97 def template @template ||= finder.disable_cache { finder.find(logical_name, [], partial?) } end