class ActionView::Digestor

Attributes

finder[R]
format[R]
name[R]
options[R]

Public Class Methods

digest(name, format, finder, options = {}) click to toggle source
# File lib/action_view/digestor.rb, line 12
def digest(name, format, finder, options = {})
  cache_key = ([name, format] + 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, name, format, finder, options)
    end
  end
end
new(name, format, finder, options={}) click to toggle source
# File lib/action_view/digestor.rb, line 47
def initialize(name, format, finder, options={})
  @name, @format, @finder, @options = name, format, finder, options
end

Private Class Methods

compute_and_store_digest(cache_key, name, format, finder, options) click to toggle source
# File lib/action_view/digestor.rb, line 24
def compute_and_store_digest(cache_key, name, format, finder, options) # called under @@digest_monitor lock
  klass = if options[:partial] || 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(name, format, finder, 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() click to toggle source
# File lib/action_view/digestor.rb, line 60
def dependencies
  DependencyTracker.find_dependencies(name, template)
rescue ActionView::MissingTemplate
  [] # File doesn't exist, so no dependencies
end
digest() click to toggle source
# File lib/action_view/digestor.rb, line 51
def digest
  Digest::MD5.hexdigest("#{source}-#{dependency_digest}").tap do |digest|
    logger.try :info, "Cache digest for #{name}.#{format}: #{digest}"
  end
rescue ActionView::MissingTemplate
  logger.try :error, "Couldn't find template for digesting: #{name}.#{format}"
  ''
end
nested_dependencies() click to toggle source
# File lib/action_view/digestor.rb, line 66
def nested_dependencies
  dependencies.collect do |dependency|
    dependencies = PartialDigestor.new(dependency, format, finder).nested_dependencies
    dependencies.any? ? { dependency => dependencies } : dependency
  end
end

Private Instance Methods

dependency_digest() click to toggle source
# File lib/action_view/digestor.rb, line 95
def dependency_digest
  template_digests = dependencies.collect do |template_name|
    Digestor.digest(template_name, format, finder, partial: true)
  end

  (template_digests + injected_dependencies).join("-")
end
injected_dependencies() click to toggle source
# File lib/action_view/digestor.rb, line 103
def injected_dependencies
  Array.wrap(options[:dependencies])
end
logger() click to toggle source
# File lib/action_view/digestor.rb, line 75
def logger
  ActionView::Base.logger
end
logical_name() click to toggle source
# File lib/action_view/digestor.rb, line 79
def logical_name
  name.gsub(%r/_|, "/")
end
partial?() click to toggle source
# File lib/action_view/digestor.rb, line 83
def partial?
  false
end
source() click to toggle source
# File lib/action_view/digestor.rb, line 91
def source
  template.source
end
template() click to toggle source
# File lib/action_view/digestor.rb, line 87
def template
  @template ||= finder.find(logical_name, [], partial?, formats: [ format ])
end