diff options
Diffstat (limited to 'activesupport/lib/active_support/dependencies.rb')
| -rw-r--r-- | activesupport/lib/active_support/dependencies.rb | 156 |
1 files changed, 102 insertions, 54 deletions
diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb index 93a11d4586..16b726bcba 100644 --- a/activesupport/lib/active_support/dependencies.rb +++ b/activesupport/lib/active_support/dependencies.rb @@ -1,6 +1,6 @@ require 'set' require 'thread' -require 'thread_safe' +require 'concurrent' require 'pathname' require 'active_support/core_ext/module/aliasing' require 'active_support/core_ext/module/attribute_accessors' @@ -12,12 +12,40 @@ require 'active_support/core_ext/kernel/reporting' require 'active_support/core_ext/load_error' require 'active_support/core_ext/name_error' require 'active_support/core_ext/string/starts_ends_with' +require "active_support/dependencies/interlock" require 'active_support/inflector' module ActiveSupport #:nodoc: module Dependencies #:nodoc: extend self + mattr_accessor :interlock + self.interlock = Interlock.new + + # :doc: + + # Execute the supplied block without interference from any + # concurrent loads + def self.run_interlock + Dependencies.interlock.running { yield } + end + + # Execute the supplied block while holding an exclusive lock, + # preventing any other thread from being inside a #run_interlock + # block at the same time + def self.load_interlock + Dependencies.interlock.loading { yield } + end + + # Execute the supplied block while holding an exclusive lock, + # preventing any other thread from being inside a #run_interlock + # block at the same time + def self.unload_interlock + Dependencies.interlock.unloading { yield } + end + + # :nodoc: + # Should we turn on Ruby warnings on the first load of dependent files? mattr_accessor :warnings_on_first_load self.warnings_on_first_load = false @@ -30,6 +58,10 @@ module ActiveSupport #:nodoc: mattr_accessor :loaded self.loaded = Set.new + # Stack of files being loaded. + mattr_accessor :loading + self.loading = [] + # Should we load files or require them? mattr_accessor :mechanism self.mechanism = ENV['NO_RELOAD'] ? :require : :load @@ -124,7 +156,7 @@ module ActiveSupport #:nodoc: # Normalize the list of new constants, and add them to the list we will return new_constants.each do |suffix| - constants << ([namespace, suffix] - ["Object"]).join("::") + constants << ([namespace, suffix] - ["Object"]).join("::".freeze) end end constants @@ -201,7 +233,10 @@ module ActiveSupport #:nodoc: # Object includes this module. module Loadable #:nodoc: def self.exclude_from(base) - base.class_eval { define_method(:load, Kernel.instance_method(:load)) } + base.class_eval do + define_method(:load, Kernel.instance_method(:load)) + private :load + end end def require_or_load(file_name) @@ -237,18 +272,6 @@ module ActiveSupport #:nodoc: raise end - def load(file, wrap = false) - result = false - load_dependency(file) { result = super } - result - end - - def require(file) - result = false - load_dependency(file) { result = super } - result - end - # Mark the given constant as unloadable. Unloadable constants are removed # each time dependencies are cleared. # @@ -265,6 +288,20 @@ module ActiveSupport #:nodoc: def unloadable(const_desc) Dependencies.mark_for_unload const_desc end + + private + + def load(file, wrap = false) + result = false + load_dependency(file) { result = super } + result + end + + def require(file) + result = false + load_dependency(file) { result = super } + result + end end # Exception file-blaming. @@ -316,8 +353,11 @@ module ActiveSupport #:nodoc: def clear log_call - loaded.clear - remove_unloadable_constants! + Dependencies.unload_interlock do + loaded.clear + loading.clear + remove_unloadable_constants! + end end def require_or_load(file_name, const_path = nil) @@ -326,41 +366,49 @@ module ActiveSupport #:nodoc: expanded = File.expand_path(file_name) return if loaded.include?(expanded) - # Record that we've seen this file *before* loading it to avoid an - # infinite loop with mutual dependencies. - loaded << expanded - - begin - if load? - log "loading #{file_name}" + Dependencies.load_interlock do + # Maybe it got loaded while we were waiting for our lock: + return if loaded.include?(expanded) - # Enable warnings if this file has not been loaded before and - # warnings_on_first_load is set. - load_args = ["#{file_name}.rb"] - load_args << const_path unless const_path.nil? + # Record that we've seen this file *before* loading it to avoid an + # infinite loop with mutual dependencies. + loaded << expanded + loading << expanded - if !warnings_on_first_load or history.include?(expanded) - result = load_file(*load_args) + begin + if load? + log "loading #{file_name}" + + # Enable warnings if this file has not been loaded before and + # warnings_on_first_load is set. + load_args = ["#{file_name}.rb"] + load_args << const_path unless const_path.nil? + + if !warnings_on_first_load or history.include?(expanded) + result = load_file(*load_args) + else + enable_warnings { result = load_file(*load_args) } + end else - enable_warnings { result = load_file(*load_args) } + log "requiring #{file_name}" + result = require file_name end - else - log "requiring #{file_name}" - result = require file_name + rescue Exception + loaded.delete expanded + raise + ensure + loading.pop end - rescue Exception - loaded.delete expanded - raise - end - # Record history *after* loading so first load gets warnings. - history << expanded - result + # Record history *after* loading so first load gets warnings. + history << expanded + result + end end # Is the provided constant path defined? def qualified_const_defined?(path) - Object.qualified_const_defined?(path.sub(/^::/, ''), false) + Object.const_defined?(path, false) end # Given +path+, a filesystem path to a ruby file, return an array of @@ -373,13 +421,13 @@ module ActiveSupport #:nodoc: bases.each do |root| expanded_root = File.expand_path(root) - next unless %r{\A#{Regexp.escape(expanded_root)}(/|\\)} =~ expanded_path + next unless expanded_path.start_with?(expanded_root) - nesting = expanded_path[(expanded_root.size)..-1] - nesting = nesting[1..-1] if nesting && nesting[0] == ?/ - next if nesting.blank? + root_size = expanded_root.size + next if expanded_path[root_size] != ?/.freeze - paths << nesting.camelize + nesting = expanded_path[(root_size + 1)..-1] + paths << nesting.camelize unless nesting.blank? end paths.uniq! @@ -388,7 +436,7 @@ module ActiveSupport #:nodoc: # Search for a file in autoload_paths matching the provided suffix. def search_for_file(path_suffix) - path_suffix = path_suffix.sub(/(\.rb)?$/, ".rb") + path_suffix = path_suffix.sub(/(\.rb)?$/, ".rb".freeze) autoload_paths.each do |root| path = File.join(root, path_suffix) @@ -408,7 +456,7 @@ module ActiveSupport #:nodoc: end def load_once_path?(path) - # to_s works around a ruby1.9 issue where String#starts_with?(Pathname) + # to_s works around a ruby issue where String#starts_with?(Pathname) # will raise a TypeError: no implicit conversion of Pathname into String autoload_once_paths.any? { |base| path.starts_with? base.to_s } end @@ -473,9 +521,9 @@ module ActiveSupport #:nodoc: if file_path expanded = File.expand_path(file_path) - expanded.sub!(/\.rb\z/, '') + expanded.sub!(/\.rb\z/, ''.freeze) - if loaded.include?(expanded) + if loading.include?(expanded) raise "Circular dependency detected while autoloading constant #{qualified_name}" else require_or_load(expanded, qualified_name) @@ -537,7 +585,7 @@ module ActiveSupport #:nodoc: class ClassCache def initialize - @store = ThreadSafe::Cache.new + @store = Concurrent::Map.new end def empty? @@ -594,7 +642,7 @@ module ActiveSupport #:nodoc: def autoloaded?(desc) return false if desc.is_a?(Module) && desc.anonymous? name = to_constant_name desc - return false unless qualified_const_defined? name + return false unless qualified_const_defined?(name) return autoloaded_constants.include?(name) end @@ -729,7 +777,7 @@ module ActiveSupport #:nodoc: protected def log_call(*args) if log_activity? - arg_str = args.collect { |arg| arg.inspect } * ', ' + arg_str = args.collect(&:inspect) * ', ' /in `([a-z_\?\!]+)'/ =~ caller(1).first selector = $1 || '<unknown>' log "called #{selector}(#{arg_str})" |