Add bin and edit workflow

bin/gems/concurrent-ruby-1.3.8/lib/concurrent-ruby/concurrent/settable_struct.rb

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+require 'concurrent/errors'
+require 'concurrent/synchronization/abstract_struct'
+require 'concurrent/synchronization/lockable_object'
+
+module Concurrent
+
+  # An thread-safe, write-once variation of Ruby's standard `Struct`.
+  # Each member can have its value set at most once, either at construction
+  # or any time thereafter. Attempting to assign a value to a member
+  # that has already been set will result in a `Concurrent::ImmutabilityError`.
+  #
+  # @see http://ruby-doc.org/core/Struct.html Ruby standard library `Struct`
+  # @see http://en.wikipedia.org/wiki/Final_(Java) Java `final` keyword
+  module SettableStruct
+    include Synchronization::AbstractStruct
+
+    # @!macro struct_values
+    def values
+      synchronize { ns_values }
+    end
+    alias_method :to_a, :values
+
+    # @!macro struct_values_at
+    def values_at(*indexes)
+      synchronize { ns_values_at(indexes) }
+    end
+
+    # @!macro struct_inspect
+    def inspect
+      synchronize { ns_inspect }
+    end
+    alias_method :to_s, :inspect
+
+    # @!macro struct_merge
+    def merge(other, &block)
+      synchronize { ns_merge(other, &block) }
+    end
+
+    # @!macro struct_to_h
+    def to_h
+      synchronize { ns_to_h }
+    end
+
+    # @!macro struct_get
+    def [](member)
+      synchronize { ns_get(member) }
+    end
+
+    # @!macro struct_equality
+    def ==(other)
+      synchronize { ns_equality(other) }
+    end
+
+    # @!macro struct_each
+    def each(&block)
+      return enum_for(:each) unless block_given?
+      synchronize { ns_each(&block) }
+    end
+
+    # @!macro struct_each_pair
+    def each_pair(&block)
+      return enum_for(:each_pair) unless block_given?
+      synchronize { ns_each_pair(&block) }
+    end
+
+    # @!macro struct_select
+    def select(&block)
+      return enum_for(:select) unless block_given?
+      synchronize { ns_select(&block) }
+    end
+
+    # @!macro struct_set
+    #
+    # @raise [Concurrent::ImmutabilityError] if the given member has already been set
+    def []=(member, value)
+      if member.is_a? Integer
+        length = synchronize { @values.length }
+        if member >= length
+          raise IndexError.new("offset #{member} too large for struct(size:#{length})")
+        end
+        synchronize do
+          unless @values[member].nil?
+            raise Concurrent::ImmutabilityError.new('struct member has already been set')
+          end
+          @values[member] = value
+        end
+      else
+        send("#{member}=", value)
+      end
+    rescue NoMethodError
+      raise NameError.new("no member '#{member}' in struct")
+    end
+
+    private
+
+    # @!visibility private
+    def initialize_copy(original)
+      synchronize do
+        super(original)
+        ns_initialize_copy
+      end
+    end
+
+    # @!macro struct_new
+    def self.new(*args, &block)
+      clazz_name = nil
+      if args.length == 0
+        raise ArgumentError.new('wrong number of arguments (0 for 1+)')
+      elsif args.length > 0 && args.first.is_a?(String)
+        clazz_name = args.shift
+      end
+      FACTORY.define_struct(clazz_name, args, &block)
+    end
+
+    FACTORY = Class.new(Synchronization::LockableObject) do
+      def define_struct(name, members, &block)
+        synchronize do
+          clazz = Synchronization::AbstractStruct.define_struct_class(SettableStruct, Synchronization::LockableObject, name, members, &block)
+          members.each_with_index do |member, index|
+            clazz.send :remove_method, member if clazz.instance_methods.include? member
+            clazz.send(:define_method, member) do
+              synchronize { @values[index] }
+            end
+            clazz.send(:define_method, "#{member}=") do |value|
+              synchronize do
+                unless @values[index].nil?
+                  raise Concurrent::ImmutabilityError.new('struct member has already been set')
+                end
+                @values[index] = value
+              end
+            end
+          end
+          clazz
+        end
+      end
+    end.new
+    private_constant :FACTORY
+  end
+end