Module ThreadLocalAccessors
In: lib/tlattr_accessors.rb

Methods

tlattr_accessor  

Public Instance methods

tlattr_accessor(*names)

Creates thread-local accessors for the given attribute name.

Example:

  tlattr_accessor :my_attr, :another_attr

Default values

You can make the attribute inherit the first value that was set on it in any thread: 

  tlattr_accessor :my_attr, true

  def initialize
    self.my_attr = "foo"
    Thread.new do
       puts self.my_attr # => "foo" (instead of nil)
    end.join
  end

[Source]

    # File lib/tlattr_accessors.rb, line 21
21:   def tlattr_accessor(*names)
22:     first_is_default = names.pop if [true, false].include?(names.last)
23:     names.each do |name|
24:       ivar = "@_tlattr_#{name}"
25:       class_eval %Q{
26:         def #{name}
27:           if #{ivar}
28:             #{ivar}[Thread.current.object_id]
29:           else
30:             nil
31:           end
32:         end
33: 
34:         def #{name}=(val)
35:           #{ivar} = Hash.new #{'{|h, k| h[k] = val}' if first_is_default} unless #{ivar}
36:           thread_id = Thread.current.object_id
37:           unless #{ivar}.has_key?(thread_id)
38:             ObjectSpace.define_finalizer(Thread.current, lambda { #{ivar}.delete(thread_id) })
39:           end
40:           #{ivar}[thread_id] = val
41:         end
42:       }, __FILE__, __LINE__
43:     end
44:   end

[Validate]