Module: FiniteMachine::Threadable::ClassMethods

Includes:
InstanceMethods
Defined in:
lib/finite_machine/threadable.rb

Instance Method Summary collapse

Methods included from InstanceMethods

#sync_exclusive, #sync_shared

Instance Method Details

#attr_threadsafe(*attrs) ⇒ nil

Defines threadsafe attributes for a class

Examples:

attr_threadable :errors, :events
attr_threadable :errors, default: []

Returns:

  • (nil) 


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# File 'lib/finite_machine/threadable.rb', line 56

def attr_threadsafe(*attrs)
  opts    = attrs.last.is_a?(::Hash) ? attrs.pop : {}
  default = opts.fetch(:default, nil)
  attrs.flatten.each do |attr|
    class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
      def #{attr}(*args)
        value = args.shift
        if value
          self.#{attr} = value
        elsif instance_variables.include?(:@#{attr})
          sync_shared { @#{attr} }
        elsif #{!default.nil?}
          sync_shared { instance_variable_set(:@#{attr}, #{default}) }
        end
      end
      alias_method '#{attr}?', '#{attr}'

      def #{attr}=(value)
        sync_exclusive { @#{attr} = value }
      end
    RUBY_EVAL
  end
end