Method: ASIR::ThreadVariable::ModuleMethods#mattr_getter_thread

Defined in:
lib/asir/thread_variable.rb

#mattr_getter_thread(*names) ⇒ Object Also known as: cattr_getter_thread

Defines a class attribute getter stored in Thread.current.

Options:

:initialize -- String: expression to initialize the variable is undefined.
:default    -- String: expression to return if the variable value if undefined.
:transform  -- String: expression to transform the __val variable before returning.

Also defines clear_NAME method that undefines the thread variable.



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# File 'lib/asir/thread_variable.rb', line 68

def mattr_getter_thread *names
  opts = Hash === names[-1] ? names.pop : EMPTY_HASH

  initialize = opts[:initialize]
  initialize = "||= [ #{initialize} ]" if initialize

  default = opts[:default]
  default = "__val ||= [ #{default} ]" if default

  transform = opts[:transform]
  transform = "__val = (#{transform})" if transform

  names.each do | name |
    instance_eval(expr = <<"END", __FILE__, __LINE__)
def self.clear_#{name}
  Thread.current[:'#{self.name}.#{name}'] = nil
  self
end

def self.#{name}
  __val = Thread.current[:'#{self.name}.#{name}'] #{initialize}
  #{default}
  __val &&= __val.first
  #{transform}
  __val
end
END
    # $stderr.puts "#{expr}"
  end
end