Dependency

Synopsis

This module is included in Object and allows methods to be given prerequisite dependencies, i.e. methods that must be run before they are.

A dependency will only ever be run once per method call.

  include MethodDependency

  def one; @str << '1'; end
  def two; @str << '2'; end

  def show; @str ; end

  depend :show => [ :x, :y ]

  show  #=> '12'

You can add this functionality to the whole system by simply including it at the toplevel.

Author

• Thomas Sawyer

Notes

• The included call back does a comparison to Object. This is a bit of a hack b/c there is actually no way to check if it is the toplevel —a flaw w/ Ruby‘s toplevel proxy.

Todo

• Need to be more flexible with passing arguments to dependency methods.
• Avoid global variable. How?

Copying

  Copyright (c) 2006 Thomas Sawyer

  Ruby License

  This module is free software. You may use, modify, and/or redistribute this
  software under the same terms as Ruby.

  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  FOR A PARTICULAR PURPOSE.