Contents

=begin
                  Arachni
  Copyright (c) 2010-2011 Tasos "Zapotek" Laskos <[e-mail]>

  This is free software; you can copy and distribute and modify
  this program under the term of the GPL v2.0 License
  (See LICENSE file for details)

=end

module Arachni

require Options.instance.dir['lib'] + 'module/utilities'

module Mixins

#
# Provides a flexible way to make any Class observable via callbacks/hooks
# using simple dynamic programming with the help of "method_missing()".
#
# The observable classes (those which include this module) use:
#    * call_<hookname>( *args )
# to call specific hooks.
#
# The observers set hooks using:
#    * observer_instance.add_<hookname>( &block )
#
#
# @author: Tasos "Zapotek" Laskos
#                                      <[e-mail]>
#                                      <[e-mail]>
# @version: 0.1
#
module Observable

    include Arachni::Module::Utilities

    def method_missing( sym, *args, &block )

        # grab the action (add/call) and the hook name
        action, hook = sym.to_s.split( '_', 2 )

        @__hooks       ||= {}
        @__hooks[hook] ||= []

        if( action && hook )
            case action

            when 'add'
                add_block( hook, &block )
                return

             when 'call'
                call_blocks( hook, args )
                return
            end
        end

        raise NoMethodError.new( "Undefined method '#{sym.to_s}'.", sym, args )
    end

    private

    def add_block( hook, &block )
        @__hooks[hook] << block
    end

    def call_blocks( hook, *args )
        @__hooks[hook].each {
            |block|

            exception_jail {

                if args.flatten.size == 1
                    block.call( args.flatten[0] )
                else
                    block.call( *args )
                end
            }

        }
    end

end

end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
arachni-0.3	lib/mixins/observable.rb
arachni-0.2.4	lib/mixins/observable.rb
arachni-0.2.3	lib/mixins/observable.rb
arachni-0.2.2.2	lib/mixins/observable.rb