gistfile1.rb

class DispatchHook
  
  class << self; attr_accessor :dispatch_hooks; end
  @dispatch_hooks = []
  
  attr_accessor :actions
    
  def self.register(*actions, &block)
    returning(self.new(actions, block)) do |hook|
      dispatch_hooks << hook
    end
  end
  
  def self.dispatch_for(action)
    #return if action.blank?
    dispatch_hooks.each {|hook| hook.try_for(action) }
    nil
  end
  
  def try_for(action)
    @hook.call if (@actions.include?(action) || actions.include?("all"))
  end

  protected
  
  def initialize(actions, block)
    @actions = actions.flatten
    @hook = block
  end
  
end

actions = %w(love dogs bone)

DispatchHook.register(actions) { puts "this does them all" }
DispatchHook.register("dogs") { puts "this is the dog one" }

DispatchHook.dispatch_for("love") #=> "this does them all" 
DispatchHook.dispatch_for("none")
DispatchHook.dispatch_for("dogs") #=> "this does them all" & "this is the dog one"