Ruby 动态特性鉴赏
以下代码与代码学习来自<Ruby Best Practives>，主要描述了一幅生动的Ruby语言动态特性使用场景。
#!/usr/bin/env ruby## encoding: utf-8## Base module NativeCampingRoutesmodule NativeCampingRoutes # This is a convenient way to make instance methods into class methods. # And you can use this method to make a singleton. # http://ozmm.org/posts/singin_singletons.html # 将成员对象方法上升为类方法 extend self def R(url) route_lookup = routes # Get a class-object klass = Class.new # Modify the meta-class-object(klass) # Extend the modules' methods to klass meta = class << klass; self; end #meta class, overwrite the define_method #The following block will be called by Class.instance_eval meta.send(:define_method, :inherited) do |base| raise "Already defined" if route_lookup[url] route_lookup[url] = base end klass end def routes @routes ||= {} end def process(url, params={}) routes[url].new.get(params) endendmodule NativeCampingRoutes #R '/hello' # will create a class-object which has been overwrited the define_method class Hello < R '/hello' #This will be invoked by overwrited method(define_method) def get(params) puts "hello #{params[:name]}" end end class Goodbye < R '/goodbye' def get(params) puts "goodbye #{params[:name]}" end endendNativeCampingRoutes.process('/hello',:name=>'greg')NativeCampingRoutes.process('/goodbye',:name=>'joe')?