Module: SelectiveAttributeProxy

Included in:
Aliyun::ESS::Collection, Aliyun::ESS::ScalingGroup, Aliyun::ESS::ScalingInstance, Aliyun::ESS::ScalingRule
Defined in:
lib/aliyun/ess/extensions.rb

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/aliyun/ess/extensions.rb', line 113

def self.included(klass)
  klass.extend(ClassMethods)
  klass.class_eval("    cattr_accessor :attribute_proxy\n    cattr_accessor :attribute_proxy_options\n    \n    # Default name for attribute storage\n    self.attribute_proxy         = :attributes\n    self.attribute_proxy_options = {:exclusively => true}\n    \n    private\n      # By default proxy all attributes\n      def proxiable_attribute?(name)\n        return true unless self.class.attribute_proxy_options[:exclusively]\n        send(self.class.attribute_proxy).has_key?(name)\n      end\n      \n      def method_missing(method, *args, &block)\n        # Autovivify attribute storage\n        if method == self.class.attribute_proxy\n          ivar = \"@\\\#{method}\"\n          instance_variable_set(ivar, {}) unless instance_variable_get(ivar).is_a?(Hash)\n          instance_variable_get(ivar)\n        # Delegate to attribute storage\n        elsif method.to_s =~ /^(\\\\w+)(=?)$/ && proxiable_attribute?($1)\n          attributes_hash_name = self.class.attribute_proxy\n          $2.empty? ? send(attributes_hash_name)[$1] : send(attributes_hash_name)[$1] = args.first\n        else\n          super\n        end\n      end\n  EVAL\nend\n", __FILE__, __LINE__)