Class: AWS::Core::Resource

Inherits:
Object
  • Object
show all
Includes:
Cacheable, Model
Defined in:
lib/aws/core/resource.rb

Defined Under Namespace

Classes: Attribute, AttributeProvider, NotFound

Instance Attribute Summary

Attributes included from Model

#config

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Cacheable

included, #retrieve_attribute

Methods included from Model

#client, #config_prefix

Constructor Details

#initialize(*args) ⇒ Resource

Returns a new instance of Resource.


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# File 'lib/aws/core/resource.rb', line 28

def initialize *args
  
  super
  
  # cache static attributes passed into options
  
  options = args.last.is_a?(Hash) ? args.last : {}
  options.each_pair do |opt_name,opt_value|
    if 
      self.class.attributes.has_key?(opt_name) and
      self.class.attributes[opt_name].static?
    then
      static_attributes[opt_name] = opt_value
    end
  end
  
end

Class Method Details

.attribute_providersObject


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# File 'lib/aws/core/resource.rb', line 198

def attribute_providers
  @attribute_providers ||= []
end

.attribute_providers_for(request_type) ⇒ Object


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# File 'lib/aws/core/resource.rb', line 203

def attribute_providers_for request_type
  attribute_providers.select do |provider|
    provider.request_types.include?(request_type)
  end
end

.attributesObject


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# File 'lib/aws/core/resource.rb', line 191

def attributes
  @attributes ||= Hash.new do |hash,attr_name|
    raise "uknown attribute #{attr_name}"
  end
end

.define_attribute_type(type_name) ⇒ Object


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# File 'lib/aws/core/resource.rb', line 168

def define_attribute_type type_name
  class_eval <<-METHODS

    def self.#{type_name}_attributes
      @#{type_name}_attributes ||= {}  
    end

    def self.#{type_name}_attribute name, options = {}, &block
      attr = attribute(name, options, &block)
      #{type_name}_attributes[attr.name] = attr
    end

  METHODS
end

.new_from(request_type, resp_obj, *args) ⇒ Object


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# File 'lib/aws/core/resource.rb', line 184

def new_from request_type, resp_obj, *args
  resource = new(*args)  
  resource.send(:cache_static_attributes, request_type, resp_obj)
  resource
end

Instance Method Details

#attributes_from_response(resp) ⇒ Object


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# File 'lib/aws/core/resource.rb', line 123

def attributes_from_response resp

  # check each provider for this request type to see if it
  # can find the resource and some of its attributes
  attributes = []
  self.class.attribute_providers_for(resp.request_type).each do |provider|
    attributes << provider.attributes_from_response(self, resp)
  end

  # drop out those that returned no attributesj
  attributes.compact!

  # stop here if nothing was found for this resource
  return nil if attributes.empty?

  # merge the attributes together into a single hash
  attributes = attributes.inject({}) {|hash,attribs| hash.merge(attribs) }
  
  # cache static attributes
  attributes.each_pair do |attr_name,value|
    if self.class.attributes[attr_name].static?
      static_attributes[attr_name] = value
    end
  end

  attributes
  
end

#eql?(other) ⇒ Boolean Also known as: ==

Returns true if the objects references the same AWS resource.

Returns:

  • (Boolean)

    Returns true if the objects references the same AWS resource.


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# File 'lib/aws/core/resource.rb', line 64

def eql? other
  other.kind_of?(self.class) and 
  other.resource_identifiers == resource_identifiers
end

#inspectString

Returns a simple string representation of this resource.

Returns:

  • (String)

    Returns a simple string representation of this resource.


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# File 'lib/aws/core/resource.rb', line 47

def inspect
  
  identifiers = []
  resource_identifiers.each do |key, value|
    if attr = self.class.attributes.values.find{|a| a.get_as == key }
      identifiers << "#{attr.name}:#{value}"
    else
      identifiers << "#{key}:#{value}"
    end
  end
  
  "<#{self::class} #{identifiers.join(' ')}>"
  
end