Class: Fin::Model

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/fin/models/model.rb

Overview

Represents business domain model for a single item (Quote, Deal, Instrument, etc…) Currently it is only used to extract common functionality from record wrappers, down the road the goal is to add ActiveModel compatibility

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Model

TODO: Builder pattern, to avoid args Array creation on each initialize?



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# File 'lib/fin/models/model.rb', line 101

def initialize *args
  @attributes = {}
  opts = args.last.is_a?(Hash) ? args.pop : {}
  each_with_index { |(name, _), i| send "#{name}=", args[i] } unless args.empty?
  opts.each { |name, value| send "#{name}=", value }
end

Class Method Details

.attribute_types ⇒ Object 



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# File 'lib/fin/models/model.rb', line 9

def self.attribute_types
  @attribute_types ||= (superclass.attribute_types.dup rescue {})
end

.from_msg(msg) ⇒ Object

Unpacks attributes into appropriate Model subclass



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# File 'lib/fin/models/model.rb', line 81

def self.from_msg msg
  class_id = msg.first
  model_classes[class_id].new *msg[1..-1]
end

.from_record(rec) ⇒ Object 



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# File 'lib/fin/models/model.rb', line 76

def self.from_record rec
  new *extract_attributes(rec)
end

.model_class_id(value = nil) ⇒ Object 



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# File 'lib/fin/models/model.rb', line 13

def self.model_class_id value = nil
  if value
    @model_class_id ||= value
    model_classes[@model_class_id] = self
  else
    @model_class_id
  end
end

.model_classes ⇒ Object 



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# File 'lib/fin/models/model.rb', line 22

def self.model_classes
  @model_classes ||= (superclass.model_classes rescue {}) #shared list for all subclasses
end

.property(prop_hash) ⇒ Object 



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# File 'lib/fin/models/model.rb', line 26

def self.property prop_hash
  prop_hash.each do |arg, type|
    aliases = [arg].flatten
    name = aliases.shift
    instance_eval do

      attribute_types[name.to_s] = type.to_s

      define_method(name) do
        @attributes[name]
      end

      define_method("#{name}=") do |value|
        @attributes[name] = value
      end

      aliases.each do |ali|
        alias_method "#{ali}", name
        alias_method "#{ali}=", "#{name}="
      end
    end
  end

  # Using static calls, create class method extracting attributes from raw records
  attribute_extractor = attribute_types.map do |name, type|
    case type
       # TODO: Using indexes (...ByIndex) instead of names gives ~60% speed boost
      when /^i[14]/
        "rec.GetValAsLong('#{name}')"
      when /^i8/
        "rec.GetValAsVariant('#{name}')"
      when /^[df]/
        "rec.GetValAsString('#{name}').to_f"
      when /^[c]/
        "rec.GetValAsString('#{name}')"
      when /^[t]/ # "2009/12/01 12:35:44.785" => 20091201123544785
        "rec.GetValAsVariant('#{name}')"
      else
        raise "Unrecognized attribute type: #{name} => #{type}"
    end
  end.join(",\n")

  extractor_body = "def self.extract_attributes rec
                      [#{attribute_extractor}]
                    end"

#      puts "In #{self}:, #{extractor_body"
  instance_eval extractor_body
end

.to_msg(rec) ⇒ Object

Extracts attributes from record into a serializable format (Array) Returns an Array where 1st element is a model_class_id of our Model subclass, followed by a list of arguments to its initialize. Class method!



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# File 'lib/fin/models/model.rb', line 89

def self.to_msg rec
  extract_attributes(rec).unshift(model_class_id)
end

Instance Method Details

#each ⇒ Object Also known as: each_property 



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# File 'lib/fin/models/model.rb', line 108

def each
  if block_given?
    self.class.attribute_types.each { |name, _| yield [name, send(name)] }
  else
    self.class.attribute_types.map { |name, _| [name, send(name)].to_enum }
  end
end

#index ⇒ Object 



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# File 'lib/fin/models/model.rb', line 131

def index
  object_id # TODO: @repl_id?
end

#inspect(divider = ',') ⇒ Object 



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# File 'lib/fin/models/model.rb', line 118

def inspect divider=','
  map { |property, value| "#{property}=#{value}" }.join(divider)
end

#to_msg ⇒ Object

Converts OBJECT attributes into a serializable format (Array) Returns an Array where 1st element is a model_class_id of our Model subclass, followed by a list of arguments to its initialize. Instance method!



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# File 'lib/fin/models/model.rb', line 96

def to_msg
  inject([self.class.model_class_id]) { |array, (name, _)| array << send(name) }
end