Class: Tem::Mr::Search::WebClientQueryBuilder

Inherits:
MapReduceJob
  • Object
show all
Defined in:
lib/tem_mr_search/web_client_query_builder.rb

Instance Attribute Summary

Attributes inherited from MapReduceJob

#attributes, #finalizer, #id_attribute, #mapper, #reducer

Class Method Summary collapse

Methods inherited from MapReduceJob

#bind, #initialize, #to_hash, #unpack_decrypted_output

Constructor Details

This class inherits a constructor from Tem::Mr::Search::MapReduceJob

Class Method Details

.query(options) ⇒ Object

Builds a client query covering preferences expressed in the Web UI.

The supported (and required) options are:

layovers_cost:: the cost of each layover
start_time_cost:: the cost of the flight's departure time, in minutes
duration_cost:: the cost of each minute of flying



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# File 'lib/tem_mr_search/web_client_query_builder.rb', line 11

def self.query(options)
  QueryBuilder.query { |q|
    q.attributes :price => :tem_short, :start_time => :tem_short,
                 :end_time => :tem_short, :layovers => :tem_short
    q.id_attribute :flight
    
    # Score: 20000 - price - layover_cost * layovers -
    #                start_time * start_time_cost -
    #                (end_time - start_time) * duration_cost
    q.map { |s|
      s.ldwc 20000
      s.ldw :price
      s.sub
      s.ldw :end_time
      s.ldw :start_time
      s.sub
      s.ldwc options[:duration_cost]
      s.mul
      s.sub
      [:start_time, :layovers].each do |factor|
        s.ldw factor
        s.ldwc options[:"#{factor}_cost"]
        s.mul
        s.sub
      end
      s.stw :score
    }

    # The greater score wins.
    q.reduce { |s|
      s.ldw :score1
      s.ldw :score2
      s.cmp
      s.stw :comparison
    }
  }
end