Class: Cubicle::Aggregation::MapReduceHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/cubicle/aggregation/map_reduce_helper.rb

Class Method Summary collapse

Class Method Details

.generate_finalize_function(query) ⇒ Object 



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# File 'lib/cubicle/aggregation/map_reduce_helper.rb', line 55

def generate_finalize_function(query)
  <<FINALIZE
    function(key,value)
    {

  #{(query.measures.select{|m|m.aggregation_method == :average}).map do |m|
    "value.#{m.name}=value.#{m.name}/value.#{m.name}_count;"
  end.join("\n")}




    return value;
    }
FINALIZE
end

.generate_keys_string(query) ⇒ Object 



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# File 'lib/cubicle/aggregation/map_reduce_helper.rb', line 6

def generate_keys_string(query)
  "{#{query.dimensions.map{|dim|dim.to_js_keys}.flatten.join(", ")}}"
end

.generate_map_function(query) ⇒ Object 



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# File 'lib/cubicle/aggregation/map_reduce_helper.rb', line 14

def generate_map_function(query)
  map="emit(#{generate_keys_string(query)},#{generate_values_string(query)});"
  if query.respond_to?(:expansions)
    query.expansions.reverse.each do |expansion|
      map = "for (#{expansion.index_variable} in #{expansion.expression}){ var #{expansion.value_variable} = #{expansion.expression}[#{expansion.index_variable}];#{map}}"                
    end if query.expansions
  end
  "function(){#{map}}"
end

.generate_reduce_function ⇒ Object 



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# File 'lib/cubicle/aggregation/map_reduce_helper.rb', line 24

def generate_reduce_function()
  <<REDUCE
  function(key,values){
	var output = {};
	values.forEach(function(doc){
for(var measure_name in doc){
    var measure_value = doc[measure_name];
    if (measure_value || measure_value == 0){
        if (typeof(measure_value) == "number") {
          output[measure_name] = output[measure_name] || 0;
          output[measure_name] += measure_value;
        }
        else if (measure_value) {
          output[measure_name] = output[measure_name] || {}
          if (typeof(measure_value)=="string")
            output[measure_name][measure_value] = true;
          if (typeof(measure_value)=="object") {
            for (var unique in measure_value){
              if (typeof(unique)=="string"){output[measure_name][unique]=true;}
            }
          }

        }
			}
		}
	  });     
	  return output;
  }
REDUCE
end

.generate_values_string(query) ⇒ Object 



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# File 'lib/cubicle/aggregation/map_reduce_helper.rb', line 10

def generate_values_string(query)
  "{#{query.measures.map{|measure|measure.to_js_keys}.flatten.join(", ")}}"
end