Class: Droonga::BasicCollector

Inherits:
CollectorPlugin show all
Defined in:
lib/droonga/plugin/collector/basic.rb

Direct Known Subclasses

GroongaCollector, SearchCollector

Constant Summary collapse

UNLIMITED = 
-1

Instance Attribute Summary

Attributes inherited from CollectorPlugin

#body, #component, #input_name, #output_names, #output_values, #task

Instance Method Summary collapse

Methods inherited from CollectorPlugin

#emit, #initialize, #process

Methods included from PluginRegisterable

#command, extended, #inherited, #method_name, #processable?, #repository

Methods inherited from Plugin

#initialize, #process, #processable?, #shutdown, #start

Constructor Details

This class inherits a constructor from Droonga::CollectorPlugin

Instance Method Details

#apply_output_range(items, output) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 73

def apply_output_range(items, output)
  if items && items.is_a?(Array)
    offset = output["offset"] || 0
    unless offset.zero?
      items = items[offset..-1] || []
    end

    limit = output["limit"] || 0
    unless limit == UNLIMITED
      items = items[0...limit]
    end
  end
  items
end

#collector_gather(result) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 27

def collector_gather(result)
  output = body ? body[input_name] : input_name
  if output.is_a?(Hash)
    output = output["output"]
  end
  emit(output, result)
end

#collector_reduce(request) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 36

def collector_reduce(request)
  body[input_name].each do |output, deal|
    left_value = output_values[output]
    right_value = request
    value = reduce(deal, left_value, right_value)
    emit(output, value)
  end
end

#compare(x, y, operators) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 128

def compare(x, y, operators)
  operators.each_with_index do |operator, index|
    column = operator["column"] || index
    operator = operator["operator"]
    _x = x[column]
    _y = y[column]
    return true if _x.__send__(operator, _y)
  end
  return false
end

#merge(x, y, options = {}) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 98

def merge(x, y, options={})
  operators = options[:operators] = normalize_operators(options[:operators])

  unify_by_key!(x, y, options)

  index = 0
  y.each do |_y|
    loop do
      _x = x[index]
      break unless _x
      break if compare(_y, _x, operators)
      index += 1
    end
    x.insert(index, _y)
    index += 1
  end
  return x
end

#normalize_operators(operators) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 117

def normalize_operators(operators)
  operators ||= []
  operators.collect do |operator|
    if operator.is_a?(String)
      { "operator" => operator }
    else
      operator
    end
  end
end

#reduce(deal, left_value, right_value) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 45

def reduce(deal, left_value, right_value)
  if left_value.nil? || right_value.nil?
    return right_value || left_value
  end

  reduced_value = nil

  case deal["type"]
  when "and"
    reduced_value = left_value && right_value
  when "sum"
    reduced_value = sum(left_value, right_value)
    reduced_value = apply_output_range(reduced_value,
                                       "limit" => deal["limit"])
  when "average"
    reduced_value = (left_value.to_f + right_value.to_f) / 2
  when "sort"
    reduced_value = merge(left_value,
                          right_value,
                          :operators => deal["operators"],
                          :key_column => deal["key_column"])
    reduced_value = apply_output_range(reduced_value,
                                       "limit" => deal["limit"])
  end

  reduced_value
end

#sum(x, y) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 88

def sum(x, y)
  return x || y if x.nil? or y.nil?

  if x.is_a?(Hash) && y.is_a?(Hash)
    x.merge(y)
  else
    x + y
  end
end

#unify_by_key!(base_items, unified_items, options = {}) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 139

def unify_by_key!(base_items, unified_items, options={})
  key_column_index = options[:key_column]
  return unless key_column_index

  # The unified records must be smaller than the base, because
  # I sort unified records at last. I want to sort only smaller array.
  if base_items.size < unified_items.size
    base_items, unified_items = unified_items, base_items
  end

  rest_unified_items = unified_items.dup

  base_items.reject! do |base_item|
    key = base_item[key_column_index]
    rest_unified_items.any? do |unified_item|
      if unified_item[key_column_index] == key
        base_item.each_with_index do |value, column|
          next if column == key_column_index
          unified_item[column] += value
        end
        rest_unified_items -= [unified_item]
        true
      else
        false
      end
    end
  end

  unless rest_unified_items.size == unified_items.size
    unified_items.sort! do |a, b|
      if compare(a, b, options[:operators])
        -1
      else
        1
      end
    end
  end
end