Class: Droonga::BasicCollector

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

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_attributes_and_format(items, output) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 81

def apply_output_attributes_and_format(items, output)
  attributes = output["attributes"]
  if attributes
    format = output["format"]
    if format == "complex"
      items.collect! do |item|
        complex_item = {}
        attributes.each_with_index do |label, index|
          complex_item[label] = item[index]
        end
        complex_item
      end
    else
      items.collect! do |item|
        item[0...attributes.size]
      end
    end
  end
  items
end

#apply_output_range(items, output) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 66

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)
    elements = output["elements"]
    if elements && elements.is_a?(Hash)
      # phase 1: pre-process
      elements.each do |element, mapper|
        case mapper["type"]
        when "count"
          result[element] = result[mapper["target"]].size
        when "sort"
          # do nothing on this phase!
        end
      end
      # phase 2: post-process
      elements.each do |element, mapper|
        if mapper["no_output"]
          result.delete(element)
          next
        end

        case mapper["type"]
        when "count"
          # do nothing on this phase!
        when "sort"
          # because "count" type mapper requires all items of the array,
          # I have to apply "sort" type mapper later.
          if result[element]
            result[element] = apply_output_range(result[element], mapper)
            result[element] = apply_output_attributes_and_format(result[element], mapper)
          end
        end
      end
    end
    output = output["output"]
  end
  emit(output, result)
end

#collector_reduce(request) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 103

def collector_reduce(request)
  return unless request
  body[input_name].each do |output, elements|
    value = request
    old_value = output_values[output]
    value = reduce(elements, old_value, request) if old_value
    emit(output, value)
  end
end

#compare(x, y, operators) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 165

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 135

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 154

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

#reduce(elements, *values) ⇒ Object 



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# File 'lib/droonga/plugin/collector/basic.rb', line 113

def reduce(elements, *values)
  result = {}
  elements.each do |key, deal|
    reduced_values = nil

    case deal["type"]
    when "sum"
      reduced_values = values[0][key] + values[1][key]
    when "sort"
      reduced_values = merge(values[0][key],
                             values[1][key],
                             :operators => deal["operators"],
                             :key_column => deal["key_column"])
    end

    reduced_values = apply_output_range(reduced_values, "limit" => deal["limit"])

    result[key] = reduced_values
  end
  return result
end

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



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# File 'lib/droonga/plugin/collector/basic.rb', line 176

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