Class: PredictabilityEngine::Calculators::Throughput

Inherits:
Object
  • Object
show all
Defined in:
lib/predictability_engine/calculators/throughput.rb

Class Method Summary collapse

Class Method Details

.average(work_items, start_date: nil, end_date: nil) ⇒ Object 



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# File 'lib/predictability_engine/calculators/throughput.rb', line 30

def self.average(work_items, start_date: nil, end_date: nil)
  counts = daily(work_items, start_date: start_date, end_date: end_date).values
  return 0 if counts.empty?

  counts.sum.to_f / counts.size
end

.daily(work_items, start_date: nil, end_date: nil) ⇒ Object 



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# File 'lib/predictability_engine/calculators/throughput.rb', line 6

def self.daily(work_items, start_date: nil, end_date: nil)
  completed = work_items.select(&:completed?)
  return {} if completed.empty?

  start_date ||= completed.map(&:end_date).min
  end_date ||= completed.map(&:end_date).max

  counts = initial_daily_counts(start_date, end_date)
  populate_daily_counts(counts, completed, start_date, end_date)
end

.histogram_data(work_items) ⇒ Object 



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# File 'lib/predictability_engine/calculators/throughput.rb', line 37

def self.histogram_data(work_items)
  daily(work_items).values.tally.sort
end

.initial_daily_counts(start_date, end_date) ⇒ Object 



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# File 'lib/predictability_engine/calculators/throughput.rb', line 17

def self.initial_daily_counts(start_date, end_date)
  (start_date..end_date).to_h { |d| [d, 0] }
end

.populate_daily_counts(counts, completed, start_date, end_date) ⇒ Object 



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# File 'lib/predictability_engine/calculators/throughput.rb', line 21

def self.populate_daily_counts(counts, completed, start_date, end_date)
  completed.each do |item|
    next if item.end_date < start_date || item.end_date > end_date

    counts[item.end_date] += 1
  end
  counts
end