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require 'Sample'
# abstract base class of all estimators
class Estimator
# processes a sample
def process(sample)
end
# returns an estimate (ETA as float)
# note that you must process at least one sample before this will return meaningful output
def estimate
end
# returns the name of the estimator
def name
end
end
# estimator that uses the current speed
class CSAEstimator < Estimator
def process(sample)
@sample = sample.clone
end
def estimate
return @sample.bytesLeft.to_f / @sample.speed
end
def name
'CurrentSpeedEstimator'
end
end
# estimator that uses the global average speed of the whole torrent download for estimation
class GASAEstimator < Estimator
def process(sample)
@first = sample.clone if @first == nil
@last = sample.clone
@avgSpeed = Sample.averageSpeed(@first, @last)
end
def estimate
return @last.bytesLeft.to_f / @avgSpeed
end
def name
'AverageSpeedEstimator'
end
end
# estimator that uses the average over the last n seconds
class WINXEstimator < Estimator
attr_reader :windowSize
def process(sample)
# remove all samples that are older than the window size. Note: samples are sorted.
@list.pop until @list.length <= 1 or (sample.time - @list.last.time) <= @windowSize
# prepend array with newest sample
@list.unshift(sample.clone)
end
def estimate
if @list.length > 1
first = @list.first
last = @list.last
return first.bytesLeft.to_f / Sample.averageSpeed(last, first)
elsif @list.length == 1
sample = @list.first
return sample.bytesLeft.to_f / sample.speed
elsif @list.length == 0
return 0
end
end
def name
"MovingAverageEstimator_#{@windowSize}s"
end
def initialize(windowSizeInSeconds)
@list = Array.new
@windowSize = windowSizeInSeconds
end
end
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