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