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class Sample
attr_reader :time, :speed, :bytesDownloaded, :bytesLeft, :peersTotal
def Sample.averageSpeed(sample1, sample2)
if sample2.time - sample1.time > 0
return (sample1.bytesLeft - sample2.bytesLeft).to_f / (sample2.time - sample1.time).to_f
else
return sample1.speed
end
end
def <=>(other)
@time <=> other.time
end
# parses a single sample from a line. Format is
#
# \<tt>timestamp,speed,bytesDownloaded,bytesLeft,peersTotal</tt>
#
# where
# - timestamp is in seconds since epoch (Integer)
# - speed is bytes/seconds as Integer
# - bytesDownloaded, bytesLeft are bytes as Integer
# - peersTotal is the number of available peers (both seeders and leecher, both
# connected and not connected to us)
def Sample.parse(line)
splitted = line.split(",")
# TODO: do better error checking
return nil if splitted.length != 5
time = splitted[0].to_i
speed = splitted[1].to_i
bytesDownloaded = splitted[2].to_i
bytesLeft = splitted[3].to_i
peersTotal = splitted[4].to_i
return Sample.new(time, speed, bytesDownloaded, bytesLeft, peersTotal)
end
# parses samples from a text file, with one sample per line
def Sample.parseFromFile(filename)
samples = Hash.new
input = File.open(filename)
input.each_line do |line|
s = Sample.parse(line)
samples[s.time] = s unless s == nil
end
input.close
return samples
end
def initialize(time, speed, bytesDownloaded, bytesLeft, peersTotal)
@time = time
@speed = speed
@bytesDownloaded = bytesDownloaded
@bytesLeft = bytesLeft
@peersTotal = peersTotal
end
end
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