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Contents
require 'ganymed/sampler/datasource'
module Ganymed
class Sampler
##
# A Derive {DataSource data source} will store the derivative of the line
# going from the last to the current value of the data source. Derive is
# similar to a {Counter} {DataSource data source} in that it produces a
# rate/s gauge, but only accepts absolute values and produces the
# derivative instead of summation of all samples.
#
class Derive < DataSource
def flush
each do |ns, origin, ts|
values = ts.each_cons(2).map do |a, b|
(b[1].last - a[1].last)/(b[0] - a[0]) # ∆value / ∆ts
end.reject do |value|
value < 0 # ignore overflow/counter wrap
end
yield ns, origin, values
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems