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# Copyright (c) 2015 Sqreen. All Rights Reserved.
# Please refer to our terms for more information: https://www.sqreen.com/terms.html
require 'sqreen/mono_time'
require 'sqreen/metrics/base'
module Sqreen
module Metric
# Takes numbers as samples and bins them (effectively, rounds them).
# Also collect max values
class Binning < Base
BASE_KEY = 'base'.freeze
FACTOR_KEY = 'factor'.freeze
# upper bound of i-th bin is factor * base^(i-1)
def initialize(opts={})
options = opts.dup
@base = options.delete(BASE_KEY)
@factor = options.delete(FACTOR_KEY)
super(options)
log_base = Math.log(@base)
log_factor = Math.log(@factor)
@inv_log_base = 1 / log_base
@add_parcel = - log_factor / log_base
new_sample(Sqreen.time)
end
def update(_key, x)
h = @sample[OBSERVATION_KEY]
bin = bin_no(x)
h[bin] += 1
h['max'] = x if x > h['max']
end
def next_sample(time)
return nil if @sample[OBSERVATION_KEY].empty?
super(time)
end
protected
# these two are called by next_sample
def finalize_sample(time)
@sample[FINISH_KEY] = time
h = @sample[OBSERVATION_KEY]
@sample[OBSERVATION_KEY] = { 'u' => @factor, 'b' => @base, 'v' => h }
end
def new_sample(time)
@sample = {
OBSERVATION_KEY => Hash.new { |hash, key| hash[key] = 0 },
START_KEY => time,
}
end
private
def bin_no(x)
return 1 if x <= 0
res = 2 + (@inv_log_base * Math.log(x) + @add_parcel).floor
res < 1 ? 1 : res
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems