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module Metriks
class Snapshot
MEDIAN_Q = 0.5
P75_Q = 0.75
P95_Q = 0.95
P98_Q = 0.98
P99_Q = 0.99
P999_Q = 0.999
attr_reader :values
def initialize(values)
@values = values.sort
end
def value(quantile)
raise ArgumentError, "quantile must be between 0.0 and 1.0" if quantile < 0.0 || quantile > 1.0
return 0.0 if @values.empty?
pos = quantile * (@values.length + 1)
return @values.first if pos < 1
return @values.last if pos >= @values.length
lower = @values[pos.to_i - 1]
upper = @values[pos.to_i]
lower + (pos - pos.floor) * (upper - lower)
end
def size
@values.length
end
def median
value(MEDIAN_Q)
end
def get_75th_percentile
value(P75_Q)
end
def get_95th_percentile
value(P95_Q)
end
def get_98th_percentile
value(P98_Q)
end
def get_99th_percentile
value(P99_Q)
end
def get_999th_percentile
value(P999_Q)
end
end
end
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