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require 'prometheus/client/metric'
require 'prometheus/client/uses_value_type'
module Prometheus
module Client
# Summary is an accumulator for samples. It captures Numeric data and
# provides an efficient quantile calculation mechanism.
class Summary < Metric
extend Gem::Deprecate
# Value represents the state of a Summary at a given point.
class Value < Hash
include UsesValueType
attr_accessor :sum, :total
def initialize(type, name, labels)
@sum = value_object(type, name, "#{name}_sum", labels)
@total = value_object(type, name, "#{name}_count", labels)
end
def observe(value)
@sum.increment(value)
@total.increment
end
end
def initialize(name, docstring, base_labels = {})
super(name, docstring, base_labels)
end
def type
:summary
end
# Records a given value.
def observe(labels, value)
label_set = label_set_for(labels)
synchronize { @values[label_set].observe(value) }
end
alias add observe
deprecate :add, :observe, 2016, 10
# Returns the value for the given label set
def get(labels = {})
@validator.valid?(labels)
synchronize do
@values[labels].sum.get
end
end
# Returns all label sets with their values
def values
synchronize do
@values.each_with_object({}) do |(labels, value), memo|
memo[labels] = value.sum
end
end
end
private
def default(labels)
Value.new(type, @name, labels)
end
end
end
end
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