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Contents
#--
# Copyright (c) 2008, 2009 Jeremy Hinegardner
# All rights reserved. See LICENSE and/or COPYING for details.
#++
require 'forwardable'
module Hitimes
#
# A ValueMetric holds the data from measuring a single value over a period of
# time. In most cases this may be a single measurement at a single point in
# time.
#
# A good example of a ValueMetric is measuring the number of items in a queue.
#
# A ValueMetric contains a Stats object, therefore ValueMetric has +count+, +max+,
# +mean+, +min+, +stddev+, +sum+, +sumsq+ methods that delegate to that Stats
# object for convenience.
#
class ValueMetric < Metric
# holds all the statistics
attr_reader :stats
#
# :call-seq:
# ValueMetric.new( 'my_metric' ) -> ValueMetric
# ValueMetric.new( 'my_metric', 'foo' => 'bar', 'this' => 42 ) -> ValueMetric
#
# Create a new ValueMetric giving it a name and additional data.
# +additional_data+ may be anything that follows the +to_hash+ protocol.
#
def initialize( name, additional_data = {} )
super( name, additional_data )
@stats = Stats.new
end
#
# :call-seq:
# metric.measure( value ) -> Float
#
# Give the +value+ as the measurement to the metric. The value is returned
#
def measure( value )
@sampling_start_time ||= self.utc_microseconds()
@sampling_start_interval ||= Interval.now
@stats.update( value )
# update the length of time we have been sampling
@sampling_delta = @sampling_start_interval.duration_so_far
end
#
# :call-seq:
# metric.to_hash -> Hash
#
# Convert the metric to a hash
#
def to_hash
h = super
(Stats::STATS - %w[ rate ]).each do |s|
h[s] = self.send( s )
end
return h
end
# forward appropriate calls directly to the stats object
extend Forwardable
def_delegators :@stats, :count, :max, :mean, :min, :stddev, :sum, :sumsq
end
end
Version data entries
47 entries across 45 versions & 4 rubygems