Class: Jaeger::Samplers::Probabilistic

Inherits:
Object
  • Object
show all
Defined in:
lib/jaeger/samplers/probabilistic.rb

Overview

Probabilistic sampler

Sample a portion of traces using trace_id as the random decision

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rate: 0.001) ⇒ Probabilistic

Returns a new instance of Probabilistic.



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# File 'lib/jaeger/samplers/probabilistic.rb', line 11

def initialize(rate: 0.001)
  update(rate: rate)
end

Instance Attribute Details

#rate ⇒ Object (readonly)

Returns the value of attribute rate.



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# File 'lib/jaeger/samplers/probabilistic.rb', line 9

def rate
  @rate
end

Instance Method Details

#sample(trace_id:) ⇒ Object 



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# File 'lib/jaeger/samplers/probabilistic.rb', line 33

def sample(trace_id:, **)
  [@boundary >= trace_id, @tags]
end

#update(rate:) ⇒ Object 



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# File 'lib/jaeger/samplers/probabilistic.rb', line 15

def update(rate:)
  if rate < 0.0 || rate > 1.0
    raise "Sampling rate must be between 0.0 and 1.0, got #{rate.inspect}"
  end

  new_boundary = TraceId::TRACE_ID_UPPER_BOUND * rate
  return false if @boundary == new_boundary

  @rate = rate
  @boundary = TraceId::TRACE_ID_UPPER_BOUND * rate
  @tags = {
    'sampler.type' => 'probabilistic',
    'sampler.param' => rate
  }

  true
end