Class: OpenTelemetry::SDK::Trace::Samplers::ConsistentProbabilityBased Private

Inherits:
Object
  • Object
show all
Includes:
ConsistentProbabilityTraceState
Defined in:
lib/opentelemetry/sdk/trace/samplers/consistent_probability_based.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Implements consistent sampling based on a probability.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(probability) ⇒ ConsistentProbabilityBased

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of ConsistentProbabilityBased.



19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 
# File 'lib/opentelemetry/sdk/trace/samplers/consistent_probability_based.rb', line 19

def initialize(probability)
  if probability < 2e-62
    @p_floor = 63
    @p_ceil = @p_ceil_probability = 0
    @description = 'ConsistentProbabilityBased{0}'
    return
  end

  @p_floor = (Math.frexp(probability)[1] - 1).abs
  @p_ceil = @p_floor - 1
  floor = Math.ldexp(1.0, -@p_floor)
  ceil = Math.ldexp(1.0, -@p_ceil)
  @p_ceil_probability = (probability - floor) / (ceil - floor)
  @description = format('ConsistentProbabilityBased{%.6f}', probability)
end

Instance Attribute Details

#description ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



17
18
19
 
# File 'lib/opentelemetry/sdk/trace/samplers/consistent_probability_based.rb', line 17

def description
  @description
end

Instance Method Details

#==(other) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



35
36
37
 
# File 'lib/opentelemetry/sdk/trace/samplers/consistent_probability_based.rb', line 35

def ==(other)
  @description == other.description
end

#should_sample?(trace_id:, parent_context:, links:, name:, kind:, attributes:) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

See OpenTelemetry::SDK::Trace::Samplers.

Returns:

  • (Boolean) 


42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
 
# File 'lib/opentelemetry/sdk/trace/samplers/consistent_probability_based.rb', line 42

def should_sample?(trace_id:, parent_context:, links:, name:, kind:, attributes:)
  parent_span_context = OpenTelemetry::Trace.current_span(parent_context).context
  p = probabilistic_p
  tracestate = parent_span_context.tracestate
  parse_ot_vendor_tag(tracestate) do |_, r, rest|
    if r.nil? || r > 62
      OpenTelemetry.logger.debug("ConsistentProbabilitySampler: potentially inconsistent trace detected - r: #{r.inspect}") if parent_span_context.valid?
      r = generate_r(trace_id)
    end
    if p <= r
      Result.new(decision: Decision::RECORD_AND_SAMPLE, tracestate: update_tracestate(tracestate, p, r, rest))
    else
      Result.new(decision: Decision::DROP, tracestate: update_tracestate(tracestate, nil, r, rest))
    end
  end
end