Module: Honeycomb::DeterministicSampler

Included in:
Span
Defined in:
lib/honeycomb/deterministic_sampler.rb

Overview

Provides a should_sample method which can be used for deterministic sampling

Constant Summary collapse

MAX_INT32 = 
2**32 - 1

Instance Method Summary collapse

Instance Method Details

#should_sample(rate, value) ⇒ Object 



13
14
15
16
17
18
19
20
 
# File 'lib/honeycomb/deterministic_sampler.rb', line 13

def should_sample(rate, value)
  return true if rate == 1

  upper_bound = MAX_INT32 / rate
  digest = Digest::SHA1.digest(value)[0, 4]
  value = digest.unpack1("I!>")
  value <= upper_bound
end