Class: Turnstile::Sampler

Inherits:

Object

• Object
• Turnstile::Sampler

Defined in:

lib/turnstile/sampler.rb

Instance Method Summary

• #extrapolate(n) ⇒ Object
• #sample(uid) ⇒ Object

  this method uses a unique string to integer hashing (object->hash) sampling shifts depending on the day of the month so that sampling does not stick to the same people all the time.

Instance Method Details

#extrapolate(n) ⇒ Object

# File 'lib/turnstile/sampler.rb', line 3

def extrapolate(n)
  (n * 100.0 / sampling_rate).to_i
end

#sample(uid) ⇒ Object

this method uses a unique string to integer hashing (object->hash) sampling shifts depending on the day of the month so that sampling does not stick to the same people all the time

# File 'lib/turnstile/sampler.rb', line 10

def sample(uid)
  ((uid.hash + Time.now.day) % 100) < sampling_rate
end