Class: Metriks::UniformSample
- Inherits:
-
Object
- Object
- Metriks::UniformSample
- Defined in:
- lib/metriks/uniform_sample.rb
Instance Method Summary collapse
- #clear ⇒ Object
-
#initialize(reservoir_size) ⇒ UniformSample
constructor
A new instance of UniformSample.
- #size ⇒ Object
- #snapshot ⇒ Object
- #update(value) ⇒ Object
Constructor Details
#initialize(reservoir_size) ⇒ UniformSample
Returns a new instance of UniformSample.
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# File 'lib/metriks/uniform_sample.rb', line 6 def initialize(reservoir_size) @values = Array.new(reservoir_size, 0) @count = Atomic.new(0) end |
Instance Method Details
#clear ⇒ Object
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# File 'lib/metriks/uniform_sample.rb', line 11 def clear @values.length.times do |idx| @values[idx] = 0 end @count.value = 0 end |
#size ⇒ Object
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# File 'lib/metriks/uniform_sample.rb', line 18 def size count = @count.value count > @values.length ? @values.length : count end |
#snapshot ⇒ Object
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# File 'lib/metriks/uniform_sample.rb', line 23 def snapshot Snapshot.new(@values.slice(0, size)) end |
#update(value) ⇒ Object
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# File 'lib/metriks/uniform_sample.rb', line 27 def update(value) new_count = @count.update { |v| v + 1 } if new_count <= @values.length @values[new_count - 1] = value else idx = rand(new_count) if idx < @values.length @values[idx] = value end end end |