Class: NewRelic::Agent::SampledBuffer

Inherits:
Object
  • Object
show all
Defined in:
lib/new_relic/agent/sampled_buffer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(capacity) ⇒ SampledBuffer

Returns a new instance of SampledBuffer.



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 15

def initialize(capacity)
  @items = []
  @capacity = capacity
  @captured_lifetime = 0
  @seen = 0
  @seen_lifetime = 0
end

Instance Attribute Details

#capacity ⇒ Object

Returns the value of attribute capacity.



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 13

def capacity
  @capacity
end

#captured_lifetime ⇒ Object (readonly)

Returns the value of attribute captured_lifetime.



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 13

def captured_lifetime
  @captured_lifetime
end

#seen ⇒ Object (readonly)

Returns the value of attribute seen.



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 13

def seen
  @seen
end

#seen_lifetime ⇒ Object (readonly)

Returns the value of attribute seen_lifetime.



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 13

def seen_lifetime
  @seen_lifetime
end

Instance Method Details

#<<(x) ⇒ Object 



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 39

def <<(x)
  @seen += 1
  if @items.size < @capacity
    @items << x
  else
    m = rand(@seen) # [0, @seen)
    if m < @capacity
      @items[m] = x
    else
      # discard current sample
    end
  end
  return self
end

#append(x) ⇒ Object

Like ‘<<’, but returns the value of full?



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 35

def append(x)
  (self << x).full?
end

#full? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/sampled_buffer.rb', line 30

def full?
  @items.size >= @capacity
end

#reset ⇒ Object 



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 23

def reset
  @captured_lifetime += @items.size
  @seen_lifetime += @seen
  @items = []
  @seen = 0
end

#sample_rate ⇒ Object 



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 69

def sample_rate
  @seen > 0 ? (size.to_f / @seen) : 0.0
end

#sample_rate_lifetime ⇒ Object 



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 73

def sample_rate_lifetime
  @captured_lifetime > 0 ? (@captured_lifetime.to_f / @seen_lifetime) : 0.0
end

#size ⇒ Object 



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 54

def size
  @items.size
end

#to_a ⇒ Object 



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# File 'lib/new_relic/agent/sampled_buffer.rb', line 58

def to_a
  @items.dup
end