Class: Metriks::Reporter::NewRelic::Sampler

Inherits:
NewRelic::Agent::Sampler
  • Object
show all
Defined in:
lib/metriks/reporter/new_relic/sampler.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Sampler

Returns a new instance of Sampler.



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# File 'lib/metriks/reporter/new_relic/sampler.rb', line 6

def initialize(options={})
  @registry = options[:registry] || Metriks::Registry.default
  @cache = Hash.new
end

Instance Method Details

#newrelic_name(name) ⇒ Object 



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# File 'lib/metriks/reporter/new_relic/sampler.rb', line 46

def newrelic_name(name)
  "Custom/" + name.gsub('.', '/')
end

#poll ⇒ Object 



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# File 'lib/metriks/reporter/new_relic/sampler.rb', line 11

def poll
  @registry.each do |name, metric|
    case metric
    when defined?(Metriks::Gauge) && metric.kind_of?(Metriks::Gauge)
      NewRelic::Agent.record_metric(newrelic_name(name), metric.value)
  
    when Metriks::Timer
      count = value_update(name, :count, metric.count) do |old,new|
        new - old
      end
      min = value_update(name, :min, metric.min) do |old,new|
        new < old ? new : old
      end
      max = value_update(name, :max, metric.max) do |old,new|
        new > old ? new : old
      end
      value = {
        :total => metric.mean,
        :count => count,
        :min => min,
        :max => max,
        # NOTE: we lose the total sum of squares, not in the registry
        :sum_of_squares => 0
      }
      ::NewRelic::Agent.record_metric(newrelic_name(name), value)

    when Metriks::Counter
      count = value_update(name, :count, metric.count) do |old,new|
        new - old
      end
      ::NewRelic::Agent.increment_metric(newrelic_name(name), count)
    end
  end
end

#value_update(metric_name, field_name, new_value) ⇒ Object 



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# File 'lib/metriks/reporter/new_relic/sampler.rb', line 50

def value_update(metric_name, field_name, new_value)
  cache_key = "#{metric_name}-#{field_name}"
  if @cache[cache_key] == nil
    update = new_value
  else
    update = yield(@cache[cache_key], new_value)
  end
  @cache[cache_key] = update
  return update
end