Module: MethodMeter

Defined in:
lib/method_meter.rb,
lib/method_meter/version.rb

Constant Summary collapse

VERSION = 
'0.2.5'

Class Method Summary collapse

Class Method Details

.measure!(key) ⇒ Object 



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# File 'lib/method_meter.rb', line 42

def measure!(key)
  self.subscribers  = []
  self.data         = {} if self.data.blank?
  self.data[key]    = {}

  self.events.each do |event|
    self.subscribers << ActiveSupport::Notifications.subscribe(event) do |_, started_at, finished_at, _, _|
      self.data[key][event] = [] unless self.data[key].has_key?(event)
      self.data[key][event] << (finished_at - started_at)
    end
  end

  yield

  self.subscribers.each do |subscriber|
    ActiveSupport::Notifications.unsubscribe(subscriber)
  end
end

.measurement ⇒ Object 



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# File 'lib/method_meter.rb', line 61

def measurement
  @measurement ||= begin
    self.data.collect do |key, measurement_records|
      _measurement = measurement_records.collect do |method_name, records|
        total_calls   = records.size
        total_runtime = records.reduce(:+) * 1000
        average       = total_runtime / total_calls

        {
          method: method_name,
          min: records.min * 1000,
          max: records.max * 1000,
          average: average,
          total_runtime: total_runtime,
          total_calls: total_calls,
        }
      end

      { key => _measurement }
    end
  end
end

.observe(object) ⇒ Object 



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# File 'lib/method_meter.rb', line 11

def observe(object)
  self.events = [] if self.events.blank?

  DefinedMethods.in(object).each do |group|
    group[:object].module_eval do
      group[:methods].each do |method|
        method_with_profiling     = method.to_s + '_with_profiling'
        method_without_profiling  = method.to_s + '_without_profiling'
        event_name                = DefinedMethods.fqmn(group, method)

        next if event_name =~ /_profiling/
        next if MethodMeter.events.include?(event_name)

        MethodMeter.events << event_name

        define_method(method_with_profiling) do |*args, &block|
          ActiveSupport::Notifications.instrument(event_name, args) do
            send(method_without_profiling, *args, &block)
          end
        end

        alias_method method_without_profiling, method
        alias_method method, method_with_profiling

        private method_with_profiling if group[:private]
        protected method_with_profiling if group[:protected]
      end
    end
  end
end