Class: Metrician::Redis

Inherits:
Reporter show all
Defined in:
lib/metrician/reporters/redis.rb

Constant Summary collapse

CACHE_METRIC = 
"cache.command".freeze

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Reporter

all, inherited

Class Method Details

.enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/metrician/reporters/redis.rb', line 6

def self.enabled?
  !!defined?(::Redis) &&
    Metrician.configuration[:cache][:enabled]
end

Instance Method Details

#instrument ⇒ Object 



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# File 'lib/metrician/reporters/redis.rb', line 11

def instrument
  return if ::Redis::Client.method_defined?(:call_with_metrician_time)
  ::Redis::Client.class_eval do
    def call_with_metrician_time(*args, &blk)
      start_time = Time.now
      begin
        call_without_metrician_time(*args, &blk)
      ensure
        duration = (Time.now - start_time).to_f
        Metrician.gauge(CACHE_METRIC, duration) if Metrician.configuration[:cache][:command][:enabled]
        if Metrician.configuration[:cache][:command_specific][:enabled]
          method_name = args[0].is_a?(Array) ? args[0][0] : args[0]
          Metrician.gauge("#{CACHE_METRIC}.#{method_name}", duration)
        end
      end
    end
    alias_method :call_without_metrician_time, :call
    alias_method :call, :call_with_metrician_time
  end
end