Class: Metrics::Instruments::Meter
Constant Summary
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- INTERVAL_SECONDS =
5.0
- ONE_MINUTE_FACTOR =
1 - Math.exp(-INTERVAL_SECONDS / 60.0)
- FIVE_MINUTE_FACTOR =
1 - Math.exp(-INTERVAL_SECONDS / (60.0 * 5.0))
- FIFTEEN_MINUTE_FACTOR =
1 - Math.exp(-INTERVAL_SECONDS / (60.0 * 15.0))
TimeConversion::UNITS
Instance Attribute Summary collapse
Instance Method Summary
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#convert_to_ns, #scale_time_units
Methods inherited from Instrument
#tag, #tags
Constructor Details
#initialize(options = {}) ⇒ Meter
Returns a new instance of Meter.
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# File 'lib/ruby-metrics/instruments/meter.rb', line 18
def initialize(options = {})
@units = options[:units]
clear
@timer_thread = Thread.new do
begin
loop do
tick
sleep(INTERVAL_SECONDS)
end
rescue Exception => e
logger.error "Error in timer thread: #{e.class.name}: #{e}\n #{e.backtrace.join("\n ")}"
end
end
end
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Instance Attribute Details
#count ⇒ Object
Also known as:
counted
Returns the value of attribute count.
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# File 'lib/ruby-metrics/instruments/meter.rb', line 15
def count
@count
end
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#units ⇒ Object
Returns the value of attribute units.
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# File 'lib/ruby-metrics/instruments/meter.rb', line 15
def units
@units
end
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Instance Method Details
#as_json(*_) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 86
def as_json(*_)
{
:one_minute_rate => one_minute_rate,
:five_minute_rate => five_minute_rate,
:fifteen_minute_rate => fifteen_minute_rate
}
end
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#calc_rate(rate, factor, count) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 45
def calc_rate(rate, factor, count)
rate.to_f + factor.to_f * (count.to_f - rate.to_f)
end
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#clear ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 34
def clear
@one_minute_rate = @five_minute_rate = @fifteen_minute_rate = 0.0
@count = 0
@initialized = false
@start_time = Time.now.to_f
end
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#fifteen_minute_rate(rate_unit = :seconds) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 72
def fifteen_minute_rate(rate_unit = :seconds)
convert_to_ns @fifteen_minute_rate, rate_unit
end
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#five_minute_rate(rate_unit = :seconds) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 68
def five_minute_rate(rate_unit = :seconds)
convert_to_ns @five_minute_rate, rate_unit
end
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#mark(count = 1) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 41
def mark(count = 1)
@count += count
end
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#mean_rate(rate_unit = :seconds) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 76
def mean_rate(rate_unit = :seconds)
if @count == 0
0.0
else
elapsed = Time.now.to_f - @start_time.to_f
scale_factor = scale_time_units(:seconds, rate_unit)
@count.to_f / (elapsed * scale_factor)
end
end
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#one_minute_rate(rate_unit = :seconds) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 64
def one_minute_rate(rate_unit = :seconds)
convert_to_ns @one_minute_rate, rate_unit
end
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#tick ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 49
def tick
count = @count.to_f / Seconds.to_nsec(INTERVAL_SECONDS).to_f
if @initialized
@one_minute_rate = calc_rate(@one_minute_rate, ONE_MINUTE_FACTOR, count)
@five_minute_rate = calc_rate(@five_minute_rate, FIVE_MINUTE_FACTOR, count)
@fifteen_minute_rate = calc_rate(@fifteen_minute_rate, FIFTEEN_MINUTE_FACTOR, count)
else
@one_minute_rate = @five_minute_rate = @fifteen_minute_rate = count
@initialized = true
end
@count = 0
end
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#to_json(*_) ⇒ Object
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# File 'lib/ruby-metrics/instruments/meter.rb', line 94
def to_json(*_)
as_json.to_json
end
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