Class: Fluent::UniqueCounterOutput

Inherits:
Output
  • Object
show all
Defined in:
lib/fluent/plugin/out_unique_counter.rb

Constant Summary collapse

UNITS = 
{
  minutes: 60,
  hours: 3600,
  days: 86400
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#counts ⇒ Object

Returns the value of attribute counts.



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 13

def counts
  @counts
end

#last_checked ⇒ Object

Returns the value of attribute last_checked.



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 14

def last_checked
  @last_checked
end

#tick ⇒ Object

Returns the value of attribute tick.



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 12

def tick
  @tick
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 22

def configure(conf)
  super

  if @unit and UNITS[@unit.to_sym].nil?
    raise Fluent::ConfigError, "'unit' must be one of minutes/hours/days"
  end
  @count_interval = UNITS[@unit.to_sym] if @unit

  @counts = []
  @mutex = Mutex.new
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 69

def emit(tag, es, chain)
  c = []

  es.each do |time,record|
    value = record[@unique_key]
    next if value.nil?

    c << value.to_s.force_encoding('ASCII-8BIT')
  end
  @mutex.synchronize {
    @counts += c
  }

  chain.next
end

#flush_emit ⇒ Object 



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 45

def flush_emit
  flushed,@counts = @counts,[]
  message = {'unique_count' => flushed.uniq.count }
  Fluent::Engine.emit(@tag, Fluent::Engine.now, message)
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 39

def shutdown
  super
  @watcher.terminate
  @watcher.join
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 34

def start
  super
  start_watch
end

#start_watch ⇒ Object 



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 51

def start_watch
  # for internal, or tests only
  @watcher = Thread.new(&method(:watch))
end

#watch ⇒ Object 



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# File 'lib/fluent/plugin/out_unique_counter.rb', line 56

def watch
  # instance variable, and public accessable, for test
  @last_checked = Fluent::Engine.now
  while true
    sleep 0.5
    if (Fluent::Engine.now - @last_checked) >= @count_interval
      now = Fluent::Engine.now
      flush_emit
      @last_checked = now
    end
  end
end