Class: StatsD::Instrument::BatchedUDPSink::Dispatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/statsd/instrument/batched_udp_sink.rb

Constant Summary collapse

BUFFER_CLASS = 
if !::Object.const_defined?(:RUBY_ENGINE) || RUBY_ENGINE == "ruby"
  ::Array
else
  begin
    gem("concurrent-ruby")
  rescue Gem::MissingSpecError
    raise Gem::MissingSpecError, "statsd-instrument depends on `concurrent-ruby` on #{RUBY_ENGINE}"
  end
  require "concurrent/array"
  Concurrent::Array
end

Instance Method Summary collapse

Constructor Details

#initialize(host, port, flush_interval, flush_threshold, buffer_capacity, thread_priority, max_packet_size) ⇒ Dispatcher

Returns a new instance of Dispatcher.



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# File 'lib/statsd/instrument/batched_udp_sink.rb', line 77

def initialize(host, port, flush_interval, flush_threshold, buffer_capacity, thread_priority, max_packet_size)
  @host = host
  @port = port
  @interrupted = false
  @flush_interval = flush_interval
  @flush_threshold = flush_threshold
  @buffer_capacity = buffer_capacity
  @thread_priority = thread_priority
  @max_packet_size = max_packet_size
  @buffer = BUFFER_CLASS.new
  @dispatcher_thread = Thread.new { dispatch }
  @pid = Process.pid
  @monitor = Monitor.new
  @condition = @monitor.new_cond
end

Instance Method Details

#<<(datagram) ⇒ Object 



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# File 'lib/statsd/instrument/batched_udp_sink.rb', line 93

def <<(datagram)
  if thread_healthcheck
    @buffer << datagram

    # To avoid sending too many signals when the thread is already flushing
    # We only signal when the queue size is a multiple of `flush_threshold`
    if @buffer.size % @flush_threshold == 0
      wakeup_thread
    end

    # A SizedQueue would be perfect, except that it doesn't have a timeout
    # Ref: https://bugs.ruby-lang.org/issues/18774
    if @buffer.size >= @buffer_capacity
      StatsD.logger.warn do
        "[#{self.class.name}] Max buffer size reached (#{@buffer_capacity}), pausing " \
          "thread##{Thread.current.object_id}"
      end
      before = Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_millisecond)
      @monitor.synchronize do
        while @buffer.size >= @buffer_capacity && @dispatcher_thread.alive?
          @condition.wait(0.01)
        end
      end
      duration = Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_millisecond) - before
      StatsD.logger.warn do
        "[#{self.class.name}] thread##{Thread.current.object_id} resumed after #{duration.round(2)}ms"
      end
    end
  else
    flush
  end

  self
end

#shutdown(wait = @flush_interval * 2) ⇒ Object 



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# File 'lib/statsd/instrument/batched_udp_sink.rb', line 128

def shutdown(wait = @flush_interval * 2)
  @interrupted = true
  if @dispatcher_thread&.alive?
    @dispatcher_thread.join(wait)
  else
    flush
  end
end