Class: Racecar::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/racecar/runner.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(consumer_class, config:, logger:, instrumenter: NullInstrumenter) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/racecar/runner.rb', line 22

def initialize(consumer_class, config:, logger:, instrumenter: NullInstrumenter)
  @consumer_class, @config, @logger = consumer_class, config, logger
  @instrumenter = instrumenter
  @stop_requested = false
  @partition_processors = Concurrent::Hash.new
  @consumer_class_instance = consumer_class.new
  if @consumer_class_instance.respond_to?(:statistics_callback) && Rdkafka::Config.statistics_callback.nil?
    Rdkafka::Config.statistics_callback = @consumer_class_instance.method(:statistics_callback).to_proc
  end
  Rdkafka::Config.logger = logger
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/racecar/runner.rb', line 15

def config
  @config
end

#consumer_class ⇒ Object (readonly)

Returns the value of attribute consumer_class.



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# File 'lib/racecar/runner.rb', line 15

def consumer_class
  @consumer_class
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/racecar/runner.rb', line 15

def logger
  @logger
end

#partition_processors ⇒ Object (readonly)

Returns the value of attribute partition_processors.



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# File 'lib/racecar/runner.rb', line 15

def partition_processors
  @partition_processors
end

Class Method Details

.topic_partition_key(topic, partition) ⇒ Object 



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# File 'lib/racecar/runner.rb', line 34

def self.topic_partition_key(topic, partition)
  "#{topic}/#{partition}"
end

Instance Method Details

#consumer ⇒ Object 



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# File 'lib/racecar/runner.rb', line 100

def consumer
  @consumer ||= begin
    ConsumerSet.new(config, logger, @partition_processors, @instrumenter)
  end
end

#processor ⇒ Object

Kept for backward compatibility — external code calls ‘processor`.



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# File 'lib/racecar/runner.rb', line 18

def processor
  @consumer_class_instance
end

#run ⇒ Object 



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# File 'lib/racecar/runner.rb', line 38

def run
  install_signal_handlers
  @stop_requested = false

  unless config.multithreaded_processing_enabled
    @consumer_class_instance.configure(
      producer:     consumer.producer,
      consumer:     consumer,
      instrumenter: @instrumenter,
      config:       config,
    )
  end

  loop_payload = {
    consumer_class: consumer_class.to_s,
    consumer_set: consumer
  }
  # Main loop
  begin
    loop do
      break if @stop_requested

      @instrumenter.instrument("start_main_loop", loop_payload)
      @instrumenter.instrument("main_loop", loop_payload) do
        resume_all_paused_partitions unless config.multithreaded_processing_enabled

        case process_method
        when :batch then
          msg_per_part = consumer.batch_poll(config.max_wait_time_ms).group_by(&:partition)
          msg_per_part.each_value do |messages_per_partition|
            processor = assign_and_get_processor(messages_per_partition)
            processor&.process_batch(messages_per_partition) unless processor&.rebalancing_or_shutting_down?
          end
        when :single then
          message = consumer.poll(config.max_wait_time_ms)
          if message
            processor = assign_and_get_processor(message)
            processor&.process(message) unless processor&.rebalancing_or_shutting_down?
          end
        end
      end
    end
  ensure
    logger.info "Gracefully shutting down"
    shutdown_processors_and_wait
    consumer.commit
  end
ensure
  begin
    @instrumenter.instrument('leave_group') do
      consumer.close
    end
  ensure
    Racecar::Datadog.close if config.datadog_enabled
    @instrumenter.instrument("shut_down", loop_payload || {})
  end
end

#stop ⇒ Object 



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# File 'lib/racecar/runner.rb', line 96

def stop
  @stop_requested = true
end