Module: Karafka::Pro::Processing::Strategies::Dlq::FtrMom

Includes:
Default, Ftr::Default
Included in:
Aj::DlqFtrMom, FtrMomVp
Defined in:
lib/karafka/pro/processing/strategies/dlq/ftr_mom.rb

Overview

  • DLQ

  • Ftr

  • Mom

Constant Summary collapse

FEATURES =

Features for this strategy

%i[
  dead_letter_queue
  filtering
  manual_offset_management
].freeze

Instance Method Summary collapse

Methods included from Default

#apply_dlq_flow, #build_dlq_message, #dispatch_if_needed_and_mark_as_consumed, #dispatch_in_a_transaction?, #dispatch_to_dlq, #dispatch_to_dlq?, #find_skippable_message, #mark_as_consumed, #mark_as_consumed!, #mark_dispatched_to_dlq

Methods included from Karafka::Pro::Processing::Strategies::Default

#handle_before_consume, #handle_before_schedule_consume, #handle_before_schedule_tick, #handle_consume, #handle_revoked, #handle_tick, #mark_as_consumed, #mark_as_consumed!, #mark_in_memory, #mark_in_transaction, #mark_with_transaction, #store_offset_metadata, #transaction

Methods included from Karafka::Processing::Strategies::Default

#commit_offsets, #commit_offsets!, #handle_before_consume, #handle_consume, #handle_eofed, #handle_idle, #handle_initialized, #handle_revoked, #handle_shutdown, #handle_wrap, #mark_as_consumed, #mark_as_consumed!

Methods included from Karafka::Processing::Strategies::Base

#handle_before_consume, #handle_consume, #handle_idle, #handle_revoked, #handle_shutdown

Methods included from Ftr::Default

#handle_idle, #handle_post_filtering

Instance Method Details

#handle_after_consume ⇒ Object

On mom we do not mark, throttling and seeking as in other strategies



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# File 'lib/karafka/pro/processing/strategies/dlq/ftr_mom.rb', line 26

def handle_after_consume
  coordinator.on_finished do
    return if revoked?

    if coordinator.success?
      coordinator.pause_tracker.reset

      return if coordinator.manual_pause?

      handle_post_filtering
    else
      apply_dlq_flow do
        skippable_message, _marked = find_skippable_message
        dispatch_to_dlq(skippable_message) if dispatch_to_dlq?

        if mark_after_dispatch?
          mark_dispatched_to_dlq(skippable_message)
        else
          self.seek_offset = skippable_message.offset + 1
        end
      end
    end
  end
end

#mark_after_dispatch? ⇒ Boolean

Note:

Please note, this is the opposite behavior than in case of AOM strategies.

Returns should we mark given message as consumed after dispatch. For MOM strategies if user did not explicitly tell us to mark, we do not mark. Default is nil, which means false in this case. If user provided alternative value, we go with it.

Returns:

  • (Boolean) —

    should we mark given message as consumed after dispatch. For MOM strategies if user did not explicitly tell us to mark, we do not mark. Default is nil, which means false in this case. If user provided alternative value, we go with it.



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# File 'lib/karafka/pro/processing/strategies/dlq/ftr_mom.rb', line 57

def mark_after_dispatch?
  return false if topic.dead_letter_queue.mark_after_dispatch.nil?

  topic.dead_letter_queue.mark_after_dispatch
end