Module: Karafka::Pro::Routing::Features::DirectAssignments::SubscriptionGroup

Defined in:
lib/karafka/pro/routing/features/direct_assignments/subscription_group.rb

Overview

Extension allowing us to select correct subscriptions and assignments based on the expanded routing setup

Instance Method Summary collapse

Instance Method Details

#assignments(consumer) ⇒ Rdkafka::Consumer::TopicPartitionList

Returns final tpl for assignments.

Parameters:

Returns:

  • (Rdkafka::Consumer::TopicPartitionList) —

    final tpl for assignments



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# File 'lib/karafka/pro/routing/features/direct_assignments/subscription_group.rb', line 33

def assignments(consumer)
  topics
    .select(&:active?)
    .select { |topic| topic.direct_assignments.active? }
    .to_h { |topic| build_assignments(topic) }
    .tap { |topics| return false if topics.empty? }
    .then { |topics| Iterator::Expander.new.call(topics) }
    .then { |topics| Iterator::TplBuilder.new(consumer, topics).call }
end

#subscriptions ⇒ false, Array<String>

Returns false if we do not have any subscriptions or array with all the subscriptions for given subscription group.

Returns:

  • (false, Array<String>) —

    false if we do not have any subscriptions or array with all the subscriptions for given subscription group



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# File 'lib/karafka/pro/routing/features/direct_assignments/subscription_group.rb', line 22

def subscriptions
  topics
    .select(&:active?)
    .reject { |topic| topic.direct_assignments.active? }
    .map(&:subscription_name)
    .then { |subscriptions| subscriptions.empty? ? false : subscriptions }
end