Module: Karafka::Pro::Routing::Features::DirectAssignments::Topic

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

Overview

Topic extensions for direct assignments

Instance Method Summary collapse

Instance Method Details

#direct_assignments(*partitions_or_all) ⇒ Object Also known as: assign

Allows for direct assignment of

Examples:

Assign all available partitions

direct_assignments(true)

Assign partitions 2, 3 and 5

direct_assignments(2, 3, 5)

Assign partitions from 0 to 3

direct_assignments(0..3)

Parameters:

  • partitions_or_all (true, Array<Integer>) —

    informs Karafka that we want to use direct assignments instead of automatic for this topic. It also allows us to specify which partitions we’re interested in or true if in all



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# File 'lib/karafka/pro/routing/features/direct_assignments/topic.rb', line 34

def direct_assignments(*partitions_or_all)
  @direct_assignments ||= if partitions_or_all == [true]
    Config.new(
      active: true,
      partitions: true
    )
  elsif partitions_or_all.size == 1 && partitions_or_all.first.is_a?(Range)
    partitions_or_all = partitions_or_all.first.to_a

    Config.new(
      active: true,
      partitions: partitions_or_all.map { |partition| [partition, true] }.to_h
    )
  else
    Config.new(
      active: !partitions_or_all.empty?,
      partitions: partitions_or_all.map { |partition| [partition, true] }.to_h
    )
  end
end

#to_h ⇒ Hash

Returns topic with all its native configuration options plus direct assignments.

Returns:

  • (Hash) —

    topic with all its native configuration options plus direct assignments



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# File 'lib/karafka/pro/routing/features/direct_assignments/topic.rb', line 59

def to_h
  super.merge(
    direct_assignments: direct_assignments.to_h
  ).freeze
end