Class: Karafka::Pro::Processing::StrategySelector

Inherits:
Object
  • Object
show all
Defined in:
lib/karafka/pro/processing/strategy_selector.rb

Overview

Selector of appropriate processing strategy matching topic combinations When using Karafka Pro, there is a different set of strategies than for regular, as there are different features.

Constant Summary collapse

SUPPORTED_FEATURES =

Strategies that we support in the Pro offering They can be combined

%i[
  active_job
  long_running_job
  manual_offset_management
  virtual_partitions
  dead_letter_queue
  filtering
].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ StrategySelector

Returns a new instance of StrategySelector.



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# File 'lib/karafka/pro/processing/strategy_selector.rb', line 34

def initialize
  # Preload the strategies
  # We load them once for performance reasons not to do too many lookups
  @strategies = find_all
end

Instance Attribute Details

#strategies ⇒ Object (readonly)

Returns the value of attribute strategies.



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# File 'lib/karafka/pro/processing/strategy_selector.rb', line 21

def strategies
  @strategies
end

Instance Method Details

#find(topic) ⇒ Module

Returns module with proper strategy.

Parameters:

Returns:

  • (Module) —

    module with proper strategy



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# File 'lib/karafka/pro/processing/strategy_selector.rb', line 43

def find(topic)
  feature_set = SUPPORTED_FEATURES.map do |feature_name|
    topic.public_send("#{feature_name}?") ? feature_name : nil
  end

  feature_set.compact!
  feature_set.sort!

  @strategies.find do |strategy|
    strategy::FEATURES.sort == feature_set
  end || raise(Errors::StrategyNotFoundError, topic.name)
end