Class: Fairway::Sidekiq::BasicFetch

Inherits:
Sidekiq::BasicFetch
  • Object
show all
Defined in:
lib/fairway/sidekiq/basic_fetch.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ BasicFetch

Returns a new instance of BasicFetch.



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# File 'lib/fairway/sidekiq/basic_fetch.rb', line 6

def initialize(options)
  @queues = options[:queues].map { |q| "queue:#{q}" }
end

Instance Attribute Details

#queues ⇒ Object (readonly)

Returns the value of attribute queues.



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# File 'lib/fairway/sidekiq/basic_fetch.rb', line 4

def queues
  @queues
end

Instance Method Details

#namespace ⇒ Object 



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# File 'lib/fairway/sidekiq/basic_fetch.rb', line 47

def namespace
  @namespace ||= begin
    namespaces = []

    ::Sidekiq.redis do |conn|
      wrapper = conn

      while defined?(wrapper.redis)
        namespaces.unshift(wrapper.namespace)
        wrapper = wrapper.redis
      end

      namespace = namespaces.join(":")
      namespace += ":" unless namespace.blank?
      namespace
    end
  end
end

#queues_cmd ⇒ Object 



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# File 'lib/fairway/sidekiq/basic_fetch.rb', line 43

def queues_cmd
  @queues.shuffle.uniq
end

#retrieve_work(options = {}) ⇒ Object 



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# File 'lib/fairway/sidekiq/basic_fetch.rb', line 10

def retrieve_work(options = {})
  options = { blocking: true }.merge(options)

  ::Sidekiq.logger.debug "#{self.class.name}#retrieve_work #{queues_cmd}"

  work = ::Sidekiq.redis do |conn|
    script = "      -- take advantage of non-blocking scripts\n      for i = 1, #KEYS do\n        local work = redis.call('rpop', KEYS[i]);\n\n        if work then\n          return {KEYS[i], work};\n        end\n      end\n\n      return nil;\n    SCRIPT\n\n    conn.eval(script, queues_cmd.map{|q| \"\#{namespace}\#{q}\"})\n  end\n\n  if (work)\n    ::Sidekiq.logger.debug \"\#{self.class.name}#retrieve_work got work\"\n    work = UnitOfWork.new(*work)\n  else\n    ::Sidekiq.logger.debug \"\#{self.class.name}#retrieve_work got nil\"\n    sleep 1 if options[:blocking]\n  end\n\n  work\nend\n"