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Contents
# frozen_string_literal: true
module Karafka
# Internal stuff related to workers
module Workers
# Builder is used to check if there is a proper consumer with the same name as
# a consumer and if not, it will create a default one using Karafka::BaseWorker
# This is used as a building layer between consumers and workers. it will be only used
# when user does not provide his own worker that should perform consumer stuff
class Builder
# @param consumer_class [Karafka::BaseConsumer] descendant of Karafka::BaseConsumer
# @example Create a worker builder
# Karafka::Workers::Builder.new(SuperConsumer)
def initialize(consumer_class)
@consumer_class = consumer_class
end
# @return [Class] Sidekiq worker class that already exists or new build based
# on the provided consumer_class name
# @example Consumer: SuperConsumer
# build #=> SuperWorker
# @example Consumer: Videos::NewVideosConsumer
# build #=> Videos::NewVideosWorker
def build
return matcher.match if matcher.match
klass = Class.new(base)
matcher.scope.const_set(matcher.name, klass)
end
private
# @return [Class] descendant of Karafka::BaseWorker from which all other workers
# should inherit
# @raise [Karafka::Errors::BaseWorkerDescentantMissing] raised when Karafka cannot detect
# direct Karafka::BaseWorker descendant from which it could build workers
def base
Karafka::BaseWorker.subclasses.first || raise(Errors::BaseWorkerDescentantMissing)
end
# @return [Karafka::Helpers::ClassMatcher] matcher instance for matching between consumer
# and appropriate worker
def matcher
@matcher ||= Helpers::ClassMatcher.new(
@consumer_class,
from: 'Consumer',
to: 'Worker'
)
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems