覚書: Rails: GoodJob アダプタの割り当てと enqueue と discrete

GoodJob のコードの一部を読んだ際の覚書です。

Rails 7.0.5
GoodJob 3.15.10

Documentation for good_job (3.15.10)

アダプタの割り当て

Active Job の QueueAdapter でアダプタを割り当てる。
（後日、実際に呼び出している箇所についての補足を書きました）

https://github.com/rails/rails/blob/v7.0.5/activejob/lib/active_job/queue_adapter.rb#LL40

module ActiveJob
  module QueueAdapter # :nodoc:
    module ClassMethods
      def queue_adapter=(name_or_adapter)
        case name_or_adapter
        when Symbol, String
          queue_adapter = ActiveJob::QueueAdapters.lookup(name_or_adapter).new
          assign_adapter(name_or_adapter.to_s, queue_adapter)

ActiveJob::QueueAdapters
https://github.com/rails/rails/blob/v7.0.5/activejob/lib/active_job/queue_adapters.rb#L136-L138

module ActiveJob
  module QueueAdapters
    class << self
      # Returns adapter for specified name.
      #
      #   ActiveJob::QueueAdapters.lookup(:sidekiq)
      #   # => ActiveJob::QueueAdapters::SidekiqAdapter
      def lookup(name)
        const_get(name.to_s.camelize << ADAPTER)
      end

Sidekiq などのアダプタは ActiveJob 側にあるが、GoodJob は Gem 側にある。
なぜこうなっているのかは分かりません。
https://github.com/rails/rails/tree/v7.0.5/activejob/lib/active_job/queue_adapters

https://github.com/bensheldon/good_job/blob/v3.15.10/lib/active_job/queue_adapters/good_job_adapter.rb
https://github.com/bensheldon/good_job/blob/v3.15.10/lib/good_job/adapter.rb

module ActiveJob # :nodoc:
  module QueueAdapters # :nodoc:
    # See {GoodJob::Adapter} for details.
    class GoodJobAdapter < GoodJob::Adapter
    end
  end
end

enqueue

https://api.rubyonrails.org/classes/ActiveJob/Enqueuing.html#method-i-enqueue
https://github.com/rails/rails/blob/v7.0.5/activejob/lib/active_job/enqueuing.rb

module ActiveJob
  module Enqueuing
    module ClassMethods
    def enqueue(options = {})
...
      run_callbacks :enqueue do
        if scheduled_at
          queue_adapter.enqueue_at self, scheduled_at
        else
          queue_adapter.enqueue self
        end

https://github.com/bensheldon/good_job/blob/v3.15.10/lib/good_job/adapter.rb

module GoodJob
  class Adapter
    def enqueue(active_job)
      enqueue_at(active_job, nil)
    end
    ...
    def enqueue_at(active_job, timestamp)
    ...
      execution = GoodJob::Execution.enqueue(
        active_job,
        scheduled_at: scheduled_at,
        create_with_advisory_lock: will_execute_inline
      )

https://github.com/bensheldon/good_job/blob/v3.15.10/app/models/good_job/execution.rb#L307

module GoodJob
  class Execution < BaseExecution
    def self.enqueue(active_job, scheduled_at: nil, create_with_advisory_lock: false)
      ActiveSupport::Notifications.instrument("enqueue_job.good_job", { active_job: active_job, scheduled_at: scheduled_at, create_with_advisory_lock: create_with_advisory_lock }) do |instrument_payload|
...
        instrument_payload[:execution] = execution
        execution.save!

discrete

https://github.com/bensheldon/good_job/blob/v3.15.10/lib/generators/good_job/templates/install/migrations/create_good_jobs.rb.erb

テーブル設計で discrete が気になったので検索してみました。
下記で今までの経緯と関連する提案が確認できます。

以上です。