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這些方法將包含在每個 Active Job 物件中，新增 perform 和 enqueue 方法的回呼。

方法
A
B

執行個體公開方法

after_enqueue(*filters, &blk)

定義在工作佇列處理完工作後立即呼叫的回呼。

class VideoProcessJob < ActiveJob::Base
  queue_as :default

  after_enqueue do |job|
    result = job.successfully_enqueued? ? "success" : "failure"
    $statsd.increment "enqueue-video-job.#{result}"
  end

  def perform(video_id)
    Video.find(video_id).process
  end
end

來源：顯示 | 於 GitHub

# File activejob/lib/active_job/callbacks.rb, line 141
def after_enqueue(*filters, &blk)
  set_callback(:enqueue, :after, *filters, &blk)
end

after_perform(*filters, &blk)

定義在工作佇列處理完工作 perform 方法後立即呼叫的回呼。

class VideoProcessJob < ActiveJob::Base
  queue_as :default

  after_perform do |job|
    UserMailer.notify_video_processed(job.arguments.first)
  end

  def perform(video_id)
    Video.find(video_id).process
  end
end

來源：顯示 | 於 GitHub

# File activejob/lib/active_job/callbacks.rb, line 69
def after_perform(*filters, &blk)
  set_callback(:perform, :after, *filters, &blk)
end

around_enqueue(*filters, &blk)

定義在工作佇列處理完 enqueue 方法時呼叫的回呼。

class VideoProcessJob < ActiveJob::Base
  queue_as :default

  around_enqueue do |job, block|
    $statsd.time "video-job.process" do
      block.call
    end
  end

  def perform(video_id)
    Video.find(video_id).process
  end
end

來源：顯示 | 於 GitHub

# File activejob/lib/active_job/callbacks.rb, line 162
def around_enqueue(*filters, &blk)
  set_callback(:enqueue, :around, *filters, &blk)
end

around_perform(*filters, &blk)

定義在工作佇列處理完工作 perform 方法時呼叫的回呼。

class VideoProcessJob < ActiveJob::Base
  queue_as :default

  around_perform do |job, block|
    UserMailer.notify_video_started_processing(job.arguments.first)
    block.call
    UserMailer.notify_video_processed(job.arguments.first)
  end

  def perform(video_id)
    Video.find(video_id).process
  end
end

只有在執行未中斷的情況下，才能存取工作回傳值。

class VideoProcessJob < ActiveJob::Base
  around_perform do |job, block|
    value = block.call
    puts value # => "Hello World!"
  end

  def perform
    "Hello World!"
  end
end

來源：顯示 | 於 GitHub

# File activejob/lib/active_job/callbacks.rb, line 102
def around_perform(*filters, &blk)
  set_callback(:perform, :around, *filters, &blk)
end

before_enqueue(*filters, &blk)

定義在工作佇列處理 enqueue 方法前立即呼叫的回呼。

class VideoProcessJob < ActiveJob::Base
  queue_as :default

  before_enqueue do |job|
    $statsd.increment "enqueue-video-job.try"
  end

  def perform(video_id)
    Video.find(video_id).process
  end
end

來源：顯示 | 於 GitHub

# File activejob/lib/active_job/callbacks.rb, line 121
def before_enqueue(*filters, &blk)
  set_callback(:enqueue, :before, *filters, &blk)
end

before_perform(*filters, &blk)

定義在工作佇列處理 perform 方法前立即呼叫的回呼。

class VideoProcessJob < ActiveJob::Base
  queue_as :default

  before_perform do |job|
    UserMailer.notify_video_started_processing(job.arguments.first)
  end

  def perform(video_id)
    Video.find(video_id).process
  end
end

來源：顯示 | 於 GitHub

# File activejob/lib/active_job/callbacks.rb, line 50
def before_perform(*filters, &blk)
  set_callback(:perform, :before, *filters, &blk)
end