Class: ScoutApm::BackgroundJobIntegrations::DelayedJob

Inherits:
Object
  • Object
show all
Defined in:
lib/scout_apm/background_job_integrations/delayed_job.rb

Constant Summary collapse

ACTIVE_JOB_KLASS = 
'ActiveJob::QueueAdapters::DelayedJobAdapter::JobWrapper'.freeze
DJ_PERFORMABLE_METHOD = 
'Delayed::PerformableMethod'.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/scout_apm/background_job_integrations/delayed_job.rb', line 7

def logger
  @logger
end

Instance Method Details

#forking? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout_apm/background_job_integrations/delayed_job.rb', line 17

def forking?
  false
end

#install ⇒ Object 



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# File 'lib/scout_apm/background_job_integrations/delayed_job.rb', line 21

def install
  plugin = Class.new(Delayed::Plugin) do
    require 'delayed_job'

    callbacks do |lifecycle|
      lifecycle.around(:invoke_job) do |job, *args, &block|
        ScoutApm::Agent.instance.start_background_worker unless ScoutApm::Agent.instance.background_worker_running?

        name = begin
                 case job.payload_object.class.to_s

                 # ActiveJob's class wraps the actual job class
                 when ACTIVE_JOB_KLASS
                   job.payload_object.job_data["job_class"]

                 # An adhoc job, called like `@user.delay.fib(10)`.
                 # returns a string like "User#fib"
                 when DJ_PERFORMABLE_METHOD
                   job.name

                 # A "real" job called like `Delayed::Job.enqueue(MyJob.new)`
                 # returns "MyJob"
                 else
                   job.payload_object.class.to_s
                 end
               rescue
                 # Fall back to whatever DJ thinks the name is.
                 job.name
               end

        queue = job.queue || "default"

        req = ScoutApm::RequestManager.lookup

        begin
          latency = Time.now - [job.created_at, job.run_at].max
          req.annotate_request(:queue_latency => latency)
        rescue
        end

        queue_layer = ScoutApm::Layer.new('Queue', queue)
        job_layer = ScoutApm::Layer.new('Job', name)

        begin
          req.start_layer(queue_layer)
          started_queue = true
          req.start_layer(job_layer)
          started_job = true

          # Call the job itself.
          block.call(job, *args)
        rescue
          req.error!
          raise
        ensure
          req.stop_layer if started_job
          req.stop_layer if started_queue
        end
      end
    end
  end

  Delayed::Worker.plugins << plugin # ScoutApm::BackgroundJobIntegrations::DelayedJobPlugin
end

#name ⇒ Object 



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# File 'lib/scout_apm/background_job_integrations/delayed_job.rb', line 9

def name
  :delayed_job
end

#present? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout_apm/background_job_integrations/delayed_job.rb', line 13

def present?
  defined?(::Delayed::Job)
end