Module: QueueProcessor::RootCalculation::QueueControl

Extended by:
ActiveSupport::Concern
Included in:
QueueProcessor::RootCalculation
Defined in:
lib/queue-processor/root_calculation/queue_control.rb

Defined Under Namespace

Classes: CalculationRequest

Instance Method Summary collapse

Instance Method Details

#add_to_queue ⇒ Object 



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 17

def add_to_queue
  old_queue_time = self.queued_at
  queue_time = Time.now.utc

  # We used to round(3) but that was sometimes too aggressive.  There seems
  # to either be a float precision error, or there is a difference in the
  # seralization of Time and TimeStamp records via delayed job / postgres
  # that would very rarely cause round(3) comparisions to fail when they
  # should have succeeded
  if (old_queue_time.to_f.round(2) == queue_time.to_f.round(2))
    Rails.logger.warn("#{self.describe}: queued again too quickly")
    sleep(0.001)
    add_to_queue
    return
  end

  Rails.logger.info("#{self.describe}: added to the queue at #{queue_time} (#{queue_time.to_f})")

  before_enqueue
  touch

  # XXX BOGON ALERT DO NOT USE UPDATE_ATTRIBUTE HERE - rails will do a second-based comparision of the timestamp
  # and will not update the column if only the milliseconds are different (https://gist.github.com/johnnaegle/0599240ca925f445f031)
  update_column(:queued_at, queue_time)

  do_expire_calculation

  self.queue_work(queue_time)
end

#before_enqueue ⇒ Object 



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 8

def before_enqueue
end

#can_start? ⇒ Boolean

called when the delayed job is deserailized and ready to run. The calculation can be performed if the time the delayed job was queued matches the time the calculation was queued. We round the times to two places as there seem to be float / serialization differences between postgres / YAML / Time / TimeStamp objects. We didn’t quite identify the problem, but this fixes error - jobs not running when they should.

Returns:

  • (Boolean) 


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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 65

def can_start?
  self.queued_at.present? && self.queued_at.to_f.round(2) == self.delayed_job_queued_at.to_f.round(2)
end

#delayed_job_options ⇒ Object 



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 78

def delayed_job_options
   {:priority=>priority, :run_at => run_at, :queue => queue}.reject {|k,v| v.nil?}
end

#delayed_jobs ⇒ Object 



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 13

def delayed_jobs
  Delayed::Backend::ActiveRecord::Job.where("handler ilike '%RootCalculation::QueueControl::CalculationRequest%' and handler like '%id: #{id}%'")
end

#dependencies_in_queue? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 97

def dependencies_in_queue?
  dependent_calculation_groups.inject(false) { |result, dependent_calculation_group| result|| dependent_calculation_group.something_queued? }
end

#describe ⇒ Object 



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 69

def describe
  "Calculate #{self.class.to_s}: #{self.id}"
end

#do_expire_calculation ⇒ Object

expire our GMI - make it stale



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 48

def do_expire_calculation
  begin
    self.with_lock do
      fire_events!(:expire_calculation)
    end
  rescue StateMachine::Error => e
    Rails.logger.warn("#{self.describe}: invalid state transition expiring calculation: #{self.attributes}, changed: #{self.changed_attributes.map {|k,v| {k => {v => self.send(k) }}}}")
    raise e
  end
end

#in_queue? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 93

def in_queue?
  delayed_jobs.count > 0
end

#queue_work(queued_at) ⇒ Object 



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 73

def queue_work(queued_at)
  Rails.logger.debug {"#{self.describe}: queued at #{queued_at.to_f}"}
  Delayed::Job.enqueue(CalculationRequest.new(self.id, queued_at, self.describe, self.class), delayed_job_options)
end

#requeue_work(queued_at) ⇒ Object 



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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 83

def requeue_work(queued_at)
  Rails.logger.debug {"#{self.describe}: re-queued at #{queued_at.to_f}"}
  do_expire_calculation # ensure that our calculation in statel - we're in the queue, it better be
  queue_work(queued_at)
end

#something_queued? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/queue-processor/root_calculation/queue_control.rb', line 89

def something_queued?
  in_queue? || dependencies_in_queue?
end