Module: Nucleus::Adapters::V1::OpenshiftV2::Scaling

Included in:
Nucleus::Adapters::V1::OpenshiftV2
Defined in:
lib/nucleus/adapters/v1/openshift_v2/scaling.rb

Instance Method Summary collapse

Instance Method Details

#scale(application_id, instances) ⇒ Object

See Also:



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# File 'lib/nucleus/adapters/v1/openshift_v2/scaling.rb', line 7

def scale(application_id, instances)
  id = app_id_by_name(application_id)
  app = get("/application/#{id}").body[:data]
  fail_with(:not_scalable, [application_id]) unless app[:scalable]

  # check if scaling would exceed the available gears
  user = get('/user').body[:data]
  available_gears = user[:max_gears] - user[:consumed_gears]
  requires_additional_gears = instances - app[:gear_count]
  if requires_additional_gears > available_gears
    fail_with(:insufficient_gears, [application_id, instances, requires_additional_gears, available_gears])
  end

  # scale up if we require more gears
  while requires_additional_gears > 0
    send_event(id, 'scale-up')
    requires_additional_gears -= 1
  end

  # scale down if we have too much gears
  while requires_additional_gears < 0
    send_event(id, 'scale-down')
    requires_additional_gears += 1
  end

  # reload the app to see if all operations were taken into account
  application(id)
end