Class: Screen

Inherits:

ActiveRecord::Base

• Object
• ActiveRecord::Base
• Screen

show all

Includes:

ActiveModel::ForbiddenAttributesProtection, PublicActivity::Common

Defined in:

app/models/screen.rb

Constant Summary

ONLINE_THRESHOLD =

Scopes

5.minutes

OFFLINE_THRESHOLD =

5.minutes

SCREEN_OWNER_TYPES =

types of entities that may “own” a screen

["User", "Group"]

Instance Method Summary (collapse)

• - (Object) aspect_ratio

  Determine the screen's aspect ratio.

• - (Object) gcd(a, b)

  Run Euclidean algorithm to find GCD.

• - (Boolean) is_offline?
• - (Boolean) is_online?
• - (Object) mark_updated
• - (Object) sometimes_mark_updated(pct = 0.1)

  Mark the screen as updated some percentage of the time.

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# File 'app/models/screen.rb', line 35

def aspect_ratio
  if width.nil? || height.nil?
    return { :width=> "", :height=> "" }
  end
  gcd = gcd(width,height)
  aspect_width = width/gcd
  aspect_height = height/gcd
  return {:width => aspect_width, :height => aspect_height }
end

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# File 'app/models/screen.rb', line 46

def gcd (a,b)
  if b == 0
    return a
  end
  return gcd(b, a.modulo(b))
end

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# File 'app/models/screen.rb', line 68

def is_offline?
  frontend_updated_at.nil? || frontend_updated_at < (Clock.time - Screen::OFFLINE_THRESHOLD)
end

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# File 'app/models/screen.rb', line 64

def is_online?
  !frontend_updated_at.nil? && frontend_updated_at >= (Clock.time - Screen::ONLINE_THRESHOLD)
end

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# File 'app/models/screen.rb', line 53

def mark_updated
  update_column(:frontend_updated_at, Clock.time)
end

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# File 'app/models/screen.rb', line 60

def sometimes_mark_updated(pct=0.1)
  mark_updated if rand() <= pct
end