Class: FnordMetric::Toplist

Inherits:
Object
  • Object
show all
Defined in:
lib/fnordmetric/toplist.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(timeline = {}) ⇒ Toplist

Returns a new instance of Toplist.



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# File 'lib/fnordmetric/toplist.rb', line 5

def initialize(timeline = {})
  @total   = 0
  @toplist = Hash.new{ |h,k| h[k] = 0 }

  @timelines = Hash.new do |h,k|
    h[k] = Hash.new{ |h,k| h[k] = 0 }
  end
end

Instance Attribute Details

#timelines ⇒ Object

Returns the value of attribute timelines.



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# File 'lib/fnordmetric/toplist.rb', line 3

def timelines
  @timelines
end

#total ⇒ Object

Returns the value of attribute total.



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# File 'lib/fnordmetric/toplist.rb', line 3

def total
  @total
end

Instance Method Details

#incr_item(time, item, value) ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 14

def incr_item(time, item, value)
  @toplist[item] += value.to_f
  @timelines[item][time] += value.to_f
  @total += value.to_f
end

#percentage(item) ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 31

def percentage(item)
  (@toplist[item].to_f / total.to_f) * 100.0
end

#prepare! ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 20

def prepare!
  @toplist_arr = @toplist.to_a.sort do |a,b|
    b.last <=> a.last
  end
end

#rank(item) ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 47

def rank(item)
  prepare! unless @toplist_arr

  @toplist_arr.index([item, value(item)]) + 1
end

#toplist(take = 100) ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 26

def toplist(take = 100)
  prepare! unless @toplist_arr
  @toplist_arr[0..(take-1)]
end

#trend(item) ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 39

def trend(item)
  times = @timelines[item].keys.sort

  (@timelines[item][times.last] - 
  @timelines[item][times.first]) / 
  @timelines[item][times.first]
end

#trending(take = 100) ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 53

def trending(take = 100)
  @toplist.to_a.map{ |k,v| 
    [k, trend(k)]
  }.sort{ |a,b|
    b.last <=> a.last
  }[0..(take-1)]
end

#value(item) ⇒ Object 



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# File 'lib/fnordmetric/toplist.rb', line 35

def value(item)
  @toplist[item].to_f
end