Class: RawkLog::Stat

Inherits:
Object
  • Object
show all
Defined in:
lib/rawk_log/stat.rb

Constant Summary collapse

DEFAULT_LABEL_SIZE = 
30
HEADER = 
"Count Sum(secs)     Max  Median     Avg     Min     Std"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key) ⇒ Stat

Returns a new instance of Stat.



9
10
11
12
13
14
15
16
17
 
# File 'lib/rawk_log/stat.rb', line 9

def initialize(key)
  @key=key
  @min = nil
  @max = nil
  @sum = 0
  @sum_squares = 0
  @count = 0
  @values = []
end

Class Method Details

.test ⇒ Object 



81
82
83
84
85
86
87
88
89
90
91
92
 
# File 'lib/rawk_log/stat.rb', line 81

def self.test
  stat = Stat.new(30)
  stat.add(5)
  stat.add(6)
  stat.add(8)
  stat.add(9)
  results = [ 7==stat.median ? "median Success" : "median Failure" ]
  results <<= (7==stat.average ? "average Success" : "average Failure")
  results <<= (158==(stat.standard_deviation*100).round ? "std Success" : "std Failure")
  puts results.join("\n")
  exit (results.select{|m| m =~ /Failure/}.size)
end

Instance Method Details

#add(value) ⇒ Object 



19
20
21
22
23
24
25
26
27
28
29
 
# File 'lib/rawk_log/stat.rb', line 19

def add(value)
  value=1.0*value
  @count+=1
  @min = value unless @min
  @min = value if value<@min
  @max = value unless @max
  @max = value if value>@max
  @sum += value
  @sum_squares += value*value
  @values << value
end

#average ⇒ Object 



55
56
57
 
# File 'lib/rawk_log/stat.rb', line 55

def average
  @count > 0 ? @sum/@count : @sum
end

#count ⇒ Object 



39
40
41
 
# File 'lib/rawk_log/stat.rb', line 39

def count
  @count
end

#header(label_size = DEFAULT_LABEL_SIZE) ⇒ Object 



31
32
33
 
# File 'lib/rawk_log/stat.rb', line 31

def header(label_size = DEFAULT_LABEL_SIZE)
  sprintf "%*s  %s" % [-label_size, "Request", HEADER]
end

#key ⇒ Object 



35
36
37
 
# File 'lib/rawk_log/stat.rb', line 35

def key
  @key
end

#max ⇒ Object 



51
52
53
 
# File 'lib/rawk_log/stat.rb', line 51

def max
  @max
end

#median ⇒ Object 



59
60
61
62
63
64
65
66
 
# File 'lib/rawk_log/stat.rb', line 59

def median
  return nil unless @values
  l = @values.length
  return nil unless l>0
  @values.sort!
  return (@values[l/2-1]+@values[l/2])/2 if l%2==0
  @values[(l+1)/2-1]
end

#min ⇒ Object 



47
48
49
 
# File 'lib/rawk_log/stat.rb', line 47

def min
  @min
end

#standard_deviation ⇒ Object 



68
69
70
71
 
# File 'lib/rawk_log/stat.rb', line 68

def standard_deviation
  return 0 if @count<=1
  Math.sqrt((@sum_squares - (@sum*@sum/@count))/ (@count) )
end

#sum ⇒ Object 



43
44
45
 
# File 'lib/rawk_log/stat.rb', line 43

def sum
  @sum
end

#to_s(label_size = DEFAULT_LABEL_SIZE) ⇒ Object 



73
74
75
76
77
78
79
 
# File 'lib/rawk_log/stat.rb', line 73

def to_s(label_size = DEFAULT_LABEL_SIZE)
  if count > 0
    sprintf("%*s %6d %9.2f %7d %7d %7d %7d %7d",-label_size, key,count,sum,max*1000.0,median*1000.0,average*1000.0,min*1000.0,standard_deviation*1000.0)
  else
      sprintf("%*s %6d",-label_size,key,0)
  end
end