Class: SAAL::OutlierCache

Inherits:

Object

• Object
• SAAL::OutlierCache

Defined in:

lib/outliercache.rb

Constant Summary

COMP_CACHE_SIZE =

By feeding values into this cache the outliers are identified. The cache is conservative and only flags down values that it is sure are outliers. The cache considers itself “live” when the values in the cache are all within a few percent of each other and will then flag down outliers. When the cache is not live all values will be considered good.

11

MAX_CACHE_DEVIATION =

These are conservative settings that can be made stricted if the cache is not rejecting enough values or is often not “live” Sets how close the central values have to be for the cache to be “live”

0.05

MAX_VALUE_DEVIATION =

Sets how off the read value can be from the cache median to be accepted

0.15

Instance Method Summary

• #initialize ⇒ OutlierCache constructor

  A new instance of OutlierCache.

• #live ⇒ Object
• #validate(value) ⇒ Object

Constructor Details

#initialize ⇒ OutlierCache

Returns a new instance of OutlierCache.

# File 'lib/outliercache.rb', line 18

def initialize
  @compcache = []
end

Instance Method Details

#live ⇒ Object

# File 'lib/outliercache.rb', line 22

def live
  @compcache.size == COMP_CACHE_SIZE && valid_cache
end

#validate(value) ⇒ Object

# File 'lib/outliercache.rb', line 26

def validate(value)
  ret = compare_with_cache(value)
  @compcache.shift if @compcache.size == COMP_CACHE_SIZE
  @compcache.push value
  ret
end