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removed unnecessary variable 'numberOfElementsInWindow' and just used window.Len() instead

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This commit is contained in:
Pradyumna Kaushik 2016-12-20 15:03:43 -05:00 • committed by Renan DelValle
parent bf6c5eded9
commit 9b5ac0bfa8
1 changed files with 4 additions and 9 deletions
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13
utilities/runAvg/runAvg.go
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@ -22,19 +22,17 @@ type runningAverageCalculator struct {
window list.List
windowSize int
currentSum float64
numberOfElementsInWindow int
}
// singleton instance
var racSingleton *runningAverageCalculator
// return single instance
func getInstance(curSum float64, n int, wSize int) *runningAverageCalculator {
func getInstance(curSum float64, wSize int) *runningAverageCalculator {
if racSingleton == nil {
racSingleton = &runningAverageCalculator {
windowSize: wSize,
currentSum: curSum,
numberOfElementsInWindow: n,
}
return racSingleton
} else {
@ -49,9 +47,8 @@ func getInstance(curSum float64, n int, wSize int) *runningAverageCalculator {
// Compute the running average by adding 'data' to the window.
// Updating currentSum to get constant time complexity for every running average computation.
func (rac *runningAverageCalculator) calculate(data Interface) float64 {
if rac.numberOfElementsInWindow < rac.windowSize {
if rac.window.Len() < rac.windowSize {
rac.window.PushBack(data)
rac.numberOfElementsInWindow++
rac.currentSum += data.Val()
} else {
// removing the element at the front of the window.
@ -75,7 +72,6 @@ func (rac *runningAverageCalculator) removeFromWindow(id string) (interface{}, e
if elementToRemove := element.Value.(Interface); elementToRemove.ID() == id {
rac.window.Remove(element)
rac.currentSum -= elementToRemove.Val()
rac.numberOfElementsInWindow--
return elementToRemove, nil
}
}
@ -84,7 +80,7 @@ func (rac *runningAverageCalculator) removeFromWindow(id string) (interface{}, e
// Taking windowSize as a parameter to allow for sliding window implementation.
func Calc(data Interface, windowSize int) float64 {
rac := getInstance(0.0, 0, windowSize)
rac := getInstance(0.0, windowSize)
return rac.calculate(data)
}
@ -102,12 +98,11 @@ func Remove(id string) (interface{}, error) {
func Init() {
// checking to see if racSingleton needs top be instantiated
if racSingleton == nil {
racSingleton = getInstance(0.0, 0, 0)
racSingleton = getInstance(0.0, 0)
}
// Setting parameters to default values. Could also set racSingleton to nil but this leads to unnecessary overhead of creating
// another instance when Calc is called.
racSingleton.window.Init()
racSingleton.windowSize = 0
racSingleton.currentSum = 0.0
racSingleton.numberOfElementsInWindow = 0
}