function Get-SlidingAverage {
[CmdletBinding()]
Param(
[Parameter(Mandatory,ValueFromPipeline)]
[ValidateNotNullOrEmpty()]
[array]
$InputObject
,
[Parameter(Mandatory)]
[ValidateNotNullOrEmpty()]
[string]
$Property
,
[Parameter()]
[ValidateNotNullOrEmpty()]
[int]
$Size = 5
)
Begin {
Write-Debug ('[{0}] Size of queue is <{1}>' -f $MyInvocation.MyCommand, $q.Count)
$q = New-Object -TypeName System.Collections.Queue -ArgumentList $Size
}
Process {
$InputObject | ForEach-Object {
if (-Not (Get-Member -InputObject $_ -MemberType Properties -Name $Property)) {
throw ('[{0}] Unable to find property <{1}> in input object' -f $MyInvocation.MyCommand, $Property)
}
#region Enqueue new item and trim to specified size
$q.Enqueue($_)
Write-Debug ('[{0}] Size of queue is <{1}>' -f $MyInvocation.MyCommand, $q.Count)
if ($q.Count -gt $Size) {
$q.Dequeue() | Out-Null
}
#endregion
#region Calculate average if the specified number of items is present
if ($q.Count -eq $Size) {
$q | Microsoft.PowerShell.Utility\Measure-Object -Property $Property -Average | Select-Object -ExpandProperty Average
}
#endregion
}
}
}
New-Alias -Name gsa -Value Get-SlidingAverage -Force
Get-SlidingAverage.ps1
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