function Stop-ServicesInParallel {
<#
.SYNOPSIS
    Attempts to stop a list of services in parallel. It will kill the services if they do not respond in time.
#>
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$true)]
        [ValidateNotNull()]
        [array]$serviceNamestoStop,

        [Parameter(Mandatory=$false)]
        [int]$maxParallel = 30
    )

    $logLead  = (Get-LogLeadName);

    if ($maxParallel -lt 1) {
        Write-Warning "$logLead maxParallel was set to less than 1. Minimum number of threads is 1, setting maxParallel to 30";
        $maxParallel = 30;
    }

    # Define the script to stop an individual service.
    $serviceStopScript = {
        param(
            $serviceName
        )

        Write-Host "[Stop-ServicesInParallel] Stopping service $serviceName";
        $serviceStopped = Stop-AlkamiService -sName $serviceName;

        $result = @{
            Result = $serviceStopped
            ServiceName = $serviceName
        }
        return $result;
    }

    Write-Host "$loglead Stopping $($serviceNamesToStop.Count) services.";

    # Stop all the services in parallel.
    $results = Invoke-Parallel -objects $serviceNamestoStop -script $serviceStopScript -numThreads $maxParallel;

    # Figure out which services did not stop.
    $badResults = $results | Where-Object { $_.Result -eq $false };
    if(!(Test-IsCollectionNullOrEmpty $badResults)) {
        Write-Warning "$logLead $($badResults.Count) services were not successfully stopped:"
        foreach($service in $badResults) {
            Write-Warning "$logLead`t$($service.ServiceName) was not stopped.";
        }

        Write-Warning "$logLead Attempting to stop services again."
        $serviceNamestoStop = $badResults | ForEach-Object { $_.ServiceName };
        $results = Invoke-Parallel -objects $serviceNamestoStop -script $serviceStopScript -numThreads $maxParallel;
    }

    # Figure out which services did not stop (again)
    $badResults = $results | Where-Object { $_.Result -eq $false };
    if(!(Test-IsCollectionNullOrEmpty $badResults)) {
        $errorString = "$logLead Could not stop $($badResults.Count) services:";
        foreach($service in $badResults) {
            $errorString += "`n$logLead`tCould not stop $($service.ServiceName)";
        }
        Write-Error $errorString;
        return;
    }

    Write-Host "$logLead Services were successfully stopped.";
}