Question

我正在研究一个脚本，以使用BITS将Office 365 ProPlus二进制文件传输到12个单独的文件共享。我还想在屏幕上显示这些传输的进度。我的问题是，我想一次将同时进行的BITS传输限制为不超过4次。当一个作业完成时，我想开始队列中的下一个作业，并继续接收进度，直到所有作业完成。

这是我到目前为止所拥有的。我首先从此功能开始，在处于挂起状态的所有网络位置创建我的所有BITS作业。

function Start-BinaryTransfer
{
[CmdletBinding()]
param
(
    [array]$DistrictsToUpdate
)

$Source = "$BaseSource\$UpdateChannel"

if ("All" -in $DistrictsToUpdate.Split(','))
{
    foreach ($Destination in $ReposList)
    {
        Copy-Item -Path $Source -Destination $($Destination.Location + '\') -Filter { $_.PSisContainer } -Recurse -ErrorAction SilentlyContinue
        Get-ChildItem -Path $Source -Recurse | Where-Object{ $_.PSisContainer } | ForEach-Object {
            $spath = $_.FullName.Remove(0, $Source.Length + 1)
            $BITSJobs += Start-BitsTransfer -Source $Source\$spath\*.* `
                                            -Destination "$($Destination.Location)\$UpdateChannel\$spath" `
                                            -DisplayName "$($Destination.District) File Transfer" `
                                            -Description "Transferring from [$Source] to [$($Destination.Location)\$UpdateChannel]" `
                                            -Suspended
        }
    }
}

创建完所有作业后，然后尝试使用While循环一次启动4个作业，并在执行时显示进度。不幸的是，实际的行为是它将尝试一次启动所有12个作业，然后使网络资源陷入瘫痪。

While (Get-BitsTransfer | Where JobState -EQ "Suspended")
{
Get-BitsTransfer | Where JobState -EQ "Suspended" | ForEach-Object {
    for ($JobsCount = 0; $JobsCount -le 4; $JobsCount++)
    {
        if ($JobsCount -lt 4)
        {
            Resume-BitsTransfer -BitsJob $_ -Asynchronous
            Get-BitsTransfer | Where JobState -EQ "Transferring" | ForEach-Object {
                Write-Progress `
                               -Id $([math]::Abs($_.DisplayName.GetHashCode())) `
                               -Activity "$($_.DisplayName)" `
                               -Status "$($_.Description)" `
                               -CurrentOperation "$([math]::Floor($_.BytesTransferred / $_.BytesTotal * 100)) % Complete" `
                               -PercentComplete $([math]::Floor($_.BytesTransferred / $_.BytesTotal * 100))
            }
        }
      }
    }

    if (Get-BitsTransfer | Where JobState -EQ "Transferred")
    {
        Get-BitsTransfer | Where JobState -EQ "Transferred" | Complete- BitsTransfer
        $JobsCount--
    }
}

Answer 1

通过for循环，您每次运行都将$JobsCount重置为0

for ($JobsCount = 0; $JobsCount -le 4; $JobsCount++)

类似的事情应该起作用（只需对当前代码进行少量更改）：

$JobsCount = 0
While (Get-BitsTransfer | Where JobState -EQ "Suspended")
{
Get-BitsTransfer | Where JobState -EQ "Suspended" | ForEach-Object {
    # remove for-loop
        if ($JobsCount -lt 4)
        {
            $JobsCount++
            ...

您还必须修改while循环，当前，当JobState "Suspended"不再有工作时它将退出，但是您仍然必须等待{ {1}} JobState并在"Transferring"时完成。建议："Transferred"或更简单的While ((Get-BitsTransfer) -ne $null)

Answer 2

谢谢您的建议，成功了。我打算进一步完善代码，但是到目前为止，这是我目前可以使用的。

function Update-JobProgress
{
    [CmdletBinding()]
    param ()

    Get-BitsTransfer | Where-Object { ($_.JobState -EQ "Transferring") -and ($_.DisplayName -Like "*File Transfer") } | ForEach-Object {
        Write-Progress -Id $([math]::Abs($_.DisplayName.GetHashCode())) `
                       -Activity "$($_.DisplayName)" `
                       -Status "$($_.Description)" `
                       -CurrentOperation "$([math]::Floor($_.BytesTransferred / $_.BytesTotal * 100)) % Complete" `
                       #-PercentComplete $([math]::Floor($_.BytesTransferred / $_.BytesTotal * 100))
    }
}


While (Get-BitsTransfer)
{
    $JobsCount = (Get-BitsTransfer | Where-Object { ($_.JobState -ne "Suspended") -and ($_.DisplayName -Like "*File Transfer") }).Count

    Get-BitsTransfer | Where-Object JobState -EQ "Suspended" | ForEach-Object {
        if ($JobsCount -lt 4)
        {
            Resume-BitsTransfer -BitsJob $_ -Asynchronous
            $JobsCount++
        }
    }

    Update-JobProgress

    if (Get-BitsTransfer | Where-Object { ($_.JobState -EQ "Transferred") -and ($_.DisplayName -Like "*File Transfer") })
    {
        Get-BitsTransfer | Where-Object { ($_.JobState -EQ "Transferred") -and ($_.DisplayName -Like "*File Transfer") } | ForEach-Object {
            Write-Progress `
                           -Id $([math]::Abs($_.DisplayName.GetHashCode())) `
                           -Activity "$($_.DisplayName)" `
                           -Completed
            $_ | Complete-BitsTransfer
            $JobsCount--
        }
    }
}

在测试中，使用-PercentComplete开关在控制台窗口中实际显示滚动进度条时，发现不一致的结果。完成的第一份工作往往会流连忘返，并引起奇怪的视觉故障。省略开关并放弃进度条似乎可以解决问题。

Powershell将BITS一次传输限制为4

2 个答案: