如何并行运行 Powershell 函数的多个实例？

Question

下面是我在文件中的函数

streamMonitor.ps1

。

function streamMonitor {
    [cmdletbinding()]
    param(
      [string]$directoryPath,
      [string]$scriptToRestartPath
    )

    while ($true) {
        Write-Host "Monitoring directory: $directoryPath"
        Write-Host "Script to restart: $scriptToRestartPath"

        # Get the current time
        $currentTime = Get-Date

        # Get the latest creation time of any file in the directory
        $latestCreationTime = Get-ChildItem -Path $directoryPath -Recurse |
          Where-Object { !$_.PSIsContainer } |
            Sort-Object CreationTime -Descending |
              Select-Object -First 1 |
                ForEach-Object { $_.CreationTime }

        # Ensure $latestCreationTime is not $null
        if ($null -eq $latestCreationTime) {
            Write-Host "No files found in the directory."
            return
        }

        # Check if the latest write time is within the last 30 seconds
        $timeDifference = New-TimeSpan -Start $latestCreationTime -End $currentTime
        if ($timeDifference.TotalSeconds -gt 30) {

            # No changes in the last 30 seconds, restart the specified script
            Write-Host "No changes detected within the last 30 seconds. Restarting script..."
            Start-Process -FilePath "cmd.exe" -ArgumentList "/c `"$scriptToRestartPath`"" -NoNewWindow
        } else {
            Write-Host "Changes detected within the last 30 seconds. No action taken."
        }

        Start-Sleep -Seconds 30
        continue
    }
}

我的streamMonitor功能工作正常，所以我很困惑问题是什么。

一个名为

invokingStream.ps1

的不同文件，我想在其中调用该函数的多个实例。

为了让这些作业并行运行，我需要更改什么？

当我运行此文件时，没有任何反应，它只是完成了该过程。然而，对于它正在调用的函数，它应该无限期地运行。

我正在运行 PS 5.1

#Invoking Functions in Parallel
$job1 = Start-Job -ScriptBlock { 
    . C:\pathto\streamMonitor.ps1
    streamMonitor -directoryPath "C:\pathto\stream1" -scriptToRestartPath "C:\pathto\stream1.bat"
}

$job2 = Start-Job -ScriptBlock { 
    . C:\pathto\streamMonitor.ps1
    streamMonitor -directoryPath "C:\pathto\stream2" -scriptToRestartPath "C:\pathto\stream2.bat"
}

$job3 = Start-Job -ScriptBlock { 
    . C:\pathto\streamMonitor.ps1
    streamMonitor -directoryPath "C:\pathto\stream3" -scriptToRestartPath "C:\pathto\stream3.bat"
}

Answer 1

您的代码中缺少的东西是阻塞启动作业的线程，否则，您的脚本在调用它们后立即结束，因此作业也结束。您可以使用

Receive-Job -Wait

来实现此目的，它还允许您将

Write-Host

输出返回到主线程。

$streamMonitor = @(
    @{
        directoryPath       = 'C:\pathto\stream2'
        scriptToRestartPath = 'C:\pathto\stream2.bat'
    }
    @{
        directoryPath       = 'C:\pathto\stream3'
        scriptToRestartPath = 'C:\pathto\stream3.bat'
    }
    @{
        directoryPath       = 'C:\pathto\stream1'
        scriptToRestartPath = 'C:\pathto\stream1.bat'
    }
)

$streamMonitor | ForEach-Object {
    Start-Job {
        . C:\pathto\streamMonitor.ps1
        streamMonitor @using:_
    }
} | Receive-Job -Wait -AutoRemoveJob