我有脚本,可以通过start-job
启动多个正在运行的脚本块。
将一些变量/值传递给正在运行的后台脚本块的最佳方法是什么?
有一些选项,如服务代理/队列,文件等。有更轻松的方式吗?
例如,
$sb = {
$Value = $args[0] # initial value
while ($true)
{
# Get more values from caller
$Value = .....
}
}
start-job -ScriptBlock $sb -ArgumentList $initValue
# There are more values to send to the script after the script block is started.
while (moreVaulesAvailable)
{
# $sb.Value = .... newly generated values ?
}
Start-Job
启动了另一个PowerShell流程。是否有任何内置机制在PS进程之间传递值?
答案 0 :(得分:3)
您可以使用MSMQ执行此操作。 PowerShell V3附带了一个MSMQ模块。以下是如何使用MSMQ将消息传递给后台任务的示例:
$sb = {
param($queueName)
$q = Get-MsmqQueue $queueName
while (1) {
$messages = @(try {Receive-MsmqQueue -InputObject $q -RetrieveBody} catch {})
foreach ($message in $messages)
{
"Job received message: $($message.Body)"
if ($message.Body -eq '!quit')
{
return
}
}
Start-Sleep -Milliseconds 1000
"Sleeping..."
}
}
$queueName = 'JobMessages'
$q = Get-MsmqQueue $queueName
if ($q)
{
"Clearing the queue $($q.QueueName)"
$q | Clear-MsmqQueue > $null
}
else
{
$q = New-MsmqQueue $queueName
"Created queue $($q.QueueName)"
}
$job = Start-Job -ScriptBlock $sb -ArgumentList $queueName -Name MsgProcessingJob
"Job started"
$msg = New-MsmqMessage "Message1 for job sent at: $(Get-Date)"
Send-MsmqQueue -Name $q.Path -MessageObject $msg > $null
Receive-Job $job
$msg = New-MsmqMessage "Message2 for job sent at: $(Get-Date)"
Send-MsmqQueue -Name $q.Path -MessageObject $msg > $null
$msg = New-MsmqMessage "!quit"
Send-MsmqQueue -Name $q.Path -MessageObject $msg > $null
Wait-Job $job -Timeout 30
Receive-Job $job
Get-Job $job.Name
Remove-Job $job
当我运行此脚本时,我得到以下输出:
C:\PS> .\MsmqQueue.ps1
Clearing the queue private$\jobmessages
Job started
Id Name PSJobTypeName State HasMoreData Location Command
-- ---- ------------- ----- ----------- -------- -------
4 MsgProcessin... BackgroundJob Completed True localhost ...
Job received message: Message1 for job sent at: 12/15/2012 17:53:39
Sleeping...
Job received message: Message2 for job sent at: 12/15/2012 17:53:39
Sleeping...
Job received message: !quit
4 MsgProcessin... BackgroundJob Completed False localhost ...