Getting job results in VB.NET

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Getting job results
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If you re following along, keep in mind that your job IDs and names might be a bit different than mine. Focus on the output of Get-Job to get your job IDs and names, and substitute yours in the examples.
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One of the most important pieces of information there is the ChildJobs property, which we ll cover in just a moment. To retrieve the results from a job, use Receive-Job. Before you run this, you need to know a few things:
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You have to specify the job you want to receive results from. You can do this by job ID, job name, or by getting jobs with Get-Job and piping them to ReceiveJob. If you receive the results of the parent job, those results will include all output from all child jobs. Alternatively, you can choose to just get the results from one or more child jobs. Normally, receiving the results from a job clears them out of the job output cache, so you can t get them a second time. Specify -keep to keep a copy of the results in memory. Or, you can output the results to CliXML if you want to retain a copy to work with. The job results may be deserialized objects, which you learned about in chapter 10. That means they re a snapshot from the point in time when they were generated, and they may not have any methods that you can execute. But you can pipe the job results directly to cmdlets such as Sort-Object, Format-List, Export-CSV, ConvertTo-HTML, Out-File, and so on, if desired.
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Here s an example:
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PS C:\> receive-job -id 1 Directory: C:\Users\Administrator\Documents Mode ---d---d---d---d---d---LastWriteTime ------------11/21/2009 11:53 AM 11/21/2009 11:53 AM 4/23/2010 7:54 AM 4/23/2010 7:55 AM 11/21/2009 11:50 AM Length Name ------ ---Integration Services Script Component Integration Services Script Task SQL Server Management Studio Visual Studio 2005 Visual Studio 2008
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This is an interesting set of results. Here s a quick reminder of the command that launched this job in the first place:
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PS C:\> start-job -scriptblock { dir }
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Multitasking with background jobs
Although my shell was in the C:\ drive when I ran this, the directory in the results is C:\Users\Administrator\Documents. As you can see, even local jobs take on a slightly different context when they run, which may result in a change of location. Don t ever make assumptions about file paths from within a background job: use absolute paths to make sure you can refer to whatever files your job command may require. If I wanted the background job to get a directory of C:\, I should have run this:
PS C:\> start-job -scriptblock { dir c:\ }
When I received the results from Job1, I didn t specify -keep. If I try to get those same results again, I ll get nothing, because the results are no longer cached with the job:
PS C:\> receive-job -id 1 PS C:\>
Here s how you would force the results to stay cached in memory:
PS C:\> receive-job -id 3 -keep Index ----6542 6541 6540 6539 Time ---Oct 04 Oct 04 Oct 04 Oct 04 EntryType --------SuccessA... SuccessA... SuccessA... SuccessA... Source -----Microsoft-Windows... Microsoft-Windows... Microsoft-Windows... Microsoft-Windows... InstanceID ---------4634 4624 4672 4634 Message ------An... An... Sp... An...
11:55 11:55 11:55 11:54
Of course, you ll eventually want to free up the memory that s being used to cache the job results, and I ll cover that in a bit. But first, let s see a quick example of piping the job results directly to another cmdlet:
PS C:\> receive-job -name myremotejob | sort-object PSComputerName | Format-Table -groupby PSComputerName PSComputerName: localhost Handles ------195 237 146 1318 NPM(K) -----10 38 17 100 PM(K) ----2780 40704 3260 42004 WS(K) VM(M) ----- ----5692 30 36920 547 7192 60 28896 154 CPU(s) -----0.70 3.17 0.20 15.31 Id -484 1244 3492 476 ProcessName ----------lsm Micro... msdtc lsass PSComputerName -------------loca... loca... loca... loca...
This was the job that I started by using Invoke-Command. As always, the cmdlet has added the PSComputerName property so that I can keep track of which object came from which computer. Because I retrieved the results from the top-level job, this included all of the computers that I specified, so this command will sort them on the computer name and then create an individual table group for each computer.
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