Indication subscription

Question

Hello,

I am prototyping a C# client wrapper , which is consuming the Information Service.
Right now, I'm working on Invoking verbs through the service. I tried calling the PollNow method, but is there any way to get an information about when it's done?
I want the user to be able to call PollNow once in a while, and AFTER the poll is done, send a query to get the latest information about the node (right now, i just want to know if the node is up or down).

Is there a way to subscribe to SWSQL Indications? Or is there any other way to do that?

Thank you in advance

tdanner · Accepted Answer

For this use case, I think the simplest solution would be to just query the LastSync property until it changes. Like this:

$hostname = "localhost"
$username = "admin"
$password = ""
$swis = Connect-Swis -Hostname $hostname -UserName $username -Password $password
$node = Get-SwisData $swis "SELECT TOP 1 NodeID, LastSync FROM Orion.Nodes ORDER BY LastSync DESC"
$oldSyncTime = $node.LastSync
Invoke-SwisVerb $swis Orion.Nodes PollNow @("N:" + $node.NodeID) | Out-Null
Write-Host "Invoked PollNow for node $($node.NodeID)."
Write-Host "Waiting for update..." -NoNewline
do {
    Start-Sleep -Seconds 1
    Write-Host "." -NoNewline
    $newSyncTime = Get-SwisData $swis "SELECT LastSync FROM Orion.Nodes WHERE NodeID=@nodeId" @{nodeId=$node.NodeID}
} while ($newSyncTime -eq $oldSyncTime)
Write-Host "done."
$node = Get-SwisData $swis "SELECT Caption, Status, StatusDescription FROM Orion.Nodes WHERE NodeID=@nodeId" @{nodeId=$node.NodeID}
Write-Host "Latest status for $($node.Caption) is $($node.Status) - $($node.StatusDescription)"