internal/dynamicparams/session.ps1

#region Initialize Cache
if (-not [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Cache["session"]) {
    [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Cache["session"] = @{ }
}
#endregion Initialize Cache

#region Tepp Data return
$ScriptBlock = {
    param (
        $commandName,

        $parameterName,

        $wordToComplete,

        $commandAst,

        $fakeBoundParameter
    )

    $start = Get-Date
    [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Scripts["session"].LastExecution = $start

    $server = $fakeBoundParameter['SqlInstance']

    if (-not $server) {
        $server = $fakeBoundParameter['Source']
    }

    if (-not $server) {
        $server = $fakeBoundParameter['ComputerName']
    }

    if (-not $server) { return }

    try
    {
        [DbaInstanceParameter]$parServer = $server | Select-Object -First 1
    }
    catch
    {
        [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Scripts["session"].LastDuration = (Get-Date) - $start
        return
    }

    if ([Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Cache["session"][$parServer.FullSmoName.ToLower()])
    {
        foreach ($name in ([Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Cache["session"][$parServer.FullSmoName.ToLower()] | Where-DbaObject -Like "$wordToComplete*"))
        {
            New-DbaTeppCompletionResult -CompletionText $name -ToolTip $name
        }
        [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Scripts["session"].LastDuration = (Get-Date) - $start
        return
    }

    try
    {
        $serverObject = Connect-SqlInstance -SqlInstance $parServer -SqlCredential $fakeBoundParameter['SqlCredential'] -ErrorAction Stop
        foreach ($name in ([Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Cache["session"][$parServer.FullSmoName.ToLower()] | Where-DbaObject -Like "$wordToComplete*"))
        {
            New-DbaTeppCompletionResult -CompletionText $name -ToolTip $name
        }
        [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Scripts["session"].LastDuration = (Get-Date) - $start
        return
    }
    catch
    {
        [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Scripts["session"].LastDuration = (Get-Date) - $start
        return
    }
}

Register-DbaTeppScriptblock -ScriptBlock $ScriptBlock -Name session
#endregion Tepp Data return

#region Update Cache
$ScriptBlock = {

    $SqlConn = $server.ConnectionContext.SqlConnectionObject
    $SqlStoreConnection = New-Object Microsoft.SqlServer.Management.Sdk.Sfc.SqlStoreConnection $SqlConn
    $XEStore = New-Object  Microsoft.SqlServer.Management.XEvent.XEStore $SqlStoreConnection
    $xesessions = $XEStore.sessions
    [Sqlcollaborative.Dbatools.TabExpansion.TabExpansionHost]::Cache["session"][$FullSmoName] = $xesessions.Name
}
Register-DbaTeppInstanceCacheBuilder -ScriptBlock $ScriptBlock
#endregion Update Cache