function Restart-AlkamiServiceFabricApplications {
<#
.SYNOPSIS
    Restarts every microservice in the Service Fabric cluster.
.PARAMETER hostname
    A single server hostname from the target Service Fabric cluster.
#>
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory = $false)]
        [string]$hostname = "localhost",
        [Parameter(Mandatory = $false)]
        [switch]$force
    )

    $loglead = (Get-LogLeadName);

    if(!($force.IsPresent)) {
        throw "$loglead Must include -Force. You wouldn't want to run this accidentally, now would you?";
        return;
    }

    # Connect to the SF cluster.
    Connect-AlkamiServiceFabricCluster -hostname $hostname | Out-Null;

    Write-Host "$loglead Restarting all services on Service Fabric cluster at $hostname";

    # Get all of the SF nodes for the environment.
    $nodes = Get-ServiceFabricNode;

    # Identify the node type (and thus the environment) of the node we are targeting.
    if($hostname -eq "localhost") {
        $hostname = Get-FullyQualifiedServerName;
    }
    $hostnameNode = $nodes | Where-Object { ($_.NodeName -like $hostname) -or ($_.IpAddressOrFQDN -like $hostname) } | Select-Object -First 1;
    if($null -eq $hostnameNode) {
        Write-Error "$loglead Unable to determine an environment/NodeType associated with server $hostname";
        return;
    }
    if($hostnameNode.NodeType -eq "SeedNode") {
        Write-Error "$hostname is a Seed Node. Please target a worker node to bounce a specific environment.";
        return;
    }
    $nodeType = $hostnameNode.NodeType;

    Write-Verbose "$loglead Restarting services on nodes with type $nodeType";

    # Filter the nodes down to the servers in the specific environment, and nodes that are up.
    $nodes = $nodes | Where-Object { ($_.NodeType -eq $nodeType) -and ($_.NodeStatus -eq "Up") };

    # Get the unique applications deployed to each of these nodes.
    $applications = @();
    foreach($node in $nodes) {
        $applications += (Get-ServiceFabricDeployedApplication -NodeName $node.NodeName);
    }
    $applications = $applications | Select-Object -ExpandProperty ApplicationTypeName -Unique;

    if(Test-IsCollectionNullOrEmpty $applications) {
        Write-Warning "$loglead Found no applications to restart. Exiting..";
        return;
    }

    # Restart all the applications.
    Invoke-Parallel -objects $applications -arguments $hostname -numThreads 16 -script {
        param($applicationTypeName, $arguments)
        $hostname = $arguments[0];

        Restart-AlkamiServiceFabricApplication -applicationTypeName $applicationTypeName -hostname $hostname;
    };

    Write-Host "$loglead All services are restarted.";
}