public ADDomainController GetAvailableDomainController(bool RequireWritable = false)
{
if (this.domainMaintenanceNext < DateTime.Now)
MaintainDomainControllers();
IEnumerable<ADDomainController> availableServers;
// Try Site Servers first
availableServers = AvailableDomainControllers(RequireSiteServer: true, RequireWritable: RequireWritable);
if (!availableServers.Any())
{
// No Site Servers available - try all
availableServers = AvailableDomainControllers(RequireSiteServer: false, RequireWritable: RequireWritable);
if (!availableServers.Any())
{
lock (domainMaintainLock)
{
availableServers = AvailableDomainControllers(RequireSiteServer: false, RequireWritable: RequireWritable);
if (!availableServers.Any())
return DiscoverAvailableDomainController(RequireWritable);
}
}
}
switch (availableServers.Count())
{
case 1:
// 1 Available DC
return availableServers.First();
default:
// Multiple DCs Available - Round Robin
int drr = Interlocked.Increment(ref domainControllerRoundRobin);
int dcrrValue = drr % availableServers.Count();
if (drr > availableServers.Count())
domainControllerRoundRobin = -1;
return availableServers.ElementAt(dcrrValue);
}
}
private IEnumerable<ADDomainController> AvailableDomainControllers(bool RequireSiteServer, bool RequireWritable)
