public IServer SelectServer()
{
lock (_cluster._descriptionLock)
{
_descriptionChangedTask = _cluster._descriptionChangedTaskCompletionSource.Task;
_description = _cluster._description;
}
if (!_serverSelectionWaitQueueEntered)
{
var selectingServerEventHandler = _cluster._selectingServerEventHandler;
if (selectingServerEventHandler != null)
{
// this is our first time through...
selectingServerEventHandler(new ClusterSelectingServerEvent(
_description,
_selector,
EventContext.OperationId));
}
}
MongoIncompatibleDriverException.ThrowIfNotSupported(_description);
var connectedServers = _description.Servers.Where(s => s.State == ServerState.Connected);
var selectedServers = _selector.SelectServers(_description, connectedServers).ToList();
while (selectedServers.Count > 0)
{
var server = selectedServers.Count == 1 ?
selectedServers[0] :
__randomServerSelector.SelectServers(_description, selectedServers).Single();
IClusterableServer selectedServer;
if (_cluster.TryGetServer(server.EndPoint, out selectedServer))
{
_stopwatch.Stop();
var selectedServerEventHandler = _cluster._selectedServerEventHandler;
if (selectedServerEventHandler != null)
{
selectedServerEventHandler(new ClusterSelectedServerEvent(
_description,
_selector,
server,
_stopwatch.Elapsed,
EventContext.OperationId));
}
return(selectedServer);
}
selectedServers.Remove(server);
}
return(null);
}
public IServer SelectServer()
{
lock (_cluster._descriptionLock)
{
_descriptionChangedTask = _cluster._descriptionChangedTaskCompletionSource.Task;
_description = _cluster._description;
}
if (!_serverSelectionWaitQueueEntered)
{
var selectingServerEventHandler = _cluster._selectingServerEventHandler;
if (selectingServerEventHandler != null)
{
// this is our first time through...
selectingServerEventHandler(new ClusterSelectingServerEvent(
_description,
_selector,
EventContext.OperationId));
}
}
MongoIncompatibleDriverException.ThrowIfNotSupported(_description);
_connectedServers.Clear();
_connectedServerDescriptions.Clear();
foreach (var description in _description.Servers)
{
if (description.State == ServerState.Connected &&
_cluster.TryGetServer(description.EndPoint, out var server))
{
_connectedServers.Add(server);
_connectedServerDescriptions.Add(description);
}
}
var selectedServersDescriptions = _selector
.SelectServers(_description, _connectedServerDescriptions)
.ToList();
IServer selectedServer = null;
if (selectedServersDescriptions.Count > 0)
{
var selectedServerDescription = selectedServersDescriptions.Count == 1
? selectedServersDescriptions[0]
: __randomServerSelector.SelectServers(_description, selectedServersDescriptions).Single();
selectedServer = _connectedServers.FirstOrDefault(s => EndPointHelper.Equals(s.EndPoint, selectedServerDescription.EndPoint));
}
if (selectedServer != null)
{
_stopwatch.Stop();
_cluster._selectedServerEventHandler?.Invoke(new ClusterSelectedServerEvent(
_description,
_selector,
selectedServer.Description,
_stopwatch.Elapsed,
EventContext.OperationId));
}
return(selectedServer);
}