/// <summary>
/// Returns null, if incomplete ElementValuesCollection.
/// </summary>
/// <param name="dataList"></param>
/// <param name="elementValuesCollections"></param>
/// <returns></returns>
private ClientElementValueListItem[]? ElementValuesCallback(ClientElementValueList dataList, ElementValuesCollection elementValuesCollections)
{
ClientElementValueListItem[]? changedListItems = dataList.OnElementValuesCallback(elementValuesCollections);
if (changedListItems is not null && changedListItems.Length > 0)
{
List <ValueStatusTimestamp> changedValuesList = new List <ValueStatusTimestamp>(changedListItems.Length);
foreach (ClientElementValueListItem changedListItem in changedListItems)
{
changedValuesList.Add(changedListItem.ValueStatusTimestamp);
}
dataList.RaiseElementValuesCallbackEvent(changedListItems, changedValuesList.ToArray());
}
return(changedListItems);
}
/// <summary>
/// </summary>
/// <param name="tagValueList"></param>
/// <returns></returns>
public ClientElementValueListItem[] PollElementValuesChanges(ClientElementValueList tagValueList)
{
if (_disposed)
{
throw new ObjectDisposedException("Cannot access a disposed ClientContext.");
}
if (!ServerContextIsOperational)
{
throw new InvalidOperationException();
}
try
{
while (true)
{
var request = new PollElementValuesChangesRequest
{
ContextId = _serverContextId,
ListServerAlias = tagValueList.ListServerAlias
};
PollElementValuesChangesReply reply = _resourceManagementClient.PollElementValuesChanges(request);
SetResourceManagementLastCallUtc();
var changedItems = ElementValuesCallback(tagValueList, reply.ElementValuesCollection);
if (changedItems is not null)
{
return(changedItems);
}
}
}
catch (Exception ex)
{
ProcessRemoteMethodCallException(ex);
throw;
}
}
private async Task ReadCallbackMessagesAsync(IAsyncStreamReader <CallbackMessage> reader, CancellationToken cancellationToken)
{
while (true)
{
if (!_serverContextIsOperational || cancellationToken.IsCancellationRequested)
{
return;
}
try
{
if (!await reader.MoveNext(cancellationToken))
{
return;
}
}
//catch (RpcException e) when (e.StatusCode == StatusCode.NotFound)
//{
// break;
//}
//catch (OperationCanceledException)
//{
// break;
//}
catch
{
return;
}
if (!_serverContextIsOperational || cancellationToken.IsCancellationRequested)
{
return;
}
CallbackMessage current = reader.Current;
_callbackDispatcher.BeginInvoke(ct =>
{
if (ct.IsCancellationRequested)
{
return;
}
try
{
switch (current.OptionalMessageCase)
{
case CallbackMessage.OptionalMessageOneofCase.ContextInfo:
ContextInfo serverContextInfo = current.ContextInfo;
ServerContextInfo = serverContextInfo;
break;
case CallbackMessage.OptionalMessageOneofCase.ElementValuesCallback:
ElementValuesCallback elementValuesCallback = current.ElementValuesCallback;
ClientElementValueList datalist = GetElementValueList(elementValuesCallback.ListClientAlias);
ElementValuesCallback(datalist, elementValuesCallback.ElementValuesCollection);
break;
case CallbackMessage.OptionalMessageOneofCase.EventMessagesCallback:
EventMessagesCallback eventMessagesCallback = current.EventMessagesCallback;
ClientEventList eventList = GetEventList(eventMessagesCallback.ListClientAlias);
EventMessagesCallback(eventList, eventMessagesCallback.EventMessagesCollection);
break;
case CallbackMessage.OptionalMessageOneofCase.LongrunningPassthroughCallback:
LongrunningPassthroughCallback longrunningPassthroughCallback = current.LongrunningPassthroughCallback;
LongrunningPassthroughCallback(longrunningPassthroughCallback);
break;
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Callback message exception.");
}
});
}
}
