/// <summary>
/// No throw. Returns null or changed clientObjs (not null, but possibly zero-lenghth).
/// </summary>
public object[]? PollChanges()
{
if (XiList is null || XiList.Disposed)
{
return(null);
}
if (XiList.Pollable)
{
try
{
var changedClientObjs = new List <object>();
IXiDataListItem[] changedXiDataListItems = XiList.PollDataChanges();
foreach (IXiDataListItem xiDataListItem in changedXiDataListItems)
{
var o = xiDataListItem.Obj as XiListItemWrapper;
if (o is null)
{
throw new InvalidOperationException();
}
foreach (var modelItem in o.ClientObjectInfosCollection)
{
if (modelItem.ClientObj is not null)
{
changedClientObjs.Add(modelItem.ClientObj);
}
}
}
return(changedClientObjs.ToArray());
}
catch
{
}
}
return(null);
}
/// <summary>
/// Invokes XiList.PollDataChanges() if XiList Pollable and not Callbackable.
/// No throw.
/// </summary>
public void PollChangesIfNotCallbackable()
{
if (XiList is null || XiList.Disposed)
{
return;
}
if (XiList.Pollable && !XiList.Callbackable)
{
try
{
XiList.PollDataChanges();
}
catch
{
}
}
}
public void Write(object clientObj, ValueStatusTimestamp valueStatusTimestamp)
{
if (XiList is null || XiList.Disposed)
{
return;
}
ClientObjectInfo?modelItem;
if (!ClientObjectInfosDictionary.TryGetValue(clientObj, out modelItem))
{
return;
}
if (modelItem.XiListItemWrapper is null || modelItem.XiListItemWrapper.XiListItem is null || modelItem.XiListItemWrapper.XiListItem.ResultCode != XiFaultCodes.S_OK)
{
return;
}
IXiDataListItem xiDataListItem = modelItem.XiListItemWrapper.XiListItem;
try
{
xiDataListItem.PrepareForWrite(valueStatusTimestamp);
try
{
XiList.CommitWriteDataListItems();
}
catch
{
}
}
catch (Exception ex)
{
Logger?.LogWarning(ex, "Exception");
}
}
/// <summary>
/// Creates List, adds/removes items.
/// No throw.
/// </summary>
public void Subscribe(XiServerProxy xiServerProxy)
{
try
{
if (!XiItemsMustBeAddedOrRemoved)
{
return;
}
bool firstTimeDataJournalConnection = (XiList is null);
if (firstTimeDataJournalConnection)
{
try
{
if (xiServerProxy.ContextExists)
{
XiList = xiServerProxy.NewDataJournalList(0, 0, null);
}
}
catch (Exception)
{
}
}
if (XiList is null || XiList.Disposed)
{
return;
}
bool connectionError = SubscribeInitial();
try
{
if (!connectionError && XiList is not null && !XiList.Disposed)
{
if (firstTimeDataJournalConnection)
{
try
{
XiList.Readable = true;
}
catch
{
}
}
XiList.EnableListUpdating(true);
}
}
catch (Exception ex)
{
Logger?.LogWarning(ex, "Exception");
connectionError = true;
}
if (!connectionError)
{
XiItemsMustBeAddedOrRemoved = false;
}
}
finally
{
SubscribeFinal();
}
}
/// <summary>
/// Returns clientObjs whose write failed.
/// If connection error, no throw and returns all clientObjs.
/// </summary>
/// <param name="clientObjs"></param>
/// <param name="valueStatusTimestamps"></param>
/// <returns></returns>
public object[] Write(object[] clientObjs, ValueStatusTimestamp[] valueStatusTimestamps)
{
if (XiList is null || XiList.Disposed)
{
return(clientObjs);
}
int i = -1;
var result = new List <object>();
foreach (var clientObj in clientObjs)
{
i++;
ClientObjectInfo?modelItem;
if (!ClientObjectInfosDictionary.TryGetValue(clientObj, out modelItem))
{
result.Add(clientObj);
continue;
}
if (modelItem.XiListItemWrapper is null ||
modelItem.XiListItemWrapper.XiListItem is null ||
modelItem.XiListItemWrapper.XiListItem.ResultCode != XiFaultCodes.S_OK)
{
result.Add(clientObj);
continue;
}
IXiDataListItem xiDataListItem = modelItem.XiListItemWrapper.XiListItem;
xiDataListItem.PrepareForWrite(valueStatusTimestamps[i]);
}
IEnumerable <IXiDataListItem>?failedItems = null;
try
{
failedItems = XiList.CommitWriteDataListItems();
}
catch
{
return(clientObjs);
}
if (failedItems is not null)
{
foreach (var xiDataListItem in failedItems)
{
var o = xiDataListItem.Obj as XiListItemWrapper;
if (o is null)
{
throw new InvalidOperationException();
}
foreach (var modelItem in o.ClientObjectInfosCollection)
{
if (modelItem.ClientObj is not null)
{
result.Add(modelItem.ClientObj);
}
}
}
}
return(result.ToArray());
}
/// <summary>
/// Creates List, adds/removes items.
/// No throw.
/// </summary>
/// <param name="xiServerProxy"></param>
/// <param name="сallbackDoer"></param>
/// <param name="elementValuesCallbackEventHandler"></param>
/// <param name="callbackable"></param>
/// <param name="ct"></param>
public void Subscribe(XiServerProxy xiServerProxy, IDispatcher?сallbackDoer,
ElementValuesCallbackEventHandler elementValuesCallbackEventHandler, bool callbackable, CancellationToken ct)
{
try
{
if (ct.IsCancellationRequested)
{
return;
}
if (!XiItemsMustBeAddedOrRemoved)
{
return;
}
bool firstTimeDataConnection = (XiList is null);
if (firstTimeDataConnection)
{
try
{
if (xiServerProxy.ContextExists)
{
XiList = xiServerProxy.NewDataList(0, 0, null);
}
}
catch (Exception)
{
}
}
bool connectionError = SubscribeInitial();
try
{
if (!connectionError && XiList is not null && !XiList.Disposed)
{
if (firstTimeDataConnection)
{
XiList.ElementValuesCallback +=
(IXiDataListProxy dataList, IXiDataListItem[] items,
ValueStatusTimestamp[] values) =>
{
var changedClientObjs = new List <object>(items.Length);
var changedValues = new List <ValueStatusTimestamp>(items.Length);
int i = 0;
foreach (IXiDataListItem xiDataListItem in items)
{
var o = xiDataListItem.Obj as XiListItemWrapper;
if (o is null)
{
throw new InvalidOperationException();
}
foreach (var modelItem in o.ClientObjectInfosCollection)
{
modelItem.ForceNotifyClientObj = false;
if (modelItem.ClientObj is not null)
{
changedClientObjs.Add(modelItem.ClientObj);
changedValues.Add(values[i]);
}
}
i++;
}
if (ct.IsCancellationRequested)
{
return;
}
Logger?.LogDebug("XiList.ElementValuesCallback");
if (сallbackDoer is not null)
{
try
{
сallbackDoer.BeginInvoke(ct =>
{
Logger?.LogDebug("XiList.ElementValuesCallback dispatched");
elementValuesCallbackEventHandler(changedClientObjs.ToArray(), changedValues.ToArray());
});
}
catch (Exception)
{
}
}
};
if (callbackable)
{
try
{
XiList.Callbackable = true;
}
catch
{
}
}
try
{
XiList.Pollable = true;
}
catch
{
}
try
{
XiList.Readable = true;
}
catch
{
}
try
{
XiList.Writeable = true;
}
catch
{
}
XiList.EnableListUpdating(true);
}
XiList.EnableListElementUpdating(true, null);
}
}
catch (Exception ex)
{
Logger?.LogWarning(ex, "Exception");
connectionError = true;
}
{
var utcNow = DateTime.UtcNow;
var changedClientObjs = new List <object>();
var changedValues = new List <ValueStatusTimestamp>();
foreach (XiListItemWrapper xiListItemWrapper in XiListItemWrappersDictionary.Values)
{
foreach (var modelItem in xiListItemWrapper.ClientObjectInfosCollection)
{
if (modelItem.ForceNotifyClientObj)
{
modelItem.ForceNotifyClientObj = false;
if (modelItem.ClientObj is not null)
{
if (xiListItemWrapper.ItemDoesNotExist)
{
changedClientObjs.Add(modelItem.ClientObj);
changedValues.Add(new ValueStatusTimestamp {
ValueStatusCode = ValueStatusCode.ItemDoesNotExist
});
}
else if (xiListItemWrapper.XiListItem is not null)
{
changedClientObjs.Add(modelItem.ClientObj);
changedValues.Add(xiListItemWrapper.XiListItem.ValueStatusTimestamp);
}
else
{
changedClientObjs.Add(modelItem.ClientObj);
changedValues.Add(new ValueStatusTimestamp(new Any(), ValueStatusCode.Unknown, utcNow));
}
}
}
}
}
if (changedClientObjs.Count > 0)
{
if (ct.IsCancellationRequested)
{
return;
}
if (сallbackDoer is not null)
{
try
{
сallbackDoer.BeginInvoke(ct =>
elementValuesCallbackEventHandler(changedClientObjs.ToArray(), changedValues.ToArray()));
}
catch (Exception)
{
}
}
}
}
if (!connectionError)
{
XiItemsMustBeAddedOrRemoved = false;
}
}
finally
{
SubscribeFinal();
}
}