OPC UA 統一架構 (二)

OPC UA (二)

 

重頭戲，撈取數據，才是該干的事。想獲取數據，先有數據源DataPrivade，DataPrivade的數據集合不能和BaseDataVariableState的集合存儲同一地址，或者稱為淺副本

需要提出下面類重新設計，按照自己的idea來做

public class ReferenceNodeManager : CustomNodeManager2

UA-.NETStandard設計的數據鎖效果好，點數一多，多Client就比較卡。后來發現是Lock問題，Lock時間一長，其他Client就只能等待，目前想到的解決辦法就是深拷貝數據，盡量縮短取值時間。就是上述說的不是同一片內存空間。Server的數據和DataPrivade數據不是同一個。

private BaseDataVariableState CreateVariable(NodeState parent, string path, string name, NodeId dataType, int valueRank) { BaseDataVariableState variable = new BaseDataVariableState(parent); variable.SymbolicName = name; variable.ReferenceTypeId = ReferenceTypes.Organizes; variable.TypeDefinitionId = VariableTypeIds.BaseDataVariableType; variable.NodeId = new NodeId(path, NamespaceIndex); variable.BrowseName = new QualifiedName(path, NamespaceIndex); variable.DisplayName = new LocalizedText("en", name); variable.WriteMask = AttributeWriteMask.DisplayName | AttributeWriteMask.Description; variable.UserWriteMask = AttributeWriteMask.DisplayName | AttributeWriteMask.Description; variable.DataType = dataType; variable.ValueRank = valueRank; variable.AccessLevel = AccessLevels.CurrentReadOrWrite; variable.UserAccessLevel = AccessLevels.CurrentReadOrWrite; variable.Historizing = false; variable.Value = GetNewValue(variable); variable.StatusCode = StatusCodes.Good; variable.Timestamp = DateTime.UtcNow;

 

四、DataPrivade

a）  BaseDataVariableState 的屬性

       SymbolicName: A symbolic name for the node that is not expected to be globally unique.(節點的符號名，不應是全局唯一的。)（百度翻譯）

       NodeId:The identifier for the node.(節點的標識符)

　　BrowseName:The browse name of the node.(節點的瀏覽名稱)

　　DisplayName:The display name for the node.(節點的顯示名稱)

　　DataType:The data type for the variable value.(變量值的數據類型)

　　ValueRank:The number of array dimensions permitted for the variable value.(變量值允許的數組維數)

　　Value:The value of the variable.(變量的值)(變量：或者稱為節點)

個人認為上面屬性比較重要，加黑字體的是用到的，其他暫時沒用到。

 

 b)  數據存儲在不同區域，下面定義

 可能有的用到，有的沒用到

        #region Read
        // Real BaseDataVariableState
        public Dictionary<string, BaseDataVariableState> BaseDataVariableStateDic = new Dictionary<string, BaseDataVariableState>();  4         // temp BaseDataVariableState
        public Dictionary<string, BaseDataVariableState> BaseDataVariableStateTempDic = new Dictionary<string, BaseDataVariableState>();  6 
        // for example ***_***_*** ,OPC
        private readonly Dictionary<string, String> baseDataVariableToXXXXDic = new Dictionary<string, String>();  9         // for example ***.***.*** ,IOServer
        private Dictionary<string, String> XXXXToBaseDataVariableDic = new Dictionary<string, String>(); 11         #endregion

        #region Write
        private List<InterfaceSample.Model.ValueItem> writeDataList = new List<InterfaceSample.Model.ValueItem>(); 15         private Dictionary<string, BaseDataVariableState> baseDataVariableDicWrite = new Dictionary<string, BaseDataVariableState>(); 16         #endregion

        public InterfaceSample.OPCUADataProvide OpcuaDataPrivade = null; 19 
        private object _obj = new object(); 21         #endregion

 

 c）  獲取與設置數據Value

　　1. 定時器更新數據，不要因為數據太多卡住，多次增加線程，爭搶資源。放在了CreateAddressSpace里，在OPC UA(一)可以看到。Timer:System.Threading.Timer。

m_simulationTimer = new Timer(DoSimulation, cts, 1000, 1000); 2 

　　回調DoSimulation(TimerCallback)，cts(CancellationTokenSource cts)后面解釋，DoSimulation里要使用Change，至於為什么需要自己查，不怎么用，用的不好。

 

        private void DoSimulation(object state)  2  {  3             try
 {  5                 #region CancellationTokenSource
                var source = state as CancellationTokenSource;  7 
                if (source == null || cts == null)  9  { 10                     return; 11  } 12                 if (source.Token.IsCancellationRequested && cts.Token.IsCancellationRequested) 13  { 14                     return; 15  } 16                 else
 { 18                     if (!cts.Token.IsCancellationRequested) 19  { 20                         source = cts; 21  } 22  } 23                 #endregion

                if (m_dynamicNodes_temp == null) 26  { 27                     return; 28  } 29                 m_simulationTimer.Change(0, Timeout.Infinite); 30 
                #region
                lock (_obj) 33  { 34                     string[] strs = new string[baseDataVariableToXXXXDic.Count]; 35                     baseDataVariableToXXXXDic.Values.CopyTo(strs, 0); 36                     List<string> li = new List<string>(); 37                     foreach (var str in strs) 38  { 39                         if (source.Token.IsCancellationRequested) 40  { 41                             m_simulationTimer.Change(1000, 1000); 42                             return; 43  } 44  li.Add(str); 45  } 46                     var obsli = OpcuaDataPrivade.GetItemDatas(li); 47 
                    if (obsli == null) 49  { 50                         m_simulationTimer.Change(1000, 1000); 51                         return; 52  } 53                     for (int i = 0; i < obsli.Count; i++) 54  { 55                         if (source.Token.IsCancellationRequested) 56  { 57                             m_simulationTimer.Change(1000, 1000); 58                             return; 59  } 60                         m_dynamicNodes_temp[i].Value = obsli[i]; 61  } 62  } 63 
                #endregion

                lock (Lock) 67  { 68                     int count = 0; 69                     foreach (BaseDataVariableState variable in m_dynamicNodes_temp) 70  { 71                         if (source.Token.IsCancellationRequested) 72  { 73                             m_simulationTimer.Change(1000, 1000); 74                             return; 75  } 76 77                         if (BaseDataVariableStateDic.ContainsKey(variable.NodeId.Identifier.ToString())) 78  { 79                             m_dynamicNodes[count].Value = variable.Value; 80                             m_dynamicNodes[count].Timestamp = DateTime.UtcNow; 81                             m_dynamicNodes[count].ClearChangeMasks(SystemContext, false); 82                             ++count; 83 
 } 85  } 86                     m_simulationTimer.Change(1000, 1000); 87                     //m_simulationTimer = new Timer(DoSimulation, null, 1000, 1000);
 } 89  } 90             catch (Exception e) 91  { 92                 Utils.Trace(e, "Unexpected error doing simulation."); 93  } 94         }

 

 　　2. 一般地，Client用戶端對Value的賦值(輸入)在優先級上要高於讀取，所以CancellationTokenSource的用處體現在這。

UA-.NETStandard里的BaseDataVariableState的Write集合，自己設計的，里面能到什么OnWrite或Write之類的，直接把CustomNodeManager2的Write直接拿過來

public override void Write( OperationContext context,IList<WriteValue> nodesToWrite,IList<ServiceResult> errors)

 不整段代碼，貼插入部分，里面有前后，找的話會找到，(override不一定成功，呵)

 CheckIfSemanticsHaveChanged(systemContext, propertyState, propertyValue, previousPropertyValue);  2  }  3                     var baseNode = handle.Node as BaseDataVariableState;  4                     if(baseNode != null) nodesToWriteList.Add(baseNode);  5 
                    handle.Node.ClearChangeMasks(systemContext, false);  7 
 }  9 
                // check for nothing to do.
                if (nodesToValidate.Count == 0) 12  { 13                     return; 14                 }

 

另外的代碼，遙相呼應一下，OPC UA(一) 里的CreateAddressSpace里的Task。

 

public void WriteProcHandle(CancellationTokenSource source)  2  {  3             //CancellationTokenSource source = new CancellationTokenSource();

            while (true)  6  {  7                 Thread.Sleep(500);  8                 try
 { 10                     #region
                    lock (Lock) 12  { 13                         if (baseDataVariableDicWrite.Count > 0) 14  { 15                             foreach (var item in baseDataVariableDicWrite) 16  { 17                                 writeDataList.Add(new InterfaceSample.Model.ValueItem() { Key = baseDataVariableToRTDBDic[item.Key], Value = item.Value.Value }); 18  } 19 
 baseDataVariableDicWrite.Clear(); 21  } 22  } 23 
                    lock (_obj) 25  { 26                         if (writeDataList.Count <= 0) 27  { 28                             continue; 29  } 30 
 source.Cancel(); 32                         List<string> keys = new List<string>(); 33                         List<object> values = new List<object>(); 34                         foreach (var item in writeDataList) 35  { 36  keys.Add(item.Key); 37  values.Add(item.Value); 38  } 39 
                        if (writeDataList.Count > 0) 41  { 42  OpcuaDataPrivade.SetItemDatas(keys, values); 43  writeDataList.Clear(); 44                             cts = new CancellationTokenSource(); 45  } 46                         
 } 48 
                    #endregion

 } 52                 catch (Exception) 53  { 54                     //source = new CancellationTokenSource();
 } 56                 finally
 { 58                     if (cts.Token.IsCancellationRequested) 59  { 60                         cts = new CancellationTokenSource(); 61  } 62  } 63  } 64         }

 

大概就是這樣。UA-.NETStandard方案分享出來