OPC UA (二)

重头戏，捞取数据，才是该干的事。想获取数据，先有数据源DataPrivade，DataPrivade的数据集合不能和BaseDataVariableState的集合存储同一地址，或者称为浅副本

需要提出下面类重新设计，按照自己的idea来做

public class ReferenceNodeManager : CustomNodeManager2

UA-.NETStandard设计的数据锁效果好，点数一多，多Client就比较卡。后来发现是Lock问题，Lock时间一长，其他Client就只能等待，目前想到的解决办法就是深拷贝数据，尽量缩短取值时间。就是上述说的不是同一片内存空间。Server的数据和DataPrivade数据不是同一个。

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;
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variable.UserAccessLevel = AccessLevels.CurrentReadOrWrite;
variable.Historizing = false;
variable.Value = GetNewValue(variable);
variable.StatusCode = StatusCodes.Good;
variable.Timestamp = DateTime.UtcNow;

四、DataPrivade

a）  BaseDataVariableState 的属性

       SymbolicName: A symbolic name for the node that is not expected to be globally unique.(节点的符号名，不应是全局唯一的。)（百度翻译）

       NodeId:The identifier for the node.(节点的标识符)

　　BrowseName:The browse name of the node.(节点的浏览名称)

　　DisplayName:The display name for the node.(节点的显示名称)

　　DataType:The data type for the variable value.(变量值的数据类型)

　　ValueRank:The number of array dimensions permitted for the variable value.(变量值允许的数组维数)

　　Value:The value of the variable.(变量的值)(变量：或者称为节点)

个人认为上面属性比较重要，加黑字体的是用到的，其他暂时没用到。

 b)  数据存储在不同区域，下面定义

 可能有的用到，有的没用到

1         #region Read
2         // Real BaseDataVariableState
3         public Dictionary<string, BaseDataVariableState> BaseDataVariableStateDic = new Dictionary<string, BaseDataVariableState>();
4         // temp BaseDataVariableState
5         public Dictionary<string, BaseDataVariableState> BaseDataVariableStateTempDic = new Dictionary<string, BaseDataVariableState>();
6
7         // for example ***_***_*** ,OPC
8         private readonly Dictionary<string, String> baseDataVariableToXXXXDic = new Dictionary<string, String>();
9         // for example ***.***.*** ,IOServer
10         private Dictionary<string, String> XXXXToBaseDataVariableDic = new Dictionary<string, String>();
11         #endregion
12
13         #region Write
14         private List<InterfaceSample.Model.ValueItem> writeDataList = new List<InterfaceSample.Model.ValueItem>();
15         private Dictionary<string, BaseDataVariableState> baseDataVariableDicWrite = new Dictionary<string, BaseDataVariableState>();
16         #endregion
17
18         public InterfaceSample.OPCUADataProvide OpcuaDataPrivade = null;
19
20         private object
ad8
_obj = new object();
21         #endregion

 c）  获取与设置数据Value

　　1. 定时器更新数据，不要因为数据太多卡住，多次增加线程，争抢资源。放在了CreateAddressSpace里，在OPC UA(一)可以看到。Timer:System.Threading.Timer。

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

　　回调DoSimulation(TimerCallback)，cts(CancellationTokenSource cts)后面解释，DoSimulation里要使用Change，至于为什么需要自己查，不怎么用，用的不好。

1         private void DoSimulation(object state)
2         {
3             try
4             {
5                 #region CancellationTokenSource
6                 var source = state as CancellationTokenSource;
7
8                 if (source == null || cts == null)
9                 {
10                     return;
11                 }
12                 if (source.Token.IsCancellationRequested && cts.Token.IsCancellationRequested)
13                 {
14                     return;
15                 }
16                 else
17                 {
18                     if (!cts.Token.IsCancellationRequested)
19                     {
20                         source = cts;
21                     }
22                 }
23                 #endregion
24
25                 if (m_dynamicNodes_temp == null)
26                 {
27                     return;
28                 }
29                 m_simulationTimer.Change(0, Timeout.Infinite);
30
31                 #region
32                 lock (_obj)
33                 {
34                     string[] strs = new string[baseDataVariableToXXXXDic.Count];
35                     baseDataVariableToXXXXDic.Values.CopyTo(
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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
48                     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(900, 1000);
58                             return;
59                         }
60                         m_dynamicNodes_temp[i].Value = obsli[i];
61                     }
62                 }
63
64                 #endregion
65
66                 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
84                         }
85                     }
86                     m_simulationTimer.Change(1000, 1000);
87                     //m_simulationTimer = new Timer(DoSimulation, null, 1000, 1000);
88                 }
89             }
90             catch (Exception e)
91             {
92                 Utils.Trace(e, "Unexpected error doing simulation.");
93             }
94         }

 　　2. 一般地，Client用户端对Value的赋值(输入)在优先级上要高于读取，所以CancellationTokenSource的用处体现在这。

UA-.NETStandard里的BaseDataVariableState的Write集合，自己设计的，里面能到什么OnWrite或Write之类的，直接把CustomNodeManager2的Write直接拿过来

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

 不整段代码，贴插入部分，里面有前后，找的话会找到，(override不一定成功，呵)

1                         CheckIfSemanticsHaveChanged(systemContext, propertyState, propertyValue, previousPropertyValue);
2                     }
3                     var baseNode = handle.Node as BaseDataVariableState;
4                     if(baseNode != null) nodesToWriteList.Add(baseNode);
5
6                     handle.Node.ClearChangeMasks(systemContext, false);
7
8                 }
9
10
15b0
// check for nothing to do.
11                 if (nodesToValidate.Count == 0)
12                 {
13                     return;
14                 }

另外的代码，遥相呼应一下，OPC UA(一) 里的CreateAddressSpace里的Task。

1 public void WriteProcHandle(CancellationTokenSource source)
2         {
3             //CancellationTokenSource source = new CancellationTokenSource();
4
5             while (true)
6             {
7                 Thread.Sleep(500);
8                 try
9                 {
10                     #region
11                     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
20                             baseDataVariableDicWrite.Clear();
21                         }
22                     }
23
24                     lock (_obj)
25                     {
26                         if (writeDataList.Count <= 0)
27                         {
28                             continue;
29                         }
30
31                         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
40                         if (writeDataList.Count > 0)
41                         {
42                             OpcuaDataPrivade.SetItemDatas(keys, values);
43                             writeDataList.Clear();
44                             cts = new CancellationTokenSource();
45                         }
46
47                     }
48
49                     #endregion
50
51                 }
52                 catch (Exception)
53                 {
54                     //source = new CancellationTokenSource();
55                 }
56                 finally
57                 {
58                     if (cts.Token.IsCancellationRequested)
59                     {
60                         cts = new CancellationTokenSource();
61                     }
62                 }
63             }
64         }

大概就是这样。