Override class member built-in type methods

[alccetinkaya]

Hello,

I have an object type with the built-in NonExclusiveLevelAlarmType type as a member. This type has Acknowledge, Enable, Disable etc. methods. I want to override its methods to apply my business logic. Since it's a class member, I couldn't find a way to override it. My question is, how is it possible to override built-in type methods in general?

Additionally, I'm using UaModuler to create objects. When I look at the NodeId namespace index of NonExclusiveLevelAlarmType members, variables are 2 (my node manager's index), but methods are 0. Is that correct?

Thanks

[Support Team]

Hi,

You can implement your business logic in the NodeManagerBase by overriding the method OnAcknowledge. The ServerGetting started tutorial shows an example for that in lesson 6.
see https://documentation.unified-automation.com/uasdkcpp/1.8.3/html/L3GettingStartedLesson06.html#L4GettingStartedLesson06_Step05

The same way you can overrride the methods Enable, Disable etc.
In OPC UA it is allowed to call a method using the Method NodeId of the Type (instead of the Method NodeId of the instance). For the ConditionTypes the generated code just creates a reference to the Acknowledge method on the type, instead of creating an additional method node for each condition instance. So yes, that is correct.

[Utkrist]

Hi,

I have a follow up question to this. For Instance, here is the signature of the method I want to override.

Code: Select all

  virtual UaStatus GetLatestResult(
        const ServiceContext& serviceContext,
        OpcUa_Int32 ResourceTimeout,
        OpcUa_UInt32& ResultHandle,
      OpcUaTi::ResultDataType& Result,
        OpcUa_Int32& Error);

I am also using UaModeler to import multiple Xml files, therefore there are multiple namespaces in the address space. I tried overriding this method on the NodeManagerBase of the final namespace (as shown by UaExpert),but I do not get the desired result. I also thought any business logic should be implemented on the NodeManager, which inherits from NodeManagerBase. Is this not true?