A Question of legacy LVOOP

Hello to all you LVOOP guys and girls,

I have a question that seems like it should be relatively simple, but it is obvious that I don't understand what is actually happening behind the scenes of LVOOP.  What I have is two classes that inherit from the same superclass.  The super class provides basic functionality I want to maintain between the various bodies and functions cannot be overridden by children.  Now, the problem in my application where I want two classes operate in parallel - at the same time, these classes appear to be contaminating each other and producing odd results that are not ideal.  For example, I have a function that inserts an error generated by the child in an error queue (the reference to which is held by the parent company) which is then sent to an error handler, owned by the parent company.  What I find is that the error is then handled by the instance of the parent class of evil!

This behavior is normal?  Do not forget that I am using data flow programming, and all access to the two classes are on the same thread where the class is first instantiated.  If the behavior is expected, is anyway I can get around this?

Since this could be a little incomprehensible, here are some shots of what I'm talking about:

The image above is a snapshot of the two different classes child running in parallel using the same class of parent.

And here's the example I gave - a VI simple to put errors in a queue for access and manipulation by the child class:

Any thoughts would be appreciated.

Peace, Matt

Your description and images are not enough, then it will be only general, but here are a few relevant points:

  1. How do you get the Ref of the queue? If get you it by name, then both references point to the same queue, then this would be my first guess for what is your problem.

  2. You seem not understand the terminology of OBJECT-oriented programming. There is 'no instance of the parent class' - in your case you have probably two instances on your diagram, which each also inherits its behavior of the parent class (I say probably because there are any number of operations that can create instances, like a wire connection). To simplify terminology, I'd use 'object' instead of 'instance', so you have two objects.

  3. In order to better clarify this point - in this case you seem to use "instance" to refer to an object that has a specific reference to the queue (for example you want basically a behavior by reference), while LVOOP is inherently by val and it means that the memory has been allocated to an object, but that object can be quite identical to another object instance.

  4. I don't know how LVOOP you studied, but there should be some info autour (which many in the forum of LAVA OOP), as well as some courses of OR that might help (not taking them, I don't know what their level).

If this does not help, need more details, the real code preferably.

Tags: NI Software

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