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Uml Process / Re: Modeling C++ exceptions

« on: February 22, 2024, 01:17:20 pm »

You're right, directly modeling C++ exceptions with Events or Signals can be challenging due to their limitations. Here are some alternative approaches you can consider:

1. State Chart with Entry/Exit Actions:

• Use a state chart to represent the normal execution flow and exceptional states.
• Define entry and exit actions for states and transitions.
• In the interruptible region (corresponding to the C++ try block), the entry action can check for exceptional conditions and trigger a transition to an "exception handling" state.
• Define multiple exit actions for the "exception handling" state, each corresponding to a different C++ catch block. These exit actions would represent the catch-body activities.
• This approach avoids the limitation of multiple instances of the same event by using state transitions and actions instead.

2. Nested Activities with Error Handling:

• Use nested activities to represent the different code blocks within the try block and potential catch blocks.
• Define an additional "error handling" activity that can be invoked from multiple locations within the nested activities.
• Pass information about the type of exception to the "error handling" activity to differentiate between different catch blocks.
• This approach leverages the hierarchical structure of activities to model the nesting of code blocks and the centralized handling of exceptions.

3. Custom Extension:

• If your modeling tool allows custom extensions, create a new element specifically for modeling C++ exceptions.
• This element could encapsulate the try, throw, and catch keywords and have internal logic to handle different exception types and corresponding actions.
• This approach provides the most direct representation of C++ exceptions but requires specific customization to your modeling tool.

Additional Tips:

• Regardless of the approach you choose, clearly document the mapping between your chosen modeling elements and the corresponding C++ constructs.
• Use labels and annotations to explain the logic behind exception handling behavior within your model.
• Consider the maintainability and scalability of your approach, especially if you have a complex model with many potential exceptions.

Remember, the best approach depends on your specific modeling tool, the complexity of your C++ code, and your personal preferences. Evaluate each option and choose the one that best suits your needs. Source: fnaf games series