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by Joker_vD
1749 days ago
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So, if I understand your proposal correctly, you want to split the current 2-pronged approach "catch everything, handle what you can, re-throw what you can't wrapped in FooException" into a 3-pronged one: "catch what you believe can be handled by you or your users, handle what you can, re-throw what you can't wrapped in FooException, and the system will re-throw everything else wrapped in UnexpectedException". The difference is that if now some dependency of Foo would change drastically, the Foo's users won't be able to accidentally swallow or even see the new exceptions, those will go all the way up as UnexpectedExceptions and will draw the due attention. |
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You understand it correctly.
> if now some dependency of Foo would change drastically
The most frequent "drastic change" being writing new code and fixing bugs. It's extremely easy to widen the set of exceptions thrown by a method and zero tooling to help you with finding out what exceptions can be thrown from the code.
Say what you want about Java, but its division of throwables into errors and exceptions makes sense. Errors like stack overflow, VM faults, etc., should not be exceptions. Under this scheme, they would always propagate out of the method unwrapped. Again, .NETs predefined exception types are botched beyond repair.