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Error or Exception

Ryan Waggoner
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Joined: Jun 27, 2007
Posts: 75
I couldn't figure out which to do with my methods.
Should I use a try/catch and throw an error, or have my method throw an exception?
Jeanne Boyarsky
internet detective
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Joined: May 26, 2003
Posts: 30530
    
150

Ryan,
What should happen if the exception case occurs. Is it fatal? Then you should throw an exception. Or can you handle it? Then you should catch it and take appropriate action.


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Stan James
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Joined: Jan 29, 2003
Posts: 8791
I use two guidelines that give different answers in a bit of a balancing act:

Jeanne covered the first one: If you can't do anything with the exception, like retry the operation another way or do something else instead, just let it bubble up to the calling method. Don't code "catch, log, throw" unless you really add some value.

But! Don't expose your inner workings in the type of exception. For example if I have a data access interface that might be implemented with a database or flat files or calls to a remote partner system, I don't want the database version to throw SQLExceptions. I'd invent my own DataAccessException, catch any SQL or IO or whatever exceptions and throw only DataAccessException. That way the caller never needs to know whether I'm using a database or something else.


A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
 
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subject: Error or Exception