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confusion - unlock and delete

Makeshkumar Subramaniam

Joined: Aug 09, 2008
Posts: 21

I've just started with this URLyBird assignment. I'm implementing methods

unlock(rec, cookie) throws RecordNotFoundException,SecurityException
delete(rec, cookie) throws RecordNotFoundException,SecurityException.

i wonder what if following scenario happens.

consider the following code:

as unlock() is throwing RecordNotFoundException, I'm checking if the given recNo is valid one (using record flag) before unlocking the record(removing this record entry from lock map).

my question is: since record 10 is already deleted. when the control reaches data.unlock(10,c), RecordNotFoundException would be thrown. is it okay ?? or should I change the code as to check record-valid after unlocking, i mean removing recordNo entry from lock map?.

thanks in advance.


[URLyBird1.1.1 - > just started]
Roel De Nijs

Joined: Jul 19, 2004
Posts: 6358

My unlock-method does not contain any check to see if recNo is valid, because that makes no sense. The RecordNotFoundException is only thrown by the lock (and find) method(s).

SCJA, SCJP (1.4 | 5.0 | 6.0), SCJD
Roberto Perillo

Joined: Dec 28, 2007
Posts: 2270

Roel De Nijs wrote:My unlock-method does not contain any check to see if recNo is valid, because that makes no sense.


Makeshkumar, what you can do is verify if the record to be unlocked was locked (or, if it is in the structure that keeps the locked records - normally a Map<Long, Long>); if it wasn't, then you can throw IllegalStateException.

Cheers, Bob "John Lennon" Perillo
SCJP, SCWCD, SCJD, SCBCD - Daileon: A Tool for Enabling Domain Annotations
It is sorta covered in the JavaRanch Style Guide.
subject: confusion - unlock and delete