On Oct 1, 2009, at 8:02 PM, Mariano Martinez Peck wrote:
Hi folks: First of all I have to say I am pretty sad that error handling hasn't a special place in the PBE. In my opinion having a good error handling is a MUST in every piece of code. We need to use exceptions. I didn't collaborate at all with PBE so I cannot say anything to no one :) I will try to write something for the next version if you want. But first...
there is a chapter for the volume two. It is already written and was rewritten we will release it in the future for making the unpatient happy.
We need a better error handling. It is very common to have a hierarchy of exceptions or errors. You have subclasses of Error for example. And many times, you want to do or not to do or even do something different depending on the error you got. Now, the question is, how you do this in Squeak ???
have a look at the Exceptions test because they encode the rich exception mechanism of Smalltalk. I could send the exception chapter too :)
This is the only (ugly) way I find to do it:
[ a block of code where you do something that can singal different exceptions ] on: XXXErrror do: [ : ex | ex class = XXXError if True: [ 'I do what I need to do when I get the error XXX' ]. ex class = YYYError if True: [ 'I do what I need to do when I get the error YYY' ]. 'here I do in the rest of the cases' ]
But, I would like to have something like this:
[ a block of code where you do something that can singal different exceptions ] on: XXXError do: [ : ex | 'I do what I need to do when I get the error XXX' ] on: YYYError do: [ : ex | 'I do what I need to do when I get the error YYY' ] on: Error do: [ : ex | 'here I do in the rest of the cases' ] ensure: [ 'Here I do what I always need to do, no matter if there is an error or not' ]
What do you think about this? does someone ever did something like this ? perhaps we can put this as part of 1.1
I listen opinions.
Best,
Mariano _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project