[Glass] Debugging exceptions (continuations are mandatory, aren't they?)

Dale Henrichs via Glass glass at lists.gemtalksystems.com
Tue Mar 1 15:02:10 PST 2016

On 03/01/2016 07:08 AM, Mariano Martinez Peck via Glass wrote:
> Hi guys,
> In my application, I have some error handler at some point (#on:do:) 
> and I kept the exception instance somewhere. Later, I would like to 
> open a Seaside debugger on it using WAGemStoneContinuationDebugger.
> I am already currently using WAGemStoneContinuationDebugger but for 
> "unhandled errors" that end up in the seaside error handler and hence 
> I create a continuation. Therefore, I end up sending 
> #initializeWithContinuation:  to WAGemStoneContinuationDebugger.
> In this case I am talking now, I only have the exception, no 
> continuation. So I tried something like this:
> | comp |
> comp := WAGemStoneContinuationDebugger new.
> comp initializeWithException: anException.
> html anchor
>      callback: [self call: comp];
>      with: 'Debug'
> The stack is indeed rendered. But the problem is that the "stack" I 
> see on it, is the stack associated to the rendering of the link... 
> (and everything before that link..that is..the rendering of the app). 
> There is nothing on the stack related to the "anException".
> To solve this, what I had to do, is to create a continuation in my 
> error handler block and store the continuation as well as the original 
> exception. And then use #initializeWithContinuation:  instead of 
> #initializeWithException:.
> Is this expected?
Yes ... WAGemStoneContinuationDebugger inherits from WAGemStoneWalkback 
and when you use #initializeWtihException: you are triggering the 
WAGemStoneWalkback behavior ... presumably there should be a 
#shouldNotImplement in 
WAGemStoneContinuationDebugger>>initializeWithException: ... bot cases 
end up sending #initializeWithContext: where all of the action happens 
... with a Exception passed in the context is created from the current 
process and with a continuation the context is created from the 
continuation ..

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