[clug-progsig] Keeping Status

[Shawn]

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Related to this:  How can I tell when all the async processing has been
done??  (I think I can see a couple ways to determine this, but it's
SOOO closely related, I thought I'd see what you have to say.. :)

Shawn

Shawn wrote:
> This weeks challenge... :)
> 
> I have a number of objects, some of which will work asynchronously, and
> almost all of them can have different states at any given time while
> processing is happening.  I need to be able to display the "current"
> status, but the asynch and multi state issues are causing grief.
> 
> So, I'm looking for ideas.
> 
> The model is something like this:
> 
> objectA
> objectA.arrayB (contains objectB's)
> 
> objectB
> objectB.objectC
> objectB.arrayD (contains objectD's)
> 
> objectC
> objectC.arrayE
> 
> objectD
> objectD.arrayE (yes, same type of object as objectC's array)
> 
> So, when objectA loads, it get's it's list of objectBs.
> Then each objectB is told to get it's data, and so on.
> 
> Each object is operating asynchronously.  So, I can't just set a global
> status flag.  (objectX might still be loading, but objectY may have
> cleared the status, which is not indicative of what's really happening
> at that point in time).
> 
> I've tried to give each object a "state" queue, which is a simple array
> of messages and timestamps.  Then objectA displays the latest "state" as
> it's status, and each time a state is changed, it calls the routine to
> redetermine the current state.  Unfortunately this isn't working well.
> 
> I thought about using an observer pattern, but am not quite sure that's
> the right answer here, and it could have substantial impact on the code.
>  (seeing as it wasn't written with an explicit pattern approach)
> 
> I've been trying to resolve this for the past 4 hours, and I can't help
> but fell my approach is just wrong.  So I'm looking for alternatives.
> Any suggestions are appreciated.
> 
> Shawn
> 
> (NOTE:  the above problem has been highly simplified for the purpose of
> posting here.  In some ways it's not quite as complex, and in other ways
> it's MUCH MUCH more complex... :)
> 
> 
> 
> 
> 

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