[Biococoa-dev] Caching the NSArray of BCSymbol

[Alexander Griekspoor]

I'm wondering to what extend we really need to cache the array of  
symbols, in fact when does one really need that array at all? Only if  
you ask a single position you get the symbol, in all other instances  
you don't want an array of symbols right, you want a BCSequence. So a  
subsequence -> a bcsequence is returned (again containing the char 
[]), the reverse of a BCSequence -> a bcsequence is returned etc...  
Want to display a sequence in a view -> the stringrepresentation of  
the bcsequence object is given. When would you like an array of symbols?
Alex

On 6-jul-2005, at 0:34, Charles Parnot wrote:

>> One question about design of this:  should we think about a  
>> caching policy?
>> Maybe have a boolean ivar that allows a sequence to retain its  
>> symbol array
>> at an app developer's discretion (defaults to NO, but can be  
>> manually set to
>> YES in cases where an app developer knows he'll need repeated  
>> access to
>> individual symbols).  It would let app developers make performance  
>> vs.
>> memory decisions, instead of leaving them at the framework level.
>>
>> JT
>>
>>
>
> I thought of that too initially, but more recently I thought:
> * if the sequence is immutable, the developer could cache it  
> outside of the framework, no need to do it in the framework
> * if the sequence is mutable, caching means a lot of additional  
> code to keep the array in sync for all the methods where the  
> sequence changes; which probably means we should not do it now, but  
> leave it for the future *if* the need arises.
>
> Or the developer could be smart and know better than use NSArray  
> when performance is needed ;-)
>
> charles
>
> --
> Xgrid-at-Stanford
> Help science move fast forward:
> http://cmgm.stanford.edu/~cparnot/xgrid-stanford
>
> Charles Parnot
> charles.parnot at gmail.com
>
>
>
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                     ** Alexander Griekspoor **
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              The Netherlands Cancer Institute
              Department of Tumorbiology (H4)
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