[Biococoa-dev] Caching the NSArray of BCSymbol

Philipp Seibel biococoa at bioworxx.com
Wed Jul 6 04:17:13 EDT 2005

Hey Charles,

Am 06.07.2005 um 00:34 schrieb Charles Parnot:

>> 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.

Do you mean, you don't want to implement a mutable version of a  
sequence class for now? I really need it, so we should build both,  
mutable and immutable sequences.


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