[OpenLayers-Dev] vector behavior

[Tim Schaub]

Christopher Schmidt wrote:
> On Mon, Apr 14, 2008 at 05:46:47PM -0600, Tim Schaub wrote:
>> Hey-
>>
>> Some may have already seen the proposal for new vector layer behavior.
>> http://trac.openlayers.org/wiki/Proposal/VectorBehavior
>>
>> This week, I'll be working on implementing a bit of this new design. 
>> I'm focussed on an AtomPub protocol, an Atom format, and a somewhat 
>> smartish BBOX strategy.
> 
> Thanks for the email letting us know what's up.
> 
> Out of curiosity: some Protocols seem likely to be 'trapped' within a
> single Format. I'm assuming that you don't see any problem with that, so
> long as it is sufficiently documented. I'm asking only because the
> majority of protocols seem to clearly be in a position where they'll be 
> able to cope with many formats -- WFS read support, AtomPub support,
> etc. -- while a minority -- ESRI-REST, WFS-T/write, etc. -- are tied to
> a specific Format. Does this make sense? Is a format-specific protocol
> still a protocol? (I think yes.) 

Yeah, this seems unavoidable.

After a bit of discussion with Eric this morning, we came up with a 
cleaner design.  A protocol knows only about format (not layer).  A 
strategy knows about layer.  A strategy can be used to trigger requests 
with a format - and the strategy supplies callbacks.  In the case of 
read, the strategy callback expects to receive a list of features.

All a moving target at this point.  Good to have discussion on what 
things should look like.

Tim

> 
>> I've started putting stuff up in an "almanac" sandbox.  The one example 
>> that shows it wired together is not that impressive - but it represents 
>> a new design for giving vector layers behavior.
>>
>> http://dev.openlayers.org/sandbox/topp/almanac/examples/vector2.html
>>
>> I appreciate any ideas on the work.  I've got a deadline to get this 
>> working by next Monday - so it will be hasty work for a while.
>>
>> http://trac.openlayers.org/log/sandbox/topp/almanac/
> 
> I'm assuming that in the meantime you'd primarily like committing to be
> held to topp people without prior discussion: I'm hacking a bit in SVK,
> and when you guys pass your deadline, I hope to have some code
> (unrelated to your current work) to toss back in the sandbox, so looking
> forward to helping from afar in the meantime.
> 
> Regards,