[Chandler-dev] Chandler as CalDAV client

[Grant Baillie]

I think 3) is the most sensible, too. Since the EIM records were  
written with iCalendar in mind, I'm hoping that it's not going to be  
too nasty to implement, but I haven't dived into any EIM code lately.

--Grant

On 13 Feb, 2007, at 16:43, Morgen Sagen wrote:

> As you know, we've been rewriting most of the sharing code to use a  
> new sharing model (External Information Model, or EIM), a new  
> protocol (Morsecode), and a new serialization format (EIMML).  Of  
> course, Chandler needs to remain a CalDAV client, and so we have at  
> least three options:
>
> 1) Continue to maintain the old CalDAV code by ripping out the old  
> XML fork which makes use of the .chandler subdirectory in the  
> CalDAV collection on the server, and keep using the repository's  
> view-time-travel feature to merge in changes, or...
>
> 2) Use a slightly modified version of (1) which doesn't use view- 
> time-travel, but rather puts the responsibility for merging and  
> detecting conflicts on the calendar code, or...
>
> 3) Use a more modified version of the ICalendar code but *on top*  
> of the EIM-based sharing layer.  There would be a new layer which  
> takes an icalendar body and breaks it down into EIM records, and  
> vice versa.  Those EIM records could then be diffed and merged and  
> participate in conflict resolution.
>
> The huge problem with (1) and (2) is that they don't leverage the  
> merging and conflict resolution work that EIM handles, and  
> therefore we would have two different sharing worlds within Chandler.
>
> I think if we take the (3) approach, in the future other developers  
> can add on their own conduits which produce and consume EIM records  
> and thereby get merging and conflict handling for free.
>
> So I think we need to do (3), I just don't know yet how much work  
> that is.
>
> ~morgen
>
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