[horde] explain $_prefs['activesync_multiplex'] setting in Horde 5.2

[Michael J Rubinsky]

Quoting Michael J Rubinsky <mrubinsk at horde.org>:

> Quoting Samuel Wolf <samuel at sheepflock.de>:
>
>> Hi,
>>
>> can someone explain the Horde $_prefs['activesync_multiplex']  
>> setting for me?
>
> "Multiplex" refers to multiple data sources being combined into a  
> single stream (the term originates from the telecommunications  
> industry). Previously when a user has multiple sources, like e.g.,  
> address books, that they want synchronized, we "multiplexed" all of  
> the data from the selected address books into a single address book  
> "stream" that was sent to the client. This is because, originally,  
> EAS did not support multiple sources, and even now, that it does, a  
> fair number of clients do not.
>
> In Horde 5.2, support was added to allow sending each source  
> individually, i.e., non-multiplexed. So, for clients that support it  
> (like recent iOS versions), you can see and manage each separate  
> address book separately, instead of combined together. For  
> calendars, for reasons that I won't get into here, this allows  
> allows Horde to synchronize shared (but still writable) calendars.
>
> This preference allows the user to maintain the previous behavior of  
> always combining multiple sources (activesync_multiplex == 1, the  
> default), or allowing use of multiple collections. The default was  
> set to 1 for BC reasons.
>
> Additionally, there is code in the library that attempts to detect  
> the ability of each client to use separate collections, and disable  
> them if it is known that they cannot.
>
> Hope this clears things up a bit.

*Sigh* Sorry about that. This pref is a leftover from developing that  
feature. The preference was moved to application-specific  
activesync-no-multiplex settings that operate in a similar way, but  
allow selecting the feature for each application since some clients  
only support the feature for certain collections.

-- 
mike
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