[sugar] Collaboration in an activity

[Wade Brainerd]

That's great that you're putting collaboration into Assimilate!

When a user joins an activity, they will have a brand new activity
instance.  So there should be no merging of activity state needed.
Typically, you should just have joining users send a 'hello' message
when they establish a connection.  The host (the user who initiated
the activity) responds with the entire database.  Here is the code
from Colors!:

1. Function called when a connection finally exists.  If I am not the
initiating client (i.e. if joining), broadcast a Hello message that
the initiator will hear:

http://dev.laptop.org/git?p=activities/colors;a=blob;f=colors.py;h=c262f55e46519248418a07e3c4eed1ab4207fa09;hb=a4e299e698ea90ef8dae62e3210cc02f7c51aafc#l664

2. The handler for the Hello message.  If I am the initiating client,
respond with the entire state.

http://dev.laptop.org/git?p=activities/colors;a=blob;f=colors.py;h=c262f55e46519248418a07e3c4eed1ab4207fa09;hb=a4e299e698ea90ef8dae62e3210cc02f7c51aafc#l698

Hope this helps and feel free to ping me on IRC if you want to discuss it.

Best,
Wade

On Sat, May 17, 2008 at 12:44 PM, Urko Fernandez <tturktime at gmail.com> wrote:
> I've implemented some sort of collaboration on my activity. Code is in
> the repository
> (http://dev.laptop.org/git?p=activities/assimilate;a=summary)
>
> Whenever users are collaborating, everything works more or less, signals
> are send and received and all partners have the same content on their
> instances, but if a user goes offline, what's the best way to keep
> content in sync when she joins again the activity? Is there a way to
> store signals+data somewhere?
>
> I would like to know the best approach before I start coding anything in
> this regard, merging two async-ed activities seems a daunting task.
> Thanks again for all the help, I've ended up using D-Bus tubes to send
> the file at the beginning.
> Cheers,
>
> Urko
>
>>
>> Fyi: This is what Write does. It sends binary data over D-Bus tubes,
>> which sometimes (on the initial join, just like in your situation)
>> happens to be an entire word processing file. We never send Python
>> objects over the D-Bus tube.
>>
>>   Marc
>>
>
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