[aerogear-dev] Data Sync Thoughts

Wed Jan 29 03:03:20 EST 2014

On Tue, Jan 28, 2014 at 7:22 PM, Summers Pittman <supittma at redhat.com>wrote:

>  On 01/28/2014 11:11 AM, Corinne Krych wrote:
>
> I think we still need the synchronisation mode in pull mode.
>
>  How are we going to deal with this use case with simple push:
> UserA is offline update some data, then switch off his phone
> Some other users update data
> UserA open his app, he has missed some push notifications but still want
> to sync his app.
>
> That is the magic of Push systems.  He gets the messages when he comes
> online.
>
> Device A and B and Server have data with a checksum of 42.
> Device A goes offline.
> Device A changes its data and has a checksum of 64.
> Device B changes its data and has a checksum of 192.
> Device B sends the expected server checksum of 42 and its new data to the
> server.
> Server accepts B's Data, updates its checksum to 192, and sends a message
> to all Devices ( in this case just A)
>

sending the data does not work via 'mobile push' - we need something like
'real-time' for that sending;

>
> Device B and Server go on a long date, but things don't work out and they
> end up splitting the check 50/50.  Device B is annoyed because she only got
> a salad but Server got the Surf and Turf.
>
> Device A comes online and receives a message from the server.
> Device A notices the server's checksum data is a change from 42 -> 192 and
> not 42 -> 64.  Thus its copy is out of sync and fires a message to the User
> of Device A to resolve the data.
> User A resolves the data and Device A sends the merged data to the server.
> Device B gets a message of new data and updates to what the server has.
>
>
>
>  ++
> Corinne
>
>
> On 28 January 2014 17:01, Summers Pittman <supittma at redhat.com> wrote:
>
>>  On 01/28/2014 10:58 AM, Lucas Holmquist wrote:
>> > On Jan 28, 2014, at 10:54 AM, Summers Pittman <supittma at redhat.com>
>> wrote:
>> >
>> >> On 01/28/2014 10:48 AM, Lucas Holmquist wrote:
>> >>> On Jan 28, 2014, at 10:30 AM, Summers Pittman <supittma at redhat.com>
>> wrote:
>> >>>
>> >>>> On 01/28/2014 09:36 AM, Lucas Holmquist wrote:
>> >>>>> yup, this is another Data Sync thread,
>> >>>>>
>> >>>>>>  From a client side perspective, i have concerns that there is
>> still not a clear direction yet.
>> >>>>> I know there are multiple ideas floating around on what our model
>> should be,  i'm all for choice, but what about deciding on 1 model to get
>> started with.  Then later once we have this nailed down,  we can have other
>> "adapters" with different models perhaps
>> >>>> All the data model is is an envelope of sync metadata around an
>> object
>> >>>> right?
>> >>> right
>> >>>
>> >>>> We also need to think about the API and server/client protocol as
>> well.
>> >>>>
>> >>>> I think that for sync 1.0 we could focus on the following behavior
>> (it
>> >>>> worked for my demos at least)
>> >>>>
>> >>>> 1.  We have a Sync factory similar to Pipeline, Authenticator,
>> >>>> Registrar, and KeyService.
>> >>>> 2.  The Sync factory consumes/manages Synchronizer instances.
>> >>>> 3.  AG Synchronizer listens for sync messages using UnifiedPush
>> endpoints.
>> >>> i thought for a 1.0 we weren't thinking about "realtime"
>> >> When I hear realtime I think sub 100 ms updates to all clients. (think
>> >> gaming)
>> >>
>> >> What I thought we were going for was something closer to email.  The
>> >> data gets changed and at some point in the future the client knows.
>> More
>> >> specifically, the thing the ONE thing that makes sync special is it is
>> a
>> >> push instead of poll implementation.
>> > this makes sense,  but i guess it would be push when available.
>> thinking web and crappy web socket support( dang you carriers )
>>  Right.  I'm not saying lets do something complicated.  I'm saying lets
>> use GCM, iOS CM, and simple push to send notifications to tell the
>> client something.  In simplePush case it is "this data changed, get the
>> new stuff and update yourself".  In Android and iOS case it may be that
>> or it may be "here is new data".
>>
>> In general, I am fine for getting a message saying something like
>> Documents/Schedules/1/${revision}.  Then I can check my revisions, fetch
>> data if necessary, update my local data, and send any updates.  That
>> SHOULD (I think) be doable with simplepush as well right?
>>
>> >
>> >>>> 4.  AG Synchronizer sends sync messages using Pipes
>> >>>> 5.  AG Synchronizer holds local data in a store
>> >>>>
>> >>>> 6.  When AGSynchronizer gets a message it is responsible for updating
>> >>>> the Store and then notifying code listing for updates OR for
>> notifying
>> >>>> the code that an error has occurred and needs to be addressed.
>> >>>>
>> >>>> 7.  When the developer updates data in the store, the synchronizer
>> >>>> should package that data and send it to the server.  The
>> synchronizer is
>> >>>> responsible for error handling, retrying, back-off, etc.
>> >>>>
>> >>>> 8.  We should include multiple synchronizer implementations to deal
>> with
>> >>>> multiple very simple use cases which involve legacy systems. (For
>> >>>> instance polling to load static data on a schedule.)
>> >>>>
>> >>>> Thoughts? Tomatoes?
>> >>>>>
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Matthias Wessendorf

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