[aerogear-dev] Data Sync Thoughts

[Summers Pittman]

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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