[aerogear-dev] Data Sync Thoughts

Wed Jan 29 07:43:11 EST 2014

My 2 non technical cents, I really think we should separate "push" from
"sync" and integrate later,  bet on simple. In my opinion we are just
adding one more level of complexity.

For example: would be perfect to add digital signatures, encrypted data for
that storage and all the sick things from security. But that would add an
extra level of complexity which would lead us to several months of
development.

Is just my opinion, but if you guys think that we REALLY need Push, MVP or
whatever atm, that's fine.

On Wed, Jan 29, 2014 at 6:03 AM, Matthias Wessendorf <matzew at apache.org>wrote:

>
>
>
> 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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