[aerogear-dev] how about this API for sync?

[Lucas Holmquist]

So i know with PouchDB, they do long polling when the "continuous" option is on.   they sync against couchDB
On Dec 11, 2013, at 11:24 AM, Corinne Krych <corinnekrych at gmail.com> wrote:

> Interesting link to understand 'a la couchDB':
> http://docs.couchbase.com/couchbase-lite/cbl-concepts/#introduction
> 
> that comes will iOS/Android client implementation.
> 
> ++
> Corinne
> On Dec 11, 2013, at 5:13 PM, Sebastien Blanc <scm.blanc at gmail.com> wrote:
> 
>> 
>> 
>> 
>> On Wed, Dec 11, 2013 at 4:33 PM, Lucas Holmquist <lholmqui at redhat.com> wrote:
>> wanted to dump some thoughts i was having
>> Client Side Perspective
>> 
>> let me try to dump some of the client side thoughts i have, which will probably be more javascript centric
>> 
>> 	• i see data sync as keeping DataManager stores in sync with the server side
>> 
>> 	• not sure if it makes sense without it?
>> 
>> 	• I can see using Notifier using sockJS connecting to a netty server(?) to do the "real-time" updates
>> 
>> 	• Sync should be plugable, so an existing REST application using DataManager can just add it in or turn it off easily
>> 
>> 	• the sync should have some events that the user can "listen" for, to deal with conflict/changes and such
>> 
>> 	• there is another type of sync that i'm also thinking off.
>> 
>> Since Pipeline and Datamanager are not tied to each other, do we want to think about the possiblity of "syncing" them. that is when i do a read currently on a pipe, i have to manually store the data, should that be automatic, this used to happen in the way begining of pipeline, but we removed it since we wanted to keep it modular
>> 
>> Yes, I think that makes totally sense. If you it should be automatic, well, we could configure it to be or not.  In the same spirit, I was thinking of some kind of  storeFallback option we can pass to a pipe. If we call a read on a pipe and there is no connection, we fallback automatically on the local store to retrieve the data (with some metadata/flag saying it's local data). 
>> 
>> 
>> On Dec 11, 2013, at 10:26 AM, Apostolos Emmanouilidis <aemmanou at redhat.com> wrote:
>> 
>>> apologies, just a correction. The security concern is that the database
>>> might contain data which should be NOT visible/accessible to all the
>>> clients.
>>> 
>>> On Wed, 2013-12-11 at 16:22 +0100, Apostolos Emmanouilidis wrote:
>>>> +1 for starting with an implementation similar to CouchDB. This looks
>>>> like the Offline Lock pattern where there are version stamps and a
>>>> client cannot fulfill a transaction if he has an old current version
>>>> stamp.
>>>> 
>>>> Regarding the concepts that Summers sent
>>>> https://neil.fraser.name/writing/sync/ I feel that are some Open Source
>>>> implementations of these concepts out there. 
>>>> e.g google-diff-match-patch[1]
>>>> 
>>>> And something more, there is a security parameter in the data sync
>>>> concept. The database might contain data which should be
>>>> visible/accessible to all the clients.   
>>>> 
>>>> [1]: https://code.google.com/p/google-diff-match-patch/ 
>>>> 
>>>> 
>>>> On Wed, 2013-12-11 at 10:37 +0100, Daniel Bevenius wrote:
>>>> 
>>>> 
>>>>> This conflict would the have to be handled by the client. Could we
>>>>> start out with something similar and as simple as this and evolve it? 
>>>> 
>>>> 
>>>> 
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