Sync is open-source library that provides efficient real-time data synchronization between client and server. The library is written in Dart language. It uses shelf as transport layer (HTTP protocol combined with websockets) and utilizes clean_data for local data collections.
Communication protocol between client and server is based on publish - subscribe model. Server publishes data views which clients can subscribe to. After client has subscribed to a data view published by the server, sync library automagically synchronizes the clientside view with changes on the server utilizing efficient communication with the server.
Server-side, the library relies on MongoDB as persistent storage, however, other database solutions can be easily integrated with the sync library. Example of publishing a data view on the server's side:
publish('personsOlderThan24Desc', (_) {
return mongodb.collection("persons").find({"age" : {'\$gt' : 24}}).sort({"age": DESC}).limit(10);
});
Example of the code for creating a subscribtion to the view:
Subscription subscription = subscriber.subscribe("personsOlderThan24Desc");
Please see the example for more information and details.