You can also have a look at Grouptabs which uses the Dojo Toolkit with its concept of data stores.
Check out
https://github.com/xMartin/grouptabs/blob/bb3c525bce7eb9df87249e63343055cdd2194d13/js/gka/store/RemoteStorageAdapter.js and https://github.com/xMartin/grouptabs/blob/7bd8355fcfd85a2763dade20c760e2e321522f5c/js/gka/app.js
The implementation is currently very simple though, maybe not following best practices…