function()

Returns a promise that resolves to a list of Set objects contained in the connection. This is useful for querying a cacheConnection if it will be able to satisfy a request.

An example response might look like:

connection.getSets().then(function(sets){
    sets //-> [
    //   {complete: true},
    //   {userId: 5, start: 10, end: 20}
    //]
})