@WorkerThread
    @Override
    public boolean addToWatchlist(@NonNull final Geocache cache) {
        final boolean added = GCParser.addToWatchlist(cache).blockingGet();
        if (added) {
            DataStore.saveChangedCache(cache);
        }
        return added;
    }
Indicates whether the given rating is acceptable (i.e. one might accept only integer values or restrict some other values)

@param rating rating given
@return true if rating is acceptable, false if not
main/src/main/java/cgeo/geocaching/connector/gc/GCConnector.java