watchPoll method
Implementation
Future<HGrid> watchPoll(HClientWatch w, {bool refresh = false}) {
if (w.id == null) throw StateError("nothing subscribed yet");
if (w.isClosed) throw StateError("watch is closed");
// grid meta
var b = HGridBuilder();
b.meta.add("watchId", w.id);
b.addCol("empty");
if (refresh) {
b.meta.add("refresh");
}
// make request
return call("watchPoll", b.toGrid()).catchError((Object e) {
if (e is CallErrError) {
// any server side error is considered close
watchClose(w, send: false);
}
throw e;
});
}