updateDocument method
Implementation
void updateDocument(BroadcastDocument doc) {
final docId = doc.id;
final docData = doc.getJson();
if (docData == null) {
if (data.containsKey(docId)) {
data.remove(docId);
}
} else {
data[docId] = docData;
}
if (!shouldPersist) {
shouldPersist = true;
}
}