public <T> void putUserData(@NotNull Key<T> key, @Nullable T value) {
while (true) {
try {
if (value == null) {
ConcurrentMap<Key, Object> map = myUserMap;
if (map == null) break;
@SuppressWarnings("unchecked")
T previous = (T) map.remove(key);
boolean removed = previous != null;
if (removed) {
nullifyMapFieldIfEmpty();
}
} else {
getOrCreateMap().put(key, value);
}
break;
} catch (ConcurrentModificationException ignored) {
}
}
}
public <T> boolean replace(@NotNull Key<T> key, @Nullable T oldValue, @Nullable T newValue) {
while (true) {
try {
ConcurrentMap<Key, Object> map = getOrCreateMap();
if (oldValue == null) {
return newValue == null || map.putIfAbsent(key, newValue) == null;
}
if (newValue == null) {
boolean removed = map.remove(key, oldValue);
if (removed) {
nullifyMapFieldIfEmpty();
}
return removed;
}
return map.replace(key, oldValue, newValue);
} catch (ConcurrentModificationException ignored) {
// someone blocked modification, retry
}
}
}