public void Update(TMessage curr)
{
if (curr == null)
{
throw new ArgumentNullException(nameof(curr));
}
var key = _serializer.GetKey(curr);
lock (_snapshots.SyncRoot)
{
var prev = _snapshots.TryGetValue(key);
if (prev == null)
{
_snapshots.Add(key, _serializer.CreateCopy(curr));
}
else
{
_serializer.Update(prev, curr);
}
_dirtyKeys.Add(key);
}
}