Mongo - Query object: why are sort() & fields() synchronized?

[johannz]

In the Query Object, why do the sort() and fields() methods synchronize on this?

On first read, it looks like this class is not thread-safe, since the criteria are stored in a LinkedHashMap, and the addCriteria() method is not synchronized.

So why are we incurring the overhead of synchronization on these 2 methods?

[johannz]

Created https://jira.springsource.org/browse/DATAMONGO-305 to track this