Тимофей Даньшин wrote:
The DatabaseManager is synchronized. If any class is to communicate with the db, it does that through the DatabaseManager. The latter just provides proxy methods. I think, that should result in classes getting the instance of the DatabaseManager only when it is no longer (or not yet) used by other classes.
But that does nothing to prevent multiple threads from performing additional concurrent actions on the database. It's not enough to just control access to the shared singleton, if the actions performed by the singleton aren't also thread-safe. All the queries, updates, etc. need thread-safety, too.
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