Many distributed databases do not support the MySQL
get_lock() function. In order to be able to support alternative databases in the future we need to abstract the use of
get_lock() to the configured PDO adapter.
Instead of calling
get_lock() directly all code should call a new
getLock() method on the current PDO adapter which will allow locking to be handled differently for each database type. All Matomo PDO adapters should be implementing
core/Db/AdapterInterface which can contain the new abstract method definition.
This should not change locking behavior for MySQL in any way.