Eliminate beginExclusive()/endExclusive()

[climategadgets]

Background

Decision to use beginExclusive()/endExclusive() for locking comes from times before Java code existed. It was not quite applicable even when the library was in active development (early 2000s), and today it is completely obsolete; it makes the application fragile and prone to deadlocks.

Task Definition

As an Application Architect, I want to change the design so that the need to use beginExclusive()/endExclusive() pair is gone.

Acceptance Criteria

The library can be used exactly the way it is used today without beginExclusive()/endExclusive() being used.