Use Lock decorator

[gabrielmatei]

Description of the reasoning behind the pull request (what feature was missing / how the problem was manifesting itself / what was the motive behind the refactoring)

• Locker was used in several parts of the code and a lot of duplicate code appeared

Proposed Changes

• we use the Lock decorator from erdnest

[codecov-commenter]

Codecov Report

Base: 24.90% // Head: 24.90% // No change to project coverage :thumbsup:

Coverage data is based on head (159e42d) compared to base (f4977c7). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##           development     #899   +/-   ##
============================================
  Coverage        24.90%   24.90%           
============================================
  Files                8        8           
  Lines              265      265           
  Branches            10       10           
============================================
  Hits                66       66           
  Misses             189      189           
  Partials            10       10           

Flag	Coverage Δ
unittests	24.90% <ø> (ø)

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