Build fails because of checkstyle errors, if these are fixed i can start reviewing

Codecov Report

Merging #689 into master will increase coverage by 0.04%.
The diff coverage is 93.10%.

@@             Coverage Diff              @@
##             master     #689      +/-   ##
============================================
+ Coverage     88.18%   88.22%   +0.04%     
- Complexity      722      729       +7     
============================================
  Files            69       69              
  Lines          2513     2540      +27     
  Branches        268      269       +1     
============================================
+ Hits           2216     2241      +25     
- Misses          208      210       +2     
  Partials         89       89              

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@majst01 CI build is passing now, please review.

LGTM, can you please add a Changelog entry and a section in the MANUAL.md with an useful example ?

@majst01 Added a changelog entry and update MANUAL.md.
CI build failed because of an unrelated reason(seems like a network issue), will trigger it again after a while.

@simarpreets Thanks for your contribution !

@majst01 when are you planning to release this?

I think this is important change but can I nitpick?? What is the need for dropActionsOnQueueExhaustion boolean? I would have preferred to just have droppedActionHandler.

If droppedActionHandler is set, dropActionsOnQueueExhaustion is true. If null dropActionsOnQueueExhaustion is false. I hate having this separate flag that is meaningless.