Fixed issue-1600 add thread-safe protection to inputManager

[hushengyue]

Fixed issue-1600 by adding synchronized protection

[claassistantio]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #1604 into master will decrease coverage by <.01%.
The diff coverage is 75%.

@@             Coverage Diff              @@
##             master    #1604      +/-   ##
============================================
- Coverage     67.89%   67.89%   -0.01%     
  Complexity       45       45              
============================================
  Files           654      654              
  Lines         27982    27986       +4     
  Branches       4403     4404       +1     
============================================
+ Hits          18999    19000       +1     
- Misses         7155     7156       +1     
- Partials       1828     1830       +2

Impacted Files	Coverage Δ	Complexity Δ
...java/io/siddhi/core/stream/input/InputManager.java	89.47% <75%> (-4.65%)	0 <0> (ø)
...c/main/java/io/siddhi/core/util/ThreadBarrier.java	80% <0%> (-20%)	0% <0%> (ø)
.../processor/stream/window/DelayWindowProcessor.java	78.18% <0%> (-5.46%)	0% <0%> (ø)
...istence/IncrementalFileSystemPersistenceStore.java	50.96% <0%> (-0.97%)	0% <0%> (ø)
...o/siddhi/core/aggregation/IncrementalExecutor.java	80.46% <0%> (-0.79%)	0% <0%> (ø)
.../io/siddhi/core/util/snapshot/SnapshotService.java	71.63% <0%> (+1.03%)	0% <0%> (ø)	⬇️
...ore/util/persistence/InMemoryPersistenceStore.java	58.97% <0%> (+5.12%)	0% <0%> (ø)	⬇️

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[mohanvive]

Thanks for the PR @hushengyue ... We'll review and get it merged ASAP..

[mohanvive]

PR is merged. @hushengyue Thanks for your contribution. Appreciate it..