Add unsetCurrentContext to ContextPropagator interface

[shijiesheng]

What changed?

• added unsetCurrentContext method to ContextPropagator

Why?

Existing ContextPropagator interface do not support context deactivation

How did you test it?

unit test

Potential risks

Release notes

Documentation Changes

[natemort]

Nit: Maybe add an assertion that this key is removed

[shijiesheng]

sure. There is actually no easy way to assert on MDC directly, so I added a counter to ensure state is cleaned.

[coveralls]

Pull Request Test Coverage Report for Build 2333

Details

• 13 of 13 (100.0%) changed or added relevant lines in 4 files are covered.
• 5 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.05%) to 61.48%

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Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/uber/cadence/internal/testservice/TestWorkflowMutableStateImpl.java	1	83.61%
src/main/java/com/uber/cadence/internal/replay/ReplayDecisionTaskHandler.java	1	87.8%
src/main/java/com/uber/cadence/internal/worker/BlockCallerPolicy.java	1	62.5%
src/main/java/com/uber/cadence/internal/worker/LocallyDispatchedActivityPollTask.java	2	39.02%

Totals
Change from base Build 2331:	0.05%
Covered Lines:	11975
Relevant Lines:	19478

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💛 - Coveralls