grpc / grpc-java / 13657
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xds: xds load report store implementation (#5587)

* Implemented XdsCliendLoadRecorder which is a ClientStreamTracer.Factory that takes a counter and produces ClientStreamTracer aggregating the counter in callback.

* WIP: add tests for XdsLoadReportStore

* fix query count logic, use an atomic in-progress call counter instead of callsStarted with manual computation at snapshot

* make XdsLoadReportStore threadsafe

* fix class and field modifiers

* make iterating concurrentMap threadsafe

* fixed forgetting to call delegated streamClosed

* add a method to discard ClientLoadCounter for a given locality

* add test to guard interceptPickResult does not destroy original ClientStreamTracer

* added cluster wide dropCounters and method to be called to record dropped requests, tests to be added later.

* add methods for add/discard ClientLoadCounters for localities manually instead of implicitly added by interceptPickResult call. Unit tested.

* make a static noop ClientStreamTracer and ClientStreamTracer.Factory instead of creating one each every time need it

* refractor interceptPickResult

* modified ClientLoadCounter to allow continuing recording loads for localities no longer exposed by balancer while having ongoing loads

* refractor tests

* reworded method comment for calling in syncContext

* fixed issue of no setting dropCount to 0 after load reporting

* polish test

* added test coverage for recording dropped requests (not concurrent)

* added class comment for XdsClientLoadRecorder

14734 of 16971 relevant lines covered (86.82%)

0.87 hits per line

Jobs
ID Job ID Ran Files Coverage
1 13657.1 0
86.82
 Travis Job 13657.1
Source Files on build 13657
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