[metrics-bugs] #22678 [Metrics/metrics-lib]: Look into existing Java Collections classes as replacement for BlockingIteratorImpl

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#22678: Look into existing Java Collections classes as replacement for
BlockingIteratorImpl
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     Reporter:  karsten              |      Owner:  metrics-team
         Type:  enhancement          |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Metrics/metrics-lib  |    Version:
     Severity:  Normal               |   Keywords:
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 Looks like `java.util.concurrent.BlockingQueue<Descriptor>` might be a
 good replacement for our custom `BlockingIteratorImpl<Descriptor>`.  Or if
 the interface doesn't exactly match our needs (thinking of end-of-stream
 elements), maybe we can use that class internally rather than building our
 own blocking queue.  This means less code and fewer bugs.  This could
 resolve #21365.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22678>
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