[tor-bugs] #19607 [Metrics/metrics-lib]: avoid repeated keyword strings

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#19607: avoid repeated keyword strings
---------------------------------+-----------------------------------
 Reporter:  iwakeh               |          Owner:  karsten
     Type:  enhancement          |         Status:  needs_review
 Priority:  Medium               |      Milestone:  metrics-lib 1.7.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by iwakeh):

 Replying to [comment:8 karsten]:
 > Looks good!
 >
 > Just one question/suggestion: what do you think about moving
 `serverAtMostOnce` and other parts that are only relevant for parsing
 server descriptors to `ServerDescriptorImpl`?

 My reasoning was: if a new field is added in `Key` the sets for at-most,
 exactly, etc. are immediately in sight and the new key could be added to
 the appropriate set(s).  But, I don't feel strongly about it; just had to
 make a choice while coding.

 >
 > Other than that, I'm not entirely sure what you mean by "additional
 lines will go away" in your comment above.  Which lines do you mean?

 Sounds a little cryptic :-) The lines listed as new in the git stats.  I'm
 referring to `protected void check*Keywords(Set<String> keywords)`
 methods, which could be replaced by `protected void check*Keys(Set<Key>
 keys)` eventually.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19607#comment:9>
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