Zero-check PDH counter and instance lists, add English index lookup #988
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dbwiddis
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| // Can't allocate 0 memory | ||
| if (pcchCounterListLength.getValue().intValue() < 1 || pcchInstanceListLength.getValue().intValue() < 1) { | ||
| return counters; | ||
| } |
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Is it possible, that only one of the lists has content? I would special case the 0-elements case and replace the memory with a null pointer. From my experience that is the expected usage of the API.
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Good point. If it's 0 you can null it and it works; but if it's nonzero you can't null it. I decided to go the route of just setting the "other" value to 0 and not asking for data I won't use.
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The util methods I submitted in #973 do not handle zero-length results (e.g., no counters or instances) well, throwing an
IllegalArgumentExceptionwhen attempting to instantiateMemory. I've added checks to return sane values.Also I've added a Util method that looks up the counter index from the English name using the registry, to permit easier localization of counter strings.