Fix ConcurrentModificationException on mass Ant project open. #7989
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Evaluators synchronize their inner workings on a per-instance basis. The static cache however is shared between instances and should use a sharable collection. ConcurrentHashMap is probably the best choice here, since the potentially long running computeIfAbsent would only lock the item, not the map.
mbien
added
Java
mbien
commented
Nov 25, 2024
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+893
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| /** | ||
| * cache shared between Evaluator instances. | ||
| */ | ||
| private static final Map<String, String> limitModulesCache = new ConcurrentHashMap<>(); | ||
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| private static String getLimitModules(String javacRelease) { | ||
| return limitModulesCache.computeIfAbsent(javacRelease, release -> { |
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on second thought: this probably could be a plain old synchronized map? The keys are javac release versions, so it won't use the per-item lock feature of the CMH very often.
matthiasblaesing
approved these changes
Nov 29, 2024
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Evaluators synchronize their inner workings on a per-instance basis. The static cache however is shared between instances and should use a sharable collection.
ConcurrentHashMapis probably the best choice here, since the potentially long runningcomputeIfAbsentwould only lock the item, not the map. (although in practice it probably doesn't have enough keys to leverage this feature)Exception during NB startup while it is trying to open ~100 NB modules