Make lazy initialization of static Val.Obj thread-safe #136
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iuliand-db
reviewed
Nov 4, 2021
| @@ -155,10 +155,11 @@ object Val{ | |||
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| private[this] def getValue0: util.LinkedHashMap[String, Obj.Member] = { | |||
| if(value0 == null) { | |||
| value0 = new java.util.LinkedHashMap[String, Val.Obj.Member] | |||
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Could you add a comment explaining why we do things in this way, and the multi-threaded guarantee we want to maintain?
apattidb
approved these changes
Nov 15, 2021
Static Val.Obj instances are created by the optimizer and will end up in the parse cache. If the cache is shared by multiple threads, initialization must be sufficiently safe, i.e. computing a value multiple times in race conditions is allowed (and cheaper than ensuring that it doesn't happen), but object must never get into an invalid intermediate state.
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Static Val.Obj instances are created by the optimizer and will end up in the parse cache. If the cache is shared by multiple threads, initialization must be sufficiently safe, i.e. computing a value multiple times in race conditions is allowed (and cheaper than ensuring that it doesn't happen), but object must never get into an invalid intermediate state.
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Static Val.Obj instances are created by the optimizer and will end up in the parse cache. If the cache is shared by multiple threads, initialization must be sufficiently safe, i.e. computing a value multiple times in race conditions is allowed (and cheaper than ensuring that it doesn't happen), but object must never get into an invalid intermediate state.