jrmccluskey commented on code in PR #35752:
URL: https://github.com/apache/beam/pull/35752#discussion_r2246236462
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sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/CachingFactory.java:
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@@ -45,10 +45,16 @@ public CachingFactory(@UnknownInitialization
Factory<CreatedT> innerFactory) {
}
private ConcurrentHashMap<TypeDescriptor<?>, CreatedT> getCache() {
- if (cache == null) {
- cache = new ConcurrentHashMap<>();
+ ConcurrentHashMap<TypeDescriptor<?>, CreatedT> value = cache;
+ if (value == null) {
Review Comment:
The ideal double-check lock pattern seems to utilize a local temporary
variable for performance reasons in Java. An internal outline of the pattern
laid it out that way, and the Gemini code review re-iterated that usage
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