cushon commented on code in PR #23210:
URL: https://github.com/apache/beam/pull/23210#discussion_r1090974426
##########
sdks/java/core/src/main/java/org/apache/beam/sdk/coders/RowCoderGenerator.java:
##########
@@ -184,6 +186,30 @@ public static Coder<Row> generate(Schema schema) {
return rowCoder;
}
+ private static ClassLoadingStrategy<ClassLoader>
getClassLoadingStrategy(Class<?> targetClass) {
+ try {
+ ClassLoadingStrategy<ClassLoader> strategy;
+ if (ClassInjector.UsingLookup.isAvailable()) {
+ Class<?> methodHandles =
Class.forName("java.lang.invoke.MethodHandles");
+ Object lookup = methodHandles.getMethod("lookup").invoke(null);
+ Method privateLookupIn =
+ methodHandles.getMethod(
+ "privateLookupIn",
+ Class.class,
+ Class.forName("java.lang.invoke.MethodHandles$Lookup"));
+ Object privateLookup = privateLookupIn.invoke(null, targetClass,
lookup);
+ strategy = ClassLoadingStrategy.UsingLookup.of(privateLookup);
+ } else if (ClassInjector.UsingReflection.isAvailable()) {
+ strategy = ClassLoadingStrategy.Default.INJECTION;
+ } else {
+ throw new IllegalStateException("No code generation strategy
available");
+ }
+ return strategy;
+ } catch (ReflectiveOperationException e) {
+ throw new LinkageError(e.getMessage(), e);
+ }
+ }
+
Review Comment:
That sounds good. I'm happy to consolidate it wherever you prefer, can you
recommend a location? I wasn't sure what the best place for that shared utility
would be.
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