[GitHub] [beam] kileys commented on a diff in pull request #23210: Replace more uses of `ClassLoadingStrategy.Default.INJECTION`

[GitBox <gi...@apache.org>]

kileys commented on code in PR #23210:
URL: https://github.com/apache/beam/pull/23210#discussion_r1067317189


##########
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:
   Can we do this once in a core.util file? 



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