[tryout fix] concurrency bug in NamespacedHierarchicalStore#computeIfAbsent(Object, Object, Function) junit-team#5171 junit-team#5209

Signed-off-by: Vincent Potucek <vpotucek@me.com>

Author: Vincent Potucek

junit-platform-engine/src/main/java/org/junit/platform/engine/support/store/NamespacedHierarchicalStore.java

@@ -30,7 +30,6 @@
 import java.util.function.Supplier;
 
 import org.apiguardian.api.API;
-import org.jspecify.annotations.NonNull;
 import org.jspecify.annotations.Nullable;
 import org.junit.platform.commons.util.Preconditions;
 import org.junit.platform.commons.util.UnrecoverableExceptions;
@@ -248,7 +247,7 @@ public <K, V> Object computeIfAbsent(N namespace, K key, Function<? super K, ? e
 			var value = storedValues.compute(compositeKey, (__, currentValue) ->
 					currentValue != null && !currentValue.equals(storedValue)
 					? currentValue
-					: getStoredValue(key, defaultCreator));
+					: storeNewValue(key, defaultCreator));
 			try {
 				return requireNonNull(value.evaluate());
 			}
@@ -262,7 +261,7 @@ public <K, V> Object computeIfAbsent(N namespace, K key, Function<? super K, ? e
 		return result;
 	}
 
-	private <K, V> StoredValue getStoredValue(K key, Function<? super K, ? extends V> defaultCreator) {
+	private <K, V> StoredValue storeNewValue(K key, Function<? super K, ? extends V> defaultCreator) {
 		rejectIfClosed();
 		return newStoredValue(new MemoizingSupplier(() -> {
 			rejectIfClosed();