smolnar82 commented on code in PR #1101:
URL: https://github.com/apache/knox/pull/1101#discussion_r2450877717


##########
gateway-spi/src/main/java/org/apache/knox/gateway/util/GroupUtils.java:
##########
@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.knox.gateway.util;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+public class GroupUtils {
+
+    public static List<String> getGroupStrings(Collection<String> groupNames, 
final int lengthLimit, final int sizeLimitBytes) {
+        if (groupNames.isEmpty()) {
+            return Collections.emptyList();
+        }
+
+        if (sizeLimitBytes > 0) {
+            return getGroupStringsBySize(groupNames, sizeLimitBytes);
+        } else {
+            return getGroupStringsByLength(groupNames, lengthLimit);
+        }
+    }
+
+    private static List<String> getGroupStringsBySize(Collection<String> 
groupNames, int sizeLimitBytes) {
+        final List<String> groupStrings = new ArrayList<>();
+        StringBuilder sb = new StringBuilder();

Review Comment:
   I updated the code as follows:
   - to ensure the safety of the input `groupNames`, a defensive copy is 
created which I use down the line when processing the input
   - new unit test to cover the multi-threaded usage of this new utility method



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