caigy commented on code in PR #5508:
URL: https://github.com/apache/rocketmq/pull/5508#discussion_r1019779412


##########
common/src/main/java/org/apache/rocketmq/common/attribute/AttributeParser.java:
##########
@@ -16,38 +16,44 @@
  */
 package org.apache.rocketmq.common.attribute;
 
-import com.google.common.base.Joiner;
 import com.google.common.base.Strings;
-
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 public class AttributeParser {
+
+    public static final String COMMA = ",";
+
+    public static final String EQUAL_SIGN = "=";
+
+    public static final String PLUS_SIGN = "+";
+
+    private static final String MINUS_SIGN = "-";

Review Comment:
   Pls use more descriptive names, like 'ATTR_ARRAY_SEPARATOR'. 



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