nandorKollar commented on code in PR #4064:
URL: https://github.com/apache/polaris/pull/4064#discussion_r3071745145


##########
runtime/service/src/main/java/org/apache/polaris/service/events/PolarisEventType.java:
##########
@@ -19,189 +19,223 @@
 
 package org.apache.polaris.service.events;
 
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Collectors;
+
 public enum PolarisEventType {
   // Catalog Events
-  BEFORE_CREATE_CATALOG(100),
-  AFTER_CREATE_CATALOG(101),
-  BEFORE_DELETE_CATALOG(102),
-  AFTER_DELETE_CATALOG(103),
-  BEFORE_GET_CATALOG(104),
-  AFTER_GET_CATALOG(105),
-  BEFORE_UPDATE_CATALOG(106),
-  AFTER_UPDATE_CATALOG(107),
-  BEFORE_LIST_CATALOGS(108),
-  AFTER_LIST_CATALOGS(109),
+  BEFORE_CREATE_CATALOG(100, Category.CATALOG),
+  AFTER_CREATE_CATALOG(101, Category.CATALOG),
+  BEFORE_DELETE_CATALOG(102, Category.CATALOG),
+  AFTER_DELETE_CATALOG(103, Category.CATALOG),
+  BEFORE_GET_CATALOG(104, Category.CATALOG),
+  AFTER_GET_CATALOG(105, Category.CATALOG),
+  BEFORE_UPDATE_CATALOG(106, Category.CATALOG),
+  AFTER_UPDATE_CATALOG(107, Category.CATALOG),
+  BEFORE_LIST_CATALOGS(108, Category.CATALOG),
+  AFTER_LIST_CATALOGS(109, Category.CATALOG),
 
   // Catalog Role Events
-  BEFORE_CREATE_CATALOG_ROLE(200),
-  AFTER_CREATE_CATALOG_ROLE(201),
-  BEFORE_DELETE_CATALOG_ROLE(202),
-  AFTER_DELETE_CATALOG_ROLE(203),
-  BEFORE_GET_CATALOG_ROLE(204),
-  AFTER_GET_CATALOG_ROLE(205),
-  BEFORE_UPDATE_CATALOG_ROLE(206),
-  AFTER_UPDATE_CATALOG_ROLE(207),
-  BEFORE_LIST_CATALOG_ROLES(208),
-  AFTER_LIST_CATALOG_ROLES(209),
-  BEFORE_ADD_GRANT_TO_CATALOG_ROLE(210),
-  AFTER_ADD_GRANT_TO_CATALOG_ROLE(211),
-  BEFORE_REVOKE_GRANT_FROM_CATALOG_ROLE(212),
-  AFTER_REVOKE_GRANT_FROM_CATALOG_ROLE(213),
-  BEFORE_LIST_ASSIGNEE_PRINCIPAL_ROLES_FOR_CATALOG_ROLE(214),
-  AFTER_LIST_ASSIGNEE_PRINCIPAL_ROLES_FOR_CATALOG_ROLE(215),
-  BEFORE_LIST_GRANTS_FOR_CATALOG_ROLE(216),
-  AFTER_LIST_GRANTS_FOR_CATALOG_ROLE(217),
+  BEFORE_CREATE_CATALOG_ROLE(200, Category.CATALOG_ROLE),
+  AFTER_CREATE_CATALOG_ROLE(201, Category.CATALOG_ROLE),
+  BEFORE_DELETE_CATALOG_ROLE(202, Category.CATALOG_ROLE),
+  AFTER_DELETE_CATALOG_ROLE(203, Category.CATALOG_ROLE),
+  BEFORE_GET_CATALOG_ROLE(204, Category.CATALOG_ROLE),
+  AFTER_GET_CATALOG_ROLE(205, Category.CATALOG_ROLE),
+  BEFORE_UPDATE_CATALOG_ROLE(206, Category.CATALOG_ROLE),
+  AFTER_UPDATE_CATALOG_ROLE(207, Category.CATALOG_ROLE),
+  BEFORE_LIST_CATALOG_ROLES(208, Category.CATALOG_ROLE),
+  AFTER_LIST_CATALOG_ROLES(209, Category.CATALOG_ROLE),
+  BEFORE_ADD_GRANT_TO_CATALOG_ROLE(210, Category.CATALOG_ROLE),
+  AFTER_ADD_GRANT_TO_CATALOG_ROLE(211, Category.CATALOG_ROLE),
+  BEFORE_REVOKE_GRANT_FROM_CATALOG_ROLE(212, Category.CATALOG_ROLE),
+  AFTER_REVOKE_GRANT_FROM_CATALOG_ROLE(213, Category.CATALOG_ROLE),
+  BEFORE_LIST_ASSIGNEE_PRINCIPAL_ROLES_FOR_CATALOG_ROLE(214, 
Category.CATALOG_ROLE),
+  AFTER_LIST_ASSIGNEE_PRINCIPAL_ROLES_FOR_CATALOG_ROLE(215, 
Category.CATALOG_ROLE),
+  BEFORE_LIST_GRANTS_FOR_CATALOG_ROLE(216, Category.CATALOG_ROLE),
+  AFTER_LIST_GRANTS_FOR_CATALOG_ROLE(217, Category.CATALOG_ROLE),
 
   // Principal Events
-  BEFORE_CREATE_PRINCIPAL(300),
-  AFTER_CREATE_PRINCIPAL(301),
-  BEFORE_DELETE_PRINCIPAL(302),
-  AFTER_DELETE_PRINCIPAL(303),
-  BEFORE_GET_PRINCIPAL(304),
-  AFTER_GET_PRINCIPAL(305),
-  BEFORE_UPDATE_PRINCIPAL(306),
-  AFTER_UPDATE_PRINCIPAL(307),
-  BEFORE_ROTATE_CREDENTIALS(308),
-  AFTER_ROTATE_CREDENTIALS(309),
-  BEFORE_RESET_CREDENTIALS(310),
-  AFTER_RESET_CREDENTIALS(311),
-  BEFORE_LIST_PRINCIPALS(312),
-  AFTER_LIST_PRINCIPALS(313),
-  BEFORE_ASSIGN_PRINCIPAL_ROLE(314),
-  AFTER_ASSIGN_PRINCIPAL_ROLE(315),
-  BEFORE_REVOKE_PRINCIPAL_ROLE(316),
-  AFTER_REVOKE_PRINCIPAL_ROLE(317),
-  BEFORE_LIST_ASSIGNED_PRINCIPAL_ROLES(318),
-  AFTER_LIST_ASSIGNED_PRINCIPAL_ROLES(319),
+  BEFORE_CREATE_PRINCIPAL(300, Category.PRINCIPAL),
+  AFTER_CREATE_PRINCIPAL(301, Category.PRINCIPAL),
+  BEFORE_DELETE_PRINCIPAL(302, Category.PRINCIPAL),
+  AFTER_DELETE_PRINCIPAL(303, Category.PRINCIPAL),
+  BEFORE_GET_PRINCIPAL(304, Category.PRINCIPAL),
+  AFTER_GET_PRINCIPAL(305, Category.PRINCIPAL),
+  BEFORE_UPDATE_PRINCIPAL(306, Category.PRINCIPAL),
+  AFTER_UPDATE_PRINCIPAL(307, Category.PRINCIPAL),
+  BEFORE_ROTATE_CREDENTIALS(308, Category.PRINCIPAL),
+  AFTER_ROTATE_CREDENTIALS(309, Category.PRINCIPAL),
+  BEFORE_RESET_CREDENTIALS(310, Category.PRINCIPAL),
+  AFTER_RESET_CREDENTIALS(311, Category.PRINCIPAL),
+  BEFORE_LIST_PRINCIPALS(312, Category.PRINCIPAL),
+  AFTER_LIST_PRINCIPALS(313, Category.PRINCIPAL),
+  BEFORE_ASSIGN_PRINCIPAL_ROLE(314, Category.PRINCIPAL),
+  AFTER_ASSIGN_PRINCIPAL_ROLE(315, Category.PRINCIPAL),
+  BEFORE_REVOKE_PRINCIPAL_ROLE(316, Category.PRINCIPAL),
+  AFTER_REVOKE_PRINCIPAL_ROLE(317, Category.PRINCIPAL),
+  BEFORE_LIST_ASSIGNED_PRINCIPAL_ROLES(318, Category.PRINCIPAL),
+  AFTER_LIST_ASSIGNED_PRINCIPAL_ROLES(319, Category.PRINCIPAL),
 
   // Principal Role Events
-  BEFORE_CREATE_PRINCIPAL_ROLE(400),
-  AFTER_CREATE_PRINCIPAL_ROLE(401),
-  BEFORE_DELETE_PRINCIPAL_ROLE(402),
-  AFTER_DELETE_PRINCIPAL_ROLE(403),
-  BEFORE_GET_PRINCIPAL_ROLE(404),
-  AFTER_GET_PRINCIPAL_ROLE(405),
-  BEFORE_UPDATE_PRINCIPAL_ROLE(406),
-  AFTER_UPDATE_PRINCIPAL_ROLE(407),
-  BEFORE_LIST_PRINCIPAL_ROLES(408),
-  AFTER_LIST_PRINCIPAL_ROLES(409),
-  BEFORE_ASSIGN_CATALOG_ROLE_TO_PRINCIPAL_ROLE(410),
-  AFTER_ASSIGN_CATALOG_ROLE_TO_PRINCIPAL_ROLE(411),
-  BEFORE_REVOKE_CATALOG_ROLE_FROM_PRINCIPAL_ROLE(412),
-  AFTER_REVOKE_CATALOG_ROLE_FROM_PRINCIPAL_ROLE(413),
-  BEFORE_LIST_ASSIGNEE_PRINCIPALS_FOR_PRINCIPAL_ROLE(414),
-  AFTER_LIST_ASSIGNEE_PRINCIPALS_FOR_PRINCIPAL_ROLE(415),
-  BEFORE_LIST_CATALOG_ROLES_FOR_PRINCIPAL_ROLE(416),
-  AFTER_LIST_CATALOG_ROLES_FOR_PRINCIPAL_ROLE(417),
+  BEFORE_CREATE_PRINCIPAL_ROLE(400, Category.PRINCIPAL_ROLE),
+  AFTER_CREATE_PRINCIPAL_ROLE(401, Category.PRINCIPAL_ROLE),
+  BEFORE_DELETE_PRINCIPAL_ROLE(402, Category.PRINCIPAL_ROLE),
+  AFTER_DELETE_PRINCIPAL_ROLE(403, Category.PRINCIPAL_ROLE),
+  BEFORE_GET_PRINCIPAL_ROLE(404, Category.PRINCIPAL_ROLE),
+  AFTER_GET_PRINCIPAL_ROLE(405, Category.PRINCIPAL_ROLE),
+  BEFORE_UPDATE_PRINCIPAL_ROLE(406, Category.PRINCIPAL_ROLE),
+  AFTER_UPDATE_PRINCIPAL_ROLE(407, Category.PRINCIPAL_ROLE),
+  BEFORE_LIST_PRINCIPAL_ROLES(408, Category.PRINCIPAL_ROLE),
+  AFTER_LIST_PRINCIPAL_ROLES(409, Category.PRINCIPAL_ROLE),
+  BEFORE_ASSIGN_CATALOG_ROLE_TO_PRINCIPAL_ROLE(410, Category.PRINCIPAL_ROLE),
+  AFTER_ASSIGN_CATALOG_ROLE_TO_PRINCIPAL_ROLE(411, Category.PRINCIPAL_ROLE),
+  BEFORE_REVOKE_CATALOG_ROLE_FROM_PRINCIPAL_ROLE(412, Category.PRINCIPAL_ROLE),
+  AFTER_REVOKE_CATALOG_ROLE_FROM_PRINCIPAL_ROLE(413, Category.PRINCIPAL_ROLE),
+  BEFORE_LIST_ASSIGNEE_PRINCIPALS_FOR_PRINCIPAL_ROLE(414, 
Category.PRINCIPAL_ROLE),
+  AFTER_LIST_ASSIGNEE_PRINCIPALS_FOR_PRINCIPAL_ROLE(415, 
Category.PRINCIPAL_ROLE),
+  BEFORE_LIST_CATALOG_ROLES_FOR_PRINCIPAL_ROLE(416, Category.PRINCIPAL_ROLE),
+  AFTER_LIST_CATALOG_ROLES_FOR_PRINCIPAL_ROLE(417, Category.PRINCIPAL_ROLE),
 
   // Namespace Events
-  BEFORE_CREATE_NAMESPACE(500),
-  AFTER_CREATE_NAMESPACE(501),
-  BEFORE_LIST_NAMESPACES(502),
-  AFTER_LIST_NAMESPACES(503),
-  BEFORE_LOAD_NAMESPACE_METADATA(504),
-  AFTER_LOAD_NAMESPACE_METADATA(505),
-  BEFORE_CHECK_EXISTS_NAMESPACE(506),
-  AFTER_CHECK_EXISTS_NAMESPACE(507),
-  BEFORE_DROP_NAMESPACE(508),
-  AFTER_DROP_NAMESPACE(509),
-  BEFORE_UPDATE_NAMESPACE_PROPERTIES(510),
-  AFTER_UPDATE_NAMESPACE_PROPERTIES(511),
+  BEFORE_CREATE_NAMESPACE(500, Category.NAMESPACE),
+  AFTER_CREATE_NAMESPACE(501, Category.NAMESPACE),
+  BEFORE_LIST_NAMESPACES(502, Category.NAMESPACE),
+  AFTER_LIST_NAMESPACES(503, Category.NAMESPACE),
+  BEFORE_LOAD_NAMESPACE_METADATA(504, Category.NAMESPACE),
+  AFTER_LOAD_NAMESPACE_METADATA(505, Category.NAMESPACE),
+  BEFORE_CHECK_EXISTS_NAMESPACE(506, Category.NAMESPACE),
+  AFTER_CHECK_EXISTS_NAMESPACE(507, Category.NAMESPACE),
+  BEFORE_DROP_NAMESPACE(508, Category.NAMESPACE),
+  AFTER_DROP_NAMESPACE(509, Category.NAMESPACE),
+  BEFORE_UPDATE_NAMESPACE_PROPERTIES(510, Category.NAMESPACE),
+  AFTER_UPDATE_NAMESPACE_PROPERTIES(511, Category.NAMESPACE),
 
   // Table Events
-  BEFORE_CREATE_TABLE(600),
-  AFTER_CREATE_TABLE(601),
-  BEFORE_LIST_TABLES(602),
-  AFTER_LIST_TABLES(603),
-  BEFORE_LOAD_TABLE(604),
-  AFTER_LOAD_TABLE(605),
-  BEFORE_CHECK_EXISTS_TABLE(606),
-  AFTER_CHECK_EXISTS_TABLE(607),
-  BEFORE_DROP_TABLE(608),
-  AFTER_DROP_TABLE(609),
-  BEFORE_REGISTER_TABLE(610),
-  AFTER_REGISTER_TABLE(611),
-  BEFORE_RENAME_TABLE(612),
-  AFTER_RENAME_TABLE(613),
-  BEFORE_UPDATE_TABLE(614),
-  AFTER_UPDATE_TABLE(615),
-  BEFORE_REFRESH_TABLE(616),
-  AFTER_REFRESH_TABLE(617),
+  BEFORE_CREATE_TABLE(600, Category.TABLE),
+  AFTER_CREATE_TABLE(601, Category.TABLE),
+  BEFORE_LIST_TABLES(602, Category.TABLE),
+  AFTER_LIST_TABLES(603, Category.TABLE),
+  BEFORE_LOAD_TABLE(604, Category.TABLE),
+  AFTER_LOAD_TABLE(605, Category.TABLE),
+  BEFORE_CHECK_EXISTS_TABLE(606, Category.TABLE),
+  AFTER_CHECK_EXISTS_TABLE(607, Category.TABLE),
+  BEFORE_DROP_TABLE(608, Category.TABLE),
+  AFTER_DROP_TABLE(609, Category.TABLE),
+  BEFORE_REGISTER_TABLE(610, Category.TABLE),
+  AFTER_REGISTER_TABLE(611, Category.TABLE),
+  BEFORE_RENAME_TABLE(612, Category.TABLE),
+  AFTER_RENAME_TABLE(613, Category.TABLE),
+  BEFORE_UPDATE_TABLE(614, Category.TABLE),
+  AFTER_UPDATE_TABLE(615, Category.TABLE),
+  BEFORE_REFRESH_TABLE(616, Category.TABLE),
+  AFTER_REFRESH_TABLE(617, Category.TABLE),
 
   // View Events
-  BEFORE_CREATE_VIEW(700),
-  AFTER_CREATE_VIEW(701),
-  BEFORE_LIST_VIEWS(702),
-  AFTER_LIST_VIEWS(703),
-  BEFORE_LOAD_VIEW(704),
-  AFTER_LOAD_VIEW(705),
-  BEFORE_CHECK_EXISTS_VIEW(706),
-  AFTER_CHECK_EXISTS_VIEW(707),
-  BEFORE_DROP_VIEW(708),
-  AFTER_DROP_VIEW(709),
-  BEFORE_RENAME_VIEW(710),
-  AFTER_RENAME_VIEW(711),
-  BEFORE_REPLACE_VIEW(712),
-  AFTER_REPLACE_VIEW(713),
-  BEFORE_REFRESH_VIEW(714),
-  AFTER_REFRESH_VIEW(715),
+  BEFORE_CREATE_VIEW(700, Category.VIEW),
+  AFTER_CREATE_VIEW(701, Category.VIEW),
+  BEFORE_LIST_VIEWS(702, Category.VIEW),
+  AFTER_LIST_VIEWS(703, Category.VIEW),
+  BEFORE_LOAD_VIEW(704, Category.VIEW),
+  AFTER_LOAD_VIEW(705, Category.VIEW),
+  BEFORE_CHECK_EXISTS_VIEW(706, Category.VIEW),
+  AFTER_CHECK_EXISTS_VIEW(707, Category.VIEW),
+  BEFORE_DROP_VIEW(708, Category.VIEW),
+  AFTER_DROP_VIEW(709, Category.VIEW),
+  BEFORE_RENAME_VIEW(710, Category.VIEW),
+  AFTER_RENAME_VIEW(711, Category.VIEW),
+  BEFORE_REPLACE_VIEW(712, Category.VIEW),
+  AFTER_REPLACE_VIEW(713, Category.VIEW),
+  BEFORE_REFRESH_VIEW(714, Category.VIEW),
+  AFTER_REFRESH_VIEW(715, Category.VIEW),
 
   // Credential Events
-  BEFORE_LOAD_CREDENTIALS(800),
-  AFTER_LOAD_CREDENTIALS(801),
+  BEFORE_LOAD_CREDENTIALS(800, Category.CREDENTIAL),
+  AFTER_LOAD_CREDENTIALS(801, Category.CREDENTIAL),
   // Transaction Events
-  BEFORE_COMMIT_TRANSACTION(900),
-  AFTER_COMMIT_TRANSACTION(901),
+  BEFORE_COMMIT_TRANSACTION(900, Category.TRANSACTION),
+  AFTER_COMMIT_TRANSACTION(901, Category.TRANSACTION),
   // Notification Events
-  BEFORE_SEND_NOTIFICATION(1000),
-  AFTER_SEND_NOTIFICATION(1001),
+  BEFORE_SEND_NOTIFICATION(1000, Category.NOTIFICATION),
+  AFTER_SEND_NOTIFICATION(1001, Category.NOTIFICATION),
 
   // Configuration Events
-  BEFORE_GET_CONFIG(1100),
-  AFTER_GET_CONFIG(1101),
+  BEFORE_GET_CONFIG(1100, Category.CONFIG),
+  AFTER_GET_CONFIG(1101, Category.CONFIG),
 
   // Policy Events
-  BEFORE_CREATE_POLICY(1200),
-  AFTER_CREATE_POLICY(1201),
-  BEFORE_LIST_POLICIES(1202),
-  AFTER_LIST_POLICIES(1203),
-  BEFORE_LOAD_POLICY(1204),
-  AFTER_LOAD_POLICY(1205),
-  BEFORE_UPDATE_POLICY(1206),
-  AFTER_UPDATE_POLICY(1207),
-  BEFORE_DROP_POLICY(1208),
-  AFTER_DROP_POLICY(1209),
-  BEFORE_ATTACH_POLICY(1210),
-  AFTER_ATTACH_POLICY(1211),
-  BEFORE_DETACH_POLICY(1212),
-  AFTER_DETACH_POLICY(1213),
-  BEFORE_GET_APPLICABLE_POLICIES(1214),
-  AFTER_GET_APPLICABLE_POLICIES(1215),
+  BEFORE_CREATE_POLICY(1200, Category.POLICY),
+  AFTER_CREATE_POLICY(1201, Category.POLICY),
+  BEFORE_LIST_POLICIES(1202, Category.POLICY),
+  AFTER_LIST_POLICIES(1203, Category.POLICY),
+  BEFORE_LOAD_POLICY(1204, Category.POLICY),
+  AFTER_LOAD_POLICY(1205, Category.POLICY),
+  BEFORE_UPDATE_POLICY(1206, Category.POLICY),
+  AFTER_UPDATE_POLICY(1207, Category.POLICY),
+  BEFORE_DROP_POLICY(1208, Category.POLICY),
+  AFTER_DROP_POLICY(1209, Category.POLICY),
+  BEFORE_ATTACH_POLICY(1210, Category.POLICY),
+  AFTER_ATTACH_POLICY(1211, Category.POLICY),
+  BEFORE_DETACH_POLICY(1212, Category.POLICY),
+  AFTER_DETACH_POLICY(1213, Category.POLICY),
+  BEFORE_GET_APPLICABLE_POLICIES(1214, Category.POLICY),
+  AFTER_GET_APPLICABLE_POLICIES(1215, Category.POLICY),
 
   // Generic Table Events
-  BEFORE_CREATE_GENERIC_TABLE(1300),
-  AFTER_CREATE_GENERIC_TABLE(1301),
-  BEFORE_DROP_GENERIC_TABLE(1302),
-  AFTER_DROP_GENERIC_TABLE(1303),
-  BEFORE_LIST_GENERIC_TABLES(1304),
-  AFTER_LIST_GENERIC_TABLES(1305),
-  BEFORE_LOAD_GENERIC_TABLE(1306),
-  AFTER_LOAD_GENERIC_TABLE(1307),
+  BEFORE_CREATE_GENERIC_TABLE(1300, Category.GENERIC_TABLE),
+  AFTER_CREATE_GENERIC_TABLE(1301, Category.GENERIC_TABLE),
+  BEFORE_DROP_GENERIC_TABLE(1302, Category.GENERIC_TABLE),
+  AFTER_DROP_GENERIC_TABLE(1303, Category.GENERIC_TABLE),
+  BEFORE_LIST_GENERIC_TABLES(1304, Category.GENERIC_TABLE),
+  AFTER_LIST_GENERIC_TABLES(1305, Category.GENERIC_TABLE),
+  BEFORE_LOAD_GENERIC_TABLE(1306, Category.GENERIC_TABLE),
+  AFTER_LOAD_GENERIC_TABLE(1307, Category.GENERIC_TABLE),
 
   // Task Execution Events
-  BEFORE_ATTEMPT_TASK(1400),
-  AFTER_ATTEMPT_TASK(1401),
+  BEFORE_ATTEMPT_TASK(1400, Category.TASK_EXECUTION),
+  AFTER_ATTEMPT_TASK(1401, Category.TASK_EXECUTION),
 
   // Rate Limiting Events
-  BEFORE_LIMIT_REQUEST_RATE(1500);
+  BEFORE_LIMIT_REQUEST_RATE(1500, Category.RATE_LIMITING);
 
   private final int code;
+  private final Category category;
 
-  private PolarisEventType(int code) {
+  PolarisEventType(int code, Category category) {
     this.code = code;
+    this.category = category;
   }
 
   public int code() {
     return code;
   }
+
+  public Category category() {
+    return category;
+  }
+
+  public static Set<PolarisEventType> typesOfCategory(Category category) {

Review Comment:
   We can introduce a map to improve lookup speed, if that would help, 
something like this:
   ```
     private static final Map<Category, EnumSet<PolarisEventType>> 
categoryToTypes = new HashMap<>();
   
     static {
       for (PolarisEventType type : values()) {
         EnumSet<PolarisEventType> types = 
categoryToTypes.getOrDefault(type.category, 
EnumSet.noneOf(PolarisEventType.class));
         types.add(type);
         categoryToTypes.put(type.category, types);
       }
     }
   ```
   
   and rewrite `typeOfCategory`:
   ```
     public static Set<PolarisEventType> typesOfCategory(Category category) {
       return categoryToTypes.get(category);
     }
   ```
   
   Did you think of something like this?



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