chibenwa commented on a change in pull request #911:
URL: https://github.com/apache/james-project/pull/911#discussion_r823363895



##########
File path: 
server/container/lifecycle-api/src/main/java/org/apache/james/lifecycle/api/Disposable.java
##########
@@ -29,4 +39,111 @@
      * Dispose the object
      */
     void dispose();
+
+    abstract class LeakAware implements Disposable {
+        public static class LeakDetectorException extends RuntimeException {
+            public LeakDetectorException() {
+                super();
+            }
+
+            public LeakDetectorException(String message) {
+                super(message);
+            }
+
+            public LeakDetectorException(String message, Throwable cause) {
+                super(message, cause);
+            }
+        }
+
+        public enum Level {
+            NONE,
+            SIMPLE,
+            ADVANCED,
+            TESTING;
+
+            static Level parse(String input) {
+                for (Level level : values()) {
+                    if (level.name().equalsIgnoreCase(input)) {
+                        return level;
+                    }
+                }
+                throw new IllegalArgumentException(String.format("Unknown 
level `%s`", input));
+            }
+        }
+
+        public static final ReferenceQueue<Object> REFERENCE_QUEUE = new 
ReferenceQueue<>();
+        public static final List<LeakAwareFinalizer> LEAK_REFERENCES = new 
ArrayList<>();

Review comment:
       > We can use Collections.synchronizedSet to replace it.
   
   Please no synchronize. ConcurrentHashMap for the win!




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