chibenwa commented on a change in pull request #911:
URL: https://github.com/apache/james-project/pull/911#discussion_r823364273
##########
File path:
server/container/lifecycle-api/src/main/java/org/apache/james/lifecycle/api/Disposable.java
##########
@@ -29,4 +38,134 @@
* Dispose the object
*/
void dispose();
+
+ abstract class LeakAware<T extends LeakAware.Resource> implements
Disposable {
+ public static class Resource implements Disposable {
+ private final AtomicBoolean isDisposed = new AtomicBoolean(false);
+ private final Disposable cleanup;
+
+ public Resource(Disposable cleanup) {
+ this.cleanup = cleanup;
+ }
+
+ public boolean isDisposed() {
+ return isDisposed.get();
+ }
+
+ @Override
+ public void dispose() {
+ isDisposed.set(true);
+ cleanup.dispose();
+ }
+ }
+
+ public static class LeakDetectorException extends RuntimeException {
+ public LeakDetectorException() {
+ super();
+ }
+ }
+
+ 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<LeakAware> REFERENCE_QUEUE = new
ReferenceQueue<>();
+ public static final ConcurrentHashMap<LeakAwareFinalizer, Boolean>
REFERENCES_IN_USE = new ConcurrentHashMap<>();
+ public static final Level LEVEL = Level.SIMPLE;
+
+ public static void track() {
+ if (leakDetectorEnabled()) {
+ Reference<?> referenceFromQueue;
+ while ((referenceFromQueue = REFERENCE_QUEUE.poll()) != null) {
+ ((LeakAwareFinalizer) referenceFromQueue).detectLeak();
+ referenceFromQueue.clear();
+ }
+ }
+ }
+
+ private static boolean leakDetectorEnabled() {
+ return LEVEL != Level.NONE;
+ }
+
+ private final T resource;
+ private final LeakAwareFinalizer finalizer;
+
+ protected LeakAware(T resource) {
+ this.resource = resource;
+ this.finalizer = new LeakAwareFinalizer(this, resource,
REFERENCE_QUEUE);
+ REFERENCES_IN_USE.put(finalizer, true);
+ }
+
+ @Override
+ public void dispose() {
+ REFERENCES_IN_USE.remove(finalizer);
+ resource.dispose();
+ }
+
+ public T getResource() {
+ return resource;
+ }
+ }
+
+ class LeakAwareFinalizer extends PhantomReference<LeakAware> {
+ private static final Logger LOGGER =
LoggerFactory.getLogger(LeakAwareFinalizer.class);
+
+ private final LeakAware.Resource resource;
+
+ public LeakAwareFinalizer(LeakAware referent, LeakAware.Resource
resource, ReferenceQueue<? super LeakAware> q) {
+ super(referent, q);
+ this.resource = resource;
Review comment:
No that's itended, leaks on MailImpl is notan issue, we don't need
detection for it as it do not hold resources in itself.
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