use weak references for events

Author: musketyr

libs/micronaut-worker/src/main/java/com/agorapulse/worker/event/JobExecutionResultEvent.java

@@ -19,6 +19,8 @@
 
 import io.micronaut.core.annotation.Introspected;
 
+import java.lang.ref.WeakReference;
+
 /**
  * Event dispatched after successful job execution.
  */
@@ -27,16 +29,16 @@ public class JobExecutionResultEvent {
 
     private final String name;
     private final String id;
-    private final Object result;
+    private final WeakReference<Object> result;
 
     public JobExecutionResultEvent(String name, String id, Object result) {
         this.name = name;
         this.id = id;
-        this.result = result;
+        this.result = new WeakReference<>(result);
     }
 
     public Object getResult() {
-        return result;
+        return result.get();
     }
 
     public String getId() {
@@ -49,6 +51,6 @@ public String getName() {
 
     @Override
     public String toString() {
-        return "JobExecutionResultEvent{name='%s', id='%s', result=%s}".formatted(name, id, result);
+        return "JobExecutionResultEvent{name='%s', id='%s', result=%s}".formatted(name, id, result.get());
     }
 }

libs/micronaut-worker/src/main/java/com/agorapulse/worker/queue/DefaultQueueMessage.java

@@ -17,6 +17,8 @@
  */
 package com.agorapulse.worker.queue;
 
+import java.lang.ref.WeakReference;
+
 class DefaultQueueMessage<T> implements QueueMessage<T> {
 
     static <T> DefaultQueueMessage<T> alwaysRequeue(String id, T message, Runnable doDelete, Runnable doRequeue) {
@@ -28,15 +30,15 @@ static <T> DefaultQueueMessage<T> requeueIfDeleted(String id, T message, Runnabl
     }
 
     private final String id;
-    private final T message;
+    private final WeakReference<T> message;
     private final Runnable doDelete;
     private final Runnable doRequeue;
     private final boolean alwaysRequeue;
     private boolean deleted;
 
     private DefaultQueueMessage(String id, T message, Runnable doDelete, Runnable doRequeue, boolean alwaysRequeue) {
         this.id = id;
-        this.message = message;
+        this.message = new WeakReference<>(message);
         this.doDelete = doDelete;
         this.doRequeue = doRequeue;
         this.alwaysRequeue = alwaysRequeue;
@@ -49,7 +51,7 @@ public String getId() {
 
     @Override
     public T getMessage() {
-        return message;
+        return message.get();
     }
 
     @Override