Fixed - RedissonTopic.removeListener throws RejectedExecutionException

redisson/src/main/java/org/redisson/pubsub/PublishSubscribeService.java

@@ -304,6 +304,10 @@ public class PublishSubscribeService {
     }
     
     public RFuture<Void> unsubscribe(final ChannelName channelName, final AsyncSemaphore lock) {
+        if (connectionManager.isShuttingDown()) {
+            return RedissonPromise.newSucceededFuture(null);
+        }
+        
         final PubSubConnectionEntry entry = name2PubSubConnection.remove(channelName);
         if (entry == null) {
             lock.release();
@@ -333,6 +337,10 @@ public class PublishSubscribeService {
     }
     
     public RFuture<Codec> unsubscribe(final ChannelName channelName, final PubSubType topicType) {
+        if (connectionManager.isShuttingDown()) {
+            return RedissonPromise.newSucceededFuture(null);
+        }
+
         final RPromise<Codec> result = new RedissonPromise<Codec>();
         final AsyncSemaphore lock = getSemaphore(channelName);
         lock.acquire(new Runnable() {