fix: add caffeine cache to prevent double fire

Author: surajkumar

application/src/main/java/org/togetherjava/tjbot/features/voicechat/DynamicVoiceChat.java

@@ -1,5 +1,7 @@
 package org.togetherjava.tjbot.features.voicechat;
 
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.entities.Guild;
 import net.dv8tion.jda.api.entities.Member;
@@ -20,6 +22,7 @@
 import org.togetherjava.tjbot.features.VoiceReceiverAdapter;
 
 import java.util.Optional;
+import java.util.concurrent.TimeUnit;
 
 /**
  * Handles dynamic voice channel creation and deletion based on user activity.
@@ -34,6 +37,9 @@ public final class DynamicVoiceChat extends VoiceReceiverAdapter {
     private final VoiceChatCleanupStrategy voiceChatCleanupStrategy;
     private final DynamicVoiceChatConfig dynamicVoiceChannelConfig;
 
+    private final Cache<Long, Boolean> deletedChannels =
+            Caffeine.newBuilder().expireAfterWrite(5, TimeUnit.MINUTES).build();
+
     /**
      * Creates a new instance of {@code DynamicVoiceChat}
      *
@@ -78,6 +84,12 @@ private void handleVoiceChannelJoin(GuildVoiceUpdateEvent event,
     }
 
     private void handleVoiceChannelLeave(AudioChannelUnion channelLeft) {
+        long channelId = channelLeft.getIdLong();
+
+        if (Boolean.TRUE.equals(deletedChannels.getIfPresent(channelId))) {
+            return;
+        }
+
         if (!eventHappenOnDynamicRootChannel(channelLeft)) {
             logger.debug("Event happened on left channel {}", channelLeft);
 
@@ -92,6 +104,7 @@ private void handleVoiceChannelLeave(AudioChannelUnion channelLeft) {
                     archiveDynamicVoiceChannel(channelLeft);
                 } else {
                     channelLeft.delete().queue();
+                    deletedChannels.put(channelId, true);
                 }
             });
         }