Implement ConcurrentPlayerWorldTracker to allow for async online player names and worlds lookup

src/main/java/org/mvplugins/multiverse/core/command/MVCommandCompletions.java

@@ -100,7 +100,7 @@
         registerAsyncCompletion("mvworlds", this::suggestMVWorlds);
         registerAsyncCompletion("mvworldpropsname", this::suggestMVWorldPropsName);
         registerAsyncCompletion("mvworldpropsvalue", this::suggestMVWorldPropsValue);
-        registerAsyncCompletion("playersarray", this::suggestPlayersArray);
+        registerCompletion("playersarray", this::suggestPlayersArray); // getting online players cannot be async
         registerStaticCompletion("propsmodifyaction", suggestEnums(PropertyModifyAction.class));
         registerStaticCompletion("spawncategories", suggestEnums(SpawnCategory.class));
         registerAsyncCompletion("spawncategorypropsname", this::suggestSpawnCategoryPropsName);

src/main/java/org/mvplugins/multiverse/core/destination/core/BedDestination.java

@@ -6,7 +6,7 @@
 
 import co.aikar.locales.MessageKey;
 import co.aikar.locales.MessageKeyProvider;
-import org.bukkit.Bukkit;
+import jakarta.inject.Inject;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
@@ -20,8 +20,7 @@
 import org.mvplugins.multiverse.core.utils.PlayerFinder;
 import org.mvplugins.multiverse.core.utils.result.Attempt;
 import org.mvplugins.multiverse.core.utils.result.FailureReason;
-
-import static org.mvplugins.multiverse.core.locale.message.MessageReplacement.replace;
+import org.mvplugins.multiverse.core.world.helpers.ConcurrentPlayerWorldTracker;
 
 /**
  * {@link Destination} implementation for beds.
@@ -30,7 +29,11 @@
 public final class BedDestination implements Destination<BedDestination, BedDestinationInstance, BedDestination.InstanceFailureReason> {
     static final String OWN_BED_STRING = "playerbed";
 
-    BedDestination() {
+    private final ConcurrentPlayerWorldTracker worldTracker;
+
+    @Inject
+    BedDestination(@NotNull ConcurrentPlayerWorldTracker worldTracker) {
+        this.worldTracker = worldTracker;
     }
 
     /**
@@ -62,8 +65,8 @@ public final class BedDestination implements Destination<BedDestination, BedDest
     @Override
     public @NotNull Collection<DestinationSuggestionPacket> suggestDestinations(
             @NotNull CommandSender sender, @Nullable String destinationParams) {
-        List<DestinationSuggestionPacket> collect = Bukkit.getOnlinePlayers().stream()
-                .map(player -> new DestinationSuggestionPacket(this, player.getName(), player.getName()))
+        List<DestinationSuggestionPacket> collect = worldTracker.getOnlinePlayers().stream()
+                .map(player -> new DestinationSuggestionPacket(this, player, player))
                 .collect(Collectors.toList());
         if (sender instanceof Player) {
             collect.add(new DestinationSuggestionPacket(this, OWN_BED_STRING, OWN_BED_STRING));

src/main/java/org/mvplugins/multiverse/core/destination/core/PlayerDestination.java

@@ -4,7 +4,7 @@
 
 import co.aikar.locales.MessageKey;
 import co.aikar.locales.MessageKeyProvider;
-import org.bukkit.Bukkit;
+import jakarta.inject.Inject;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
@@ -14,21 +14,26 @@
 import org.mvplugins.multiverse.core.destination.Destination;
 import org.mvplugins.multiverse.core.destination.DestinationSuggestionPacket;
 import org.mvplugins.multiverse.core.locale.MVCorei18n;
-import org.mvplugins.multiverse.core.locale.message.MessageReplacement;
 import org.mvplugins.multiverse.core.locale.message.MessageReplacement.Replace;
 import org.mvplugins.multiverse.core.utils.PlayerFinder;
 import org.mvplugins.multiverse.core.utils.result.Attempt;
 import org.mvplugins.multiverse.core.utils.result.FailureReason;
+import org.mvplugins.multiverse.core.world.helpers.ConcurrentPlayerWorldTracker;
 
 /**
  * {@link Destination} implementation for players.s
  */
 @Service
 public final class PlayerDestination implements Destination<PlayerDestination, PlayerDestinationInstance, PlayerDestination.InstanceFailureReason> {
+
+    private final ConcurrentPlayerWorldTracker playerWorldTracker;
+
     /**
      * Creates a new instance of the PlayerDestination.
      */
-    PlayerDestination() {
+    @Inject
+    PlayerDestination(@NotNull ConcurrentPlayerWorldTracker playerWorldTracker) {
+        this.playerWorldTracker = playerWorldTracker;
     }
 
     /**
@@ -60,8 +65,8 @@ public final class PlayerDestination implements Destination<PlayerDestination, P
     @Override
     public @NotNull Collection<DestinationSuggestionPacket> suggestDestinations(
             @NotNull CommandSender sender, @Nullable String destinationParams) {
-        return Bukkit.getOnlinePlayers().stream()
-                .map(p -> new DestinationSuggestionPacket(this, p.getName(), p.getName()))
+        return playerWorldTracker.getOnlinePlayers().stream()
+                .map(player -> new DestinationSuggestionPacket(this, player, player))
                 .toList();
     }
 

src/main/java/org/mvplugins/multiverse/core/listeners/MVChatListener.java

@@ -16,6 +16,7 @@
 import org.mvplugins.multiverse.core.dynamiclistener.annotations.SkipIfEventExist;
 import org.mvplugins.multiverse.core.utils.text.ChatTextFormatter;
 import org.mvplugins.multiverse.core.world.WorldManager;
+import org.mvplugins.multiverse.core.world.helpers.ConcurrentPlayerWorldTracker;
 
 /**
  * Multiverse's Listener for players.
@@ -24,16 +25,17 @@
 final class MVChatListener implements CoreListener {
     private final CoreConfig config;
     private final WorldManager worldManager;
-    private final MVPlayerListener playerListener;
+    private final ConcurrentPlayerWorldTracker playerWorldTracker;
 
     @Inject
     MVChatListener(
             CoreConfig config,
             WorldManager worldManager,
-            MVPlayerListener playerListener) {
+            ConcurrentPlayerWorldTracker playerWorldTracker
+    ) {
         this.config = config;
         this.worldManager = worldManager;
-        this.playerListener = playerListener;
+        this.playerWorldTracker = playerWorldTracker;
     }
 
     @EventClass("io.papermc.paper.event.player.AsyncChatEvent")
@@ -94,12 +96,9 @@
     }
 
     private String getWorldName(Player player) {
-        String world = playerListener.getPlayerWorld().get(player.getName());
-        if (world == null) {
-            world = player.getWorld().getName();
-            playerListener.getPlayerWorld().put(player.getName(), world);
-        }
-        return this.worldManager.getLoadedWorld(world)
+        String worldName = playerWorldTracker.getPlayerWorld(player.getName())
+                .getOrElse(() -> player.getWorld().getName());
+        return this.worldManager.getLoadedWorld(worldName)
                 .map(mvworld -> mvworld.isHidden() ? "" : mvworld.getAliasOrName())
                 .getOrElse("");
     }

src/main/java/org/mvplugins/multiverse/core/listeners/MVPlayerListener.java

@@ -73,8 +73,6 @@ final class MVPlayerListener implements CoreListener {
     private final DimensionFinder dimensionFinder;
     private final CorePermissionsChecker corePermissionsChecker;
 
-    private final Map<String, String> playerWorld = new ConcurrentHashMap<>();
-
     @Inject
     MVPlayerListener(
             MultiverseCore plugin,
@@ -117,15 +115,6 @@ private PluginLocales getLocales() {
         return getCommandManager().getLocales();
     }
 
-    /**
-     * Gets the map of player and the world name they are in.
-     *
-     * @return the playerWorld-map
-     */
-    Map<String, String> getPlayerWorld() {
-        return playerWorld;
-    }
-
     /**
      * This method is called when a player respawns.
      *
@@ -274,7 +263,6 @@ private void handleJoinLocation(PlayerSpawnLocationEvent event) {
     void playerChangedWorld(PlayerChangedWorldEvent event) {
         // Permissions now determine whether or not to handle a gamemode.
         this.handleGameModeAndFlight(event.getPlayer(), event.getPlayer().getWorld());
-        playerWorld.put(event.getPlayer().getName(), event.getPlayer().getWorld().getName());
     }
 
     /**

src/main/java/org/mvplugins/multiverse/core/world/helpers/ConcurrentPlayerWorldTracker.java

@@ -0,0 +1,90 @@
+package org.mvplugins.multiverse.core.world.helpers;
+
+import io.vavr.control.Option;
+import jakarta.inject.Inject;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.UnmodifiableView;
+import org.jvnet.hk2.annotations.Service;
+import org.mvplugins.multiverse.core.MultiverseCore;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Tracks which players are in which worlds, using a thread-safe map.
+ * This allows async access to online players list and the world they are in.
+ *
+ * @since 5.4
+ */
+@ApiStatus.AvailableSince("5.4")
+@Service
+public final class ConcurrentPlayerWorldTracker implements Listener {
+
+    private final Map<String, String> playerWorldMap;
+
+    @Inject
+    ConcurrentPlayerWorldTracker(@NotNull MultiverseCore plugin) {
+        this.playerWorldMap = new ConcurrentHashMap<>();
+        plugin.getServer().getPluginManager().registerEvents(this, plugin);
+    }
+
+    /**
+     * Get an unmodifiable collection of all online player names on the server.
+     *
+     * @return Unmodifiable collection of online player names.
+     *
+     * @since 5.4
+     */
+    @ApiStatus.AvailableSince("5.4")
+    @NotNull
+    @UnmodifiableView
+    public Collection<String> getOnlinePlayers() {
+        return Collections.unmodifiableCollection(playerWorldMap.keySet());
+    }
+
+    /**
+     * Get the world name a player is currently in.
+     *
+     * @param playerName Name of the player.
+     * @return World name the player is in, or null if the player is not online.
+     *
+     * @since 5.4
+     */
+    @ApiStatus.AvailableSince("5.4")
+    @NotNull
+    public Option<String> getPlayerWorld(String playerName) {
+        return Option.of(playerWorldMap.get(playerName));
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    private void onPlayerJoin(PlayerJoinEvent event) {
+        setPlayerWorld(event.getPlayer());
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    private void onPlayerChangedWorld(@NotNull PlayerChangedWorldEvent event) {
+        setPlayerWorld(event.getPlayer());
+    }
+
+    private void setPlayerWorld(Player player) {
+        String playerName = player.getName();
+        String worldName = player.getWorld().getName();
+        playerWorldMap.put(playerName, worldName);
+    }
+
+    @EventHandler
+    private void onPlayerQuit(@NotNull PlayerQuitEvent event) {
+        String playerName = event.getPlayer().getName();
+        playerWorldMap.remove(playerName);
+    }
+}