Remove LinkedList usage

https://twitter.com/joshbloch/status/583813919019573248

src/main/java/emu/grasscutter/command/CommandMap.java

@@ -89,7 +89,7 @@ public final class CommandMap {
     }
 
     public List<Command> getAnnotationsAsList() {
-        return new LinkedList<>(this.annotations.values());
+        return new ArrayList<>(this.annotations.values());
     }
 
     public Map<String, Command> getAnnotations() {
@@ -102,7 +102,7 @@ public final class CommandMap {
      * @return All command handlers as a list.
      */
     public List<CommandHandler> getHandlersAsList() {
-        return new LinkedList<>(this.commands.values());
+        return new ArrayList<>(this.commands.values());
     }
 
     public Map<String, CommandHandler> getHandlers() {
@@ -234,8 +234,8 @@ public final class CommandMap {
 
         // Parse message.
         String[] split = rawMessage.split(" ");
-        List<String> args = new LinkedList<>(Arrays.asList(split));
-        String label = args.remove(0).toLowerCase();
+        String label = split[0].toLowerCase();
+        List<String> args = new ArrayList<>(Arrays.asList(split).subList(1, split.length));
         String playerId = (player == null) ? consoleId : player.getAccount().getId();
 
         // Check for special cases - currently only target command.

src/main/java/emu/grasscutter/game/player/PlayerBuffManager.java

 package emu.grasscutter.game.player;
 
-import java.util.LinkedList;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 
@@ -15,11 +15,8 @@ import emu.grasscutter.server.packet.send.PacketServerBuffChangeNotify;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 
-import lombok.AccessLevel;
 import lombok.Getter;
-import lombok.val;
 
-@Getter(AccessLevel.PRIVATE)
 public class PlayerBuffManager extends BasePlayerManager {
     private int nextBuffUid;
 
@@ -29,7 +26,7 @@ public class PlayerBuffManager extends BasePlayerManager {
     public PlayerBuffManager(Player player) {
         super(player);
         this.buffs = new Int2ObjectOpenHashMap<>();
-        this.pendingBuffs = new LinkedList<>();
+        this.pendingBuffs = new ArrayList<>();
     }
 
     /**
@@ -46,7 +43,7 @@ public class PlayerBuffManager extends BasePlayerManager {
      * @return True if a buff with this group id exists
      */
     public synchronized boolean hasBuff(int groupId) {
-        return this.getBuffs().containsKey(groupId);
+        return this.buffs.containsKey(groupId);
     }
 
     /**
@@ -55,11 +52,11 @@ public class PlayerBuffManager extends BasePlayerManager {
     public synchronized void clearBuffs() {
         // Remove from player
         getPlayer().sendPacket(
-            new PacketServerBuffChangeNotify(getPlayer(), ServerBuffChangeType.SERVER_BUFF_CHANGE_TYPE_DEL_SERVER_BUFF, getBuffs().values())
+            new PacketServerBuffChangeNotify(getPlayer(), ServerBuffChangeType.SERVER_BUFF_CHANGE_TYPE_DEL_SERVER_BUFF, this.buffs.values())
         );
 
         // Clear
-        getBuffs().clear();
+        this.buffs.clear();
     }
 
     /**
@@ -139,7 +136,7 @@ public class PlayerBuffManager extends BasePlayerManager {
 
         // Create and store buff
         PlayerBuff buff = new PlayerBuff(getNextBuffUid(), buffData, duration);
-        getBuffs().put(buff.getGroupId(), buff);
+        this.buffs.put(buff.getGroupId(), buff);
 
         // Packet
         getPlayer().sendPacket(new PacketServerBuffChangeNotify(getPlayer(), ServerBuffChangeType.SERVER_BUFF_CHANGE_TYPE_ADD_SERVER_BUFF, buff));
@@ -153,7 +150,7 @@ public class PlayerBuffManager extends BasePlayerManager {
      * @return True if a buff was remove
      */
     public synchronized boolean removeBuff(int buffGroupId) {
-        PlayerBuff buff = this.getBuffs().get(buffGroupId);
+        PlayerBuff buff = this.buffs.get(buffGroupId);
 
         if (buff != null) {
             getPlayer().sendPacket(
@@ -167,28 +164,24 @@ public class PlayerBuffManager extends BasePlayerManager {
 
     public synchronized void onTick() {
         // Skip if no buffs
-        if (getBuffs().size() == 0) return;
+        if (this.buffs.isEmpty()) return;
 
         long currentTime = System.currentTimeMillis();
 
         // Add to pending buffs to remove if buff has expired
-        for (PlayerBuff buff : getBuffs().values()) {
-            if (currentTime > buff.getEndTime()) {
-                this.getPendingBuffs().add(buff);
-            }
-        }
+        this.buffs.values().removeIf(buff -> {
+            if (currentTime <= buff.getEndTime())
+                return false;
+            this.pendingBuffs.add(buff);
+            return true;
+        });
 
-        if (this.getPendingBuffs().size() > 0) {
+        if (this.pendingBuffs.size() > 0) {
             // Send packet
             getPlayer().sendPacket(
                 new PacketServerBuffChangeNotify(getPlayer(), ServerBuffChangeType.SERVER_BUFF_CHANGE_TYPE_DEL_SERVER_BUFF, this.pendingBuffs)
             );
-
-            // Remove buff from player buff map
-            for (PlayerBuff buff : this.getPendingBuffs()) {
-                getBuffs().remove(buff.getGroupId());
-            }
-            this.getPendingBuffs().clear();
+            this.pendingBuffs.clear();
         }
     }
 

src/main/java/emu/grasscutter/game/world/Scene.java

@@ -274,15 +274,8 @@ public class Scene {
     }
 
     public void showOtherEntities(Player player) {
-        List<GameEntity> entities = new LinkedList<>();
         GameEntity currentEntity = player.getTeamManager().getCurrentAvatarEntity();
-
-        for (GameEntity entity : this.getEntities().values()) {
-            if (entity == currentEntity) {
-                continue;
-            }
-            entities.add(entity);
-        }
+        List<GameEntity> entities = this.getEntities().values().stream().filter(entity -> entity != currentEntity).toList();
 
         player.sendPacket(new PacketSceneEntityAppearNotify(entities, VisionType.VISION_TYPE_MEET));
     }
@@ -422,8 +415,8 @@ public class Scene {
         }
 
         // Todo
-        List<GameEntity> toAdd = new LinkedList<>();
-        List<GameEntity> toRemove = new LinkedList<>();
+        List<GameEntity> toAdd = new ArrayList<>();
+        List<GameEntity> toRemove = new ArrayList<>();
         var spawnedEntities = this.getSpawnedEntities();
         for (SpawnDataEntry entry : visible) {
             // If spawn entry is in our view and hasnt been spawned/killed yet, we should spawn it

src/main/java/emu/grasscutter/plugin/PluginManager.java

@@ -181,7 +181,7 @@ public final class PluginManager {
         // Add the plugin to the list of loaded plugins.
         this.plugins.put(identifier.name, plugin);
         // Create a collection for the plugin's listeners.
-        this.listeners.put(plugin, new LinkedList<>());
+        this.listeners.put(plugin, new ArrayList<>());
 
         // Call the plugin's onLoad method.
         try {
@@ -242,18 +242,14 @@ public final class PluginManager {
      * @param priority The priority to call for.
      */
     private void checkAndFilter(Event event, HandlerPriority priority) {
-        // Create a collection of listeners.
-        List<EventHandler<? extends Event>> listeners = new LinkedList<>();
-
         // Add all listeners from every plugin.
-        this.listeners.values().forEach(listeners::addAll);
-
-        listeners.stream()
+        this.listeners.values().stream()
+            .flatMap(Collection::stream)
             // Filter the listeners by priority.
             .filter(handler -> handler.handles().isInstance(event))
             .filter(handler -> handler.getPriority() == priority)
             // Invoke the event.
-            .toList().forEach(handler -> this.invokeHandler(event, handler));
+            .forEach(handler -> this.invokeHandler(event, handler));
     }
 
     /**

src/main/java/emu/grasscutter/plugin/api/ServerHook.java

@@ -11,8 +11,9 @@ import emu.grasscutter.server.game.GameServer;
 import emu.grasscutter.server.http.HttpServer;
 import emu.grasscutter.server.http.Router;
 
-import java.util.LinkedList;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Stream;
 
 /**
  * Hooks into the {@link GameServer} class, adding convenient ways to do certain things.
@@ -60,8 +61,17 @@ public final class ServerHook {
      * Gets all online players.
      * @return Players connected to the server.
      */
+    @Deprecated(forRemoval = true)
     public List<Player> getOnlinePlayers() {
-        return new LinkedList<>(this.gameServer.getPlayers().values());
+        return new ArrayList<>(this.gameServer.getPlayers().values());
+    }
+
+    /**
+     * Gets all online players.
+     * @return Players connected to the server.
+     */
+    public Stream<Player> getOnlinePlayersStream() {
+        return this.gameServer.getPlayers().values().stream();
     }
 
     /**

src/main/java/emu/grasscutter/server/packet/send/PacketServerBuffChangeNotify.java

 package emu.grasscutter.server.packet.send;
 
 import java.util.Collection;
+import java.util.stream.Stream;
 
-import emu.grasscutter.game.entity.EntityAvatar;
 import emu.grasscutter.game.player.Player;
 import emu.grasscutter.game.player.PlayerBuffManager.PlayerBuff;
 import emu.grasscutter.net.packet.BasePacket;
@@ -13,31 +13,25 @@ import emu.grasscutter.net.proto.ServerBuffChangeNotifyOuterClass.ServerBuffChan
 public class PacketServerBuffChangeNotify extends BasePacket {
 
     public PacketServerBuffChangeNotify(Player player, ServerBuffChangeType changeType, PlayerBuff buff) {
-        super(PacketOpcodes.ServerBuffChangeNotify);
-
-        var proto = ServerBuffChangeNotify.newBuilder();
-
-        for (EntityAvatar entity : player.getTeamManager().getActiveTeam()) {
-            proto.addAvatarGuidList(entity.getAvatar().getGuid());
-        }
-
-        proto.setServerBuffChangeType(changeType);
-        proto.addServerBuffList(buff.toProto());
-
-        this.setData(proto);
+        this(player, changeType, Stream.of(buff));
     }
 
     public PacketServerBuffChangeNotify(Player player, ServerBuffChangeType changeType, Collection<PlayerBuff> buffs) {
+        this(player, changeType, buffs.stream());
+    }
+
+    public PacketServerBuffChangeNotify(Player player, ServerBuffChangeType changeType, Stream<PlayerBuff> buffs) {
         super(PacketOpcodes.ServerBuffChangeNotify);
 
         var proto = ServerBuffChangeNotify.newBuilder();
 
-        for (EntityAvatar entity : player.getTeamManager().getActiveTeam()) {
-            proto.addAvatarGuidList(entity.getAvatar().getGuid());
-        }
+        player.getTeamManager().getActiveTeam().stream()
+            .mapToLong(entity -> entity.getAvatar().getGuid())
+            .forEach(proto::addAvatarGuidList);
 
         proto.setServerBuffChangeType(changeType);
-        proto.addAllServerBuffList(buffs.stream().map(PlayerBuff::toProto).toList());
+        buffs.map(PlayerBuff::toProto)
+            .forEach(proto::addServerBuffList);
 
         this.setData(proto);
     }

src/main/java/emu/grasscutter/task/TaskMap.java

@@ -133,7 +133,7 @@ public final class TaskMap {
     }
 
     public List<TaskHandler> getHandlersAsList() {
-        return new LinkedList<>(this.tasks.values());
+        return new ArrayList<>(this.tasks.values());
     }
 
     public HashMap<String, TaskHandler> getHandlers() {