Properly interface ServerInfo class.

api/src/main/java/net/md_5/bungee/api/config/ServerInfo.java

@@ -1,13 +1,7 @@
 package net.md_5.bungee.api.config;
 
 import java.net.InetSocketAddress;
-import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
-import java.util.Objects;
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.Synchronized;
 import net.md_5.bungee.api.Callback;
 import net.md_5.bungee.api.CommandSender;
 import net.md_5.bungee.api.ServerPing;
@@ -16,60 +10,40 @@ import net.md_5.bungee.api.connection.ProxiedPlayer;
 /**
  * Class used to represent a server to connect to.
  */
-@Data
-@AllArgsConstructor
-public abstract class ServerInfo
+public interface ServerInfo
 {
 
     /**
-     * Name this server displays as.
+     * Get the name of this server.
+     *
+     * @return the configured name for this server address
      */
-    private final String name;
-    /**
-     * Connectable address of this server.
-     */
-    private final InetSocketAddress address;
-    /**
-     * Players connected to a server defined by these properties.
-     */
-    private final Collection<ProxiedPlayer> players = new ArrayList<>();
-    /**
-     * If set to true, users will need special permissions to view this server.
-     */
-    private final boolean restricted;
+    String getName();
 
     /**
-     * Add a player to the internal set of this server.
+     * Gets the connectable host + port pair for this server. Implementations
+     * expect this to be used as the unique identifier per each instance of this
+     * class.
      *
-     * @param player the player to add
+     * @return the IP and port pair for this server
      */
-    @Synchronized("players")
-    public void addPlayer(ProxiedPlayer player)
-    {
-        players.add( player );
-    }
-
-    /**
-     * Remove a player form the internal set of this server.
-     *
-     * @param player the player to remove
-     */
-    @Synchronized("players")
-    public void removePlayer(ProxiedPlayer player)
-    {
-        players.remove( player );
-    }
+    InetSocketAddress getAddress();
 
     /**
      * Get the set of all players on this server.
      *
      * @return an unmodifiable collection of all players on this server
      */
-    @Synchronized("players")
-    public Collection<ProxiedPlayer> getPlayers()
-    {
-        return Collections.unmodifiableCollection( players );
-    }
+    Collection<ProxiedPlayer> getPlayers();
+
+    /**
+     * Whether the player can access this server. It will only return false when
+     * the player has no permission and this server is restricted.
+     *
+     * @param sender the player to check access for
+     * @return whether access is granted to this server
+     */
+    boolean canAccess(CommandSender sender);
 
     /**
      * Send data by any available means to this server.
@@ -77,39 +51,12 @@ public abstract class ServerInfo
      * @param channel the channel to send this data via
      * @param data the data to send
      */
-    public abstract void sendData(String channel, byte[] data);
+    void sendData(String channel, byte[] data);
 
     /**
      * Asynchronously gets the current player count on this server.
      *
      * @param callback the callback to call when the count has been retrieved.
      */
-    public abstract void ping(Callback<ServerPing> callback);
-
-    /**
-     * Whether the player can access this server. It will only return false when
-     * the player has no permission and this server is restricted.
-     *
-     * @param player the player to check access for
-     * @return whether access is granted to this server
-     */
-    public boolean canAccess(CommandSender player)
-    {
-        return !restricted || player.hasPermission( "bungeecord.server." + name );
-    }
-
-    @Override
-    public boolean equals(Object obj)
-    {
-        return ( obj instanceof ServerInfo ) && Objects.equals( getAddress(), ( (ServerInfo) obj ).getAddress() );
-    }
-
-    @Override
-    public int hashCode()
-    {
-        int hash = 7;
-        hash = 73 * hash + Objects.hashCode( getClass() );
-        hash = 73 * hash + Objects.hashCode( getAddress() );
-        return hash;
-    }
+    void ping(Callback<ServerPing> callback);
 }

proxy/src/main/java/net/md_5/bungee/BungeeServerInfo.java

@@ -6,13 +6,21 @@ import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelOption;
 import io.netty.channel.socket.nio.NioSocketChannel;
 import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Objects;
 import java.util.Queue;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Synchronized;
 import net.md_5.bungee.api.Callback;
+import net.md_5.bungee.api.CommandSender;
 import net.md_5.bungee.api.ProxyServer;
 import net.md_5.bungee.api.ServerPing;
 import net.md_5.bungee.api.config.ServerInfo;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
 import net.md_5.bungee.api.connection.Server;
 import net.md_5.bungee.connection.PingHandler;
 import net.md_5.bungee.netty.HandlerBoss;
@@ -20,15 +28,55 @@ import net.md_5.bungee.netty.PipelineUtils;
 import net.md_5.bungee.packet.DefinedPacket;
 import net.md_5.bungee.packet.PacketFAPluginMessage;
 
-public class BungeeServerInfo extends ServerInfo
+@RequiredArgsConstructor
+public class BungeeServerInfo implements ServerInfo
 {
 
+    @Getter
+    private final String name;
+    @Getter
+    private final InetSocketAddress address;
+    private final Collection<ProxiedPlayer> players = new ArrayList<>();
+    @Getter
+    private final boolean restricted;
     @Getter
     private final Queue<DefinedPacket> packetQueue = new ConcurrentLinkedQueue<>();
 
-    public BungeeServerInfo(String name, InetSocketAddress address, boolean restricted)
+    @Synchronized("players")
+    public void addPlayer(ProxiedPlayer player)
     {
-        super( name, address, restricted );
+        players.add( player );
+    }
+
+    @Synchronized("players")
+    public void removePlayer(ProxiedPlayer player)
+    {
+        players.remove( player );
+    }
+
+    @Synchronized("players")
+    @Override
+    public Collection<ProxiedPlayer> getPlayers()
+    {
+        return Collections.unmodifiableCollection( players );
+    }
+
+    @Override
+    public boolean canAccess(CommandSender player)
+    {
+        return !restricted || player.hasPermission( "bungeecord.server." + name );
+    }
+
+    @Override
+    public boolean equals(Object obj)
+    {
+        return ( obj instanceof ServerInfo ) && Objects.equals( getAddress(), ( (ServerInfo) obj ).getAddress() );
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return address.hashCode();
     }
 
     @Override

proxy/src/main/java/net/md_5/bungee/ServerConnection.java

@@ -6,7 +6,6 @@ import java.util.concurrent.TimeUnit;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 import lombok.Setter;
-import net.md_5.bungee.api.config.ServerInfo;
 import net.md_5.bungee.api.connection.Server;
 import net.md_5.bungee.packet.Packet1Login;
 import net.md_5.bungee.packet.PacketFAPluginMessage;
@@ -19,7 +18,7 @@ public class ServerConnection implements Server
     @Getter
     private final Channel ch;
     @Getter
-    private final ServerInfo info;
+    private final BungeeServerInfo info;
     @Getter
     private final Packet1Login loginPacket;
     @Getter

proxy/src/main/java/net/md_5/bungee/ServerConnector.java

@@ -36,7 +36,7 @@ public class ServerConnector extends PacketHandler
     private final ProxyServer bungee;
     private Channel ch;
     private final UserConnection user;
-    private final ServerInfo target;
+    private final BungeeServerInfo target;
     private State thisState = State.ENCRYPT_REQUEST;
 
     private enum State

proxy/src/main/java/net/md_5/bungee/UserConnection.java

@@ -118,7 +118,10 @@ public final class UserConnection implements ProxiedPlayer
     {
         ServerConnectEvent event = new ServerConnectEvent( this, info );
         ProxyServer.getInstance().getPluginManager().callEvent( event );
-        final ServerInfo target = event.getTarget(); // Update in case the event changed target
+
+        Preconditions.checkArgument( event.getTarget() instanceof BungeeServerInfo, "BungeeCord can only connect to BungeeServerInfo instances" );
+        final BungeeServerInfo target = (BungeeServerInfo) event.getTarget(); // Update in case the event changed target
+
         if ( getServer() != null && Objects.equals( getServer().getInfo(), target ) )
         {
             sendMessage( ChatColor.RED + "Cannot connect to server you are already on!" );

proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java

@@ -9,12 +9,12 @@ import io.netty.handler.timeout.ReadTimeoutHandler;
 import io.netty.util.AttributeKey;
 import java.util.concurrent.TimeUnit;
 import net.md_5.bungee.BungeeCord;
+import net.md_5.bungee.BungeeServerInfo;
 import net.md_5.bungee.ServerConnector;
 import net.md_5.bungee.UserConnection;
 import net.md_5.bungee.connection.InitialHandler;
 import net.md_5.bungee.api.ProxyServer;
 import net.md_5.bungee.api.config.ListenerInfo;
-import net.md_5.bungee.api.config.ServerInfo;
 import net.md_5.bungee.protocol.PacketDefinitions;
 
 public class PipelineUtils
@@ -22,7 +22,7 @@ public class PipelineUtils
 
     public static final AttributeKey<ListenerInfo> LISTENER = new AttributeKey<>( "ListerInfo" );
     public static final AttributeKey<UserConnection> USER = new AttributeKey<>( "User" );
-    public static final AttributeKey<ServerInfo> TARGET = new AttributeKey<>( "Target" );
+    public static final AttributeKey<BungeeServerInfo> TARGET = new AttributeKey<>( "Target" );
     public static final ChannelInitializer<Channel> SERVER_CHILD = new ChannelInitializer<Channel>()
     {
         @Override