com.l2jmobius.gameserver.network.telnet.TelnetServer.java Source code

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Here is the source code for com.l2jmobius.gameserver.network.telnet.TelnetServer.java

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/*
 * This file is part of the L2J Mobius project.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.l2jmobius.gameserver.network.telnet;

import java.net.InetSocketAddress;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.l2jmobius.Config;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;

/**
 * @author UnAfraid
 */
public class TelnetServer {
    private static final Logger LOGGER = Logger.getLogger(TelnetServer.class.getName());
    private final Map<String, ITelnetCommand> _commands = new LinkedHashMap<>();
    private final EventLoopGroup _workerGroup = new NioEventLoopGroup(1);

    protected TelnetServer() {
        if (Config.TELNET_ENABLED) {
            init();
        } else {
            LOGGER.info("Telnet server is currently disabled.");
        }
    }

    public void init() {
        addHandler(new ITelnetCommand() {
            @Override
            public String getCommand() {
                return "help";
            }

            @Override
            public String getUsage() {
                return "help [command]";
            }

            @Override
            public String handle(ChannelHandlerContext ctx, String[] args) {
                if (args.length == 0) {
                    final StringBuilder sb = new StringBuilder("Available commands:" + Config.EOL);
                    for (ITelnetCommand cmd : TelnetServer.getInstance().getCommands()) {
                        sb.append(cmd.getCommand() + Config.EOL);
                    }
                    return sb.toString();
                }
                final ITelnetCommand cmd = TelnetServer.getInstance().getCommand(args[0]);
                if (cmd == null) {
                    return "Unknown command." + Config.EOL;
                }
                return "Usage:" + Config.EOL + cmd.getUsage() + Config.EOL;
            }
        });

        try {
            final InetSocketAddress socket = Config.TELNET_HOSTNAME.equals("*")
                    ? new InetSocketAddress(Config.TELNET_PORT)
                    : new InetSocketAddress(Config.TELNET_HOSTNAME, Config.TELNET_PORT);
            //@formatter:off
            new ServerBootstrap().group(_workerGroup).channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_KEEPALIVE, true).childHandler(new TelnetServerInitializer())
                    .bind(socket);
            //@formatter:on
            LOGGER.info(getClass().getSimpleName() + ": Listening on " + Config.TELNET_HOSTNAME + ":"
                    + Config.TELNET_PORT);
        } catch (Exception e) {
            LOGGER.log(Level.WARNING, e.getMessage(), e);
        }
    }

    public void addHandler(ITelnetCommand handler) {
        _commands.put(handler.getCommand(), handler);
    }

    public ITelnetCommand getCommand(String command) {
        return _commands.get(command);
    }

    public Collection<ITelnetCommand> getCommands() {
        return _commands.values();
    }

    public void shutdown() {
        _workerGroup.shutdownGracefully();
        LOGGER.info("Shutting down..");
    }

    public static TelnetServer getInstance() {
        return SingletonHolder._instance;
    }

    private static class SingletonHolder {
        protected static final TelnetServer _instance = new TelnetServer();
    }
}