/*
    * This file is part of Waarp Project (named also Waarp or GG).
    *
    *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
    *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
    * individual contributors.
    *
    *  All Waarp Project 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.
   *
   * Waarp 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
   * Waarp . If not, see <http://www.gnu.org/licenses/>.
   */
  package org.waarp.commandexec.server;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.util.concurrent.DefaultEventExecutorGroup;
  import io.netty.util.concurrent.EventExecutorGroup;
  import org.waarp.commandexec.utils.LocalExecDefaultResult;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.common.logging.WaarpSlf4JLoggerFactory;
  import org.waarp.common.utility.DetectionUtils;
  import org.waarp.common.utility.WaarpNettyUtil;
  import org.waarp.common.utility.WaarpThreadFactory;
  
  import java.net.InetAddress;
  import java.net.InetSocketAddress;
  
  /**
   * LocalExec server Main method.
   */
  public class LocalExecServer {
  
    static final EventLoopGroup workerGroup = new NioEventLoopGroup();
    static final EventExecutorGroup executor =
        new DefaultEventExecutorGroup(DetectionUtils.numberThreads(),
                                      new WaarpThreadFactory("LocalExecServer"));
  
    /**
     * Takes 3 optional arguments:<br>
     * - no argument: implies 127.0.0.1 + 9999 port<br>
     * - arguments:<br>
     * "addresse" "port"<br>
     * "addresse" "port" "default delay"<br>
     *
     * @param args
     *
     * @throws Exception
     */
    public static void main(final String[] args) throws Exception {
      WaarpLoggerFactory.setDefaultFactoryIfNotSame(
          new WaarpSlf4JLoggerFactory(null));
      int port = 9999;
      final InetAddress addr;
      long delay = LocalExecDefaultResult.MAXWAITPROCESS;
      if (args.length >= 2) {
        addr = InetAddress.getByName(args[0]);
        port = Integer.parseInt(args[1]);
        if (args.length > 2) {
          delay = Long.parseLong(args[2]);
        }
      } else {
        final byte[] loop = { 127, 0, 0, 1 };
        addr = InetAddress.getByAddress(loop);
      }
      // Configure the server.
      try {
        final ServerBootstrap bootstrap = new ServerBootstrap();
        WaarpNettyUtil.setServerBootstrap(bootstrap, workerGroup, workerGroup,
                                          30000);
  
        // Configure the pipeline factory.
        bootstrap.childHandler(new LocalExecServerInitializer(delay, executor));
  
        // Bind and start to accept incoming connections only on local address.
        final ChannelFuture future =
            bootstrap.bind(new InetSocketAddress(addr, port));
  
        // Wait until the server socket is closed.
        future.channel().closeFuture().sync();
      } finally {
        // Shut down all event loops to terminate all threads.
        workerGroup.shutdownGracefully();
  
        // Wait until all threads are terminated.
        workerGroup.terminationFuture().sync();
      }
    }
  }