/*
    * 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.channel.Channel;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.group.ChannelGroup;
  import io.netty.channel.group.DefaultChannelGroup;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.DelimiterBasedFrameDecoder;
  import io.netty.handler.codec.Delimiters;
  import io.netty.handler.codec.string.StringDecoder;
  import io.netty.handler.codec.string.StringEncoder;
  import io.netty.util.concurrent.EventExecutorGroup;
  import org.waarp.commandexec.utils.LocalExecDefaultResult;
  
  /**
   * Creates a newly configured {@link ChannelPipeline} for a new channel for
   * LocalExecServer.
   */
  public class LocalExecServerInitializer
      extends ChannelInitializer<SocketChannel> {
  
    private long delay = LocalExecDefaultResult.MAXWAITPROCESS;
    protected final EventExecutorGroup eventExecutorGroup;
    private final ChannelGroup channelGroup;
  
    /**
     * Constructor with default delay
     *
     * @param eventExecutorGroup
     */
    public LocalExecServerInitializer(
        final EventExecutorGroup eventExecutorGroup) {
      this.eventExecutorGroup = eventExecutorGroup;
      channelGroup =
          new DefaultChannelGroup("LocalExecServer", eventExecutorGroup.next());
    }
  
    /**
     * Constructor with a specific default delay
     *
     * @param newdelay
     * @param eventExecutorGroup
     */
    public LocalExecServerInitializer(final long newdelay,
                                      final EventExecutorGroup eventExecutorGroup) {
      delay = newdelay;
      this.eventExecutorGroup = eventExecutorGroup;
      channelGroup =
          new DefaultChannelGroup("LocalExecServer", eventExecutorGroup.next());
    }
  
    @Override
    public void initChannel(final SocketChannel ch) {
      // Create a default pipeline implementation.
      final ChannelPipeline pipeline = ch.pipeline();
  
      // Add the text line codec combination first,
      pipeline.addLast("framer", new DelimiterBasedFrameDecoder(8192,
                                                                Delimiters.lineDelimiter()));
      pipeline.addLast(eventExecutorGroup, "decoder", new StringDecoder());
      pipeline.addLast(eventExecutorGroup, "encoder", new StringEncoder());
  
      // and then business logic.
      // Could change it with a new fixed delay if necessary at construction
      pipeline.addLast(eventExecutorGroup, "handler",
                       new LocalExecServerHandler(this, delay));
    }
  
    /**
     * Add a channel to the ExecClient Group
     *
     * @param channel
     */
    public final void addChannel(final Channel channel) {
      channelGroup.add(channel);
    }
  
    /**
     * Release internal resources
    */
   public final void releaseResources() {
     channelGroup.close();
   }
 }