/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.udt.echo.message;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.udt.UdtChannel;
import io.netty.channel.udt.nio.NioUdtProvider;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.util.concurrent.DefaultExecutorServiceFactory;
import io.netty.util.concurrent.ExecutorServiceFactory;

/**
 * UDT Message Flow Server
 * <p>
 * Echoes back any received data from a client.
 */
public final class MsgEchoServer {

    static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));

    public static void main(String[] args) throws Exception {
        final ExecutorServiceFactory acceptFactory = new DefaultExecutorServiceFactory("accept");
        final ExecutorServiceFactory connectFactory = new DefaultExecutorServiceFactory("connect");
        final NioEventLoopGroup acceptGroup =
                new NioEventLoopGroup(1, acceptFactory, NioUdtProvider.MESSAGE_PROVIDER);
        final NioEventLoopGroup connectGroup =
                new NioEventLoopGroup(1, connectFactory, NioUdtProvider.MESSAGE_PROVIDER);

        // Configure the server.
        try {
            final ServerBootstrap boot = new ServerBootstrap();
            boot.group(acceptGroup, connectGroup)
                    .channelFactory(NioUdtProvider.MESSAGE_ACCEPTOR)
                    .option(ChannelOption.SO_BACKLOG, 10)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<UdtChannel>() {
                        @Override
                        public void initChannel(final UdtChannel ch)
                                throws Exception {
                            ch.pipeline().addLast(
                                    new LoggingHandler(LogLevel.INFO),
                                    new MsgEchoServerHandler());
                        }
                    });
            // Start the server.
            final ChannelFuture future = boot.bind(PORT).sync();
            // Wait until the server socket is closed.
            future.channel().closeFuture().sync();
        } finally {
            // Shut down all event loops to terminate all threads.
            acceptGroup.shutdownGracefully();
            connectGroup.shutdownGracefully();
        }
    }
}
