/*
    * 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:
    *
    *   https://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.uptime;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelFutureListener;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.timeout.IdleStateHandler;
  
  
  /**
   * Connects to a server periodically to measure and print the uptime of the
   * server.  This example demonstrates how to implement reliable reconnection
   * mechanism in Netty.
   */
  public final class UptimeClient {
  
      static final String HOST = System.getProperty("host", "127.0.0.1");
      static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
      // Sleep 5 seconds before a reconnection attempt.
      static final int RECONNECT_DELAY = Integer.parseInt(System.getProperty("reconnectDelay", "5"));
      // Reconnect when the server sends nothing for 10 seconds.
      private static final int READ_TIMEOUT = Integer.parseInt(System.getProperty("readTimeout", "10"));
  
      private static final UptimeClientHandler handler = new UptimeClientHandler();
      private static final Bootstrap bs = new Bootstrap();
  
      public static void main(String[] args) throws Exception {
          EventLoopGroup group = new NioEventLoopGroup();
          bs.group(group)
                  .channel(NioSocketChannel.class)
                  .remoteAddress(HOST, PORT)
                  .handler(new ChannelInitializer<SocketChannel>() {
                      @Override
                      protected void initChannel(SocketChannel ch) throws Exception {
                          ch.pipeline().addLast(new IdleStateHandler(READ_TIMEOUT, 0, 0), handler);
                      }
                  });
          bs.connect();
      }
  
      static void connect() {
          bs.connect().addListener(new ChannelFutureListener() {
              @Override
              public void operationComplete(ChannelFuture future) throws Exception {
                  if (future.cause() != null) {
                      handler.startTime = -1;
                      handler.println("Failed to connect: " + future.cause());
                  }
              }
          });
      }
  }