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   /*
    * Copyright 2016 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.redis;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  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.codec.redis.RedisArrayAggregator;
  import io.netty.handler.codec.redis.RedisBulkStringAggregator;
  import io.netty.handler.codec.redis.RedisDecoder;
  import io.netty.handler.codec.redis.RedisEncoder;
  import io.netty.util.concurrent.GenericFutureListener;
  
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  
  /**
   * Simple Redis client that demonstrates Redis commands against a Redis server.
   */
  public class RedisClient {
      private static final String HOST = System.getProperty("host", "127.0.0.1");
      private static final int PORT = Integer.parseInt(System.getProperty("port", "6379"));
  
      public static void main(String[] args) throws Exception {
          EventLoopGroup group = new NioEventLoopGroup();
          try {
              Bootstrap b = new Bootstrap();
              b.group(group)
               .channel(NioSocketChannel.class)
               .handler(new ChannelInitializer<SocketChannel>() {
                   @Override
                   protected void initChannel(SocketChannel ch) throws Exception {
                       ChannelPipeline p = ch.pipeline();
                       p.addLast(new RedisDecoder());
                       p.addLast(new RedisBulkStringAggregator());
                       p.addLast(new RedisArrayAggregator());
                       p.addLast(new RedisEncoder());
                       p.addLast(new RedisClientHandler());
                   }
               });
  
              // Start the connection attempt.
              Channel ch = b.connect(HOST, PORT).sync().channel();
  
              // Read commands from the stdin.
              System.out.println("Enter Redis commands (quit to end)");
              ChannelFuture lastWriteFuture = null;
              BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
              for (;;) {
                  final String input = in.readLine();
                  final String line = input != null ? input.trim() : null;
                  if (line == null || "quit".equalsIgnoreCase(line)) { // EOF or "quit"
                      ch.close().sync();
                      break;
                  } else if (line.isEmpty()) { // skip `enter` or `enter` with spaces.
                      continue;
                  }
                  // Sends the received line to the server.
                  lastWriteFuture = ch.writeAndFlush(line);
                  lastWriteFuture.addListener(new GenericFutureListener<ChannelFuture>() {
                      @Override
                      public void operationComplete(ChannelFuture future) throws Exception {
                          if (!future.isSuccess()) {
                              System.err.print("write failed: ");
                              future.cause().printStackTrace(System.err);
                          }
                      }
                  });
              }
  
              // Wait until all messages are flushed before closing the channel.
              if (lastWriteFuture != null) {
                  lastWriteFuture.sync();
              }
          } finally {
              group.shutdownGracefully();
          }
      }
  }