/*
    * Copyright 2014 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.memcache.binary;
  
  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.MultiThreadIoEventLoopGroup;
  import io.netty.channel.nio.NioIoHandler;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.codec.memcache.binary.BinaryMemcacheClientCodec;
  import io.netty.handler.codec.memcache.binary.BinaryMemcacheObjectAggregator;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
  
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  
  /**
   * Simple memcache client that demonstrates get and set commands against a memcache server.
   */
  public final class MemcacheClient {
  
      static final boolean SSL = System.getProperty("ssl") != null;
      static final String HOST = System.getProperty("host", "127.0.0.1");
      static final int PORT = Integer.parseInt(System.getProperty("port", "11211"));
  
      public static void main(String[] args) throws Exception {
          // Configure SSL.
          final SslContext sslCtx;
          if (SSL) {
              sslCtx = SslContextBuilder.forClient()
                  .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
          } else {
              sslCtx = null;
          }
  
          EventLoopGroup group = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());
          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();
                              if (sslCtx != null) {
                                  p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
                              }
                              p.addLast(new BinaryMemcacheClientCodec());
                              p.addLast(new BinaryMemcacheObjectAggregator(Integer.MAX_VALUE));
                              p.addLast(new MemcacheClientHandler());
                          }
                      });
  
              // Start the connection attempt.
              Channel ch = b.connect(HOST, PORT).sync().channel();
  
              // Read commands from the stdin.
              System.out.println("Enter commands (quit to end)");
              System.out.println("get <key>");
              System.out.println("set <key> <value>");
              ChannelFuture lastWriteFuture = null;
              BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
              for (;;) {
                  String line = in.readLine();
                  if (line == null) {
                      break;
                  }
                  if ("quit".equals(line.toLowerCase())) {
                      ch.close().sync();
                      break;
                  }
                  // Sends the received line to the server.
                  lastWriteFuture = ch.writeAndFlush(line);
              }
  
              // Wait until all messages are flushed before closing the channel.
              if (lastWriteFuture != null) {
                  lastWriteFuture.sync();
              }
         } finally {
             group.shutdownGracefully();
         }
     }
 }