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Java example source code file (RedisClient.java)

This example Java source code file (RedisClient.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bootstrap, bufferedreader, channelfuture, eof, exception, host, nioeventloopgroup, override, port, redisarrayaggregator, redisbulkstringaggregator, redisclienthandler, redisdecoder, string

The RedisClient.java Java example source code

/*
 * 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:
 *
 * 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.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();
        }
    }
}

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