edf4e28afa
Motivation: The expression "not is success" can mean that either the future failed, or it has not yet completed. However, many places where such an expression is used is expecting the future to have completed. Specifically, they are expecting to be able to call `cause()` on the future. It is both more correct, and semantically clearer, to call `isFailed()` instead of `!isSuccess()`. Modification: Change all places that used `!isSuccess()` to mean that the future had failed, to use `isFailed()`. A few places are relying on `isSuccess()` returning `false` for _incomplete_ futures, and these places have been left unchanged. Result: Clearer code, with potentially fewer latent bugs.
97 lines
3.9 KiB
Java
97 lines
3.9 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain a
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* copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package io.netty.example.redis;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelInitializer;
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import io.netty.channel.ChannelPipeline;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.MultithreadEventLoopGroup;
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import io.netty.channel.nio.NioHandler;
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import io.netty.channel.socket.SocketChannel;
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import io.netty.channel.socket.nio.NioSocketChannel;
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import io.netty.handler.codec.redis.RedisArrayAggregator;
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import io.netty.handler.codec.redis.RedisBulkStringAggregator;
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import io.netty.handler.codec.redis.RedisDecoder;
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import io.netty.handler.codec.redis.RedisEncoder;
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import io.netty.util.concurrent.Future;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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/**
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* Simple Redis client that demonstrates Redis commands against a Redis server.
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*/
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public class RedisClient {
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private static final String HOST = System.getProperty("host", "127.0.0.1");
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private static final int PORT = Integer.parseInt(System.getProperty("port", "6379"));
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public static void main(String[] args) throws Exception {
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EventLoopGroup group = new MultithreadEventLoopGroup(NioHandler.newFactory());
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try {
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Bootstrap b = new Bootstrap();
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b.group(group)
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.channel(NioSocketChannel.class)
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.handler(new ChannelInitializer<SocketChannel>() {
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@Override
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protected void initChannel(SocketChannel ch) throws Exception {
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ChannelPipeline p = ch.pipeline();
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p.addLast(new RedisDecoder());
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p.addLast(new RedisBulkStringAggregator());
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p.addLast(new RedisArrayAggregator());
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p.addLast(new RedisEncoder());
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p.addLast(new RedisClientHandler());
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}
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});
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// Start the connection attempt.
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Channel ch = b.connect(HOST, PORT).get();
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// Read commands from the stdin.
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System.out.println("Enter Redis commands (quit to end)");
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Future<Void> lastWriteFuture = null;
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BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
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for (;;) {
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final String input = in.readLine();
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final String line = input != null ? input.trim() : null;
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if (line == null || "quit".equalsIgnoreCase(line)) { // EOF or "quit"
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ch.close().sync();
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break;
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}
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if (line.isEmpty()) { // skip `enter` or `enter` with spaces.
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continue;
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}
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// Sends the received line to the server.
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lastWriteFuture = ch.writeAndFlush(line);
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lastWriteFuture.addListener(future -> {
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if (future.isFailed()) {
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System.err.print("write failed: ");
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future.cause().printStackTrace(System.err);
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}
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});
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}
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// Wait until all messages are flushed before closing the channel.
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if (lastWriteFuture != null) {
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lastWriteFuture.sync();
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}
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} finally {
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group.shutdownGracefully();
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}
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}
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}
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