com.opentable.logging.RedisServerRule.java Source code

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Here is the source code for com.opentable.logging.RedisServerRule.java

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/*
 * Licensed 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 com.opentable.logging;

import java.net.ServerSocket;

import org.junit.rules.ExternalResource;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.concurrent.DefaultEventExecutorGroup;
import redis.server.netty.RedisCommandDecoder;
import redis.server.netty.RedisCommandHandler;
import redis.server.netty.RedisReplyEncoder;
import redis.server.netty.SimpleRedisServer;

public class RedisServerRule extends ExternalResource {

    private int port = -1;
    private ServerBootstrap b;
    private DefaultEventExecutorGroup group;

    @Override
    protected void before() throws Throwable {
        try (ServerSocket ss = new ServerSocket(0)) {
            port = ss.getLocalPort();
        }

        // Only execute the command handler in a single thread
        final RedisCommandHandler commandHandler = new RedisCommandHandler(new SimpleRedisServer());

        b = new ServerBootstrap();
        group = new DefaultEventExecutorGroup(1);
        b.group(new NioEventLoopGroup(), new NioEventLoopGroup()).channel(NioServerSocketChannel.class)
                .option(ChannelOption.SO_BACKLOG, 100).localAddress(port)
                .childOption(ChannelOption.TCP_NODELAY, true).childHandler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    public void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline p = ch.pipeline();
                        //                 p.addLast(new ByteLoggingHandler(LogLevel.INFO));
                        p.addLast(new RedisCommandDecoder());
                        p.addLast(new RedisReplyEncoder());
                        p.addLast(group, commandHandler);
                    }
                });

        // Start the server.
        b.bind().sync();
    }

    @Override
    protected void after() {
        group.shutdownGracefully();
    }

    public int getPort() {
        if (port <= 0) {
            throw new IllegalStateException("Didn't have a valid port: " + port);
        }
        return port;
    }
}