HttpServer.java

/*
 * Copyright 2016 the original author or authors.
 *
 * 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 org.glowroot.agent.plugin.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
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.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

class HttpServer {

    private final EventLoopGroup bossGroup;
    private final EventLoopGroup workerGroup;
    private final Channel channel;

    HttpServer(int port) throws InterruptedException {
        bossGroup = new NioEventLoopGroup(1);
        workerGroup = new NioEventLoopGroup();
        ServerBootstrap b = new ServerBootstrap();
        b.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .handler(new LoggingHandler(LogLevel.INFO))
                .childHandler(new HttpServerInitializer());
        channel = b.bind(port).sync().channel();
    }

    void close() {
        channel.close();
        bossGroup.shutdownGracefully();
        workerGroup.shutdownGracefully();
    }

    private static class HttpServerInitializer extends ChannelInitializer<SocketChannel> {

        @Override
        public void initChannel(SocketChannel ch) {
            ChannelPipeline p = ch.pipeline();
            p.addLast(new HttpServerCodec());
            p.addLast(new ChunkedWriteHandler());
            p.addLast(new HttpServerHandler());
        }
    }
}