org.jooby.Netty.java Source code

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Here is the source code for org.jooby.Netty.java

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/*
 * Copyright 2012 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 org.jooby;

import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_LENGTH;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;

import java.nio.charset.StandardCharsets;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpHeaders.Values;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpServerCodec;

/**
 * An HTTP server that sends back the content of the received HTTP request
 * in a pretty plaintext form.
 */
public final class Netty {

    static final int PORT = 8080;

    public static void main(final String[] args) throws Exception {

        // Configure the server.
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.option(ChannelOption.SO_BACKLOG, 1024);
            b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                    //.handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<Channel>() {
                        @Override
                        protected void initChannel(final Channel ch) throws Exception {
                            ChannelPipeline p = ch.pipeline();
                            p.addLast(new HttpServerCodec());
                            p.addLast(handler());
                        }
                    });

            Channel ch = b.bind(PORT).sync().channel();

            System.err.println("Open your web browser and navigate to http://127.0.0.1:" + PORT + '/');

            ch.closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

    protected static ChannelHandler handler() {
        byte[] helloWorld = "Hello World".getBytes(StandardCharsets.UTF_8);
        return new ChannelInboundHandlerAdapter() {
            @Override
            public void channelReadComplete(final ChannelHandlerContext ctx) {
                ctx.flush();
            }

            @Override
            public void channelRead(final ChannelHandlerContext ctx, final Object msg) {
                if (msg instanceof HttpRequest) {
                    HttpRequest req = (HttpRequest) msg;

                    if (HttpHeaders.is100ContinueExpected(req)) {
                        ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE));
                    }
                    boolean keepAlive = HttpHeaders.isKeepAlive(req);
                    FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK,
                            Unpooled.wrappedBuffer(helloWorld));
                    response.headers().set(CONTENT_TYPE, "text/plain");
                    response.headers().set(CONTENT_LENGTH, response.content().readableBytes());

                    if (!keepAlive) {
                        ctx.write(response).addListener(ChannelFutureListener.CLOSE);
                    } else {
                        response.headers().set(CONNECTION, Values.KEEP_ALIVE);
                        ctx.write(response);
                    }
                }

            }

            @Override
            public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
                cause.printStackTrace();
                ctx.close();
            }
        };
    }
}