io.riox.springxd.sinks.websocket.NettyWebSocketServer.java Source code

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Here is the source code for io.riox.springxd.sinks.websocket.NettyWebSocketServer.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 io.riox.springxd.sinks.websocket;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.util.SelfSignedCertificate;

import java.security.cert.CertificateException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.PreDestroy;
import javax.net.ssl.SSLException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * simple websocket server implementation based on netty
 * inspired by the netty websocket server example
 *
 * @see <a href="https://github.com/netty/netty/tree/master/example/src/main/java/io/netty/example/http/websocketx/server">netty websocket server example</a>
 *
 * @author omoser
 * @author whummer
 */
public class NettyWebSocketServer {

    public static final int DEFAULT_PORT = 9292;

    static final Logger log = LoggerFactory.getLogger(NettyWebSocketServer.class);

    public static final int BOSS_GROUP_THREADS = 1;

    NettyWebSocketServerInitializer nettyWebSocketServerInitializer;

    EventLoopGroup bossGroup = new NioEventLoopGroup(BOSS_GROUP_THREADS);

    EventLoopGroup workerGroup = new NioEventLoopGroup();

    boolean ssl;

    int port = DEFAULT_PORT;

    // for cmdline testing
    public static void main(String[] args) throws Exception {
        new NettyWebSocketServer().run();
    }

    public NettyWebSocketServer() {
    }

    public NettyWebSocketServer(int port) {
        this.port = port;
    }

    @SuppressWarnings("unchecked")
    static synchronized Map<String, List<Channel>> getPathsToChannels() {
        String key = "__NETTY_WEBSOCKET_PATHS_TO_CHANNELS__";
        Map<String, List<Channel>> map = (Map<String, List<Channel>>) System.getProperties().get(key);
        if (map == null) {
            map = Collections.synchronizedMap(new HashMap<String, List<Channel>>());
            System.getProperties().put(key, map);
        }
        return map;
    }

    public void run() throws SSLException, CertificateException, InterruptedException {
        // Configure SSL.
        final SslContext sslCtx;
        if (ssl) {
            SelfSignedCertificate ssc = new SelfSignedCertificate();
            sslCtx = SslContext.newServerContext(ssc.certificate(), ssc.privateKey());
        } else {
            sslCtx = null;
        }

        new ServerBootstrap().group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                .handler(new LoggingHandler(LogLevel.INFO))
                .childHandler(new NettyWebSocketServerInitializer(sslCtx)).bind(port).sync().channel();

        log.info("************************************************");
        log.info("Started netty websocket server on port {}", port);
        log.info("************************************************");
    }

    @PreDestroy
    public void shutdown() {
        bossGroup.shutdownGracefully();
        workerGroup.shutdownGracefully();
    }
}