net.anyflow.lannister.server.MqttServer.java Source code

Introduction

Here is the source code for net.anyflow.lannister.server.MqttServer.java

Source

/*
 * Copyright 2016 The Lannister Project
 * 
 * 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 net.anyflow.lannister.server;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.concurrent.DefaultThreadFactory;
import net.anyflow.lannister.Settings;

public class MqttServer {
    private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MqttServer.class);

    private final EventLoopGroup bossGroup;
    private final EventLoopGroup workerGroup;

    public MqttServer() {
        bossGroup = new NioEventLoopGroup(Settings.SELF.getInt("lannister.system.bossThreadCount", 0),
                new DefaultThreadFactory("lannister/boss"));
        workerGroup = new NioEventLoopGroup(Settings.SELF.getInt("lannister.system.workerThreadCount", 0),
                new DefaultThreadFactory("lannister/worker"));
    }

    public void start() throws Exception {
        if (Settings.SELF.mqttPort() == null && Settings.SELF.mqttsPort() == null
                && Settings.SELF.websocketPort() == null && Settings.SELF.websocketSslPort() == null) {
            logger.info("No MQTT port(s) arranged");
            shutdown();
            return;
        }

        try {
            ScheduledExecutor scheduledExecutor = new ScheduledExecutor();

            if (Settings.SELF.mqttPort() != null) {
                executeBootstrap(scheduledExecutor, Settings.SELF.mqttPort(), false, false);
                scheduledExecutor = null;
            }
            if (Settings.SELF.mqttsPort() != null) {
                executeBootstrap(scheduledExecutor, Settings.SELF.mqttsPort(), false, true);
                scheduledExecutor = null;
            }
            if (Settings.SELF.websocketPort() != null) {
                executeBootstrap(scheduledExecutor, Settings.SELF.websocketPort(), true, false);
                scheduledExecutor = null;
            }
            if (Settings.SELF.websocketSslPort() != null) {
                executeBootstrap(scheduledExecutor, Settings.SELF.websocketSslPort(), true, true);
                scheduledExecutor = null;
            }

            logger.info(
                    "Lannister server started: [MQTT tcp.port={}, tcp.ssl.port={}, websocket.port={}, websocket.ssl.port={}]",
                    Settings.SELF.mqttPort(), Settings.SELF.mqttsPort(), Settings.SELF.websocketPort(),
                    Settings.SELF.websocketSslPort());
        } catch (Exception e) {
            logger.error("Lannister failed to start", e);

            shutdown();

            throw e;
        }
    }

    private void executeBootstrap(ScheduledExecutor scheduledExecutor, int port, boolean useWebSocket,
            boolean useSsl) throws InterruptedException {
        ServerBootstrap bootstrap = new ServerBootstrap();

        bootstrap = bootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class);

        if (scheduledExecutor != null) {
            bootstrap.handler(scheduledExecutor);
        }

        bootstrap.childHandler(new MqttChannelInitializer(useWebSocket, useSsl));
        bootstrap.bind(port).sync();
    }

    public void shutdown() {
        if (bossGroup != null) {
            bossGroup.shutdownGracefully().awaitUninterruptibly();
            logger.info("Boss event loop group shutdowned");
        }

        if (workerGroup != null) {
            workerGroup.shutdownGracefully().awaitUninterruptibly();
            logger.info("Worker event loop group shutdowned");
        }

        logger.info("Lannister server shutdowned");
    }
}