aphelion.server.ServerDaemon.java Source code

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Here is the source code for aphelion.server.ServerDaemon.java

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/*
 * Aphelion
 * Copyright (c) 2013  Joris van der Wel
 * 
 * This file is part of Aphelion
 * 
 * Aphelion is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, version 3 of the License.
 * 
 * Aphelion is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with Aphelion.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * In addition, the following supplemental terms apply, based on section 7 of
 * the GNU Affero General Public License (version 3):
 * a) Preservation of all legal notices and author attributions
 * b) Prohibition of misrepresentation of the origin of this material, and
 * modified versions are required to be marked in reasonable ways as
 * different from the original version (for example by appending a copyright notice).
 * 
 * Linking this library statically or dynamically with other modules is making a
 * combined work based on this library. Thus, the terms and conditions of the
 * GNU Affero General Public License cover the whole combination.
 * 
 * As a special exception, the copyright holders of this library give you 
 * permission to link this library with independent modules to produce an 
 * executable, regardless of the license terms of these independent modules,
 * and to copy and distribute the resulting executable under terms of your 
 * choice, provided that you also meet, for each linked independent module,
 * the terms and conditions of the license of that module. An independent
 * module is a module which is not derived from or based on this library.
 */

package aphelion.server;

import aphelion.server.http.HttpServer;
import aphelion.shared.event.Deadlock;
import aphelion.shared.event.TickedEventLoop;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.apache.commons.daemon.DaemonInitException;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.SafeConstructor;

/**
 *
 * @author Joris
 */
public class ServerDaemon implements Daemon {
    private static final Logger log = Logger.getLogger("aphelion.daemon");

    private static final int EX_SOFTWARE = 70; //  sysexits.h

    private ServerSocketChannel ssChannel;
    private AphelionServerThread serverThread;
    private Thread main;

    private Map<String, Object> config;

    @Override
    public void init(DaemonContext dc) throws DaemonInitException, Exception {
        // At this point we are running as root
        // Do priviliged stuff like opening a socket port < 1024

        String[] args = dc.getArguments();

        if (args.length < 1) {
            throw new IllegalArgumentException("The first argument should be the path to a yaml config file");
        }

        Yaml yaml = new Yaml(new SafeConstructor());
        // might throw IOException, ClassCastException, etc
        this.config = (Map<String, Object>) yaml.load(new FileInputStream(args[0]));

        String address = config.containsKey("bind-address") ? (String) config.get("bind-address") : "0.0.0.0";
        int port = config.containsKey("bind-port") ? (int) config.get("bind-port") : 80;

        InetSocketAddress listen = new InetSocketAddress(address, port);
        this.ssChannel = HttpServer.openServerChannel(listen);

        Deadlock.start(false, new Deadlock.DeadlockListener() {
            @Override
            public boolean deadlockDetected(TickedEventLoop eventLoop, Thread thread) {
                return true; // force stop of the offending thread
            }

            @Override
            public void deadlockAfterStop(TickedEventLoop eventLoop, Thread thread) {
                log.log(Level.INFO, "Exit");
                System.exit(EX_SOFTWARE);
            }
        });
    }

    @Override
    public void start() throws Exception {
        // No longer super user
        // This method must return after starting threads
        main = Thread.currentThread();

        log.log(Level.INFO, "Deamon start (thread {0})", Thread.currentThread().getName());

        serverThread = new AphelionServerThread(false, this.ssChannel, this.config);
        serverThread.setDaemon(true);
        serverThread.setFailureListener(new AphelionServerThread.FailureListener() {
            @Override
            public void serverThreadFailure(Throwable ex) {
                log.log(Level.INFO, "Exit");
                System.exit(EX_SOFTWARE);
            }
        });
        serverThread.start();
    }

    @Override
    public void stop() throws Exception {
        log.log(Level.INFO, "Deamon stop", Thread.currentThread().getName());
        serverThread.stopServer();
    }

    @Override
    public void destroy() {
        // start and stop may be called any number of times, but destroy only once
        // do stuff like freeing sockets here

        Deadlock.stop();

        try {
            ssChannel.close();
        } catch (IOException ex) {
            log.log(Level.SEVERE, null, ex);
        }
    }

}