ScriptBot Code

/*
 * Created on 08.11.2005 by jawe
 * $Id$
 */
/*
 * This file is part of scriptbot.
 *
 * scriptbot is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * scriptbot 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 General Public License
 * along with ScriptBot; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package net.jawe.scriptbot;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import net.jawe.scriptbot.factory.Factory;

/**
 * Startup class for the Scriptbot.<br />
 * Maintains a list of bots started throgh this class, that is available to 
 * every bot instance under the 
 * {@link net.jawe.scriptbot.Bot#getFromCache(String, String) cache} 
 * key {@value #BOTS_CACHE_KEY}.
 * 
 * @author jawe
 */
public abstract class Main {

    private static final Log LOG = LogFactory.getLog(Main.class);
    
    private static final Map<String, Bot> bots = new HashMap<String, Bot>();
    
    public static final String BOTS_CACHE_KEY = "_bots";

    /**
     * Starts the bot.
     * @param args
     */
    public static void main(String[] args) {
        try {
            if (args.length == 0) {
                addBot();
            } else {
                for (String arg : args) {
                    if (arg.equals("-h") || arg.equals("--help")) {
                        printHelp();
                        break;
                    } else if (arg.equals("-V") || arg.equals("--version")) {
                        Bot bot = (Bot) Factory.getInstance().getBean("bot");
                        System.out.println(bot.getVersion());
                        break;
                    } else {
                        addBot(arg);
                    }
                }
            }
            startBots();
        } catch (Throwable t) {
            LOG.fatal("Unexpected error", t);
            System.exit(1);
        }
    }
    
    /**
     * Print usage information for the bot's command line invocation.
     */
    public static void printUsage() {
        System.out.println("Usage: java " + Main.class.getName()
                + " [-h] [-V] [ <init-script> [ <init-script> ...] ]");
    }
    
    public static void printHelp() {
        printUsage();
        System.out.println("  <init-script> (Optional) Path of the initial");
        System.out.println("                configuration script. Every script");
        System.out.println("                given starts a new bot.");
        System.out.println("  Options:");
        System.out.println("    -h|--help    Print this help text and exit");
        System.out.println("    -V|--version Print the program version and exit");
    }

    /**
     * Starts the added bots.
     */
    private static void startBots() {
        for (final Map.Entry<String, Bot> e : bots.entrySet()) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Starting bot " + e.getKey());
            }
            if (bots.size() > 1) {
                Thread t = new Thread(e.getValue(), "Startup thread for bot "
                        + e.getKey());
                t.setDaemon(false); // give every startup thread a chance
                t.start();
            } else {
                e.getValue().run();
            }
        }
        if (LOG.isDebugEnabled()) {
            int n = bots.size();
            LOG.debug(n + " bot" + (n != 1 ? "s" : "") + " started");
        }
    }
    
    /**
     * Adds a bot to the list.
     */
    private static void addBot() {
        addBot(null);
    }

    /**
     * Add a bot to the list.
     * @param initScript the initScript to use.
     */
    private static void addBot(String initScript) {
        Bot bot = (Bot) Factory.getInstance().getBean("bot");
        if (initScript != null) {
            bot.getConfig().setInitScriptName(initScript);
        }
        bot.putInCache(null, BOTS_CACHE_KEY, bots);
        bots.put(bot.getConfig().getInitScriptName(), bot);
    }
}