Java tutorial
/** * Copyright (C) 2012 K3RNEL Developer Team * * This file is part of Distro Wars (Server). * * This program 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, either version 3 of the * License, or (at your option) any later version. * * This program 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package net.k3rnel.arena.server; import java.io.File; import java.io.PrintStream; import java.io.PrintWriter; import java.util.Scanner; import net.k3rnel.arena.server.network.TCPManager; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.GnuParser; import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.Options; import org.apache.commons.cli.ParseException; /** * Represents a game server. * * Starting a server requires a parameter to be passed in, i.e. java GameServer -s low -p 500 * Here are the different settings: * -low * < 1.86ghz * < 256MB Ram * < 1mbps Up/Down Connection * 75 Players * -medium * < 2ghz * 512MB - 1GB Ram * 1mbps Up/Down Connection * 200 Players * -high * > 1.86ghz * > 1GB Ram * > 1mbps Up/Down Connection * > 500 Players * * @author shadowkanji * @author Nushio * */ public class GameServer { private static GameServer m_instance; private static ServiceManager m_serviceManager; private static int m_maxPlayers, m_movementThreads; private static String m_dbServer, m_dbName, m_dbUsername, m_dbPassword, m_serverName; private int m_highest; /** * Load pre-existing settings if any * NOTE: It loads the database password if available. * Password is line after serverName */ private void loadSettings() { System.out.println("Loading settings..."); File foo = new File("res/settings.txt"); if (foo.exists()) { try { Scanner s = new Scanner(foo); m_dbServer = s.nextLine(); m_dbName = s.nextLine(); m_dbUsername = s.nextLine(); m_serverName = s.nextLine(); m_dbPassword = s.nextLine(); if (m_dbPassword.isEmpty() || m_dbPassword.equals(" ")) { ConsoleReader r = new ConsoleReader(); System.out.println("Please enter the required information."); System.out.println("Database Password: "); m_dbPassword = r.readToken(); } s.close(); } catch (Exception e) { e.printStackTrace(); } } else { System.out.println("Settings not found."); getConsoleSettings(); } } /** * Asks for Database User/Pass, then asks to save * NOTE: It doesnt save the database password */ private void getConsoleSettings() { ConsoleReader r = new ConsoleReader(); System.out.println("Please enter the required information."); System.out.println("Database Server: "); m_dbServer = r.readToken(); System.out.println("Database Name:"); m_dbName = r.readToken(); System.out.println("Database Username:"); m_dbUsername = r.readToken(); System.out.println("Database Password:"); m_dbPassword = r.readToken(); System.out.println("This server's IP or hostname:"); m_serverName = r.readToken(); System.out.println("Save info? (y/N)"); String answer = r.readToken(); if (answer.contains("y") || answer.contains("Y")) { System.out.println("Save Password in Plaintext? (y/N)"); answer = r.readToken(); if (answer.contains("y") || answer.contains("Y")) saveSettings(true); else saveSettings(false); } System.out.println(); System.err.println("WARNING: When using -nogui, the server should only be shut down using a master client"); } /** * Default constructor */ public GameServer(boolean autorun) { m_instance = this; if (autorun) { loadSettings(); start(); } else { ConsoleReader r = new ConsoleReader(); System.out.println("Load Settings? y/N"); String answer = r.readToken(); if (answer.contains("y") || answer.contains("Y")) { loadSettings(); } else { getConsoleSettings(); } start(); } } /** * Starts the game server */ public void start() { /* * Store locally */ m_serviceManager = new ServiceManager(); m_serviceManager.start(); } /** * Stops the game server */ public void stop() { m_serviceManager.stop(); try { /* Let threads finish up */ Thread.sleep(10000); /* Exit */ System.out.println("Exiting server..."); System.exit(0); } catch (Exception e) { } } /** * Writes server settings to a file */ private void saveSettings(boolean savepass) { try { /* * Write to file */ File f = new File("res/settings.txt"); if (f.exists()) f.delete(); PrintWriter w = new PrintWriter(f); w.println(m_dbServer); w.println(m_dbName); w.println(m_dbUsername); w.println(m_serverName); if (savepass) w.println(m_dbPassword); else w.println(" "); w.flush(); w.close(); } catch (Exception e) { e.printStackTrace(); } } /** * Updates the player count information * @param amount */ public void updatePlayerCount() { int amount = TCPManager.getPlayerCount(); System.out.println(amount + " players online"); if (amount > m_highest) { m_highest = amount; System.out.println("Highest: " + amount); } } /** * Returns the instance of game server * @return */ public static GameServer getInstance() { return m_instance; } /** * If you don't know what this method does, you clearly don't know enough Java to be working on this. * @param args */ public static void main(String[] args) { /* * Pipe errors to a file */ try { PrintStream p = new PrintStream(new File("./errors.txt")); System.setErr(p); } catch (Exception e) { e.printStackTrace(); } /* * Server settings */ Options options = new Options(); options.addOption("s", "settings", true, "Can be low, medium, or high."); options.addOption("p", "players", true, "Sets the max number of players."); options.addOption("ng", "nogui", false, "Starts server in headless mode."); options.addOption("ar", "autorun", false, "Runs without asking a single question."); options.addOption("h", "help", false, "Shows this menu."); if (args.length > 0) { CommandLineParser parser = new GnuParser(); try { // parse the command line arguments CommandLine line = parser.parse(options, args); /* * The following sets the server's settings based on the * computing ability of the server specified by the server owner. */ if (line.hasOption("settings")) { String settings = line.getOptionValue("settings"); if (settings.equalsIgnoreCase("low")) { m_movementThreads = 4; } else if (settings.equalsIgnoreCase("medium")) { m_movementThreads = 8; } else if (settings.equalsIgnoreCase("high")) { m_movementThreads = 12; } else { System.err.println("Server requires a settings parameter"); HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("java GameServer [param] <args>", options); System.exit(0); } } else { System.err.println("Server requires a settings parameter"); HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("java GameServer [param] <args>", options); System.exit(0); } if (line.hasOption("players")) { m_maxPlayers = Integer.parseInt(line.getOptionValue("players")); if (m_maxPlayers == 0 || m_maxPlayers == -1) m_maxPlayers = 99999; } else { System.err.println("WARNING: No maximum player count provided. Will default to 500 players."); m_maxPlayers = 500; } if (line.hasOption("help")) { HelpFormatter formatter = new HelpFormatter(); System.err.println("Server requires a settings parameter"); formatter.printHelp("java GameServer [param] <args>", options); } /* * Create the server gui */ @SuppressWarnings("unused") GameServer gs; if (line.hasOption("nogui")) { if (line.hasOption("autorun")) gs = new GameServer(true); else gs = new GameServer(false); } else { if (line.hasOption("autorun")) System.out.println("autorun doesn't work with GUI"); gs = new GameServer(false); } } catch (ParseException exp) { // oops, something went wrong System.err.println("Parsing failed. Reason: " + exp.getMessage()); // automatically generate the help statement HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("java GameServer [param] <args>", options); } } else { // automatically generate the help statement HelpFormatter formatter = new HelpFormatter(); System.err.println("Server requires a settings parameter"); formatter.printHelp("java GameServer [param] <args>", options); } } /** * Returns the service manager of the server * @return */ public static ServiceManager getServiceManager() { return m_serviceManager; } /** * Returns the amount of players this server will allow * @return */ public static int getMaxPlayers() { return m_maxPlayers; } /** * Returns the amount of movement threads running in this server * @return */ public static int getMovementThreadAmount() { return m_movementThreads; } /** * Returns the database host * @return */ public static String getDatabaseHost() { return m_dbServer; } /** * Returns the database username * @return */ public static String getDatabaseUsername() { return m_dbUsername; } /** * Returns the database password * @return */ public static String getDatabasePassword() { return m_dbPassword; } /** * Returns the name of this server * @return */ public static String getServerName() { return m_serverName; } /** * Returns the database selected * @return */ public static String getDatabaseName() { return m_dbName; } }