001 /**
002 * Jetrix TetriNET Server
003 * Copyright (C) 2005 Emmanuel Bourg
004 *
005 * This program is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU General Public License
007 * as published by the Free Software Foundation; either version 2
008 * of the License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
013 * GNU General Public License for more details.
014 *
015 * You should have received a copy of the GNU General Public License
016 * along with this program; if not, write to the Free Software
017 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
018 */
019
020 package net.jetrix.services;
021
022 import java.awt.TrayIcon;
023 import java.io.BufferedReader;
024 import java.io.IOException;
025 import java.io.InputStreamReader;
026 import java.net.HttpURLConnection;
027 import java.net.URL;
028 import java.util.logging.Level;
029
030 import net.jetrix.SystrayManager;
031 import net.jetrix.config.ServerConfig;
032
033 /**
034 * Service checking the availability of a new release.
035 *
036 * @since 0.2
037 *
038 * @author Emmanuel Bourg
039 * @version $Revision: 794 $, $Date: 2009-02-17 20:08:39 +0100 (Tue, 17 Feb 2009) $
040 */
041 public class VersionService extends CronService
042 {
043 /** The latest stable version known. */
044 private static String latestVersion;
045
046 public VersionService()
047 {
048 // default frequency : once a day
049 setPattern("0 0 * * * *");
050 }
051
052 public String getName()
053 {
054 return "Version Checker";
055 }
056
057 protected void run()
058 {
059 updateLatestVersion();
060
061 if (isNewVersionAvailable())
062 {
063 String message = "A new version is available (" + VersionService.getLatestVersion() + "), download it on http://jetrix.sf.net now!";
064 log.warning(message);
065 SystrayManager.notify(message, TrayIcon.MessageType.INFO);
066 }
067 }
068
069 /**
070 * Return the version of the latest release. The version of the last stable
071 * release is stored on the Jetrix site (http://jetrix.sf.net/version.php),
072 * this file is build dynamically everyday and reuse the version specified
073 * in the project.properties file.
074 */
075 private static String fetchLatestVersion()
076 {
077 String version = null;
078
079 try
080 {
081 URL url = new URL("http://jetrix.sourceforge.net/version.php");
082
083 HttpURLConnection conn = null;
084 try
085 {
086 conn = (HttpURLConnection) url.openConnection();
087
088 // read the first line of the file
089 BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
090 version = in.readLine();
091 }
092 finally
093 {
094 conn.disconnect();
095 }
096 }
097 catch (IOException e)
098 {
099 log.log(Level.WARNING, "Unable to check the availability of a new version", e);
100 }
101
102 return version;
103 }
104
105 /**
106 * Update the latest stable version known.
107 */
108 public static void updateLatestVersion()
109 {
110 latestVersion = fetchLatestVersion();
111 }
112
113 /**
114 * Return the latest stable version known.
115 */
116 public static String getLatestVersion()
117 {
118 return latestVersion;
119 }
120
121 /**
122 * Check if the latest stable version is more recent than the current version.
123 */
124 public static boolean isNewVersionAvailable()
125 {
126 return latestVersion != null && ServerConfig.VERSION.compareTo(latestVersion) < 0;
127 }
128 }